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HomeMy WebLinkAboutWPO201300032 Plan - Stormwater 2014-07-24 Cascadia Blocks 4-7 Albemarle County, Virginia aru Stormwater Pollution Prevention Plan (SWPPP) And Pollution Prevention Plan (PPP) a�. In compliance with: Storm Water Construction General Permit No. VAR10 Virginia Stormwater Management Program (VSMP) a Owner/Developer: Cascadia Development LLC 170 South Pantops Drive Charlottesville, VA 22903 ,t• T.i• G Prepared By: •Dominion Engineering 0 4,172 South Pantops Drive t MIC`a No.33028 S ♦ s / ic. Charlottesville, VA 22911 � Construction Activity Operator ��' SSIONAL:) 4 44+;CEVA Contractors ATTN: Charlie Hurt 195 Riverbend Drive Charlottesville, VA 22911 434-979-8181 ao July 24, 2014 w Signature: e4,14,,,, y • Date:72A-I4- [Authorized Representative per Part III K 1 of the Permit, Appendix A] Name: Chc4Clt W. (44 -� Title: ?re i Firm: (RYA 6 rccc6w5 a` Cascadia Blocks 4 - 7 Stormwater Pollution Prevention Plan and Pollution Prevention Plan `" TABLE OF CONTENTS . I. Introduction A) Plan Purpose .. B) Background - Construction General Permit No. VAR10 II. Plan Requirements . A) General Requirements 1) Deadlines . 2) Incorporation of Other Plans 3) Plan Administration 4) Plan Updates r- 5) Potential Construction Site Stormwater Pollutants B) Specific Requirements—Erosion and Sediment Control and Stormwater . Management 1) Site Description 2) Controls and Measures III. Pollution Prevention Plan r' A) Potential Sources of Pollution B) Materials Handling and Waste Management—Best Management Practices C) Spill Response, Maintenance and Inspection — D) Non-Stormwater Discharges E) Pollution Prevention Awareness . References Appendix A General Permit for Discharges of Stormwater from Construction Activities (DCR01) Appendix B Forms;Notice of Registration and Notice of Termination Appendix C Record of Land Disturbance Appendix D Record of Inspections Appendix E Authorized Representative Letter to DCR Appendix F Erosion and Sediment Control Narrative Appendix G Stormwater Management Narrative Operator(s): CEVA Contractors Charlie Hurt 195 Riverbend Drive Charlottesville,VA 434-979-8181 cahbuild @ntelos.net Contractors/Subcontractor(s): Linco, Inc. Guy Wright 434-981-3050 Insert Company or Organization Name: Insert Name: Insert Telephone Number: Insert Company or Organization Name: Insert Name: Insert Telephone Number: I Introduction A) Plan Purpose This Storm Water Pollution Prevention Plan and Pollution Prevention Plan(Plan) has been developed as a requirement of the Virginia Stormwater Management Program (VSMP) General Permit for Discharges of Storm Water from Construction Activities (Permit), as defined in 9 VAC 25-180-10 et seq. The purpose of this Plan is to: �• Identify potential sources of pollution that may reasonably be expected to affect the quality of storm water discharges from the construction site, and, W To describe and ensure the implementation of practices that will be used to reduce pollutants in storm water discharges from the construction site and to assure compliance with the conditions of the Permit. Implementation of the components of this Plan is required as a condition of the Permit (Appendix A). The Department of Environmental Quality (Department) has been granted authority to administer the VPDES program and is therefore the regulatory authority overseeing the implementation of this Plan. B) Background- Construction General Permit No. VAR10 W The Permit has a fixed term of 5 years from the effective date of July 1, 2014, and is required for all projects that will disturb 1 or more acres of total land area. To obtain a Permit, operators must submit a Registration Statement(Appendix B) prior to the commencement of construction activities (clearing, grading, or other activities that result in soil disturbance). The Permit authorizes the discharge of storm water from construction activities until the Permit's expiration date. The Permit also authorizes the discharge of storm water from offsite support activities, provided that certain conditions are met as outlined in the Permit(Part I A. 2.). Certain non-storm water discharges are also authorized by the Permit, provided the conditions ... contained in the Permit (Part I D. 2.) are met. Upon final stabilization of the site, a Notice of Termination (Appendix B) must be submitted to the Department. Coverage under the Permit will be deemed terminated 2 days after submittal of the Notice of Termination. II Plan Requirements A) General Requirements 1) Deadlines The Plan shall be prepared prior to the submittal of the Registration Statement and shall provide for compliance with the terms and schedule of the Permit beginning with the initiation of construction activities. 2) Incorporation of Other Plans The Plan requirements of the Permit are satisfied by incorporating by reference other plans developed for this construction activity. The construction plans developed for this project, Final Subdivision Plan for Cascadia Blocks 4-7 in Albemarle County, Virginia meet current Albemarle County requirements regarding erosion and sediment control and storm water management, and also comply with State regulatory requirements as presented in the Virginia Erosion and Sediment Control Handbook, Third Edition. All plans incorporated by reference into the Plan are enforceable under the Permit. 3) Plan Administration The Plan shall be certified in accordance with the Permit. Copies of the Plan shall be kept on-site and be made available to the Department, or other regulatory agencies having authority, upon request. The Plan must also be available to all operators identified as having responsibilities to carry out provisions contained in the Plan. 4) Plan Updates The Plan shall be amended whenever there is a change in design, construction, operation, or maintenance of the construction site that has a significant effect on the potential for the discharge of pollutants to surface waters and that has not been addressed in the normal implementation of the Plan. The Plan shall also be updated whenever it is found to be ineffective in meeting the requirements of the Permit. In the event the Department notifies the permittee that the Plan does not meet one or more of the provisions of the Permit, within a period of 7 days the permittee must make the required changes to the Plan and submit a certification to the Department stating that the required changes have been made. B) Specific Requirements—Erosion and Sediment Control and Stormwater Management 1) Site Description a The items required by the Permit regarding the site description (Part II D.1., Appendix A) can be found in the project design plans,Early Grading Plan for Cascadia Blocks .. 4— 7 and Final Erosion & Control and Stormwater Management Plan for Cascadia Blocks 4- 7, which are incorporated by reference into this Plan. A summary of the required elements is provided in Table 2, with a reference to the sheet number in the design plans where the required element can be located: Table 2. Site Description Elements a Please refer to the referenced location in the Early Grading Plan for Cascadia Blocks 4 - 7 (EGP) and Final Erosion and Sediment Control and Stormwater Management Plan for Cascadia Blocks 4 - 7 (FSWM) Permit Location' a Part 11 D. Required Element 1.... a. Description of construction activity APP. F b. Description of construction sequence of soil disturbing activities (EGP)SW6,SW 11 c. Site area estimates, including limits of soil disturbance (EGP)SW5 Fd. Pre and post-construction runoff coefficients APP.G e. Existing vegetation at the site (EGP)SW5 f. Description of other potential pollution sources, including vehicle fueling, SWPPP, PAGE 5 chemical storage areas, sanitary waste facilities,construction debris,litter,etc. g. Receiving water names,including the ultimate receiving water,and the areal Unnamed Tributary to extent of wetlands Rivanna River h. Site map,to include locations of the following: h.(1) -Drainage patterns,pre and post-construction (FSWM)SW17,SW18 h.(2) -Limits of clearing (EGP)SW5 h.(3) -Major structural and non-structural controls (EGP)SW10 h.(4) -Stabilization areas,including types of vegetative cover (FSWM)SW6-SW9 h.(5) -Surface waters, including wetlands (EGP)SW5 h.(6) -Storm water discharge points,with an outline of the associated APP.G,(FSWM)SW 17 drainage areas yr. (FSWM)SW3,SW5 h.(7) -Existing and planned:buildings,paved areas (FSWM)SW18 h.(8) -Permanent storm water management facilities h.(9) -Offsite material,waste,borrow,or equipment areas covered by the NA Plan SWPPP,PAGE 5 h.(10) -Other potential pollution sources(as described in f. above) i, Description of support activities covered by the Permit, including any dedicated N/A concrete and asphalt plants - 1'Attach to this Plan any required elements that are not found in the design plans.) S 2) Controls and Measures The Permit requires the implementation of various types of controls and measures that are implemented to control pollutants in storm water discharges from the project site. The Permit specifically requires the implementation of erosion and sediment control practices (both structural and non-structural),All E & Sand SWM/BMP controls , and specific other controls to reduce pollutants. employed in this project were selected to meet and/or exceed State and local requirements and are detailed in the referenced design plans. Several requirements of the Permit relating to controls (Part II.D.2., Appendix A) are not included in the referenced design plans. A description of all the required items (including E&S and SWM/BMP) is presented below, along with how they are addressed in this Plan: a) Erosion and Sediment Control .. The Erosion and Sediment Control Plans for Cascadia Blocks 4 - 7 contain detailed information regarding erosion and sediment controls used in this project. Specifically E & S control measures can be found on Sheet SW5 of the plans and in Appendix F. b) SWM/BMP's The Final Erosion and Sediment& Stormwater Management Plan for Cascadia Blocks 4 - 7 contains detailed information regarding SWM/BMP controls used in this project. Specifically Stormwater Management Control Measures can be found on Sheets SW14 and SW15. III. Pollution Prevention Plan A) Potential Sources of Pollution ,. Potential sources of sediment to stormwater runoff: • Clearing and grubbing operations • Grading and site excavation operations • Vehicle tracking • Topsoil stripping and stockpiling • Landscaping operations Potential pollutants and sources, other than sediment, to stormwater runoff: • Staging Area—small fueling activities,minor equipment maintenance, sanitary facilities, and hazardous waste storage. avin • Materials Storage Area—general building materials, solvents, adhesives, paving materials,paints, aggregates,trash, etc. • Construction Activity—paving, curb/gutter installation, concrete pouring/mortar/stucco, and building construction • Concrete Washout Area For all potential construction site pollutants, see Table 1 below. Table 1 a a a a rr a a Potential Construction Site Storm Water Pollutants Material/Chemical Physical Description Stormwater Pollutants Location` Pesticides(insecticides. Various colored to Chlorinated hydrocarbons, Herbicides used for noxious fungicides.herbicides. colorless liquid. organophosphates. weed control rodenticides) powder.pellets,or carbamates.arsenic Strains Fertilizer Liquid or solid grains Nitrogen.phosphorous Newly seeded areas ... Plaster White granules or Calcium sulphate.calcium Home construction powder carbonate,sulfuric acid Cleaning solvents Colorless.blue.or Perchloroethylene. No equipment cleaning yellow-green liquid methylene chloride. allowed in project limits ""' trichloroethylene.petroleum distillates Asphalt Black solid Oil.petroleum distillates Streets and roofing Concrete White solid`grey liquid Limestone.sand.pH. Curb and gutter.building chromium construction Glue.adhesives White or yellow liquid Polymers.epoxies Home construction Paints Various colored liquid Metal oxides.stoddard Home construction solvent,talc.calcium carbonate.arsenic Curing compounds Creamy white liquid Naphtha Curb and gutter Wood preservatives Clear amber or dark Stoddard solvent.petroleum Timber pads and Home brown liquid distillates.arsenic.copper. construction chromium Hydraulic oil:fluids Brown oily petroleum Mineral oil Leaks or broken hoses from hydrocarbon equipment Gasoline Colorless.pale brown Benzene.ethyl benzene. Secondary or pink petroleum toluene.xylene.MTBE containment'staging area hydrocarbon Diesel Fuel Clear.blue-green to Petroleum distillate.oil& Secondary yellow liquid grease.naphthalene.xylenes containment staging area VOW Kerosene Pale yellow liquid Coal oil.petroleum Secondary petroleum hydrocarbon distillates contaimment'staging area rr IMO a a .. Table 1, Continued M feria lChemical Physical Description Stormwater Pollutants Location* Antifreeze!coolant Clear green/yellow Ethylene glycol.propylene Leaks or broken hoses from liquid glycol.heavy metals equipment (copper.lead.zinc) Sanitary toilets Various colored liquid Bacteria.parasites.and Staging area vimses *Area where matenalthertucal is used on-sitel B. Material Handling and Waste Management—Best Management Practices 1) Fuels and Oils (a) On-site vehicle refueling will be conducted in a dedicated location away from access to surface waters. Since the location of fueling activities will periodically move during construction,the design plans do not contain a Vag specific location. For each phase of work a location will be determined in the field and noted in the Site Inspection Log (Appendix B). Containment berms will be located adjacent to the refueling area that will contain any inadvertent spills until they can be cleaned up. Any on-site storage tanks will have a means of secondary containment. In the event of a spill, it will be cleaned up VINO immediately and the material, including any contaminated soil, will be disposed of according to all federal, state, and local regulations. �,. (b) Several types of vehicles and equipment will be used on site throughout the project; including graders, scrapers, excavators, loaders, paving equipment, rollers, trucks and trailers, backhoes, and forklifts. All major equipment/vehicle feeling in maintenance will be performed offsite. A small, 20 gallon pick up bed fuel tank will be kept on site in the designated fueling area. When vehicle feeling must occur on site, the feeling activity will occur in the designated area. �. Only minor equipment maintenance will occur on site. All equipment fluids generated from maintenance activities will be disposed of into designated drums stored on spill pallets. Absorbent, spill cleanup materials and spill kits will be available at the contractor's construction trailer. Drip pans will be placed under all equipment receiving maintenance and vehicles and equipment parked overnight. a (c) All vehicles on site will be monitored for leaks and receive regular preventive maintenance to reduce the chance of leakage. a (d) Petroleum products will be stored in tightly sealed containers which are clearly labeled. (e) Spill kits will be included with all fueling sources and maintenance activities and will be located next to the contractor's construction trailer. a a (f) Any asphalt substances used onsite will be applied according to the manufacturer's recommendation. AMP 2) Solid Waste All waste materials will be collected and disposed of into two metal trash dumpsters in the staging area. Dumpsters will have a secure watertight lid, be placed away from stormwater conveyances and drains, and meet all local and state solid-waste management regulations. Only trash and construction debris from the site will be deposited in the dumpsters. All personnel will be instructed, during tailgate training sessions, regarding the correct procedure for disposal of trash and construction debris. Notices that state these practices will be posted in the office trailer and the individual who manages day-to-day site operations will be responsible for seeing that these practices are followed 3) Fertilizer (a) Fertilizers will be applied only in the minimum amounts recommenced by the manufacturer. (b) Fertilizers will be worked into the soil to limit exposure to storm water. (c) Fertilizers will be stored in a covered shed and partially used bags will be transferred to a sealable bin to avoid spills. 4) Hazardous Waste to include oil filters, petroleum products, paint and equipment maintenance fluids (a) Hazardous Waste to include oil filters, petroleum products, paint and equipment maintenance fluids will be stored in structurally sound and sealed shipping containers in the hazardous materials storage area and segregated from other non-waste materials. Secondary containment will be provided for all materials in the hazardous materials storage area and will consist of commercially available spill pallets. Additionally, all hazardous materials will be disposed of in accordance with federal, state, and municipal regulations. Hazardous waste materials will not be disposed of in to the on- -- site dumpsters. All personnel will be instructed, during tailgate training sessions, regarding proper procedures for hazardous waste disposal. Notices that state these procedures will be posted in the office trailer and the individual who manages the day-to-day site operations will be responsible for seeing that these procedures are followed. (b) Spray guns will be cleaned on a removable tarp or baby pool. (c) Chemicals used on-site are to be kept in small quantities and stored in closed a" containers undercover and kept out of direct contact with storm water. As with fuels and oils, any inadvertent spills will be cleaned up immediately and disposed of according to federal, state, and local regulations. 