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HomeMy WebLinkAboutWPO201600064 Checklist WPO VSMP 2014-03-05 1 ‘0r/' Albemarle County Engineering Erosion and Sediment Control Plan checklist for plan reviewers 5 Mar 2014 (Use the latest checklist from the Team Services engineering forms site) An erosion and sediment control plan is a document which illustrates the measures used to control erosion and sedimentation during construction. All measures follow the Virginia Erosions and Sediment Control Handbook. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references, and(regular parenthesis)are explanatory. Links to reference documents are provided where possible. Apation information: Completed WPO application and fees, with owners signature [County Code 18-32.4.3.2, 18-32.3.9, 17-203, 17-303] Erosion Control plans require a Water Protection Ordinance (WPO) application and original owner's signature. No review is provided without application, owner signature and fees. This is true even for revisions. It is important that the owner be aware of comments and resubmittals, and this is the county assurance. Copies of federal and state permits for any wetland or stream disturbance. (Army Corps, { VDEQ, etc) [17-312A,B, 17-319B,D, 17-320C,D, 18-32.1.2, 14-311] Title information: Project title. Titles should be appropriate. It should be an erosion control plan, not a rS 4 stormwater plan, or site plan, etc. In some cases a WPO package will contain a Cp ' stormwater plan and a mitigation plan,but they should be on separate sheets with keys ✓ and page titles. Professional seal, with original signature and date for professionally prepared plans. Content: The erosion control plan must not contain information regarding permanent improvements that do not also appear on other plans. Erosion control plans are temporary documents that are discarded after projects are complete. Existing conditions plan view information: 0 ace ' accurate current existing topography at the time of submittal, including all existing site features, and any recent disturbances, all at a legible scale Vdate and source of the topographic information: All topography should be at least visually field verified by the designer within the last year WPO buffer limits; 100' from stream or wetland bank, 200' from reservoirs, or floodplain limit if greater. No buffter disturbances without WPO Program Authority approval and a mitigation plan. //I floodplain limits, including 100yr flood limits for any channel with a drainage area of 50+acres. �(i4 Floodplain undisturbed. Disturbances require a Special Use Permit or Floodplain Development Permit. i,4 all existing easements (access, drainage, sight, sanitary easements, etc.) with deed book references, locations and dimensions 1 k all critical slopes (typically shaded) T I((k Zoning Ordinance buffers shown and protected undisturbed. Disturbances require Planning approval of a waiver. 7 9 IIIII 4 Albemarle County Engineering E&SC Plan Checklist Page 2 of 4 Proposed plan view information: Grading: [18-32.6.2, 14-303] v proposed topography at minimum 2' contour intervals—tied into existing contours, as well as all proposed site features. (Sites with less than 6' of grade change should consider using smaller contour intervals.) These should agree with other final plans. proposed slopes are all 2:1 (horizontal:vertical) or flatter {Design Manual, section 8} pi II k- proposed slopes steeper than 3:1 have low maintenance(not grass) ground cover specified on the plan {Design Manual, Section 8} existing critical slopes are not disturbed,unless a waiver or exemption has been granted \ for the disturbance. [18-4.2, 14-304] Retaining Wall Plans approved. Any walls supporting roads or necessary infrastructure require engineered plans (not generic manufacturer's details) and computations. {Design Manual, section 8} This will also be required where walls are close to property lines and there is the danger of affecting neighboring property, either during construction, with later failures, or with pedestrian or vehicle safety. final contour shapes and slopes ensure no undrained pockets or stagnant pools • Narrative: narrative and project title (Narratives are now optional, and not reviewed by the County, • other than noting whether they are not seriouly in error, like a boilerplate with another County's name on it.) ✓ project description v/ existing site conditions description adjacent areas description doff site areas description including any off-site areas for borrow, waste or other disturbance. special use permit for cut greater than 50,000cy in RA zoning ✓ soils descriptions ever Shoat. County erosion control notes stormwater runoff considerations: this can refer to the stormwater management plan rl ft sediment basin design computations summary for each sediment basin iNk - —,0 sediment trap design computation summary for each sediment trap ro talcs