Loading...
HomeMy WebLinkAboutWPO201600011 Plan - E&S 2016-03-18 EROSION AND SEDIMENT CONTROL NARRATIVE FOR Harvest Moon March 18, 2016 LOCATION: TM 45-112G Albemarle County, Virginia OWNER: HG Land, LLC 109 Blueberry Rd Charlottesville, Virginia 22901 PREPARED BY: Dominion Engineering & Design, LLC 172 South Pantops Drive z Charlottesville, VA 22911 Eo r,. P: 434.979.8121 �` / �_ F: 434.979.1681 © MICHA �F Mdir YERS j• • Li a.33028 • V),) Total disturbed area = 2.39 acresorsr-14+4444-Or \L ,.. Al. PROJECT DESCRIPTION: The purpose of this plan is to build a catering building with an expanded internal road with parking, stromwater pipes and a sanitary sewer connection. The building will be 214' by 60'. The internal road will connect to the shared parking lot of the existing Medical Spa. project. The total disturbed acreage for this project is 2.39 Acres. A2. EXISTING SITE CONDITIONS: The project site is located at 3350 Berkmar Drive in Albemarle County, situated on property previously occupied by Adventure Land: Family Fun Park, also known as Planet Fun. The existing Albemarle Dermatology and Signature Medical Spa Building site occupies about 0.7 acre of the portion of the property fronting Berkmar Drive. The remaining 4.17-acre portion of property proposed for development wraps around three sides of the existing building site. The project site slopes from Berkmar Drive, moderately downward to the east. Ground surface grades vary from about EL 510 at the existing parking lot next to Berkmar Drive to about EL 476 along the east property line. The site proposed for development includes a current phase (Phase 1) and a future phase (Phase 2). Much of the Phase 1 area is occupied by an abandoned go-cart facility, which includes a deteriorating concrete-paved race track, a race car staging and service area, support buildings, and stormwater management structures. Previously landscaped areas on the site are now overgrown with trees and heavy brush. The Phase 2 area is occupied by the previous miniature golf course and parking areas. 63. ADJACENT AREAS: The site is bounded to the west and south by Berkmar Dr. and the University of Virginia Employee Credit Union. The East and Northern part of the site is bound by Kegler's Bowling Alley and a residential parcel 45-112. Access to the site is proposed through the parking lot of the site with no access easement necessary. To the east is a wooded parcel that will remain undisturbed. To the south is an existing dry detention pond serving around 60+ acres of drainage area. No disturbance is proposed outside of the subject property. No adverse impacts are anticipated to any of the adjacent areas. Adequate maintenance of the proposed erosion and sediment control practices will minimize the chances for downstream sedimentation of the outfall intermittent stream. B4. SOIL DESCRIPTIONS: The site consists of B soils only, with a bit of road fill located adjacent on the northwest edge of Berkmar Dr. Refer to separate soils report included as part of this E+S narrative. B5. CRITICAL AREAS: The only critical areas for this site are some managed critical slopes that are located on the southeast portion of the site. These critical slopes will be maintained with exception of an area that will be graded to make room for the proposed building. 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. 1 SAFETY FENCE (SAF)—3.01 Safety fencing is a protective barrier installed to prevent access to an erosion control measure or to prohibit the undesirable use of an erosion control measure by the public. TEMPORARY CONSTRUCTION ENTRANCE (CE) —3.02 A construction entrance shall be provided 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 wash area is not adequate in sediment removal. Sediment-laden runoff is to be directed towards the sediment basin. SILT FENCE AND SUPER SILT FENCE (SF) (SFF) —3.05 Silt fencing will be installed as a first step in construction activities. Location and details are shown on the plans. 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. 