5) Concrete (a) Concrete trucks will not be allowed to wash out or discharge surplus concrete or drum wash water on the site, except in a specially designated concrete disposal area. (b) Designated temporary, below-ground concrete washout areas will be constructed in locations as appropriate and as determined by the Construction Activity Operator. The temporary below ground containment will be constructed as shown below, with a minimum length and width of 10 feet, but with sufficient quantity and volume to contain all liquid and concrete waste generated by the washout operations. The washout areas will be lined with plastic sheeting at least 10 mils thick and free of any holes or tears. Signs will be posted marking the location of the washout area to ensure that concrete equipment operators use the proper facility. (c) Form release oil used for decorative stone work will be applied over a pallet covered with an absorbent material to collect excess fluid. The absorbent material will be replaced and disposed of properly when saturated. TEMPORARY CONCRETE WASHOUT AREA AND SIGNAGE DETAILS wax 10 ml PLASTIC LNNG • �, Vv // 1m BERM t I n 1EL - 11111111/- _ 1 CA EL • a FLYNWO 1200mmx610mm PAINTED WHITE :IGOFKYETE;i BLACK LUIERS WASHOUT HEW , LAG f9'5mmI� (12.5 rnm) WOOD POS' 915 men I (69mntx89mnx2.4m) a CONCRETE WASHOUT SIGN DETAIL (OR EWUIVALENI) a 6) Water Testing a When testing/cleaning of water supply lines, the discharge from the tested pipe will be collected and conveyed to a completed storm water pipe system for �• ultimate discharge into a sedimentation basin or SWM/BMP facility. 7) Sanitary Waste Portable lavatories are located on-site and are serviced on a regular basis by a contractor. They will be located in upland areas away from direct contact with surface waters. Any spills occurring during servicing will be cleaned up immediately, including any contaminated soils, and disposed of according to all federal, state, and local regulations. a 8) Grading and E & S Activities A record of the dates when major grading activities occur, when construction activities temporarily or permanently cease on a portion of the site, and when stabilization measures are initiated shall be maintained and included in Appendix a of this Plan. 9) Wash water Wash water from proposed construction entrance is to be directed to nearest sediment basin as shown on the approved erosion and sediment control plan. 10)Minimization of Exposure to Precipitation and Storm Events In the event that precipitation is predicted onsite, construction activity operator to ensure that all building materials, building products, construction wastes, trash, landscape materials, fertilizers, pesticides, detergents, sanitary waste, and other a materials present onsite is protected from the runoff by the use of covering tarps that are securely fastened to eliminate blowoff. C) Spill Response, Maintenance and Inspections aar 1) Spills Oil, chemical or other hazardous substance spills in excess of reportable quantities, in accordance with Part I E. of the Permit (Appendix A), will be reported to the Department in accordance with Part III G. of the Permit as soon as the discharge is discovered, but no later than 24 hours. A reportable quantity of oil is defined as a discharge to a surface water that causes a sheen, discoloration, and/or an emulsion. Reports will be made to the following: DEQ Valley Regional Office Phone: (540) 574-7800 Fax: (540) 574-7878 For reports outside normal working hours, leave a message. Virginia Department of Emergency Management Emergency Operations Center (EOC) Phone: 1-(800) 468-8892 Materials and equipment necessary for oil or chemical spill cleanup will be kept in the temporary material storage trailer onsite. Equipment will include, but not be limited to, brooms, dust pans, mops, rags, gloves, goggles, kitty litter, sand, saw dust, and plastic and metal trash containers. All oil or other chemical spills will be cleaned up immediately upon discovery. Spills large enough to reach the storm sewers will be reported to the National Response Center at 1-800-424-8802. a 2) Maintenance Maintenance of the erosion and sediment controls and the storm water management/BMP facilities incorporated into this project must be maintained on a regular basis to assure their continued effectiveness. This includes repairs to all erosion and sediment controls at the required intervals. Those controls found to be ineffective during routine inspections (as described in the following section) shall be repaired before the next anticipated storm event or as soon as practicable. A more detailed description of the maintenance procedures is contained in the Erosion and Sediment Control Plans for Cascadia, and is incorporated in this Plan by reference. 3) Inspections a a Regular inspections of the construction site shall be performed by"Qualified personnel", defined as a licensed professional engineer, responsible land disturber (RLD), or other knowledgeable person who (i) holds a certificate of competence from the board in the area of project inspection; or(ii) is enrolled in the board's training program for project inspection or combined administrator and successfully completes such program within one year of enrollment. Inspections shall include the review of all disturbed areas, structural and non-structural control measures, material storage areas, and vehicular access points. Inspections are to be performed at least once every 14 calendar days and within 48 hours after a runoff producing storm event. Areas that already have been stabilized or where runoff is unlikely due to frozen or snow covered ground shall be inspected at least on a monthly basis. Areas that have been permanently stabilized can be delineated in the Plan, thus removing the inspection requirements for those areas. Inspections are intended to identify areas where the pollutant control measures at the site are ineffective and are allowing pollutants to enter surface waters. Receiving waters shall be inspected to ascertain whether control measures are effective in preventing significant impacts. Locations where vehicles enter or exit the site shall be inspected for evidence of offsite sediment tracking. If as a result of the inspection, the site conditions and/or control measures are found to have changed, the Plan shall be updated within a period of 7 calendar days. If control measures need to be modified to assure effectiveness or if additional measures are determined to be necessary, implementation shall be completed prior to the next anticipated storm event or as soon as practicable. A report summarizing the inspections and the subsequent maintenance activities must be completed and maintained as part of the Plan. The inspection forms are included in Appendix D. Required elements include major observations (including information on control measure performance and incidents of non-compliance), and information on the inspecting personnel. If an inspection does not identify any incidents of non- . compliance, then the certification statement contained in the inspection form will apply. D) Non-Stormwater Discharges Appropriate measures must be taken to ensure that pollution prevention measures for the non-storm water component of the discharge are implemented. The non-storm water discharges associated with this project identified at this time are: gar ra. ✓ Discharges from fire-fighting activities ✓ Fire hydrant flushings ✓ Waters used to wash vehicles where detergents are not used ✓ Water used to control dust in accordance with EPA's CGP, Part 3, Subpart 3.4.G ✓ Potable water induding uncontaminated water line flushings ✓ Routine external building wash down that does not use detergents ✓ Pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred (unless all spilled material has been removed)and where detergents are not used ✓ Uncontaminated air conditioning or compressor condensate ✓ Uncontaminated ground water or spring water ✓ Foundation or footing drains where flows are not contaminated with process materials such as solvents ✓ Uncontaminated excavation dewatering ✓ Landscape irrigation E) Pollution Prevention Plan Awareness Individual Responsible for the training: Mr. Charlie Hurt General stormwater and BMP awareness training for staff and subcontractors: Mr. Hurt will conduct informal training for all staff, including subcontractors, on the site. The training will be conducted primarily via tailgate sessions and will focus on avoiding damage to Stormwater BMPs and preventing illicit discharges. The tailgate sessions will be conducted bi-weekly will address the following topics: erosion control BMPs, sediment control BMPs, non-stormwater BMPs, waste management and materials storage BMPs, and emergency procedure specific to the construction site. Detailed training for staff and subcontractors with specific stormwater responsibilities: Mr. Hurt will provide formal training to all staff and subcontractors with specific stormwater responsibilities, such as installing and maintaining BMPs. The formal training will cover all design and construction specifications for installing the BMPs ,., and proper procedures for maintaining each BMP. Formal training on the curb for any BMPs are installed on the site a a sir I certify that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is,to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine for knowing violations. Name: Title: ( �l`Gtei-t- Signature: ` �, �` _L/ ,r Date: " a a a a a a a a a a REFERENCES a. Virginia Department of Conservation and Recreation. 1992.Virginia Erosion and Sediment Control Handbook. Third Edition. Division of Soil and Water Conservation, Virginia Department of Conservation and Recreation. ar. ar a a a a a a �.a a a s.a a APPENDIX A Storm Water Construction General Permit No. VAR10 a a a a a a a a a a a a General Permit No.:VAR10 a. Effective Date: July 1,2014 Expiration Date: June 30,2019 a GENERAL VPDES PERMIT FOR DISCHARGES OF STORMWATER FROM CONSTRUCTION ACTIVITIES AUTHORIZATION TO DISCHARGE UNDER THE VIRGINIA STORMWATER MANAGEMENT A PRUOGRAM Z ATION AND THE VIRGINIA STORMWATER MANAGEMENT a pursuant to the Virginia In with the provisions adopted pursuant thereto, operators of construction revisions of the Clean Water Act, as amended, and p S r compliance Management Act and regulations adop p Stormwstar authorized Board regulations a ies of the that prohibit such to surface waters within the boundaries of the Commonwealth of Virginia, are authorized to discharge Virginia, except those specifically named in State Water Control discharges. page, Part I - Discharge Authorization le to and The authorized discharge shatobmwater Pollution Prevention Plan, and Part III -Conditions App Special Conditions, Part II St All VPDES Permits as set forth herein. a a a a a a PART I �.. DISCHARGE AUTHORIZATION AND SPECIAL CONDITIONS A. Coverage under this general permit. 1. During the period beginning with the date of coverage under this general permit and lasting until the general permits expiration date, the operator is authorized to discharge stormwater from construction activities. 2. This general permit also authorizes stormwater discharges from support activities (e.g., concrete or asphalt batch plants, equipment staging yards, material storage areas, excavated material disposal areas, borrow areas) located on-site or off-site provided that: a. The support activity is directly related to the construction activity that is required to have general .. permit coverage for discharges of stormwater from construction activities; b. The support activity is not a commercial operation, nor does it serve multiple unrelated construction activities by different operators; c. The support activity does not operate beyond the completion of the last construction activity it supports; d. The support activity is identified in the registration statement at the time of general permit coverage; "" e. Appropriate control measures are identified in a stormwater pollution prevention plan and implemented to address the discharges from the support activity areas; and f. All applicable state, federal, and local approvals are obtained for the support activity. B. Limitations on coverage. 1. Post-construction discharges. This general permit does not authorize stormwater discharges that originate from the site after construction activities have been completed and the site, including any support activity sites covered under the general permit registration, has undergone final stabilization. Post-construction industrial stormwater discharges may need to be covered by a separate VPDES permit. 2. Discharges mixed with nonstormwater. This general permit does not authorize discharges that are mixed with sources of nonstormwater, other than those discharges that are identified in Part I E (Authorized nonstormwater discharges) and are in compliance with this general permit. 3. Discharges covered by another state permit. This general permit does not authorize discharges of stormwater from construction activities that have been covered under an individual permit or required to obtain coverage under an alternative general permit. 4. Impaired waters and TMDL limitation. Discharges of stormwater from construction activities to surface waters identified as impaired in the 2012 § 305(b)/303(d)Water Quality Assessment Integrated Report or for which a TMDL wasteload allocation has been established and approved prior to the term of this general permit for(i) sediment or a sediment-related parameter(i.e., total suspended solids or turbidity) or (ii) nutrients (i.e., nitrogen or phosphorus)are not eligible for coverage under this general permit unless the operator develops, implements, and maintains a SWPPP that minimizes the pollutants of concern and, when applicable, is consistent with the assumptions and requirements of the approved TMDL wasteload .. allocations. In addition, the operator shall implement the following items: .r. a. The impaired water(s), approved TMDL(s), and pollutant(s)of concern, when applicable, shall be r` identified in the SWPPP; b. Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; c. Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and d. The applicable SWPPP inspection requirements specified in Part II F 2 shall be amended as follows: (1) Inspections shall be conducted at a frequency of(i) at least once every four business days or (ii) at least once every five business days and no later than 48 hours following a measurable storm '• event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and (2) Representative inspections used by utility line installation, pipeline construction, or other similar linear construction activities shall inspect all outfalls discharging to surface waters identified as impaired or for which a TMDL wasteload allocation has been established and a approved prior to the term of this general permit. 5. Exceptional waters limitation. Discharges of stormwater from construction activities not previously covered under the general permit issued in 2009 to exceptional waters identified in 9VAC25-260-30 A 3 c a are not eligible for coverage under this general permit unless the operator implements the following: a. The exceptional water(s) shall be identified in the SWPPP; b. Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; c. Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and d. The applicable SWPPP inspection requirements specified in Part II F 2 shall be amended as follows: (1) Inspections shall be conducted at a frequency of(i) at least once every four business days or (ii) at least once every five business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and aline (2) Representative inspections used by utility line installation, pipeline construction, or other similar linear construction activities shall inspect all outfalls discharging to exceptional waters. 6. There shall be no discharge of floating solids or visible foam in other than trace amounts. C. Commingled discharges. Discharges authorized by this general permit may be commingled with other sources of stormwater that are not required to be covered under a state permit, so long as the commingled discharge is in compliance with this general permit. Discharges authorized by a separate state or VPDES permit may be commingled with discharges authorized by this general permit so long as all such discharges comply with all applicable state and VPDES permit requirements. a S ... D. Prohibition of nonstormwater discharges. Except as provided in Parts I A 2, I C, and I E, all discharges covered by this general permit shall be composed entirely of stormwater associated with construction activities. All other discharges including the following are prohibited: °"` 1. Wastewater from washout of concrete; 2. Wastewater from the washout and cleanout of stucco, paint, form release oils, curing compounds, and other construction materials; 3. Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance; 4. Oils, toxic substances, or hazardous substances from spills or other releases; and 5. Soaps, solvents, or detergents used in equipment and vehicle washing. E. Authorized nonstormwater discharges. The following nonstormwater discharges from construction activities are authorized by this general permit when discharged in compliance with this general permit: 1. Discharges from firefighting activities; 2. Fire hydrant flushings; .� 3. Waters used to wash vehicles or equipment where soaps, solvents, or detergents have not been used and the wash water has been filtered, settled, or similarly treated prior to discharge; 4. Water used to control dust that has been filtered, settled, or similarly treated prior to discharge; 5. Potable water sources, including uncontaminated waterline flushings; 6. Routine external building wash down where soaps, solvents or detergents have not been used and the wash water has been filtered, settled, or similarly treated prior to discharge; 7. Pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred (or where all spilled or leaked material has been removed prior to washing); where soaps, solvents, or detergents have not been used; and where the wash water has been filtered, settled, or similarly treated prior to discharge; 8. Uncontaminated air conditioning or compressor condensate; 9. Uncontaminated ground water or spring water; 10. Foundation or footing drains where flows are not contaminated with process materials such as VIM solvents; 11. Uncontaminated excavation dewatering, including dewatering of trenches and excavations that have been filtered, settled, or similarly treated prior to discharge; and 12. Landscape irrigation. F. Termination of general permit coverage. 1. The operator of the construction activity shall submit a notice of termination in accordance with 9VAC25-880-60 to the VSMP authority after one or more of the following conditions have been met: a. Necessary permanent control measures included in the SWPPP for the site are in place and functioning effectively and final stabilization has been achieved on all portions of the site for which the operator is responsible. When applicable, long term responsibility and maintenance requirements shall be recorded in the local land records prior to the submission of a notice of termination; b. Another operator has assumed control over all areas of the site that have not been finally stabilized and obtained coverage for the ongoing discharge; c. Coverage under an alternative VPDES or state permit has been obtained; or d. For residential construction only, temporary soil stabilization has been completed and the residence has been transferred to the homeowner. 