Erosion and sediment control measures: ✓ limits of clearing and grading encompassing all disturbances, entrances, staging and parking areas, areas where sediment laden runoff will cross, or any construction related activities. This must match any landscaping and conservation plans submitted with site r)419' plans \/. a construction entrance(CE) draining to a sediment trap or basin dust control symbols (DC) temporary and permanent seeding symbols (TS, PS) existing drainage divides Sou ✓ existing vegetation, with trees to be saved located by drip lines. This must match any a. a landscaping and conservation plans. protection provided for all stages/phase of construction, from initial land clearing to anal rades and hardscapes. This is our most important item. Plans which show only Albemarle County Engineering E&SC Plan Checklist Page 3 of 4 inlet protection on proposed drainage systems, which are only possible to install upon completion of grading, should be denied without further review. no erosion control measures in the way of construction access or grading. Diversion Q dikes or silt fence are not placed in the middle of the site, or through access or grading. k vk-5 Sediment traps are not under or on top of fill material or held up by retaining walls. \ Construction entrances are not on fill, etc.If the concept for site protection is not adequate in this regard,further review of the plan may not be possible. existing soil boundaries are shown with labels. Areas already disturbed are indicated, with constructed fill depth or cut noted. (Pr critical erosion areas are identified; areas of constructed slopes, areas near property lines k adjacent off-site disturbances are shown with erosion control facilities a stockpile location. o ? ,' 0/k- where cut or fill balances have a 10,000 cubic yard deficit or more, plans should not be approved without a waste area identified. This must a on-site, or on another approved and ��1,? permitted site. (Don't make the inspectors chase trucks to find the violation.) a staging and parking area, or other construction related areas �-� diversion dikes are used to direct drainage to traps and basins Wih silt fence is not used across contours in place of diversion dikes. t)S c/ silt fence is limited to areas of sheet flow with '/ acre per 100ft of level on-grade silt fence. Plans showing only silt fence, without sediment trapping measures, should not be approved unless they meet this criteria and fill dirt is minimal. r 11 0 all swales and low points at the perimeter of the site have a sediment trap or basin. Silt V'"- vh 11 4 fence in swales is typically not adequate. Check dams do not substitute for traps. If the o&'j ' concept for site protection is not adequate in this regard,further review of the plan may not be possible. pc temporary slope drains (TSD) or diversions are provided to prevent discharge over disturbed or fill slopes ✓ inlet protection (IP) on all inlets f culvert inlet protection(CIP)on all culvert inlets outlet protection(OP)on all outlets all watercourses are protected and encroachments minimized /"C,4- stream crossing(USC,SC) and diversions are provided at all stream crossings. c) adequate channels (MS-19)provided for each outfall (see Design Manual for minimum content) ---- all traps and basins are shown with proposed contours. Simple boxes or symbols are not sufficient, in most cases, to determine layout or bond amounts. Fore h trap; drainage area is 3 acres or less sized for total drainage area, including those for in-line upstream facilities wet storage is 67cy or more dry storage is 67cy or more ��� wet storage is 4' deep or less r wet storage side slope is 1:1 or flatter 0`'1.)rO`nOk,G dry storage side slope is 2:1 or flatter ` A\Gc stone weir is 6ft per acre of drainage area C, embankment and stone weir height is 5' maximum from outside toe embankment top width is adequate(see table 16 reference) 2:1 length:width ratio for flow path S Albemarle County Engineering E&SC Plan Checklist Page 4 of 4 lv For each basin; (GB 3.14) sized for total drainage area, including those for in-line upstream facilities wet storage is 67cy or more dry storage is 67yr or more wet storage side slope is 1:1 or flatter dry storage side slope is 2:1 or flatter embankment 15' high or less from downstream toe principle and emergency spillways sized per handbook requirements embankment has 1' freeboard during 25yr storm with emergency spillway embankment has 2' freeboard during 25yr storm without emergency spillway trash rack/ anti-vortex device specified per handbook requirements riser anchor size specified per floatation computation dewatering device sized for 6+hr drawdown of dry storage: 3"dia. minimum safety fence and signs stating"danger, quick sand, do not enter"provided if near any residential properties, or public access structures and embankment match permanent design for facilities to be converted to permanent