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 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. B7. PERMANENT AND TEMPORARY STABILIZATION: 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. Contractor may use a 50/50 mix of Annual Ryegrass and Cereal (Winter) Rye spread at a rate of 100 lb/acre, or choose an alternate from Table 3.31-C of the Virginia Erosion and Sediment Control Handbook. It is anticipated that the sitework for Harvest Moon will commence within one year of breaking ground. For this reason, temporary seeding is recommended. MULCHING — 3.35 2 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. PERMANENT SEEDING —3.32 (OPTIONAL) 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. Use a mixture of Kentucky 31 Fescue (108 lbs), Red Top Grass (2 lbs), Annual Rye (20 lbs) and Crown vetch (20 lbs) or other approved permanent seeding mixture in Specification 3.32. B8. SOIL STOCKPILES AND BORROW AREAS A designated area for soil stockpiling within the limits of construction if required shall be coordinated prior to commencement of construction. B9. OFF-SITE AREAS: It is not anticipated that off-site soil disposal areas will be needed for this project. There will be a private 20' sanitary sewer easement from our site through the Kegler's site and attaching to an existing sanitary sewer and easement pipe network. B10. STORM WATER MANAGEMENT: Stormwater management water quality is being treated with offsite nutrient credits. A letter of availability has been provided on SW08. Stormwater quantity requirements will be hanlded by the existing Kegler's pond downstream since there is a net loss of impervious surface for Phase 1 of this project. 1311. MAINTENANCE SCHEDULE: A program of maintenance for the erosion and sediment controls specified in this narrative and shown on the plans will be the responsibility of the landowner and 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 after a rainfall runoff producing event 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. For any sediment that is to be spread on site, contractor to ensure the spread location contains the sediment such that it does not readily flow back to control structures or off-site. 3. Gravel outlets, if provided, 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. 3 7. After construction operations have ended and disturbed areas have been stabilized, all berms and sediment-trapping devices, including the temporary culvert crossing may be removed, after removal the ground shall 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 E&SC Inspector. B12. CONSTRUCTION SEQUENCE: Anticipated Start Date: October 1, 2016 Anticipated Completion Date: October 1, 2017 Phase 1 1. Install paved construction entrance at site entrance adjacent top parking lot. Provide connection to public water source and provide a 1" hose connection to clean construction vehicles as they leave the site. Install diversion dike along roadway and sediment trap to direct wash water to sediment trap. 2. Contractor to block existing Drop Inlet 4. 3. Provide inlet protection for existing inlets to remain in place as shown. 4. Install perimeter silt fence and remainder of diversions as shown. 5. Remove existing hardscapes as indicated on SW03 of the VSMP Plan. 6. Once curbing is installed the diversion dikes may be removed as the curb's will act as the diversion. 7. Bring site to final grades and stabilize with permanent seeding. B. 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: 4 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. 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: 5 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 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. For this project, no impervious area is proposed and therefore no increase in runoff is anticipated following completion of the archaeological survey. 6 Afif COUNTY OF ALBEMARLE Community Development 401 McIntire Road Charlottesville,Vriginia 22902-4596 (434)296-5832 EROSION CONTROL PERMIT Date of Application: 02/19/2016 Permit Effective Date: 06/24/2016 Number: WPO-2016-00011 LANDOWNER: HG Land LLC Phone 4342969091 109 Blueberry Rd. Charlottesville,VA22901 CONTRACTOR: Donalson Construction Company Phone: (540)729-3134 24 Canterbury Rd. Charlottesville,VA22903 REPONSIBLE LAND Edward Lee Donalson Phone: (540)729-3134 DISTURBER: 30571 Portobago Trl Port Royal,VA22535 Certification/License#: 0402005017 Type: Professional Engineer Plans Prepared By: Dominion Engineering Plans Dated: 02/19/2016 Last Revised: 05/17/2016 Plans Entitled: VSMP Plan(WP0201600011)For Harvest Moon-Phase Location: 1 Dist. 2.39 Acreage: Tax Map: 04500-00-00-112G0 Hydrological JR08 Unit: Issued By:Kenny Thacker Title:Erosion Control Officer Signature Date