2. The notice of termination should be submitted no later than 30 days after one of the above conditions in subdivision 1 of this subsection is met. Authorization to discharge terminates at midnight on the date that the notice of termination is submitted for the conditions set forth in subdivisions 1 b through 1 d of this subsection. Termination of authorizations to discharge for the conditions set forth in subdivision 1 a of this subsection shall be effective upon notification from the department that the provisions of subdivision 1 a of this subsection have been met or 60 days after submittal of the notice of termination, whichever occurs first. 3. The notice of termination shall be signed in accordance with Part III K of this general permit. G. Water quality protection. 1. The operator must select, install, implement and maintain control measures as identified in the SWPPP at the construction site that minimize pollutants in the discharge as necessary to ensure that the operator's discharge does not cause or contribute to an excursion above any applicable water quality standard. 2. If it is determined by the department that the operator's discharges are causing, have reasonable potential to cause, or are contributing to an excursion above any applicable water quality standard, the department, in consultation with the VSMP authority, may take appropriate enforcement action and require the operator to: a. Modify or implement additional control measures in accordance with Part II B to adequately address the identified water quality concerns; b. Submit valid and verifiable data and information that are representative of ambient conditions and indicate that the receiving water is attaining water quality standards; or c. Submit an individual permit application in accordance with 9VAC25-870-410 B 3. All written responses required under this chapter must include a signed certification consistent with Part III K. IMO a PART II STORMWATER POLLUTION PREVENTION PLAN A stormwater pollution prevention plan (SWPPP) shall be developed prior to the submission of a �• registration statement and implemented for the construction activity, including any support activity, covered by this general permit. SWPPPs shall be prepared in accordance with good engineering practices. Construction activities that are part of a larger common plan of development or sale and disturb less than one acre may utilize a SWPPP template provided by the department and need not provide a separate stormwater management plan if one has been prepared and implemented for the larger common plan of development or sale. The SWPPP requirements of this general permit may be fulfilled by incorporating by reference other plans such as a spill prevention control and countermeasure (SPCC) plan developed for the site under§ 311 of the federal Clean Water Act or best management practices (BMP) programs otherwise required for the facility provided that the incorporated plan meets or exceeds the SWPPP requirements of Part II A. All plans incorporated by reference into the SWPPP become enforceable under this general permit. If a plan incorporated by reference does not contain all of the required elements of the SWPPP, the operator must develop the missing elements and include them in the SWPPP. Any operator that was authorized to discharge under the general permit issued in 2009, and that intends to continue coverage under this general permit, shall update its stormwater pollution prevention plan to comply with the requirements of this general permit no later than 60 days after the date of coverage under this general permit. A. Stormwater pollution prevention plan contents. The SWPPP shall include the following items: 1. General information. a. A signed copy of the registration statement, if required, for coverage under the general VPDES permit for discharges of stormwater from construction activities; b. Upon receipt, a copy of the notice of coverage under the general VPDES permit for discharges of stormwater from construction activities (i.e., notice of coverage letter); c. Upon receipt, a copy of the general VPDES permit for discharges of stormwater from construction activities; d. A narrative description of the nature of the construction activity, including the function of the project (e.g., low density residential, shopping mall, highway, etc.); e. A legible site plan identifying: (1) Directions of stormwater flow and approximate slopes anticipated after major grading activities; (2) Limits of land disturbance including steep slopes and natural buffers around surface waters that will not be disturbed; (3) Locations of major structural and nonstructural control measures, including sediment basins and traps, perimeter dikes, sediment barriers, and other measures intended to filter, settle, or similarly treat sediment, that will be installed between disturbed areas and the undisturbed vegetated areas in order to increase sediment removal and maximize stormwater infiltration; (4) Locations of surface waters; (5) Locations where concentrated stormwater is discharged; (6) Locations of support activities, when applicable and when required by the VSMP authority, including but not limited to (i)areas where equipment and vehicle washing, wheel wash water, and other wash water is to occur; (ii) storage areas for chemicals such as acids, fuels, fertilizers, �. and other lawn care chemicals; (iii)concrete wash out areas; (iv)vehicle fueling and maintenance areas; (v) sanitary waste facilities, including those temporarily placed on the construction site; and (vi) construction waste storage; and (7) When applicable, the location of the on-site rain gauge or the methodology established in consultation with the VSMP authority used to identify measurable storm events for inspection purposes. 2. Erosion and sediment control plan. a. An erosion and sediment control plan approved by the VESCP authority as authorized under the Erosion and Sediment Control Regulations (9VAC25-840), an "agreement in lieu of a plan"as defined in 9VAC25-840-10 from the VESCP authority, or an erosion and sediment control plan prepared in accordance with annual standards and specifications approved by the department. Any operator proposing a new stormwater discharge from construction activities that is not required to obtain erosion and sediment control plan approval from a VESCP authority or does not adopt department-approved annual standards and specifications shall submit the erosion and sediment control plan to the department for review and approval. OAP b. All erosion and sediment control plans shall include a statement describing the maintenance responsibilities required for the erosion and sediment controls used. ANS c. A properly implemented approved erosion and sediment control plan, "agreement in lieu of a plan," or erosion and sediment control plan prepared in accordance with department-approved annual standards and specifications, that adequately: (1) Controls the volume and velocity of stormwater runoff within the site to minimize soil erosion; (2) Controls stormwater discharges, including peak flow rates and total stormwater volume, to minimize erosion at outlets and to minimize downstream channel and stream bank erosion; (3) Minimizes the amount of soil exposed during the construction activity; (4) Minimizes the disturbance of steep slopes; ®.. (5) Minimizes sediment discharges from the site in a manner that addresses (i)the amount, frequency, intensity, and duration of precipitation; (ii)the nature of resulting stormwater runoff; and (iii) soil characteristics, including the range of soil particle sizes present on the site; (6) Provides and maintains natural buffers around surface waters, directs stormwater to vegetated areas to increase sediment removal, and maximizes stormwater infiltration, unless ,., infeasible; (7) Minimizes soil compaction and, unless infeasible, preserves topsoil; (8) Ensures that stabilization of disturbed areas will be initiated immediately whenever any clearing, grading, excavating, or other land-disturbing activities have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for a period IM,. exceeding 14 days; and (9) Utilizes outlet structures that withdraw stormwater from the surface (i.e., above the 0010 permanent pool or wet storage water surface elevation), unless infeasible, when discharging from sediment basins or sediment traps. 3. Stormwater management plan. a. New construction activities. A stormwater management plan approved by the VSMP authority as authorized under the Virginia Stormwater Management Program (VSMP) Regulation (9VAC25-870), or an "agreement in lieu of a stormwater management plan" as defined in 9VAC25-870-10 from the VSMP authority, or a stormwater management plan prepared in accordance with annual standards and specifications approved by the department. Any operator proposing a new stormwater discharge from construction activities that is not required to obtain stormwater management plan approval from a VSMP authority or does not adopt department-approved annual standards and specifications shall submit the stormwater management plan to the department for review and approval. b. Existing construction activities. Any operator that was authorized to discharge under the general permit issued in 2009, and that intends to continue coverage under this general permit, shall ensure compliance with the requirements of 9VAC25-870-93 through 9VAC25-870-99 of the VSMP WWI Regulation, including but not limited to the water quality and quantity requirements. The SWPPP shall include a description of, and all necessary calculations supporting, all post-construction stormwater management measures that will be installed prior to the completion of the construction process to control pollutants in stormwater discharges after construction operations have been completed. Structural measures should be placed on upland soils to the degree possible. Such measures must be designed and installed in accordance with applicable VESCP authority, VSMP authority, state, and federal requirements, and any necessary permits must be obtained. 4. Pollution prevention plan. A pollution prevention plan that addresses potential pollutant-generating activities that may reasonably be expected to affect the quality of stormwater discharges from the construction activity, including any support activity. The pollution prevention plan shall: a. Identify the potential pollutant-generating activities and the pollutant that is expected to be exposed to stormwater; b. Describe the location where the potential pollutant-generating activities will occur, or if identified �. on the site plan, reference the site plan; c. Identify all nonstormwater discharges, as authorized in Part I E of this general permit, that are or will be commingled with stormwater discharges from the construction activity, including any applicable support activity; d. Identify the person responsible for implementing the pollution prevention practice or practices for N.. each pollutant-generating activity(if other than the person listed as the qualified personnel); e. Describe the pollution prevention practices and procedures that will be implemented to: (1) Prevent and respond to leaks, spills, and other releases including (i) procedures for expeditiously stopping, containing, and cleaning up spills, leaks, and other releases; and (ii) procedures for reporting leaks, spills, and other releases in accordance with Part Ill G; (2) Prevent the discharge of spilled and leaked fuels and chemicals from vehicle fueling and maintenance activities (e.g., providing secondary containment such as spill berms, decks, spill containment pallets, providing cover where appropriate, and having spill kits readily available); (3) Prevent the discharge of soaps, solvents, detergents, and wash water from construction materials, including the clean-up of stucco, paint, form release oils, and curing compounds(e.g., providing (i) cover(e.g., plastic sheeting or temporary roofs)to prevent contact with stormwater; (ii) collection and proper disposal in a manner to prevent contact with stormwater; and (iii) a similarly effective means designed to prevent discharge of these pollutants); (4) Minimize the discharge of pollutants from vehicle and equipment washing, wheel wash water, and other types of washing (e.g., locating activities away from surface waters and stormwater inlets or conveyance and directing wash waters to sediment basins or traps, using filtration devices such as filter bags or sand filters, or using similarly effective controls); (5) Direct concrete wash water into a leak-proof container or leak-proof settling basin. The container or basin shall be designed so that no overflows can occur due to inadequate sizing or precipitation. Hardened concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wastes. Liquid concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wash waters and shall not be discharged to surface waters; $- (6) Minimize the discharge of pollutants from storage, handling, and disposal of construction products, materials, and wastes including (i) building products such as asphalt sealants, copper flashing, roofing materials, adhesives, and concrete admixtures; (ii) pesticides, herbicides, insecticides, fertilizers, and landscape materials; and (iii) construction and domestic wastes such as packaging materials, scrap construction materials, masonry products, timber, pipe and electrical cuttings, plastics, Styrofoam, concrete, and other trash or building materials; (7) Prevent the discharge of fuels, oils, and other petroleum products, hazardous or toxic wastes, and sanitary wastes; and (8) Address any other discharge from the potential pollutant-generating activities not addressed above; and ,.., f. Describe procedures for providing pollution prevention awareness of all applicable wastes, including any wash water, disposal practices, and applicable disposal locations of such wastes, to personnel in order to comply with the conditions of this general permit. The operator shall implement the procedures described in the SWPPP. 5. SWPPP requirements for discharges to impaired waters, surface waters with an applicable TMDL wasteload allocation established and approved prior to the term of this general permit, and exceptional waters. The SWPPP shall: a. Identify the impaired water(s), approved TMDL(s), pollutant(s) of concern, and exceptional waters identified in 9VAC25-260-30 A 3 c, when applicable; b. Provide clear direction that: (1) Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; (2) Nutrients shall be applied in accordance with manufacturer's recommendations or an "' approved nutrient management plan and shall not be applied during rainfall events; and (3) A modified inspection schedule shall be implemented in accordance with Part I B 4 or Part I B {N, 5. a 6. Qualified personnel. The name, phone number, and qualifications of the qualified personnel 11• conducting inspections required by this general permit. 7. Delegation of authority. The individuals or positions with delegated authority, in accordance with Part III K, to sign inspection reports or modify the SWPPP. 8. SWPPP signature. The SWPPP shall be signed and dated in accordance with Part III K. INN B. SWPPP amendments, modification, and updates. 1. The operator shall amend the SWPPP whenever there is a change in the design, construction, operation, or maintenance that has a significant effect on the discharge of pollutants to surface waters and VIM that has not been previously addressed in the SWPPP. 2. The SWPPP must be amended if, during inspections or investigations by the operator's qualified Wig personnel, or by local, state, or federal officials, it is determined that the existing control measures are ineffective in minimizing pollutants in discharges from the construction activity. Revisions to the SWPPP shall include additional or modified control measures designed and implemented to correct problems identified. If approval by the VESCP authority, VSMP authority, or department is necessary for the control measure, revisions to the SWPPP shall be completed no later than seven calendar days following approval. Implementation of these additional or modified control measures must be accomplished as described in Part II G. 3. The SWPPP must clearly identify the contractor(s)that will implement and maintain each control measure identified in the SWPPP. The SWPPP shall be amended to identify any new contractor that will a�. implement and maintain a control measure. 4. The operator shall update the SWPPP no later than seven days following any modification to its implementation. All modifications or updates to the SWPPP shall be noted and shall include the following items: a. A record of dates when: (1) Major grading activities occur; (2) Construction activities temporarily or permanently cease on a portion of the site; and a. (3) Stabilization measures are initiated; b. Documentation of replaced or modified controls where periodic inspections or other information have indicated that the controls have been used inappropriately or incorrectly and where modified as soon as possible; c. Areas that have reached final stabilization and where no further SWPPP or inspection requirements apply; d. All properties that are no longer under the legal control of the operator and the dates on which the operator no longer had legal control over each property; e. The date of any prohibited discharges, the discharge volume released, and what actions were taken to minimize the impact of the release; f. Measures taken to prevent the reoccurrence of any prohibited discharge; and a g. Measures taken to address any evidence identified as a result of an inspection required under Part II F. a 5. Amendments, modifications, or updates to the SWPPP shall be signed in accordance with Part III K. C. Public Notification. Upon commencement of land disturbance, the operator shall post conspicuously a copy of the notice of coverage letter near the main entrance of the construction activity. For linear projects, the operator shall post the notice of coverage letter at a publicly accessible location near an active part of the construction project(e.g., where a pipeline crosses a public road). The operator shall maintain the posted information until termination of general permit coverage as specified in Part I F. D. SWPPP availability. 