stormwater management facilities embankment top width is adequate (see Design Manual reference details) 2:1 length:width ratio for flow path. If necessary,baffles specified only on temporary structures(p.III-79) Details: I/k a paved construction entrance detail (see Design Manual reference details) for projects in the development areas over 10 acres - a typical section for each temporary channel or diversion,referenced from the plan ' sheets. Existing ground should be shown at the maximum cross-slope on the plan. details and copies of Program Authority permissions for any variances. Mass or Early Grading: mass grading Planning approval. (This is also called rough or early grading plans which contain only approximate finished grades and culverts necessary to grade) Mass grading can only be permitted within planned developments where a concept grading plan was approved with the rezoning. The agent (Director of Planning) needs to formally determine that the grading plan is in general conformity with the approved rezoning plan. Otherwise, an initial site plan needs to be approved prior to issuance of a grading permit. Issuance of a grading permit at the initial site plan stage, as apposed to after final plan approval,requires specific approval from the County Engineer. } • r Albemarle County Engineering Drainage Plan checklist for plan reviewers 18 Feb 2014 (Use the latest checklist from the Team Services engineering forms site) A drainage plans is typically a component of a road plan, site plan,or stormwater management plan. It consists of the channel,ditch, culvert,or stormsewer design drawings,drainage maps, and computations for hydrology and hydraulics. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references,and(regular parenthesis)� tare explanatory. Links to reference documents are provided where possible. V A professional seal should be provided for any computation packages where are separate from sealed plans. Drai ge: [18-32.6.2d, 14-305, 311] drainage area maps(This is a basic element, and without this there is no review) drainage computations(usually in the form of tables from the VDOT Drainage Manual App. 9B-1 LD-2014,App.7B-1 LD-268, App., App.8B-1 LD-269, etc. -computations are ✓ a basic element, and without them there is no review) all proposed and existing storm sewer must be shown in plan view /4/1\ for residential:development, principle access free of flooding during the 25yr storm [14- 410] Q) site runoff and entrances do not drain into streets (from VDOT Drainage Manual 9.4.5.2, 9.4.6.2) t/ concentrated runoff(1 cfs or greater) does not run across travelways/streets (as above' ? following VDOT design) OtArAlkr drainage does not run across, through, or backwater in dumpster areas [18-4.12.19] .✓ overland relief is provided for any drainage structure or inlet in case of clogging. The failure of any system will not cause structures, streets or yards to flood. {Policy} direction of flow change(or deflection angle)in each drainage structure is 90 degrees or greater(flow should not have to reverse direction) (from guide of VDOT Drainage / Manual 9.4.9.3.2.3) <\/ labels on all drainage structures provided (and should match the drainage computations and profiles) of A- provisions and easements for drainage across 3 or more lots. Dense development where fencing, decking, etc is expected should provide yard inlets and pipes in easements, rather than ditches {Policy} Drainage profiles: (applicable to site plans, road and drainage plans) [14-311, 18-32] drainage profiles for each pipe, structure or channel must contain: existing ground proposed ground ✓ any channel linings NIA all utility crossings -- ' a VDOT designation (MH-1, DI-3B, etc.) for each structure throat length for each drop inlet P)/,A grate type for each grate inlet \/ a label on each structure to correspond with the computations • • e • , •, �.. dr-A0 rl Albemarle County �� C (€-F- C&SL Engineering Drainage Plan Checklist P Page 2 of 2 material and strength class or gage of each pipe (J(A- manhole access every 300' for 15"-42"or 800' for 48" or greater pipe slopes at 0.5%min. to 16%max. (per VDOT stnds for anchors over 16%) NIA' concrete inlet shaping(IS-1) specified on any structure with a 4' or greater drop /V j k safety slabs (SL-1) in any structure taller than 12'. top or rim elevation for each structure all invert elevations for each structure(with positive flow drop between inverts). end sections (ES-1)or endwalls (EW-1)on all pipe outlets. Endwalls for culverts 48" or taller (0 b( Li scour outlet protection at all outlets, corresponding to computations (Green Brook, OP) Drainage computations: (applicable to any plan proposing pipes, channels, etc.) Q Pipe computations for all pipes All proposed systems are designed within open channel flow capacities. (HGL af- 7 computations are not necessary, and should not be relied upon unless the entire system is to be