1. Operators with day-to-day operational control over SWPPP implementation shall have a copy of the SWPPP available at a central location on-site for use by those identified as having responsibilities under the SWPPP whenever they are on the construction site. 2. The operator shall make the SWPPP and all amendments, modifications, and updates available upon request to the department, the VSMP authority, the EPA, the VESCP authority, local government officials, or the operator of a municipal separate storm sewer system receiving discharges from the construction activity. If an on-site location is unavailable to store the SWPPP when no personnel are present, notice of the SWPPP's location must be posted near the main entrance of the construction site. 3. The operator shall make the SWPPP available for public review in an electronic format or in hard copy. Information for public access to the SWPPP shall be posted and maintained in accordance with Part II C. If not provided electronically, public access to the SWPPP may be arranged upon request at a time and at a publicly accessible location convenient to the operator or his designee but shall be no less than M- once per month and shall be during normal business hours. Information not required to be contained within the SWPPP by this general permit is not required to be released. E. SWPPP implementation. The operator shall implement the SWPPP and subsequent amendments, modifications, and updates from commencement of land disturbance until termination of general permit coverage as specified in Part I F. 1. All control measures must be properly maintained in effective operating condition in accordance with good engineering practices and, where applicable, manufacturer specifications. If a site inspection required by Part II F identifies a control measure that is not operating effectively, corrective action(s) shall be completed as soon as practicable, but no later than seven days after discovery or a longer period as established by the VSMP authority, to maintain the continued effectiveness of the control measures. �• 2. If site inspections required by Part II F identify an existing control measure that needs to be modified or if an additional control measure is necessary for any reason, implementation shall be completed prior to the next anticipated measurable storm event. If implementation prior to the next anticipated measurable storm event is impracticable, then alternative control measures shall be implemented as soon as practicable, but no later than seven days after discovery or a longer period as established by the VSMP authority. �• F. SWPPP Inspections. 1. Personnel responsible for on-site and off-site inspections. Inspections required by this general permit shall be conducted by the qualified personnel identified by the operator in the SWPPP. The operator is responsible for insuring that the qualified personnel conduct the inspection. 2. Inspection schedule. a a. Inspections shall be conducted at a frequency of: a (1)At least once every five business days; or (2) At least once every 10 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 .af hours between business days, the inspection shall be conducted no later than the next business day. b. Where areas have been temporarily stabilized or land-disturbing activities will be suspended due to continuous frozen ground conditions and stormwater discharges are unlikely, the inspection frequency may be reduced to once per month. If weather conditions (such as above freezing temperatures or rain or snow events) make discharges likely, the operator shall immediately resume the regular inspection frequency. c. Representative inspections may be utilized for utility line installation, pipeline construction, or other similar linear construction activities provided that: (1) Temporary or permanent soil stabilization has been installed and vehicle access may compromise the temporary or permanent soil stabilization and potentially cause additional land disturbance increasing the potential for erosion; (2) Inspections occur on the same frequency as other construction activities; (3) Control measures are inspected along the construction site 0.25 miles above and below each access point(i.e., where a roadway, undisturbed right-of-way, or other similar feature intersects the construction activity and access does not compromise temporary or permanent soil stabilization); and (4) Inspection locations are provided in the report required by Part II F. 3. Inspection requirements. a. As part of the inspection, the qualified personnel shall: (1) Record the date and time of the inspection and when applicable the date and rainfall amount of the last measurable storm event; (2) Record the information and a description of any discharges occurring at the time of the inspection; ,. (3) Record any land-disturbing activities that have occurred outside of the approved erosion and sediment control plan; (4) Inspect the following for installation in accordance with the approved erosion and sediment control plan, identification of any maintenance needs, and evaluation of effectiveness in minimizing sediment discharge, including whether the control has been inappropriately or incorrectly used: (a) All perimeter erosion and sediment controls, such as silt fence; (b) Soil stockpiles, when applicable, and borrow areas for stabilization or sediment trapping measures; (c) Completed earthen structures, such as dams, dikes, ditches, and diversions for stabilization; (d) Cut and fill slopes; (e) Sediment basins and traps, sediment barriers, and other measures installed to control sediment discharge from stormwater; •• (f) Temporary or permanent channel, flume, or other slope drain structures installed to convey concentrated runoff down cut and fill slopes; (g) Storm inlets that have been made operational to ensure that sediment laden stormwater does not enter without first being filtered or similarly treated; and (h) Construction vehicle access routes that intersect or access paved roads for minimizing .• sediment tracking; (5) Inspect areas that have reached final grade or that will remain dormant for more than 14 days for initiation of stabilization activities; (6) Inspect areas that have reached final grade or that will remain dormant for more than 14 days for completion of stabilization activities within seven days of reaching grade or stopping work; (7) Inspect for evidence that the approved erosion and sediment control plan, "agreement in lieu of a plan," or erosion and sediment control plan prepared in accordance with department-approved annual standards and specifications has not been properly implemented. This includes but is not limited to: (a) Concentrated flows of stormwater in conveyances such as rills, rivulets or channels that have not been filtered, settled, or similarly treated prior to discharge, or evidence thereof; (b) Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; (c) Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; (d) Sediment deposition on any property (including public and private streets)outside of the construction activity covered by this general permit; (e) Required stabilization has not been initiated or completed on portions of the site; (f) Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; (g) Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and (h) Land disturbance outside of the approved area to be disturbed; (8) Inspect pollutant generating activities identified in the pollution prevention plan for the proper implementation, maintenance and effectiveness of the procedures and practices; (9) Identify any pollutant generating activities not identified in the pollution prevention plan; and (10) Identify and document the presence of any evidence of the discharge of pollutants prohibited by this general permit. 4. Inspection report. Each inspection report shall include the following items: a. The date and time of the inspection and when applicable, the date and rainfall amount of the last measurable storm event; b. Summarized findings of the inspection; c. The location(s) of prohibited discharges; d. The location(s) of control measures that require maintenance; e. The location(s) of control measures that failed to operate as designed or proved inadequate or inappropriate for a particular location; f. The location(s)where any evidence identified under Part II F 3 a (7) exists; g. The location(s)where any additional control measure is needed that did not exist at the time of inspection; h. A list of corrective actions required (including any changes to the SWPPP that are necessary) as a result of the inspection or to maintain permit compliance; i. Documentation of any corrective actions required from a previous inspection that have not been implemented; and I. The date and signature of the qualified personnel and the operator or its duly authorized representative. The inspection report and any actions taken in accordance with Part II must be retained by the operator as part of the SWPPP for at least three years from the date that general permit coverage expires or is terminated. The inspection report shall identify any incidents of noncompliance. Where an inspection report does not identify any incidents of noncompliance, the report shall contain a certification that the construction activity is in compliance with the SWPPP and this general permit. The report shall be signed in accordance with Part III K of this general permit. G. Corrective actions. ANN 1. The operator shall implement the corrective action(s) identified as a result of an inspection as soon as practicable but no later than seven days after discovery or a longer period as approved by the VSMP authority. If approval of a corrective action by a regulatory authority(e.g., VSMP authority, VESCP authority, or the department) is necessary, additional control measures shall be implemented to minimize pollutants in stormwater discharges until such approvals can be obtained. 2. The operator may be required to remove accumulated sediment deposits located outside of the construction activity covered by this general permit as soon as practicable in order to minimize environmental impacts. The operator shall notify the VSMP authority and the department as well as obtain all applicable federal, state, and local authorizations, approvals, and permits prior to the removal of sediments accumulated in surface waters including wetlands. a PART III CONDITIONS APPLICABLE TO ALL VPDES PERMITS NOTE: Discharge monitoring is not required for this general permit. If the operator chooses to monitor •• stormwater discharges or control measures, the operator must comply with the requirements of subsections A, B, and C, as appropriate. A. Monitoring. 1. Samples and measurements taken for the purpose of monitoring shall be representative of the monitoring activity. a 2. Monitoring shall be conducted according to procedures approved under 40 CFR Part 136 or alternative methods approved by the U.S. Environmental Protection Agency, unless other procedures have been specified in this general permit. Analyses performed according to test procedures approved under 40 CFR Part 136 shall be performed by an environmental laboratory certified under regulations adopted by the Department of General Services (1VAC30-45 or 1VAC30-46). 3. The operator shall periodically calibrate and perform maintenance procedures on all monitoring and analytical instrumentation at intervals that will ensure accuracy of measurements. B. Records. a 1. Monitoring records and reports shall include: - a. The date, exact place, and time of sampling or measurements; b. The individual(s)who performed the sampling or measurements; c. The date(s) and time(s) analyses were performed; d. The individual(s)who performed the analyses; e. The analytical techniques or methods used; and f. The results of such analyses. a 2. The operator shall retain records of all monitoring information, including all calibration and maintenance records and all original strip chart recordings for continuous monitoring instrumentation, ,r, copies of all reports required by this general permit, and records of all data used to complete the registration statement for this general permit, for a period of at least three years from the date of the sample, measurement, report or request for coverage. This period of retention shall be extended automatically during the course of any unresolved litigation regarding the regulated activity or regarding '® control standards applicable to the operator, or as requested by the board. C. Reporting monitoring results. 1. The operator shall update the SWPPP to include the results of the monitoring as may be performed in accordance with this general permit, unless another reporting schedule is specified elsewhere in this general permit. 2. Monitoring results shall be reported on a discharge monitoring report(DMR); on forms provided, approved or specified by the department; or in any format provided that the date, location, parameter, ,,,, method, and result of the monitoring activity are included. S 3. If the operator monitors any pollutant specifically addressed by this general permit more frequently than required by this general permit using test procedures approved under 40 CFR Part 136 or using other test procedures approved by the U.S. Environmental Protection Agency or using procedures specified in this general permit, the results of this monitoring shall be included in the calculation and reporting of the data submitted in the DMR or reporting form specified by the department. 4. Calculations for all limitations which require averaging of measurements shall utilize an arithmetic mean unless otherwise specified in this general permit. D. Duty to provide information. The operator shall furnish, within a reasonable time, any information which the board may request to determine whether cause exists for modifying, revoking and reissuing, or terminating this general permit or to determine compliance with this general permit. The board, department, EPA, or VSMP authority may require the operator to furnish, upon request, such plans, specifications, and other pertinent information as may be necessary to determine the effect of the wastes from his discharge on the quality of surface waters, or such other information as may be necessary to accomplish the purposes of the CWA and the Virginia Stormwater Management Act. The operator shall also furnish to the board, department, EPA, or VSMP authority, upon request, copies of records required to be kept by this general permit. E. Compliance schedule reports. Reports of compliance or noncompliance with, or any progress reports on, interim and final requirements contained in any compliance schedule of this general permit shall be submitted no later than 14 days following each schedule date. F. Unauthorized stormwater discharges. Pursuant to§62.1-44.5 of the Code of Virginia, except in compliance with a state permit issued by the department, it shall be unlawful to cause a stormwater discharge from a construction activity. G. Reports of unauthorized discharges. Any operator who discharges or causes or allows a discharge of sewage, industrial waste, other wastes or any noxious or deleterious substance or a hazardous substance or oil in an amount equal to or in excess of a reportable quantity established under either 40 CFR Part 110, 40 CFR Part 117, 40 CFR Part 302, or§62.1-44.34:19 of the Code of Virginia that occurs during a 24-hour period into or upon surface waters or who discharges or causes or allows a discharge that may reasonably be expected to enter surface waters, shall notify the Department of Environmental Quality of the discharge immediately upon discovery of the discharge, but in no case later than within 24 hours after said discovery. A written report of the unauthorized discharge shall be submitted to the department and the VSMP authority within five days of discovery of the discharge. The written report shall contain: 1. A description of the nature and location of the discharge; 2. The cause of the discharge; 3. The date on which the discharge occurred; 'r' 4. The length of time that the discharge continued; 5. The volume of the discharge; 6. If the discharge is continuing, how long it is expected to continue; 7. If the discharge is continuing, what the expected total volume of the discharge will be; and 8. Any steps planned or taken to reduce, eliminate and prevent a recurrence of the present discharge or any future discharges not authorized by this general permit. S Discharges reportable to the department and the VSMP authority under the immediate reporting requirements of other regulations are exempted from this requirement. H. Reports of unusual or extraordinary discharges. If any unusual or extraordinary discharge including a "bypass"or"upset," as defined herein, should occur from a facility and the discharge enters or could be expected to enter surface waters, the operator shall promptly notify, in no case later than within 24 hours, the department and the VSMP authority by telephone after the discovery of the discharge. This notification shall provide all available details of the incident, including any adverse effects on aquatic life and the known number of fish killed. The operator shall reduce the report to writing and shall submit it to the department and the VSMP authority within five days of discovery of the discharge in accordance with Part III 12. Unusual and extraordinary discharges include but are not limited to any discharge resulting from: 1. Unusual spillage of materials resulting directly or indirectly from processing operations; 2. Breakdown of processing or accessory equipment; 3. Failure or taking out of service of some or all of the facilities; and .r 4. Flooding or other acts of nature. I. Reports of noncompliance. The operator shall report any noncompliance which may adversely affect surface waters or may endanger public health. 1. An oral report to the department and the VSMP authority shall be provided within 24 hours from the time the operator becomes aware of the circumstances. The following shall be included as information that .a, shall be reported within 24 hours under this subdivision: a. Any unanticipated bypass; and VINO b. Any upset that causes a discharge to surface waters. 2. A written report shall be submitted within five days and shall contain: yr a. A description of the noncompliance and its cause; b. The period of noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the anticipated time it is expected to continue; and c. Steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance. a The department may waive the written report on a case-by-case basis for reports of noncompliance under Part Ill I if the oral report has been received within 24 hours and no adverse impact on surface aar waters has been reported. 3. The operator shall report all instances of noncompliance not reported under Part Ill 11 or 2 in writing as part of the SWPPP. The reports shall contain the information listed in Part III 12. NOTE: The reports required in Part Ill G, H and I shall be made to the department and the VSMP authority. Reports may be made by telephone, email, or by fax. For reports outside normal working hours, leaving a recorded message shall fulfill the immediate reporting requirement. For emergencies, the Virginia Department of Emergency Management maintains a 24-hour telephone service at 1-800-468-8892. a 4. Where the operator becomes aware of a failure to submit any relevant facts, or submittal of incorrect information in any report, including a registration statement, to the department or the VSMP authority, the operator shall promptly submit such facts or correct information. J. Notice of planned changes. 1. The operator shall give notice to the department and the VSMP authority as soon as possible of any planned physical alterations or additions to the permitted facility or activity. Notice is required only when: a. The operator plans an alteration or addition to any building, structure, facility, or installation that may meet one of the criteria for determining whether a facility is a new source in 9VAC25-870-420; IMP b. The operator plans an alteration or addition that would significantly change the nature or increase the quantity of pollutants discharged. This notification applies to pollutants that are not subject to effluent limitations in this general permit; or 2. The operator shall give advance notice to the department and VSMP authority of any planned �.. changes in the permitted facility or activity, which may result in noncompliance with state permit requirements. K. Signatory requirements. 1. Registration statement. All registration statements shall be signed as follows: ,., a. For a corporation: by a responsible corporate officer. For the purpose of this chapter, a responsible corporate officer means: (i) a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar policy-making or decision-making functions for the corporation; or(ii) the manager of one or more manufacturing, production, or operating facilities, provided the manager is authorized to make management decisions that govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long-term compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for state permit application requirements; and where authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures; b. For a partnership or sole proprietorship: by a general partner or the proprietor, respectively; or WIN c. For a municipality, state, federal, or other public agency: by either a principal executive officer or ranking elected official. For purposes of this chapter, a principal executive officer of a public agency includes: (i)the chief executive officer of the agency or(ii) a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency. 2. Reports, etc. All reports required by this general permit, including SWPPPs, and other information AIMP requested by the board or the department shall be signed by a person described in Part Ill K 1 or by a duly authorized representative of that person. A person is a duly authorized representative only if: a. The authorization is made in writing by a person described in Part Ill K 1; b. The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the operator. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and c. The signed and dated written authorization is included in the SWPPP. A copy must be provided to the department and VSMP authority, if requested. 3. Changes to authorization. If an authorization under Part III K 2 is no longer accurate because a different individual or position has responsibility for the overall operation of the construction activity, a new authorization satisfying the requirements of Part III K 2 shall be submitted to the VSMP authority as the "" administering entity for the board prior to or together with any reports or information to be signed by an authorized representative. 4. Certification. Any person signing a document under Part III K 1 or 2 shall make the following certification: "I certify under penalty of law that I have read and understand this document and that this document and all attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." L. Duty to comply. The operator shall comply with all conditions of this general permit. Any state permit noncompliance constitutes a violation of the Virginia Stormwater Management Act and the Clean Water Act, except that noncompliance with certain provisions of this general permit may constitute a violation of ,.. the Virginia Stormwater Management Act but not the Clean Water Act. Permit noncompliance is grounds for enforcement action; for state permit termination, revocation and reissuance, or modification; or denial of a state permit renewal application. The operator shall comply with effluent standards or prohibitions established under§ 307(a) of the Clean Water Act for toxic pollutants within the time provided in the regulations that establish these standards or prohibitions or standards for sewage sludge use or disposal, even if this general permit has not yet been modified to incorporate the requirement. M. Duty to reapply. If the operator wishes to continue an activity regulated by this general permit after the expiration date of this general permit, the operator shall submit a new registration statement at least 90 days before the expiration date of the existing general permit, unless permission for a later date has been "' granted by the board. The board shall not grant permission for registration statements to be submitted later than the expiration date of the existing general permit. .,,, N. Effect of a state permit. This general permit does not convey any property rights in either real or personal property or any exclusive privileges, nor does it authorize any injury to private property or invasion of personal rights, or any infringement of federal, state or local law or regulations. O. State law. Nothing in this general permit shall be construed to preclude the institution of any legal action under, or relieve the operator from any responsibilities, liabilities, or penalties established pursuant to any other state law or regulation or under authority preserved by§ 510 of the Clean Water Act. Except as provided in general permit conditions on "bypassing" (Part III U) and "upset" (Part III V), nothing in this general permit shall be construed to relieve the operator from civil and criminal penalties for noncompliance. a P. Oil and hazardous substance liability. Nothing in this general permit shall be construed to preclude the institution of any legal action or relieve the operator from any responsibilities, liabilities, or penalties to which the operator is or may be subject under§§62.1-44.34:14 through 62.1-44.34:23 of the State Water 41011 Control Law or§ 311 of the Clean Water Act. S AMY Q. Proper operation and maintenance. The operator shall at all times properly operate and maintain all facilities and systems of treatment and control (and related appurtenances), which are installed or used by the operator to achieve compliance with the conditions of this general permit. Proper operation and maintenance also includes effective plant performance, adequate funding, adequate staffing, and adequate laboratory and process controls, including appropriate quality assurance procedures. This provision requires the operation of back-up or auxiliary facilities or similar systems, which are installed by the operator only when the operation is necessary to achieve compliance with the conditions of this general permit. R. Disposal of solids or sludges. Solids, sludges or other pollutants removed in the course of treatment or management of pollutants shall be disposed of in a manner so as to prevent any pollutant from such materials from entering surface waters and in compliance with all applicable state and federal laws and •• regulations. S. Duty to mitigate. The operator shall take all steps to minimize or prevent any discharge in violation of this general permit that has a reasonable likelihood of adversely affecting human health or the environment. T. Need to halt or reduce activity not a defense. It shall not be a defense for an operator in an enforcement •• action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this general permit. U. Bypass. 1. "Bypass," as defined in 9VAC25-870-10, means the intentional diversion of waste streams from any portion of a treatment facility. The operator may allow any bypass to occur that does not cause effluent limitations to be exceeded, but only if it also is for essential maintenance to ensure efficient operation. These bypasses are not subject to the provisions of Part III U 2 and 3. 2. Notice. a. Anticipated bypass. If the operator knows in advance of the need for a bypass, the operator shall submit prior notice to the department, if possible at least 10 days before the date of the bypass. b. Unanticipated bypass. The operator shall submit notice of an unanticipated bypass as required in Part III I. 3. Prohibition of bypass. a. Except as provided in Part III U 1, bypass is prohibited, and the board or department may take enforcement action against an operator for bypass unless: (1) Bypass was unavoidable to prevent loss of life, personal injury, or severe property damage. Severe property damage means substantial physical damage to property, damage to the g ' treatment facilities that causes them to become inoperable, or substantial and permanent loss of natural resources that can reasonably be expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused by delays in production; (2) There were no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities, retention of untreated wastes, or maintenance during normal periods of equipment downtime. This condition is not satisfied if adequate back-up equipment should have been installed in the exercise of reasonable engineering judgment to prevent a bypass that occurred during normal periods of equipment downtime or preventive maintenance; and (3) The operator submitted notices as required under Part III U 2. b. The department may approve an anticipated bypass, after considering its adverse effects, if the department determines that it will meet the three conditions listed in Part III U 3 a. V. Upset. 1. An "upset," as defined in 9VAC25-870-10, means an exceptional incident in which there is unintentional and temporary noncompliance with technology-based state permit effluent limitations because of factors beyond the reasonable control of the operator. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or improper operation. 2. An upset constitutes an affirmative defense to an action brought for noncompliance with �•• technology-based state permit effluent limitations if the requirements of Part III V 4 are met. A determination made during administrative review of claims that noncompliance was caused by upset, and before an action for noncompliance, is not a final administrative action subject to judicial review. 3. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventative maintenance, or careless or improper operation. I- 4. An operator who wishes to establish the affirmative defense of upset shall demonstrate, through properly signed, contemporaneous operating logs or other relevant evidence that: a. An upset occurred and that the operator can identify the cause(s) of the upset; b. The permitted facility was at the time being properly operated; c. The operator submitted notice of the upset as required in Part III I; and d. The operator complied with any remedial measures required under Part III S. 5. In any enforcement proceeding, the operator seeking to establish the occurrence of an upset has the burden of proof. W. Inspection and entry. The operator shall allow the department as the board's designee, the VSMP authority, EPA, or an authorized representative of either entity(including an authorized contractor), upon presentation of credentials and other documents as may be required by law to: 1. Enter upon the operator's premises where a regulated facility or activity is located or conducted, or where records must be kept under the conditions of this general permit; 2. Have access to and copy, at reasonable times, any records that must be kept under the conditions of this general permit; "" 3. Inspect and photograph at reasonable times any facilities, equipment(including monitoring and control equipment), practices, or operations regulated or required under this general permit; and 4. Sample or monitor at reasonable times, for the purposes of ensuring state permit compliance or as otherwise authorized by the Clean Water Act or the Virginia Stormwater Management Act, any substances or parameters at any location. For purposes of this section, the time for inspection shall be deemed reasonable during regular business hours, and whenever the facility is discharging. Nothing contained herein shall make an inspection unreasonable during an emergency. IMP MOW w,. X. State permit actions. State permits may be modified, revoked and reissued, or terminated for cause. �• The filing of a request by the operator for a state permit modification, revocation and reissuance, or termination, or a notification of planned changes or anticipated noncompliance does not stay any state permit condition. V" Y. Transfer of state permits. 1. State permits are not transferable to any person except after notice to the department. Except as provided in Part III Y 2, a state permit may be transferred by the operator to a new operator only if the state permit has been modified or revoked and reissued, or a minor modification made, to identify the new operator and incorporate such other requirements as may be necessary under the Virginia Stormwater Management Act and the Clean Water Act. 2. As an alternative to transfers under Part III Y 1, this state permit may be automatically transferred to a new operator if: a. The current operator notifies the department at least 30 days in advance of the proposed transfer of the title to the facility or property; b. The notice includes a written agreement between the existing and new operators containing a specific date for transfer of state permit responsibility, coverage, and liability between them; and c. The department does not notify the existing operator and the proposed new operator of its intent to modify or revoke and reissue the state permit. If this notice is not received, the transfer is effective on the date specified in the agreement mentioned in Part III Y 2 b. 3. For ongoing construction activity involving a change of operator, the new operator shall accept and maintain the existing SWPPP, or prepare and implement a new SWPPP prior to taking over operations at the site. Z. Severability. The provisions of this general permit are severable, and if any provision of this general permit or the application of any provision of this state permit to any circumstance, is held invalid, the application of such provision to other circumstances and the remainder of this general permit shall not be affected thereby. .M a. SNIP APPENDIX B Forms: Notice of Registration Notice of Termination Application Fee Form Registration Statement General VPDES Permit for Discharges of Stormwater from Construction Activities (VAR10) ... (Please Type or Print All Information) 1- Construction Activity Operator: (General permit coverage will be issued to this operator The Certification in Item 1/12 must he signed by the appropriate person associated with this operator..)) SOW Name CL V A C NA.F7Qc5 ..Lfi e-_ --.--- —._ Contact: CI" c-r U c. a µ i --- — —Mailing Address. 1`a S .. City: C H c-c l e.i v:ll� State: v 4 Zip: L - . 11 Phone -")11 - 1151 Email address(if available):., C 14 i 1- 0 () (\le t ay n Jr Indicate if DEC)may transmit general permit correspondence electronically: Yes IX No[] Vie 2. Existing General Permit Registration Number(for renewals only): 3. Name and Location of the Construction Activity: f Name C.CA. t_r�C G� 5 b : l s, at'i Address(if available): 3� „o.�f/ .z<<�} R�k uricL pc:(�3 iS ur VON . Cay._c•V\ c Q t'C-S., )1C/ _. �. State:_ . . _ --Zip .01 County County(if not located within a City). Ai (U; Latitude(decimal degrees): __. Longitude(decimal degrees):__ Name and Location of all Off-site Support Activities to be covered under the general permit: Name: Address(if available): ... City: __- State: Zip County(if not located within a City). _— Latitude(decimal degrees): ,,. -__.,_ --. . Longitude(decimal degrees). "� 4. Status of the Construction Activity(check only one), Federal❑ State❑ Public❑ Private CK 5. Nature of the Construction Activity(e.g.,commercial,industrial,residential,agricultural,oil and gas,etc.): a rn f t 1 R`� ' ;AC- it us I- - "' 6. Name of the Receiving Water(s)and Hydrologic Unit Code(HUG): Name v I'1 s t t Name HUC — --- — -- — HUC. 3.-01 )04 MIN 7. If the discharge is through a Municipal Separate Storm Sewer System(MS4),the name of the MS4 operator: 8. Estimated Project Start and Completion Date: ,.. Start Date(mm/ddlyyyy). 071 l 1 •O 1�! - Completion Date(mmldd/yyyy);- L)-' 3 - a.0 1 17 9. Total Land Area of Development(to the nearest one-hundredth acre): C 3 7 7 t�, Estimated Area to be Disturbed(to the nearest one-hundredth acre): C © --.1 10. Is the area to be disturbed part of a larger common plan of development or sale? Yes❑ No 154 11. A stormwater pollution prevention plan (SWPPP) must be prepared in accordance with the requirements of the General VPDES Permit for Discharges of Stormwater from Construction Activities prior to submitting this Registration Statement. By signing this Registration Statement the operator is certifying that the SWPPP has been prepared. 