watertight.) For systems within drainage easements, all proposed pipes are a minimum 15" in diameter There are no excessive outlet velocities (> 15fps) /0(7- Curb inlet computations for any curb inlets on grade All spreads are less than 10' carryover is accounted for 100% capture at entrances so no flow runs out entrances into travel lanes 100%capture, or overland flow of capacity storm, to stormwater management facilities. Typically stormwater management is designed to the 1Oyear storm, and /� inlets on grade cannot capture this. J0 1/ ` Curb inlet computations for any curb inlets in sump conditions All flow depths are below 6" in the capacity table All spreads are less than 10' J 100% capture to stormwater management facilities joiite_ Ditch computations for any ditches ditch linings specified per plans meet velocity requirements ✓ ulvert computations for any culverts headwaters< 1.5 x culvert height, and 18"below shoulder elevation of streets. �,(J Outlet protection computations for all outlets dimensions and stone sizes for all outfalls \/- inlet drainage area_ Proposed pipe andmap limits of all areas and sub-areas draining to proposed structures, and existing structures or channels which will be impacted acreage of each drainage area as used in computations hydrologic coefficient for each drainage area as used in the computations time of concentration for each drainage area as used in the computations destination structure labeled for each drainage area(if not obvious) CONTENTS: (from Albemarle County Code Sec. 17-405) 1. Registration statement \ L/ 2. Notice of general permit coverage Vlo+ I V1 flP e v-P Eature of activity rosion and Sediment Control Plan. `5! ormwater Management Plan `4ollution Prevention Plan. L7Discharges to impaired waters, surface waters within an applicable TMDL wasteload allocation, llocation , and exceptional waters. 0'10( �1!/ Qualified personnel ti : gned Certification o !. Delegation of authority. / c 1 General permit copy -- (Av+ ((� `4 y\'er,� V 12. Inspection logs Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County • '*4411101 \r\ \\ Loo(“k. cm (1\urciil — SM \ _/cDv\fooktA..c) oirw JcSM Pict r) < L4J 0 ) KvV (rN (d rFe) kt S \f\•e v-e CO 1A OLO1 ci PS F A-) S(Ote„ (4A ( Aik L- ph s+ `---trJcje jti ? 0 j ' _ f , 1-C444._ (. Prfcr_t 41orl *al - fPMOO ? . 1'e) DO S T 110 - TC IP off, PA A --511p`e' (- Pi a 6-Le. yr 4 ( Gt.o u..7-4 ...- . w\r\iA.A 2 • : , . ., . . , . ,: I stool Page 1 of 5 Version:February 2,2015 PLAN SUBMITTER'S CHECKLIST FOR STORMWATER MANAGEMENT PLANS Please fill in all blanks and please reference the plan sheets/paaes where the information may be found, where appropriate,or write N/A by items that are not applicable. GENERAL J Plan Submission Date /�///A10 Project Name /14-P5-71!1-1,/t' 7-Eg- VSMP Permit Number Site Plan Number�� litl')-20)10- Site ?.0)(o- Site AddressOA/Fe/4- f i , 07-4, JJA- •?2-147 ��' 0, Applicant 4/ enf 3-' z+��Z�Z Phone Number .131'-7,,O 23&2 Applicant Legal Address 1 Zly�'H 7 07.610,4-2-*2 Owner ' Phone Number Owner E-mail Address ,-006-2?-6:7-120-3,��,"/ZAP Principal Designer EA I-�,4j > Phone Number Principal Designer E-mail Address PIP:, e L!vim. LC*P 1 Total Disturbed Area Figure Z.O() V Professional's seal - The designer's original seal, signature, and date are required on the cover sheet of each Narrative and each set of Plan Sheets. A facsimile is acceptable for subsequent Plan Sheets. 1/ Number of plan sets-Attach two sets of SWM Plans. 1\0k Exceptions - Exceptions requested are governed by Section 9VAC25-870-57 of the Virginia Stormwater Management Regulations. / Local Consideration-Provide contact information for the locality's plan review coordinator. Name t - 111 L7 19X Phone Number 3L- Address ) /)�ei ht-6 4pop, 22-7 z41,1.%�V j Vy M J 4- 22-91:2_ Grandfathering - Attach supporting documentation consistent with the requirements of Section 9VAC25-870-48 of the Virginia Stormwater Management Regulations. Offsite Compliance - Attach letter of availability from the off-site provider as governed by Section 9VAC25-870-55 of the Virginia Stormwater Management Regulations. PROJECT NAME: fi4,1!-t{Z 3 A4 tet' c -- SUBMITTAL#: 2- DI DI A 1►TQ n A TL,il. 12-/) )k stiod Nos"` Page 2 of 5 Version:February 2,2015 CHECKLIST PREPARER I certify that I am a professional in adherence to all minimum standards and requirements pertaining to the practice of that profes •• in accordance with Chapter 4 (§ 54.1-400 et seq.)of Title 54.1 of the Code of Virginia and atten a . F lations. By • his checklist I am certifying that this document and all attachments are,to 9:st of y o le'ge an' belief,true,accurate,and complete. SIGNATURE PRINTED N I: � ,' (Ai)1 4 QUALIFICATIONS re_ . 