12. Certification: "I certify under penalty of law that I have read and understand this Registration Statement and that this document and all attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief true- accurate, and complete. I am aware that there are significant penalties for submitting false information including the possibility of fine and imprisonment for knowing violations.” �j (� �„_, Printed Name- _ c(I e f1 n r i Title `{ (•� p�'_, �( Lt Yi ` - Signature: ----;_ _ Date "ti 3- .r. (Please sign in INK. This ertifica on m signed by the appropriate person associated with the operator identified in Item#1.) 01/2014 Page 1 at VOW amor 4.r DEPARTMENT OF ENVIRONMENTAL QUALITY CONSTRUCTION ACTIVITY OPERATOR PERMIT FEE FORM (Please Type or Print All Information) Instructions: Applicants for a Construction Activity Individual Permit are required to pay permit application fees Fees are also required for registration for coverage under a Construction Activity General Permit Fees must be paid when applications for state permit issuance, reissuance, modification or transfer are submitted. Applications will be considered incomplete if the proper fee is not paid and will not be processed until the fee is received 4r. The fee schedule for state permits is included with this form. Fees for state permit issuance. reissuance, maintenance modification and transfer are included. Once you have determined the fee for the type of application you are submitting. complete this form. The original copy of the form and your check or money order payable to "Treasurer of Virginia" .�. should be mailed to: Department of Environmental Quality Receipts Control P.O. Box 1104 Richmond,VA 23218 A copy of this form and a copy of your check or money order should accompany the permit application (or registration Ole statement). You should retain a copy for your records. Construction Activity Operator: IMO C V A C-07\7- c(2,7 (5f —, _____ Name: Contact:___C 1G rrr Mailing Address: c i 5 J l' ( b(?vxt / ( t t Zip: City: C�lc,( �,� C,S,,` • 11 Fr State- V A �Z 2-1 I I `-i_Phone: 3'4 _ 1 - 'ice, 611111 Email address(if available) C A 1'1 B �� L-- �.! �' NT'F t-' (3J _ _.. Name and Location of the Construction Activity: City: Site: v' . 11t:' — _— — State: Vi'7. ZiP'.__ � County: i-"t I Le, vi \c4 t e> _ ----__. Type of State Permit: El Construction Activity Individual Permit (i Construction Activity General Permit (from Fee Schedule) `� Type of Action: New Issuance ❑ Reissuance ❑ Maintenance <10r ❑Modification ❑ Transfer Amount of Fee Submitted (from Fee Schedule): (-) I 0 0 0410 —o Existing General Permit Registration Number(if applicable): a FOR DEQ USE ONLY Date: j DC#: a 01/2014 Page 1 of 1 yr. WO CONSTRUCTION ACTIVITY PERMIT FEE SCHEDULE follows:Individual(NOTE: Individual The fee for filing a state permit permit pp application for a Construction Activity Individual Permit( es The bye the Board s billed n follows: (NOTE: Individual permittees pay an annual p maintenance fee instead of a reapplication Y-v separately by DEG for the annual permit maintenance fee.) __ - .___..., --� �.r _.__. -_____.------- -- .—___.__- ISSUANCE ANCE TYPE _ STATE PERMIT ._ _.__--------_ -- .1.• $15,000 -\ Individual Permit for Discharges from Construction Activities__ _ �_ B. Registration Statem- ents. The fee for filing a state permit application (registration statement) for coverage under a Construction Activity General Permit issued by the Boards including follows:g a state or federal agency that does not administer a project in accordance with approved annual standards and specification , ISSUANCE TYPE OF STATE PERMIT _-__—___ -._--_-___ _ ----•"-- . ,.,, i General!Stormwater Management Small Construction Activity/Land Clearing(Areas within common plans $290 of development or sale with land-disturbance acreage less than one acre) - - —" _ ----- ---- _ .- I +ww common)Sans of development ornsale with land-disturbance acre acreage Clearing or(Sites greater than one acre and $2 700 common p - - less than five acres) �, `" common/sans of development Large Construction land-disturbance'acreage Clearing or(Sites reater than five acres and $3,400 "` common plans less than 10 acres) "- - _ - General S Management itland-disturbance� r within �. common plans of development sale with acreage qualto or grea er than 10 acres and $4.500 less than 50 acres) ---- --------' � $6 common e Sans of development rnsale with land-disturbance'acraga equal to or(Sites greater than 50 acres and %I - 00 -- common p .. _ . _ --l- �' less than 100 acres) - -- $9 600 General(Sans of development rnsale with land-disturbance lacreage qualm or(Sites than 100 within common plans by The fee for filing a state permit application(registration statement)for coverage under a approved ructio Activ ty G and ap erm t is issued say the Board for a state or federal agency that administers a project in accordance with app ■. follows: - -� _- —__- ISSUANCE TYPE OF STATE PERMIT �.. ____- Lar e"Construction Activity- $750 Construction General I Stormwater Management-Phase I Land Clearing(" 9 Sites or common plans of development or sale equal to or greater than 5 acres)- --- --- __.._--- -- - $450 ""' Construction General/Stormwater Management-Phase II Land Clearing("Small"Construction Activity Sites or common plans of development or sale equal to or greater than 1 acre and less than 5 acres) i _- WO WM WOW Page 1 of 2 01/2014 q.. Wow C. State Permit Modification or Transfer Fees. The following fees apply to the modification or transfer of a Construction Activity Individual Permit or a Construction Activity General Permit issued by the Board. The fee assessed shall be based on the total disturbed acreage of the construction activity. In addition to the state permit modification fee, modifications resulting in an increase in total disturbed acreage shall pay the difference in the initial Construction Activity General Permit fee paid and the Construction Activity General Permit fee that would have applied for the total disturbed acreage in Section B above. — TYPE OF STATE PERMIT i MODIFICATION General/Stormwater Management–Small Construction Activity/Land Clearing(Areas within common ! $20 plans of development or sale with land disturbance acreage less than one acre) General!Stormwater Management–Small Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than one and less $200 than five acres) General 1 Stormwater Management–Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than five acres and $250 less than 10 acres) tille General 1 Stormwater Management–Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than 10 acres and $300 less than 50 acres) General/Stormwater Management–Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than 50 acres and $450 less than 100 acres) General/Stormwater Management–Large Construction Activity/Land Clearing(Sites or areas within $700 common plans of development or sale with land-disturbance acreage equal to or greater than 100 acres) Individual Permit for Discharges from Construction Activities $5,000 D. State Permit Maintenance Fees. The following annual state permit maintenance fees apply to each state permit identified below. including expired permits that have been administratively continued. No annual state permit maintenance fee is required for coverage 41111 under a Construction Activity General Permit for a state or federal agency that administers a project in accordance with approved annual standards and specifications. TYPE OF STATE PERMIT MAINTENANCE — -- General/Stormwater Management–Small Construction Activity/Land Clearing(Areas within common $50 plans of development or sale with land disturbance acreage less than one acre) General/Stormwater Management–Small Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than one and less $400 than five acres) sae General/Stormwater Management–Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than five acres and $500 less than 10 acres) General/Stormwater Management–Large Construction Activity/Land Clearing(Sites or areas within — common plans of development or sale with land-disturbance acreage equal to or greater than 10 acres and $650 less than 50 acres) General/Stormwater Management–Large Construction Activity/Land Clearing(Sites or areas within — common plans of development or sale with land-disturbance acreage equal to or greater than 50 acres and $900 less than 100 acres) General/Stormwater Management–Large Construction Activity/Land Clearing(Sites or areas within $1.400 ,. common plans of development or sale with land-disturbance acreage equal to or greater than 100 acres) Individual Permit for Discharges from Construction Activities $3,000 01/2014 Page 2 of 2 VAN Hyland Ridge $ 4,500.00 Pavilions At Pantops $ 2,700.00 Cascadia $ 6,100.00 Mink Creek $ 2,700.00 Stonehenge $ 3,400.00 Hollymead Town Center $ 4,500.00 Advance Mills $ 2,700.00 Total $ 26,600.00 6380 CHARLER W HURT,LLC 6!1312014 Treasurer of VA Discount Payment Original Amt. Balance Due 26,600,00 ayme t 5116 Type Reference 26,600.00 26,600 00 26.600 00 5(1612014 Bill DCR Permits Check Amount 26,600 00 Union First Market Ba fl..l....C...R..c.n..e f QNt-h7K_R'!{M v.........,—•.,r..... aa. a a ®. APPENDIX C a Record of Land Disturbance a a a a a a a a a a a a a .r a O vl v m co E m a.. v CD a C Ws a a J W am U m rr VOW CD V L U) ar D C R m J r..� O 0 0 o sV C) Ala O o CD d � e — o f0°- E CO it ,C Q was O O J fi oar O ti v r L L, I y is* Q 41,4 • r. O h • t CO owo = ▪ a y E ar d Q J w W tir h 0 d C1 — 5 cco J ) m h MOO CD V rr (� L arr U) _57. C ego MOO J r w- 0 O �.. 0 o O o V d d w m Mr 3 0 h Q is W co co z Q CS O O C.) O p� J ? — i `4C � I srti O • I C i rr v V for We • a mQ CO m - et m e M a co E m all C.) 0m a O d o e y0 a eu a CO c m — • $ m J v m V1 0 we ar C) C.) C 45 r .0 L U) are 0 w 'a •5: C .1 MI al a J r,�,j. 0 ° C ° L V arf 0 O V A� A d W w I.i CO 3 a 0 r h Q. co E ea a .e v u Q O a a V z -J O ., N or O 4, h a O O 4 m V • I y •C tz L. y 4t rid C� a APPENDIX D Record of Site Inspections a a a a a a a a a „ a a a I VINO a) EL v C CU •• C N E. a) .. m o as u, a c h o c 'v) o OW E o o °- U a) .c — . 3 0 Q C co co NM E n E O U C M 0• .Z U) CD cu t0 N C c ✓ U CL) 0 • z p CC) _c Cl) N e C W• 2 4- .. _ - 0 0 a) 0 0 C lii v o li co � � � a) U Q CO C co C W a) i a) h c0 a '� a) d maZ > ,�. a Ix r e c U c0 Q O .r E o 4 Q 0 o 1— CC Z o, 'fi. o i Z C o d, a) y h C C d ti w J ` O Q = 'at t3 .. a) o E c y C+ 0+ al Df o C Z U) C.) Q AIM am _ E a- k _ % E f ® k 2 a § * k _ § .c U = _ 3 \ _ co E cu o _ 0f / V k k � ¢ / ® $ C ) k )$ w z o a \ 2 k S _ 73 Z 0 % 7 2 > Co air 0RS ctr_ 7 @ E 2 J # A o � / � � � 2 ¢ ca t k AIM § �z f o E S OWN § o 1 9 f k \ to f 4 2 / WO % ƒ /Rill III \ \ ) ® & % %E � E : 2 $ m � a a E ■ a c ea a c a3 a f_ co 0 O Cl) MOO a > E 0 f _ k a a) \ C ® E o) E C 3 0 : \ \ _ � / _ � / / f - _ / 0 / U) t42 . 4- � k = o / "0 $ — U ai _ - © E o2 � k CO � § $ ate 2 \ k % c co OM K v .0 ® & a —. a) ■ cam# � > _ fCt f tic Z C § Via E \ k \ o 4.. z \ c \ ~ � $ \ \ £ % 2 % § § o \ 3 U tor & . , A Z T / 27 WM .... k I f ■ _ C co a f ® \ k 2 C f $ low E \ a) £ 41111 % \ k ... E CO as E 0 t o _ C. / o. 3 .a en 2_ 5. 2 / e ia k k % a % t 2 4- � f % 2E� t _ '0 / � — o o c lis P o _ 2E / �* ¥ k W �in " % � i 0 ca k MINN a) ¢ t 8 a) @ § � ■ c a# > zfJ � f _ / & / � as MOP § o re Q U § o \ ) \ ® :k$ \ \ 6 OM o 5 � � \ \ = - / 2 \ E u _ k 7 L. � � z � / 27 VINO WM a - a E a) a a C CO ... c co ET. a) L a ai E) Cu N a c y o c .in m ... E o E 0 0 U a) L -c `r .3 a) co C c0 (0 E •fl o) E _ z 0 0 0 C i�+ U N a 0 •C N a) _ a) .c IMP 0 '0 0 „' = =� w 4- O a 'C a 0 m -2', Z E � U -o -C Cam) _ L h a V c c RI ,.. E o m -� Cu hi "Ci I.I. CtS 'Oa .. U Q m F. c Cu C a a) Q L 0 a) 0 c aZ > ram o . C-c a) c c U cu 0_ a a. E —y W o C r >, V •o F' o z t .• 6 C O NI, a) w -- u c 0 o L. m C.) c CO i_ d,53 a .I 6 N :;t3 es E c v E h Cu U) r� C� Q ... y.. APPENDIX E Authorized Representative Letter a a.. July 23, 2014 Ms. Holly Sepety Department of Environmental Quality . Storm Water Permitting 203 Governor Street, Suite 206 Richmond, VA 23219 RE: Authorization of SWPPP Coordinator Cascadia Blocks 4- 7 .. VSMP General Permit VAR 10 .. Dear Ms. Sepety, Per Part III K2 of the Stormwater Construction General Permit, I,the undersigned*, hereby . certify that the following SWPPP Coordinator: Mr. Guy Wright -'° Linco Inc. 434-981-3050 . is my duly authorized representative for the project referenced above. Sincerely, e444624-LW a""` Charl+i'a,Hurt CEVA . * Authorized Representative per Part III K1 of the Permit(Appendix A) a a a arr a APPENDIX F .r` Erosion and Sediment Control Narrative arr aa� ar. +air EROSION AND SEDIMENT CONTROL NARRATIVE FOR Cascadia (Blocks 4-7) a November 27, 2013 Revised: March 4, 2014 Revised: May 13, 2014 Revised: June 16, 2014 Tax Map 78-59, 78-59A, 62-25, 78E-H1 Rivanna District, Albemarle County, Virginia tip.. OWNER / DEVELOPER: Cascadia Development, LLC 170 South Pantops Drive ,.. Charlottesville, VA 22903 PREPARED BY: Dominion Engineering and Design, LLC 172 South Pantops Drive Charlottesville, VA 22903 P: 434.979.8121 F: 434.979.1681 a A. MINIMUM STANDARDS (MS): All applicable Virginia Erosion and Sediment Control Regulations and Minimum Standards shall be adhered to during all phases of construction. These include, but are not limited to the following: 1. STABLIZATION OF DENUDED AREAS: Permanent or temporary soil stabilization shall be applied to bare areas within seven days after final grade is reached on any portion of the site. Temporary soil stabilization shall be applied within seven days to denuded areas that may not be at final grade, but will remain dormant or undisturbed for longer than 30 days. Permanent stabilization shall be applied at areas that are to be left dormant for more than 1 year. 2. STABILIZATION OF SOIL STOCKPILES: During construction of the project, soil stockpiles shall be stabilized or protected with sediment trapping measures. The applicant is responsible for temporary protection and permanent stabilization of all soil stockpiles on site as well as soil intentionally transported from the project site. 3. PERMANENT VEGETATIVE COVER A permanent vegetative cover shall be established on denuded areas not otherwise permanently stabilized. Permanent vegetation shall not be considered established until a ground cover is achieve that, in the opinion of the county Inspector, is uniform and mature enough to survive to inhibit erosion. 4. TIMING & STABILIZATION OF SILT TRAPPING MEASURES: Sediment basins and traps, perimeter dikes, sediment barriers and other measures intended to trap sediment shall be constructed as a first step in any land disturbing activity .. and shall be made functional before upslope land disturbance takes place. 5. STABILIZATION OF EARTHEN STRUCTURES: Stabilization measures shall be applied to earthen structures such as dams, dikes and diversions immediately after installation. 6. SEDIMENT TRAPS AND BASINS: A sediment basin shall control surface runoff from disturbed areas that is comprised of flow from drainage areas greater than or equal to three acres. The sediment basin shall be designed and constructed to accommodate the anticipated sediment loading for the land disturbing activity. The outfall device or system device shall take into account the total drainage area flowing through the disturbed area to be served by the basin. 7. CUT AND FILL SLOPES: Cut and fill slopes shall be designed and constructed in a manner that will minimize erosion. Slopes that are found to be eroding excessively within one year of permanent stabilization shall be provided with additional slope stabilizing measures until the problem �- is corrected. 8. CONCENTRATED RUN-OFF DOWN CUT OR FILL SLOPES: Concentrated runoff shall not flow down cut or fill slopes unless contained within an adequate temporary or permanent channel, flume, or slope drain structure. 1 9. WATER SEEPS FROM A SLOPE FACE: Whenever water seeps from a slope face, adequate drainage or other protection shall be provided. 10. STORM SEWER INLET PROTECTION: All storm sewer inlets that are made operable during construction shall be protected so that sediment-laden water cannot enter the conveyance system without first being filtered or otherwise treated to remove sediment. 11. STABILIZATION OF OUTLETS: Before newly constructed stormwater conveyance channels are made operational, adequate outlet protection and any required temporary or permanent channel lining shall be installed in both the conveyance channel and receiving channel. •. 12. WORK IN LIVE WATERCOURSES: When work in a live watercourse is performed, precautions shall be taken to minimize encroachment, control sediment transport and stabilize the work area to the greatest extent possible during construction. Nonerodible material shall be used for the construction of causeways and cofferdams. Earthen fill may be used for these structures if armored by nonerodible cover materials. 13. CROSSING A LIVE WATERCOURSE: When a live watercourse must be crossed by construction vehicles more than twice in any six month period, a temporary stream crossing constructed of nonerodible materials shall be provided. 14. APPLICABLE REGULATIONS: All applicable federal, state and local regulations pertaining to working in or crossing live watercourses shall be met. 15. STABILIZATION OF BED AND BANKS The bed and banks of a watercourse shall be stabilized immediately after work in the watercourse is completed. 16. UNDERGROUND UTILITIES: Underground utilities shall be installed in accordance with the following standards in addition to other criteria: a. No more than 500 linear feet of trench may be opened at one time. b. Excavated material shall be placed on the uphill side of trenches c. Effluent for dewatering operations shall be filtered or passed through approved sediment trapping device, or both, and discharged in a manner that does not adversely affect flowing streams or offsite property. d. Material used for backfilling trenches shall be properly compacted in order to minimize erosion and promote stabilization. e. Restabilization shall be accomplished in accordance with these regulations. f. Applicable safety regulations shall be complied with. 17. CONSTRUCTION ACCESS ROUTES: Where construction vehicle access routes intersect paved public roads, provisions shall be made to minimize the transport of sediment by vehicular tracking onto paved surfaces. Where sediment is transported on to a public road surface, the road shall be cleaned thoroughly at the end of each day. Sediment shall be removed by shoveling or sweeping 2 and transported to a sediment control disposal area. Street washing shall be allowed only after sediment is removed in this manner. This provision shall apply to individual lots as well as to larger land disturbing activities. 