02 -68/0 DATE )41rittO PROJECT NAME: (A/ /4-1-7-1 -7;;(1-1-1 l-IV7 - SUBMITTAL#: 2 04 ANQ 111iTL'71. /Z/)2_ )I Page 3 of 5 Version:February 2,2015 SITE PLANS Please reference the plan sheet numbers where specific information may be found in the blanks below. Common address and legal description of the site, including the tax reference number(s) and parcel number(s)of the property or properties affected. A narrative that includes a description of current site conditions and proposed development and final site conditions, including proposed use of environmental site design techniques and practices, stormwater control measures, relevant information pertaining to long-term maintenance of these measures,and a construction schedule. )existing and proposed mapping and plans (recommended scale of 1" = 50', or greater detail), which illustrates the following at a minimum: lel North arrow [ Legend [Vicinity map Eipcisting and proposed topography(minimum of 2-foot contours ffProperty lines 'Perennial and intermittent streams [Mapping of predominant soils from USDA soils surveys as well as the location of any site- specific test bore hole investigations that may have been conducted and information identifying the hydrologic characteristics and structural properties of soils used in the installation of stobwater management facilities oundaries of existing predominant vegetation and proposed limits of clearing and grading [Q/Location and boundaries of natural feature protection and conservation areas (e.g.,wetlands, lakes, ponds, aquifers, public drinking water supplies, etc.) and applicable setbacks (e.g., stream buffers, drinking water well setbacks, septic drainfield setbacks,building setbacks,etc.) Identification of any on-site or adjacent water bodies included on the Virginia 303(d) list of iired waters Current land use and location of existing and proposed roads, buildings, parking lots and other impervious areas P1 • ation and description of any planned demolition of existing structures,roads,etc. C Proposed land use(s) with a tabulation of the percentage of surface area to be adapted to various uses, including but not limited to planned locations of utilities, roads, parking lots, sto water management facilities,and easements Location of existing and proposed utilities [e.g., water (including wells), sewer (including septic systems), gas, electric,telecommunications,cable TV,etc.] and easements [' work specifications Show the BMP name, geographic coordinates and design of both structural and non- stryctural stormwater control measures, including maintenance access and limits of disturbance Storm drainage plans for site areas not draining to any BMP(s) 0/Location of existing and proposed conveyance systems, such as storm drains, inlets, catch basins, channels, lateral groundwater movement interceptors (French drains, agric. tile drains, etc), swales,and areas of overland flow, including grades,dimensions,and direction of flow [ yinal drainage patterns and flow paths Location of floodplain/floodway limits and relationship of site to upstream and downstream properties and drainage systems PROJECT NAME: 1-41(14141/-44-ti `-4j-4-‘4SUBMITTAL#: Z DI A1UQ iNATWIN. )2/)j2))ki V fir/ Page 4 of 5 . Version:February 2,2015 [Location of all contributing drainage areas and points of stormwater discharge, receiving surface waters or karst features into which stormwater discharges, the pre-development and post- development conditions for drainage areas, and the potential impacts of site stormwater on adjoining parcels 3 Location and dimensions of proposed channel modifications, such as bridge or culvert cro sings [-Final stabilization and landscaping plans 711—' Hydrologic and hydraulic analysis, including the following: Site map with locations of design points and drainage areas (size in acres) for runoff alculations jJ Identification and calculation of stormwater site design credits,if any apply Summary description of the water quantity and water quality compliance strategy. [Time of concentration(and associated flow paths) [Imperviousness of the entire site and each drainage area ["NRCS runoff curve numbers or volumetric runoff coefficients [ A hydrologic analysis for the existing (pre-development) conditions, including runoff rates, volumes,and velocities, showing the methodologies used and supporting calculations [r A hydrologic analysis for the proposed (post-development) conditions, including runoff rates, volumes,and velocities, showing the methodologies used and supporting calculations [/Hydrologic and hydraulic analysis of the stormwater management system for all applicable design storms [3Pollution load and load reduction requirements and calculations [T Final good engineering and sizing calculations for stormwater control measures, including contributing drainage areas, storage, and outlet configurations, verifying compliance with the wafer quality and water quantity requirements of the regulations lel Stage-discharge or outlet rating curves and inflow and outflow hydrographs for storage flities E.inal analysis of the potential downstream impacts/effects of the project,where necessary C Downstream analysis, where detention is proposed IP i am safety and breach analysis,where necessary Iit Representative cross-section and profile drawings and details of stormwater control measures and conveyances which include the following: ❑ Existing and proposed structural elevations(e.g., inverts of pipes,manholes,etc.) ❑ Design water surface elevations ❑ Structural details of BMP designs, outlet structures, embankments, spillways, grade control structures,conveyance channels, etc. Applicable construction and material specifications, including references to applicable material and construction standards(ASTM,etc.) 1,5 ' Landscaping plans for stormwater control measures and any site reforestation or revegetation PROJECT NAME: (-41441\/" " ` !k z--14%,(7-04- SUBMITTAL#: Z DT A MQ T A TL`il. / )2)))e' Page 5 of 5 s/ Version:February 2,2015 03f)> Long term operations and maintenance plan/agreement as governed by 9VAC25-870-112 of the Virginia Stormwater Management Program Regulations. /f-.p Evidence of acquisition of all applicable local and non-local permits 'J Waiver/exception requests /44-- Evidence of acquisition of all necessary legal agreements (e.g., easements, covenants, land trusts, etc.) /4-k Applicable supporting documents and studies (e.g., infiltration tests, geotechnical investigations,TMDLs, flood studies,etc.) 4 Other required permits: PROJECT NAME: /�'I�"/�1"/ / -L /14I `Wu )4 SUBMITTAL#: 2-- DI ANC itATL'T. 12j1)2-/), Albemarle County Engineering Erosion and Sediment Control Plan checklist for plan reviewers Updated 1 Dec 2014 An erosion and sediment control plan is a document which illustrates the measures used to control erosion and sedimentation during construction. All measures follow the Virginia Erosions and Sediment Control Handbook. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references,and(regular parenthesis)are explanatory. Links to reference documents are provided where possible. Application information: V Completed WPO application and fees,with owners signature [County Code 18-32.4.3.2, 18-32.3.9, 17 Article II] Erosion Control plans require a Water Protection Ordinance (WPO)application and original owner's signature. No review is provided without application,owner signature and fees. This is true even for revisions. It is important that the owner be aware of comments and re-submittals,and this is the county assurance. n(I K Copies of federal and state permits for any wetland or stream disturbance. (Army Corps, VDEQ,etc) [17-604, 18-32.1.2, 14-311] VSMP: / SWPPP,PPP, SWMP approvals obtained where necessary. In most cases,the erosion control plan will not be submitted independently,but will be part of a Stormwater Pollution Prevention Plan(SWPPP). Unless exempt,it will be approved with the SWPPP. Title information: V Project title. Titles should be appropriate. It should be an erosion control plan,not a stormwater plan,or site plan,etc. In some cases a WPO package will contain a stormwater plan and a mitigation plan,but they should be on separate sheets with keys ✓ and page titles. Professional seal,with original signature and date for professionally prepared plans. / Content: The erosion control plan must not contain information regarding permanent improvements that do not also appear on other plans. Erosion control plans are temporary documents that are discarded after projects are complete. Existing conditions plan view information: V accurate current existing topography at the time of submittal,including all existing site features,and any recent disturbances,all at a legible scale ✓ date and source of the topographic information: All topography should be at least visually field verified by the designer within the last year. Adequate erosion control cannot be ✓ designed without accurate topography and drainage areas. WPO buffer limits; 100' from stream or wetland bank,200' from reservoirs,or floodplain limit if greater. ff No buffer disturbances without WPO Program Authority approval and a mitigation plan. floodplain limits,including 100yr flood limits for any channel with a drainage area of 50+acres. Nome 'tome Albemarle County Engineering E&SC Plan Checklist Page 2 of 4 IJgA' Floodplain undisturbed. Disturbances require a Special Use Permit or Floodplain / Development Permit. V all existing easements(access,drainage, sight, sanitary easements,etc.)with deed book references, locations and dimensions t.fI A' all critical slopes(typically shaded) Zoning Ordinance buffers shown and protected undisturbed. Disturbances require Planning approval of a waiver. Proposed plan view information: Gradjng: proposed topography at minimum 2' contour intervals—tied into existing contours, as well as all proposed site features in later phases. (Sites with less than 6' of grade change should consider using smaller contour intervals.) These should agree with other final ✓ plans. proposed