18. TEMPORARY E&S CONTROL MEASURE REMOVAL: All temporary erosion and sediment control measures shall be removed within 30 days after final site stabilization or after temporary measures are no longer needed, unless otherwise authorized by the local program authority. Trapped sediment and the disturbed soil areas resulting from the disposition of temporary measures shall be permanently stabilized to prevent further erosion and sediment. 19. ADEQUACY OF RECEIVING CHANNELS: Properties and waterways downstream from the development site shall be protected from sediment deposition, erosion and damage, due to increases in volume, velocity and peak flow rates of stormwater runoff for the stated frequency storm of 24-hour duration. B1. PROJECT DESCRIPTION: .. The purpose of this plan is to provided early grading for a project that is to construct 146 new homes on the Cascadia development site. Also included is the construction of roadways, public water, sanitary sewer main & storm sewer. The total area to be disturbed by this project will be 53.18 acres. B2. EXISTING SITE CONDITIONS: The site currently vacant and is primarily wooded. Some clearing across the site has occurred in the Spring of 2013 to install the sanitary sewer outfall for the Hyland Ridge Subdivision. B3. ADJACENT AREAS: The site is bounded to the North by the Broadus Memorial Baptist Church, to the east by Hyland Ridge, to the south and southeast by the Fontana Subdivision, and to the west by State Route 20. B4. SOIL DESCRIPTIONS: See attached Soil Resource Report by the Natural Resources Conservation Service (NRCS) B5. CRITICAL AREAS: There are critical slopes on this site that are to be disturbed. A critical slopes waiver has been obtained to disturb a portion of the critical slopes within the development area. There is also a stream that runs across the northeast perimeter of the site. Refer to the Erosion and Sediment Control Plan for details on protection of critical areas to remain. B6. EROSION AND SEDIMENT CONTROL MEASURES: Unless otherwise indicated, all erosion and sediment control practices will be constructed and maintained according to the minimum standards and specifications as set forth in the Virginia Erosion and Sediment Control Handbook, latest edition. The minimum standards of the Virginia Erosion and Sediment Control Regulations shall be adhered to unless otherwise waived or approved by variance. �. SAFETY FENCE (SAF)— 3.01 Safety fence will be installed to prevent access to erosion control measures. Location and details are shown on the plans. 3 TEMPORARY CONSTRUCTION ENTRANCE (CE) — 3.02 An asphalt pad shall be constructed at the entrance of the project site to provide a means of removing sediment from the tires of construction vehicles leaving the work site. The Contractor shall remove any mud from the existing road surface by means of sweeping and shoveling, in the event the stone pad is not adequate in sediment removal. SILT FENCE (SF) —3.05 Silt fencing will be installed as a first step in construction activities. Location and details are shown on the plans. a STORM DRAIN INLET PROTECTION (IP) — 3.07 A sediment filter around storm drain inlet to prevent sediment from entering storm drainage systems. Storm drain inlet protection will be installed according to Virginia Erosion and Sediment Control regulations. Location and details are shown on the plans. CULVERT INLET PROTECTION (CIP) —3.08 A sediment filter located at the inlet to storm sewer culverts to prevent sediment from entering. Culvert inlet protection will be installed according to Virginia Erosion and Sediment Control regulations. Location and details are shown on the plans. TEMPORARY DIVERSION DIKE (DD) — 3.09 A temporary diversion dike will be installed before site grading begins, for the purposes of diverting storm and sediment-laden runoff to the appropriate outlet or trapping facility. Location and details are shown on the plans. TEMPORARY SEDIMENT BASINS (SB) — 3.13 A temporary sediment basin will be installed before site grading begins, for the purpose of detaining sediment-laden runoff from disturbed areas. Location and details of the sediment traps are shown on the plans. TEMPORARY SEDIMENT TRAP (ST) — 3.14 Three temporary sediment trap will be installed before site grading begins, for the purpose of detaining sediment-laden runoff from disturbed areas. Location and details of the sediment traps are shown on the plans. OUTLET PROTECTION (OP) —3.18 Outlet protection will be installed according to Virginia Erosion and Sediment Control regulations. Location and details are shown on the plans. DUST CONTROL (DC) — 3.39 A variety of methods are available to prevent surface and air movement of dust from �. exposed soil surfaces and reduce the presence of airborne substances which may present health hazards, traffic safety problems or harm animal or plant life. B7. PERMANENT AND TEMPORARY STABILIZATION: SURFACE ROUGHENING—3.29 Disturbed areas to be seeded and mulched shall be left in a roughened condition to help decrease runoff velocities and aid in the establishment of vegetation. ,� 4 d.. TOPSOILING -3.30 Topsoil may be stripped from the area to be graded and stockpiles for later use. All stockpiles which will be left dormant for more than 30 days shall be temporarily seeded. A topsoil stockpile may be selected onsite by the developer and shall be temporarily protected with surrounding silt fencing. TEMPORARY SEEDING - 3.31 Temporary soil stabilization shall be applied within 7 days to denuded areas that may not be at final grade, but will remain dormant (undisturbed)for longer than 30 days and less than 1 year. This includes, but is not limited to areas such as soil stockpiles. Seeded areas shall be limed when necessary at a rate of 2 tons per acre, and fertilized at a rate of 450 lbs. per acre of 10-20-20 (10 lbs. per 1,000 square feet) or equivalent. A Temporary Seeding Schedule is attached for proper seed selection. PERMANENT SEEDING - 3.32 A perennial vegetative covering shall be established on disturbed areas within 7 days of being brought to final grade on areas not otherwise protected. Selection of the seed mixture shall depend on the time of year it is to be applied according to the Permanent Seed Schedule as shown on the drawing. Seeded areas shall be limed when necessary at a rate of 2 tons per acres, and fertilized at a rate of 1,000 lbs. per acre of 10-20-10 (10 lbs. per 1,000 square feet) or equivalent. MULCHING - 3.35 All seeded areas shall be mulched with straw immediately following seeding operations. Straw mulch shall be applied at a rate of two tons per acre. SOIL STABILIZATION BLANKETS AND MATTING - 3.36 Soil stabilization matting shall be applied in the conveyance areas of the designed diversions to help reduce velocities and aid in the establishment of vegetation. A detail showing the proper materials and installation is shown on the plan. B8. SOIL STOCKPILES AND BORROW AREAS The lower half of the site is for future development and soil stockpiles will be placed on this area as needed. B9. OFF-SITE AREAS: There will not be a need for borrow material. Excess material will be stored in a soil stock pile for future use. B10. STORM WATER MANAGEMENT: A proposed wet pond with an aquatic bench at the northwest corner of the site and an existing dry pond at the southwest corner of the site are proposed to provide stormwater management for the site. A temporary sediment basin is proposed at the southeast corner of the site to provide controls during construction. Runoff to the eastern perimeter of the site is reduced after construction. -� 1311. MAINTENANCE SCHEDULE: A program of maintenance for the erosion and sediment controls specified in this narrative and shown on the plans are recommended as follows: 1. The Site Superintendent or his representative shall make a visual inspection of all erosion and sediment controls on a daily basis until the site is stabilized and especially „ 5 after a heavy rainfall to assure that all controls are in place and that none have been damaged. Any damaged control shall be repaired prior to the end of each workday to include re-seeding if necessary. 2. All silt trapping devices shall be cleaned out at 50 percent capacity and sediment shall be disposed of by spreading on site. 3. Gravel outlets shall be checked regularly for sediment buildup that may prevent drainage. Controls shall be inspected and repaired after each rainfall and cleaned if sediment has accumulated to half of the device's original height. 4. All earthen structures such as diversion dikes and berms shall be checked daily during construction for breaching by equipment. Repairs shall be made immediately. �- 5. Silt fences shall be checked after each rainstorm to assure they have not fallen or become clogged with silt. All repairs shall be made immediately. 6. All seeded areas shall be inspected regularly to see that good stand is maintained. Areas will be re-fertilized and re-seeded as necessary. 7. After construction operations have ended and disturbed areas have been stabilized, all berms and sediment-trapping devices may be removed, after removal the ground shall a be restored to its natural or proposed condition to include establishment of permanent vegetation. Removal of any control is contingent upon approval of the County Inspector. a a a �„ 6 a ar APPENDIX G Stormwater Management Narrative aa. aw ar �.a arr ar a ar ar CASCADIA SUBDIVISION HYDROLOGIC/HYDRAULIC CALCULATIONS FOR CASCADIA SUBDIVISION - BLOCKS 4-7 April 22, 2013 Revised November 22, 2013 Revised July 22, 2014 Revised August 14, 2014 LOCATION: Tax Map 62, Parcel 25 Tax Map 78, Parcels 59 & 59A Tax Map 78E, Parcel H1 Rio District, Albemarle County, Virginia .. . • DEVELOPER: Redus VA Housing, LLC. 170 South Pantops Drive Charlottesville, Virginia 22903 PREPARED BY: Dominion Engineering & Design, LLC 172 South Pantops Drive Charlottesville, VA 22911 P: 434.979.8121 F: 434.979.1681 INDEX Summary: 2-7 Unit Hydrographs 8-9 Pre-Development: Hydrographs: DA-Pond 2 10-12 Post-Development - Pond-2: Hydrographs: DA-Pond 2 13-17 Water Quality Volume Report: 18 SWM-2 & Outlet Structure: 19-24 Routed Hydrographs: 25-30 *Drainage Area Maps are included on Storm Water Management Plan CASCADIA SUBDIVISION Run-Off Summary Pond 1 Pond one is an existing extended detention stormwater management facility used to detain and treat stormwater run-off from the existing Fontana Subdivision. The pond will be left as is. The proposed, drainage area for the pond as shown on the approved Stormwater Management Report by McKee Carson is 39.03 acres with a runoff coefficient of 0.47 and generates run-off from a 10-Year storm of 83.36 cfs. The current proposed drainage area for Pond 1 is 29.24 acres with a runoff coefficient of 0.36, and generates a peak flow 29.04 cfs. Note, the overall drainage area as well as the impervious area within the drainage area has been decreased. Pond 2 a Proposed Pond 2 is a wet pond facility with an aquatic bench that will provide stormwater quality and detention. Pond 2 is designed with consideration for full build out of future Town District phase. Because it has been determined that there are inadequate channels downstream, the allowable release rate is determined per Albemarle County Design Standards Manual, Section F, lowering the allowable release rate to a fraction of the pre-forested conditions run-off determined by the calculation below: Q(allowable)<= Qf(Vf I VPost), where Qf is flow from the site in a well forested condition (Cn=51), Vf is volume from the site in a well forested condition, and VPost is volume from the site in post-development conditions. In addition to meeting the above release rate requirements, the following conditions will also be met: 1. Detain the WQV(1" Runoff)and release over 48 hours. 2. Detain the 1 year 24-hour storm and release over 24 hours. a a a a a a �• 2 - CASCADIA SUBDIVISION Pre-Development Conditions: 1.5 Yr. Pre-Development Run-Off(Cn=51) = DA-A= 3.16 cfs a 1.5 Yr. Pre-Development Run-Off Volume =42,253 Sq. Ft. 2 Yr. Pre-Development Run-Off(Cn=51) = DA-A= 3.83 cfs 2 Yr. Pre-Development Run-Off Volume =47,045 Sq. Ft. 10 Yr. Pre-Development Run-Off(Cn=51) = DA-A= 27.83 cfs 10 Yr. Pre-Development Run-Off Volume = 172,498 Sq. Ft. Post-Development Conditions: 1.5 Yr. Post-Development Run-Off Volume= DA-X= 249,163 Sq. Ft. 2 Yr. Post-Development Run-Off Volume = DA-X= 261,796 Sq. Ft. ... 10 Yr. Post-Development Run-Off Volume = DA-X= 518,800 Sq. Ft. Allowable Release Rate: Q1.5 (allowable) = 3.16(42,253/249,163) = 0.536 cfs Q2 (allowable) = 3.83(47,045/261,796) = 0.688 cfs Q10 (allowable) = 27.83(172,498/518,800) = 9.253 cfs Post-Development Release Rate Summary: Q1.5 Post-Development Routed = 0.47 cfs < 0.536 cfs Q2 Post-Development Routed = 0.48 cfs < 0.688 cfs Q10 Post-Development Routed = 8.41 cfs < 9.253 cfs a a 3 CASCADIA SUBDIVISION Detention of the WQV(1" Runoff)and release over 48 hours: WQV= 31,323 cf. Average Flow Rate to Achieve 48 Hour Draw Down: Q = 31,323 cf. / 172,800 sec. Q = 0.179cfs Orifice Size Needed: �• A= Q/[64.32 X(h/2)]^1/2 *(0.6) Average h = 1'; Q = 0.179 cfs A= 0.0526 sf. d = 2 (A/3.14)^1/2 = 0.2588 ft. => 3.106 In. Orifice provided = 3.0 in. < 3.106 in. a Detention of the 1 year 24-hour storm and release over 24 hours: 1 year 24-hour storm volume = 224,769.6 cf. (see hydrograph below) a Average Flow Rate to Achieve 24 Hour Draw Down: Q =224,769.6 cf. /86,400 sec. Q =2.60 cfs a Routed Flow for 1-year 24-hour storm = 0.45 cfs maximum < 2.60 cfs. a a a ( Please Refer Calculations on following Pages ) r a a '°' 4 400. CASCADIA SUBDIVISION ..` Soils Analysis: DA-X& DA-A Soil Map custom Soil Resource Report .. Sod Map e n k k .100 00 . n 1i .n 724700 ..u r or 2,35" I� - 0312 34 . , ` f 1 v -I S a 2l!, I' e 9111110 n It n rj WO J 7 f,li,. N - s` `\ tr Y, .r \ \\ _ 38'213' 38°Z'14' n o t 00 •. VI CO n it 1.4Ip Srale 145108 peiled on Am 185`x11"l sheet tr N Aleens t. k 0 50 100 200 300 k Feet 91It 1i 0 250 500 1.000 1.500 MIMI AWN W OM 5 S CASCADIA SUBDIVISION Map Unit Legend Albemarle County,Virginia(VA003) Map Unit Symbol Map Unit Name Acres in A01 Percent of AO! 12C Catoctin silt loam,7 to 15 percent slopes 0.9 2.0% 12E Catoctin silt loam,25 to 45 percent 6.2 13.1% Q.. slopes 71B Rabun clay loam,2 to 7 percent slopes 6.5 13.8% 71C Rabun clay loam,7 to 15 percent slopes 9.7 20.6% 71D Rabun clay loam,15 to 25 percent slopes 8.5 18.0% 72B3 Rabun clay,2 to 7 percent slopes, 0.5 1.1% severely eroded ... 72C3 Rabun clay,7 to 15 percent slopes, 5.0 10.5% severely eroded 72D3 Rabun clay, 15 to 25 percent slopes, 3.4 7.3% severely eroded 72E3 Rabun clay,25 to 45 percent slopes, 2 6 5.5% severely eroded ++ 79B Starr silt loam,2 to 7 percent slopes 3.8 8.1% Totals for Area of Interest 47.0 100.0% wr Hydrologic Group B Soils: 71B 13.8% 71C 20.6% 71D 18.0% 72B3 1.1% 72C3 10.5% 72D3 7.3% 72E3 5.5% 76.8% Hydrologic Group C Soils: 12C 2.0% 12E 13.1% 79B 8.1% 23.2% Weighted Cn Values: Pavement, Buidling, Patios, Sidewalks: 98 Fair Pasture/Yards: 62 Wooded Area: 57 Gravel: 86 6 CASCADIA SUBDIVISION Cn Value Calculations: DA-Pond 2 Pre-Development For 1.5-Year, 2-Year& 10-Year Storm Calculations: Cn=51 per Albemarle County Design Standards Manual, Section F. DA-Pond 2 Post-Development(45.54 Acres): Houses(Cn=98)—4.270 Acres Lead Walks/Patios (Cn=98)—0.250 Acre Roads (Cn=98)—3.400 Acre Walks(Cn=98)-0.550 Acre Neighborhood Center/Amenities (Cn=98)—0.551 Acre Driveways (Cn=98)—1.350 Acre Proposed Yard (Cn=62)—5.893 Acre a Wooded Area (Cn=57)—3.000 Acres Parks/Utility Strips (Cn=62)—1.800 Acres Future Town Phase(Cn=75)—24.476 Acres 10.371(98)+7.693(62)+24.476(75)+ 3.000(57) = 77 45.54 a a a a a .. 7 CASCADIA SUBDIVISION Name: DA-Pond 2 - Pre-Forested Condition (Cn=51) «.. Type: SCS Curvilinear Unit Hydrograph [UNIT HYDROGRAPH INFORMATION] Peak Flow (Qp) = 91.85 (cfs) Time to Peak (Tp) = 23.02 (min) Time of Base (Tb) = 115.10 (min) Volume = 3.89 (ac-ft) Shape Factor = 484 .00 Time Step = 2.00 (min) Excess Rain = 1.00 (in) ... Storm Duration = 4 .59 (min) Lag Time = 20.72 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 46.60 51 +. [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning's Roughness Coef. (n) = 0.40 2-yr 24-hr Rainfall (R) = 3.70 (in) Flow Length (L) = 300.00 (ft) Land Slope (S) = 0. 15 (ft/ft) Travel Time of Sheet Flow = 21.48 (min) SHALLOW FLOW K_Coefficient (K) = 0.35 Flow Length (L) = 835.00 (ft) Watercourse Slope (S) = 0.22 (ft/ft) Travel Time of Shallow Flow = 8.48 (min) Velocity (V).0 = 1. 64 (ft/s) CHANNEL FLOW Hydraulic Radius (R) = 0.26 (ft) Manning's Roughness Coef. (n) = 0.03 Flow Length (L) = 1570.00 (ft) Channel Slope (S) = 0.08 (ft/ft) Travel Time of Channel Flow = 4 .57 (min) [TIME OF CONCENTRATION] Time of Concentration (Tc) = 34 .53 (min) am w. 8 CASCADIA SUBDIVISION Name: Pond 2 - Post-Development "' Type: SCS Curvilinear Unit Hydrograph [UNIT HYDROGRAPH INFORMATION] Peak Flow (Qp) = 113.73 (cfs) Time to Peak (Tp) = 18.17 (min) Time of Base (Tb) = 90.84 (min) Volume = 3.80 (ac-ft) Shape Factor = 484 .00 Time Step = 2.00 (min) Excess Rain = 1.00 (in) Storm Duration = 3. 62 (min) Lag Time = 16.35 (min) +r [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 45.54 77 [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning's Roughness Coef. (n) = 0.40 2-yr 24-hr Rainfall (R) = 3.70 (in) Flow Length (L) = 300.00 (ft) ,W Land Slope (S) = 0. 19 (ft/ft) Travel Time of Sheet Flow = 19.54 (min) SHALLOW FLOW m" K_Coefficient (K) = 0.35 Flow Length (L) = 541.00 (ft) Watercourse Slope (S) = 0.20 (ft/ft) Travel Time of Shallow Flow = 5.76 (min) Velocity (V) = 1.57 (ft/s) CHANNEL FLOW «• Hydraulic Radius (R) = 0.26 (ft) Manning's Roughness Coef. (n) = 0.01 Flow Length (L) = 1545.00 (ft) Channel Slope (S) = 0.08 (ft/ft) Travel Time of Channel Flow = 1. 95 (min) [TIME OF CONCENTRATION] Time of Concentration (Tc) = 27.25 (min) 9 ... CASCADIA SUBDIVISION Name: DA-Pond 2 Pre-Forested 1.5-Year (Cn=51) m. Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 3.16 (cfs) Time to Peak (Tp) = 746.00 (min) Time of Base (Tb) = 1552.59 (min) Volume = 0. 97 (ac-ft) "' Time Step = 2.00 (min) Flow Multiplier = 1.00 ..r [UNIT HYDROGRAPH INFORMATION] Number = 3 Type = SCS Curvilinear Peak Flow (Qp) = 91.85 (cfs) Time to Peak (Tp) = 23.02 (min) Time of Base (Tb) = 115.10 (min) Volume = 3.89 (ac-ft) Shape Factor = 484 .00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 20.72 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 46. 60 51 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 34 .53 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 3. 60 (in) Return Period = 1. 5 (yr) Storm Duration = 24 .00 (hr) a a "` 10 CASCADIA SUBDIVISION Name: DA-Pond 2 Pre-Forested 2-Year (Cn=51) Type: Computed Flood [HYDROGRAPH INFORMATION] m. Peak Flow (Qp) = 3.83 (cfs) Time to Peak (Tp) = 746.00 (min) Time of Base (Tb) = 1552.59 (min) Volume = 1.08 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] m. Number = 3 Type = SCS Curvilinear Peak Flow (Qp) = 91.85 (cfs) Time to Peak (Tp) = 23.02 (min) Time of Base (Tb) = 115. 10 (min) Volume = 3.89 (ac-ft) Shape Factor = 484.00 .�. Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 20.72 (min) m. [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] m. Description Area CN m., Overall Approximation 46. 60 51 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 34 .53 (min) m. [RAINFALL DESCRIPTION] Distribution Type = SCS II m. Total Precipitation = 3.70 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) yr. ... °� 11 �.. CASCADIA SUBDIVISION Name: DA-Pond 2 Pre-Forested 10-Year (Cn=51) Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 27.83 (cfs) Time to Peak (Tp) = 738.00 (min) Time of Base (Tb) = 1552.59 (min) Volume = 3. 96 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 .. [UNIT HYDROGRAPH INFORMATION] Number = 3 Type = SCS Curvilinear Peak Flow (Qp) = 91. 85 (cfs) m.. Time to Peak (Tp) = 23.02 (min) Time of Base (Tb) = 115. 10 (min) Volume = 3.89 (ac-ft) Shape Factor = 484 .00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 20.72 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 46. 60 51 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 34 .53 (min) a [RAINFALL DESCRIPTION] Distribution Type = SCS II r Total Precipitation = 5. 60 (in) Return Period = 10 (yr) Storm Duration = 24 . 00 (hr) ar a a a a '• 12 ,.. CASCADIA SUBDIVISION Name: DA-Pond 2 Post-Development 1-Year Type: Computed Flood [HYDROGRAPH INFORMATION] v. Peak Flow (Qp) = 55.41 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 5.16 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Number = 1 Type = SCS Curvilinear Peak Flow (Qp) = 113.73 (cfs) Time to Peak (Tp) = 18. 17 (min) Time of Base (Tb) = 90.84 (min) Volume = 3.80 (ac-ft) Shape Factor = 484 .00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 16.35 (min) ,.. [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] W' Description Area CN Overall Approximation 45.54 77 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 27.25 (min) m' [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 3.40 (in) v. Return Period = 1 (yr) Storm Duration = 24 .00 (hr) WWI ANN AIM wa %.. .. 13 CASCADIA SUBDIVISION Name: DA-Pond 2 Post-Development 1.5-Year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 61.86 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 5.72 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 ... [UNIT HYDROGRAPH INFORMATION] Number = 1 Type = SCS Curvilinear Peak Flow (Qp) = 113.73 (cfs) mew Time to Peak (Tp) = 18.17 (min) Time of Base (Tb) = 90.84 (min) Volume = 3.80 (ac-ft) Shape Factor = 484 .00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 16.35 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 45.54 77 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 27.25 (min) s [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 3. 60 (in) Return Period = 1.5 (yr) Storm Duration = 24 .00 (hr) S S 14 CASCADIA SUBDIVISION Name: DA-Pond 2 Post-Development 2-Year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 65.13 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 6.01 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Number = 1 Type = SCS Curvilinear Peak Flow (Qp) = 113.73 (cfs) +N Time to Peak (Tp) = 18 . 17 (min) Time of Base (Tb) = 90.84 (min) Volume = 3.80 (ac-ft) Shape Factor = 484 .00 Time Step: = 2. 00 (min) Excess Rain = 1.00 (in) Lag Time = 16.35 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 45.54 77 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 27.25 (min) ar [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 3.70 (in) Return Period = 2 (yr) Storm Duration = 24 . 00 (hr) a a a �" 15 CASCADIA SUBDIVISION Name: DA-Pond 2 Post-Development 10-Year Type: Computed Flood [HYDROGRAPH INFORMATION] aa. Peak Flow (Qp) = 131.26 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 11. 91 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 ar. [UNIT HYDROGRAPH INFORMATION] Number = 1 Type = SCS Curvilinear Peak Flow (Qp) = 113.73 (cfs) a.. Time to Peak (Tp) = 18 .17 (min) Time of Base (Tb) = 90.84 (min) Volume = 3.80 (ac-ft) Shape Factor = 484 .00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 16.35 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN ,,. Overall Approximation 45.54 77 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 27 .25 (min) AW [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 5. 60 (in) Return Period = 10 (yr) Storm Duration = 24 .00 (hr) aar aa.. arm a.. 16 CASCADIA SUBDIVISION Name: DA-Pond 2 Post-Development 100-Year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 261.96 (cfs) Time to Peak (Tp) = 728.00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 23. 92 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1. 00 [UNIT HYDROGRAPH INFORMATION] Number = 1 Type = SCS Curvilinear Peak Flow (Qp) = 113.73 (cfs) amis— Time to Peak (Tp) = 18.17 (min) Time of Base (Tb) = 90.84 (min) Volume = 3.80 (ac-ft) Shape Factor = 484 .00 .r. Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 16.35 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] y.. Description Area CN Overall Approximation 45.54 77 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 27.25 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 9. 10 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) a.. `�' 17 . CASCADIA SUBDIVISION RESERVOIR REPORT a Name: Pond 2 (Retention Basin w/Aquatic Bench) ( WATER QUALITY VOLUME REPORT ) ... Name: Pond 2 - Storage [RATING CURVE LIMIT] a Minimum Elevation = 345.00 (ft) Maximum Elevation = 358.00 (ft) Elevation Increment = 0.20 (ft) Av. [STAGE STORAGE INFORMATION] Storage Method: User-Defined Storage a. Input Method: Area Number Elevation Area Ave Area Volume Cumulative a.. Volume (ft) (sq ft) (sq ft) (cu ft) (cu ft) 1 344 . 99 0.00 0. 00 0.00 0.00 •. 2 345.00 28234 .00 14117 .00 141.17 141. 17 3 346.00 30604.00 29419.00 29419.00 29560. 17 4 348. 00 35380.00 32992.00 65984 .00 95544. 17 5 348.50 39242.00 37311.00 18655.50 114199. 67 6 350.00 50655.00 44948.50 67422.75 181622.42 7 352.00 56835.00 53745.00 107490.00 289112.42 8 354.00 60195.00 58515.00 117030.00 406142.42 ..a 9 356.00 64854 .00 62524.50 125049.00 531191.42 10 358.00 69602.00 67228.00 134456.00 665647 .42 11 358.33 76850. 00 73226.00 24164 .58 689812.00 "' Quality Volume Required = 4X(WQ Volume) For 65% Removal Efficiency WQ Volume = (1/2in) /12 X impervious area (Sq. Ft. ) a.. (4) (1/2in) /12 X 451, 761 Sq. Ft. + 300, 000 Sq Ft. (Future Impervious Area) = 125,293.5 Cu. Ft. ... Provided Water Quality Volume (Elev.=351) = 181,622.42 cu. Ft. Pool Depth Zones: Depth Zone Elevation Surface Area Percentage of Wet Storage Area 0' - 1.5' 350.00 - 348.50 11,413 sf. 22.5% a... 1.5' - 2' 348.50 - 348.00 3,862 sf. 7.6% 2' - 6' 348.00 - 345.00 35,380 sf. 69.9% - (Please Refer to Water Quality Calc. on Stormwater Management Plan) a.. m. 18 .. CASCADIA SUBDIVISION RESERVOIR REPORT Reservoir Number: 2 Name: Pond 2 ms [RATING CURVE LIMIT] Minimum Elevation = 344. 50 (ft) Maximum Elevation = 358.33 (ft) ""' Elevation Increment = 0.20 (ft) [STAGE STORAGE INFORMATION] Storage Method: User-Defined Storage Input Method: Area .. Number Elevation Area Ave Area Volume Cumulative Volume (ft) (sq ft) (sq ft) (cu ft) (cu ft) 1 349. 99 0.00 0.00 0.00 0.00 2 350. 00 50655.00 25327.50 253.27 253.27 3 352.00 56835.00 53745.00 107490.00 107743.27 m. 4 354 .00 60195.00 58515.00 117030.00 224773.27 5 356.00 64854 .00 62524 .50 125049.00 349822.27 6 358.00 69602.00 67228.00 134456.00 484278.27 7 358.33 71427.00 70514 .50 23269.78 507548. 06 [RESERVOIR STAGE STORAGE/DISCHARGE] m., Elevation Stage Area Storage Discharge (ft) (ft) (sq ft) (cu ft) (cfs) 349. 90 5.40 0.00 0.00 0.00 "" 350.10 5. 60 50964 .00 5096.40 0.02 350.30 5.80 51582.00 15351.00 0. 10 350.50 6.00 52200.00 25729.20 0. 14 350.70 6.20 52818.00 36231.00 0.18 350. 90 6. 40 53436.00 46856.40 0.21 351.10 6. 60 54054 .00 57605.40 0.23 351.30 6.80 54672.00 68478.00 0.26 351.50 7.00 55290.00 79474 .20 0.28 351.70 7.20 55908.00 90594 .00 0.30 351. 90 7 .40 56526.00 101837.40 0.31 352. 10 7. 60 57003.00 113190.30 0.33 352.30 7. 80 57339.00 124624.50 0.35 352.50 8.00 57675.00 136125. 90 0.36 352.70 8 .20 58011.00 147694.50 0.38 b.. 352. 90 8.40 58347.00 159330.30 0.39 353. 10 8. 60 58683.00 171033.30 0.41 353.30 8.80 59019.00 182803.50 0.42 353.50 9.00 59355.00 194640.90 0.43 ... 353.70 9.20 59691.00 206545.50 0.45 353. 90 9.40 60027.00 218517.30 0. 46 354 .10 9. 60 60427. 95 230562.79 0.47 ,„. 354 .30 9.80 60893.85 242694 . 97 0.48 354 .50 10.00 61359.75 254920.33 0.55 °r 19 CASCADIA SUBDIVISION 354 .70 10.20 61825. 65 267238.87 0. 96 .. 354 . 90 10.40 62291.55 279650.59 1.46 355.10 10.60 62757. 45 292155.49 1.79 355.30 10.80 63223.35 304753.57 2.06 .. 355.50 11.00 63689.25 317444 .83 2.29 355.70 11.20 64155.15 330229.27 2.49 355. 90 11.40 64621.05 343106.89 7.36 356. 10 11. 60 65091. 40 356078. 14 16.09 356.30 11.80 65566.20 369143. 90 32.33 356.50 12.00 66041.00 382304 . 62 55. 40 356.70 12.20 66515.80 395560.30 84 .03 .. 356. 90 12.40 66990. 60 408910. 94 117.83 357. 10 12. 60 67465.40 422356.54 142.00 357.30 12. 80 67940.20 435897 . 10 167 . 11 357.50 13.00 68415.00 449532. 62 195.83 °"' 357.70 13.20 68889.80 463263. 10 228.22 357. 90 13.40 69364. 60 477088.54 264 .35 358. 10 13. 60 70155.03 491040.50 304 .30 .. 358.30 13.80 71261.09 505182. 12 348.14 Maximum Storage = 507322.44 (cu ft) Maximum Discharge = 355.06 (cfs) .. aro .w a. a .. 20 CASCADIA SUBDIVISION OUTLET STRUCTURE REPORT Structure Number : 1 Type : Stand Pipe Name : STAND PIPE [RATING CURVE LIMIT] Minimum Elevation = 344 .50 (ft) Maximum Elevation = 358.33 (ft) Elevation Increment = 0.20 (ft) [STAND PIPE INFORMATION] Ma [ORIFICE INFORMATION] Diameter = 5.00 (ft) Crest Length = 15.71 (ft) Effective Crest Length = 15.71 (ft) Orifice Coefficient = 0. 60 Fractional Open Area = 1.00 .. [ORIFICE EQUATION] Q = Co*A( (2gh) /k) ^0.5 [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (sq ft) [WEIR INFORMATION] Crest Elevation = 355.70 (ft) Weir Coefficient = 3.33 Exponential = 1.50 [WEIR EQUATION] Q = Cw * L * H^exp [DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert ft «.. L = Crest lenght ft [OPTIONAL ORIFICE INFORMATION] Type : Circular Orifice [OPTIONAL ORIFICE INFORMATION] «.. Diameter = 0.25 (ft) Invert Elevation = 350.00 (ft) Orifice Coefficient = 0. 60 Number of Openings = 1 [ORIFICE EQUATION] Q = Co*A( (2gh) /k) ^0.5 21 CASCADIA SUBDIVISION [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (cfs) k = 1 ■. Structure Number : 2 Type : Circular Orifice [OPTIONAL ORIFICE INFORMATION] Diameter = 0.50 (ft) Invert Elevation = 354 .40 (ft) Orifice Coefficient = 0. 60 Number of Openings = 2 [ORIFICE EQUATION] Q = Co*A( (2gh) /k) ^0.5 [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (cfs) k = 1 [CULVERT INFORMATION] Type : Circular Concrete - Square Edge with Headwall [OUTLET STRUCTURE INFORMATION] '•" Diameter = 30.00 (in) Invert Elevation = 346.00 (ft) Pipe Length = 75.00 (ft) .,. Slope = 0.02 Manning's n Value = 0.01 Orifice Coefficient = 0. 60 Tailwater Elevation = 344 .58 (ft) Number of Barrels = 1 [UNSUBMERGED EQUATION] H/Diam = Hc/Diam+K* (Q/ (A*Diam^0.5) ) ^M-0.5*S Coefficient K = 0.01 Coefficient M = 2.00 Q Maximum = 27.16 [SUBMERGED EQUATION] H/Diam = c* (Q/ (A*Diam^0.5) ) ^2+Y-0.5*S Coefficient c = 0.04 Coefficient Y = 0. 67 Q Minimum = 31.05 .. [DEFINITIONS] H = Headwater depth above inlet control section invert, (ft) Diam = Interior height of culvert barrel, (ft) He = Specific head at critical depth (dc+Vc^2/2g) , (ft) f Q = Discharge, (cfs) A = Full cross sectional area of culvert barrel, (sq ft) S = Culvert barrel slope, (ft/ft) 22 .- CASCADIA SUBDIVISION [STAND PIPE STAGE VS. DISCHARGE] Elevation Stage Weirs Orifices Stand Pipe Culvert Total (ft) (ft) (cfs) (cfs) (cfs) (cfs) (cfs) 349. 90 5.40 0.00 0.00 0.00 36.88 0.00 350.10 5. 60 0.00 0.02 0.00 38 .48 0.02 350.30 5.80 0.00 0.10 0. 00 40.03 0.10 .. 350.50 6.00 0.00 0. 14 0.00 41.51 0. 14 350.70 6.20 0.00 0.18 0.00 42. 95 0. 18 350. 90 6.40 0.00 0.21 0.00 44 .33 0.21 ,® 351.10 6. 60 0.00 0.23 0.00 45. 68 0.23 351.30 6.80 0.00 0.26 0.00 46. 98 0.26 351.50 7.00 0.00 0.28 0.00 48.26 0.28 351.70 7.20 0.00 0.30 0.00 49.50 0.30 mw 351. 90 7 .40 0.00 0.31 0.00 50.70 0.31 352.10 7 . 60 0.00 0.33 0. 00 51.88 0.33 352.30 7.80 0.00 0.35 0.00 53.04 0.35 352.50 8.00 0.00 0.36 0.00 54 . 17 0.36 352.70 8.20 0.00 0. 38 0.00 55.27 0.38 352. 90 8.40 0.00 0.39 0.00 56.36 0.39 353. 10 8. 60 0.00 0.41 0.00 57.42 0.41 ... 353.30 8.80 0.00 0.42 0.00 58.47 0. 42 353.50 9.00 0.00 0.43 0.00 59.49 0.43 353.70 9.20 0.00 0.45 0.00 60.50 0.45 353. 90 9.40 0.00 0.46 0. 00 61.50 0.46 354 . 10 9. 60 0.00 0.47 0.00 62.47 0.47 354 .30 9.80 0.00 0.48 0.00 63. 43 0.48 354 .50 10.00 0.00 0. 55 0.00 64 .38 0.55 ,4„ 354 .70 10.20 0.21 0. 96 0.00 65. 31 0. 96 354 . 90 10.40 1.09 1.46 0.00 66.24 1 .46 355.10 10. 60 2.35 1.79 0.00 67.14 1.79 355.30 10.80 3. 90 2.06 0.00 68.04 2.06 "" 355.50 11.00 5. 69 2.29 0.00 68. 92 2.29 355.70 11.20 7. 68 2.49 0.00 69.80 2.49 355. 90 11.40 9.87 2. 68 4 . 68 70. 66 7.36 356. 10 11. 60 12.24 2.85 13.23 71.51 16.09 356.30 11.80 14.76 3.01 24. 31 72.35 27 .33 356.50 12.00 17.44 3. 17 37.43 73. 18 40. 60 356.70 12.20 20.27 3.31 52.31 74 .01 55. 62 .. 356. 90 12.40 23.23 3. 45 68.76 74 . 82 72.21 357 . 10 12.60 26.33 3.58 86. 65 75. 62 75. 62 357.30 12.80 29.55 3.71 101.22 76. 42 76.42 mw 357.50 13.00 32.89 3.83 114 .58 77.21 77.21 357.70 13.20 36.35 3. 95 127. 94 77 . 99 77. 99 357. 90 13. 40 39. 93 4.07 140. 17 78.76 78 .76 358.10 13.60 41.75 4 .18 146. 40 79.53 79.53 ow 358.30 13. 80 0.00 4 .29 152.38 80.28 80.28 358 .33 13. 83 0.00 4 .30 153.26 80. 40 80.40 MOO ... 23 ... CASCADIA SUBDIVISION OUTLET STRUCTURE REPORT Type : Trapezoidal Weir Name : Weir [RATING CURVE LIMIT] Minimum Elevation = 356.00 (ft) Maximum Elevation = 358.33 (ft) Elevation Increment = 0. 10 (ft) [OUTLET STRUCTURE INFORMATION] m. Crest Length = 16.00 (ft) Angle of Walls = 157.0000 Crest Elevation = 356. 10 (ft) +r Weir Coefficient = 3. 33 Exponential = 1.50 [TRAPEZOIDAL EQUATION] m. Q = Cw * ( L + 0.8H * tan ( ang/2. 0 ) ) * H^exp [DEFINITIONS] ... Cw = Weir Coefficient H = Headwater depth above inlet control section invert L = Crest lenght ang = Angle of the walls [MAXIMUM DISCHARGE] Q = 274 . 67 (cfs) [WEIR STAGE VS. DISCHARGE] Elevation (ft) Stage (ft) Discharge (cfs) 356.10 0.10 0.00 356.20 0.20 1.73 356.30 0.30 5.00 356.40 0.40 9.40 m. 356.50 0.50 14.80 356.60 0.60 21.15 356.70 0.70 28.41 m. 356.80 0.80 36.57 356.90 0.90 45.62 357.00 1.00 55.55 357.10 1.10 66.37 m.. 357.20 1.20 78.09 357.30 1.30 90.69 357.40 1.40 104.20 357.50 1.50 118.62 mew 357.60 1. 60 133. 96 357.70 1.70 150.23 357.80 1.80 167.44 357.90 1.90 185.59 358.00 2.00 204.69 358.10 2.10 224.77 358.20 2.20 245.82 358.30 2.30 267.86 m. 358.33 2.33 274.67 24 IS ... CASCADIA SUBDIVISION Name: Routing - Pond 2 1-Year Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 0.45 (cfs) Time to Peak (Tp) = 1462.00 (min) Time of Base (Tb) = 2880.00 (min) Volume = 1.25 (ac-ft) A. Time Step = 2.00 (min) Peak Elevation = 353.69 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Number = 2 Name = Pond 2 w.. Storage Type = User-Defined Area Maximum Storage = 507322.44 (cu ft) Maximum Discharge = 355.06 (cfs) A.. [INFLOW HYDROGRAPH INFORMATION] Number = 21 Name = Pond 2 Post 1-Year Peak Flow (Qp) = 55.41 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 5.16 (ac-ft) Flow Multiplier = 1.00 .rr a a a. a "" 25 VON CASCADIA SUBDIVISION Name: Routing - Pond 2 1.5-Year Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 0.47 (cfs) Time to Peak (Tp) = 1464 .00 (min) Time of Base (Tb) = 2880.00 (min) Volume = 1.32 (ac-ft) Time Step = 2.00 (min) Peak Elevation = 354.09 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Number = 2 Name = Pond 2 .. Storage Type = User-Defined Area Maximum Storage = 507322.44 (cu ft) Maximum Discharge = 355.06 (cfs) [INFLOW HYDROGRAPH INFORMATION] Number = 4 Name = Pond 2 Post 1.5-Year Peak Flow (Qp) = 61.86 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 1529. 85 (min) Volume = 5.72 (ac-ft) Flow Multiplier = 1 .00 ..r .. S S S 26 �.. CASCADIA SUBDIVISION Name: Routing - Pond 2 2-Year Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 0.48 (cfs) Time to Peak (Tp) = 1464 .00 (min) Time of Base (Tb) = 2880.00 (min) Volume = 1.36 (ac-ft) "" Time Step = 2.00 (min) Peak Elevation = 354.28 (ft) Detention Time = NA AMP [RESERVOIR STRUCTURE INFORMATION] Number = 2 Name = Pond 2 Storage Type = User-Defined Area Maximum Storage = 507322.44 (cu ft) Maximum Discharge = 355.06 (cfs) [INFLOW HYDROGRAPH INFORMATION] Number = 5 Name = Pond 2 Post 2-Year — Peak Flow (Qp) = 65. 13 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 6.01 (ac-ft) Flow Multiplier = 1.00 MIN IMP +r 27 �. CASCADIA SUBDIVISION Name: Routing - Pond 2 10-Year 'f Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 8.41 (cfs) Time to Peak (Tp) = 854 . 00 (min) Time of Base (Tb) = 2880.00 (min) Volume = 6.44 (ac-ft) Time Step = 2.00 (min) Peak Elevation = 355. 92 (ft) Detention Time = NA ow [RESERVOIR STRUCTURE INFORMATION] Number = 2 Name = Pond 2 Storage Type = User-Defined Area Maximum Storage = 507322. 44 (cu ft) Maximum Discharge = 355.06 (cfs) ow [INFLOW HYDROGRAPH INFORMATION] Number = 6 Name = Pond 2 Post 10-Year Peak Flow (Qp) = 131.26 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 11. 91 (ac-ft) "' Flow Multiplier = 1.00 MOS Vaat WNW .rr ar I'" 28 CASCADIA SUBDIVISION Name: Routing - Pond 2 100-Year Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow (Qp)f.. = 158. 91 (cfs) Time to Peak (Tp) = 742.00 (min) Time of Base (Tb) = 2880.00 (min) Volume = 18.44 (ac-ft) Time Step = 2.00 (min) Peak Elevation = 357.23 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Number = 2 Name = Pond 2 1110 Storage Type = User-Defined Area Maximum Storage = 507322. 44 (cu ft) Maximum Discharge = 355.06 (cfs) [INFLOW HYDROGRAPH INFORMATION] Number = 7 Name = Pond 2 Post 100-Year �,. Peak Flow (Qp) = 261. 96 (cfs) Time to Peak (Tp) = 728 .00 (min) Time of Base (Tb) = 1529.85 (min) Volume = 23. 92 (ac-ft) ." Flow Multiplier = 1.00 VIM MIN ' 29