slopes are all 2:1 (horizontal:vertical)or flatter {Design Manual, section 8} Tproposed slopes steeper than 3:1 have low maintenance(not grass)ground cover specified on the plan {Design Manual, Section 8} At IA- existing critical slopes are not disturbed,unless a waiver or exemption has been granted for the disturbance. [18-4.2, 14-304] 14 q- Retaining Wall Plans approved. Any walls supporting roads or necessary infrastructure require engineered plans(not generic manufacturer's details)and computations. {Design Manual, section 8} This will also be required where walls are close to property lines and there is the danger of affecting neighboring property,either during construction,with later failures,or with pedestrian or vehicle safety. / final contour shapes and slopes ensure no un-drained pockets or stagnant pools Narrgtive: ✓ narrative and project title(Narratives are now optional, and not reviewed by the County, other than noting whether they are not seriously in error, like a boilerplate with another County's name on it.) Erosjon and sediment control measures: V limits of clearing and grading encompassing all disturbances,entrances, staging and parking areas,areas where sediment laden runoff will cross,or any construction related activities. This must match any landscaping and conservation plans submitted with site plans ./ \. r, Albemarle County Engineering E&SC Plan Checklist Page 3 of 4 ✓ a construction entrance(CE)draining to a sediment trap or basin ✓ dust control symbols(DC) ,/ temporary and permanent seeding symbols(TS, PS) / existing drainage divides / existing vegetation,with trees to be saved located by drip lines. This must match any landscaping and conservation plans. protection provided for all stages/phases of construction,from initial land clearing to Final grades and hardscapes. This is our most important item. Plans which show only inlet protection on proposed drainage systems,which are only possible to install upon / completion of grading,may be denied without further review. %/ no erosion control measures in the way of construction access or grading. Diversion dikes or silt fence are not placed in the middle of the site,or through access or grading. Sediment traps are not under or on top of fill material or held up by retaining walls. Construction entrances are not on fill,etc.If the concept for site protection is not ,/ adequate in this regard further review of the plan may not be possible. existing soil boundaries are shown with labels. Areas already disturbed are indicated, with constructed fill depth or cut noted. critical erosion areas are identified;areas of constructed slopes,areas near property lines t7//ei- adjacent off-site disturbances are shown with erosion control facilities // a stockpile location. where cut or fill balances have a 10,000 cubic yard deficit or more,plans should not be approved without a waste area identified. This must be on-site,or on another approved and permitted site. (Don't make the inspectors chase trucks to find the dump site violation.) N./ a staging and parking area,or other construction related areas t✓ diversion dikes are used to direct drainage to traps and basins V. silt fence is not used across contours in place of diversion dikes. V silt fence is limited to areas of sheet flow with %acre per 10011 of level on-grade silt fence. Plans showing only silt fence,without sediment trapping measures, should not be approved unless they meet this criteria and fill dirt is minimal. ✓ all swales and low points at the perimeter of the site have a sediment trap or basin. Silt fence in swales is typically not adequate. Check dams do not substitute for traps. Diversions which travel more than 100ft,or go in and out of swales,are usually not maintainable in the field. If the concept for site protection is not adequate in this regard, further review of the plan may not be possible. 14)A- temporary slope drains(TSD)or diversions are provided to prevent discharge over disturbed or fill slopes n()IY inlet protection(IP)on all inlets V culvert inlet protection(CIP)on all culvert inlets outlet protection(OP)on all outlets all watercourses are protected and encroachments minimized W stream crossing(USC,SC)and diversions are provided at all stream crossings. V adequate channels(MS-19)provided for each outfall (see Design Manual for minimum content) ,/ all traps and basins are shown with proposed contours. Simple boxes or symbols are not sufficient,in most cases,to determine layout or bond amounts. For each trap; V drainage area is 3 acres or less Simi `r.d Albemarle County • Engineering E&SC Plan Checklist Page 4 of 4 / sized for total drainage area, including those for in-line upstream facilities t/ wet storage is 67cy or more ✓ dry storage is 67cy or more ✓ wet storage is 4' deep or less wet storage side slope is 1:1 or flatter / dry storage side slope is 2:1 or flatter stone weir is 6ft per acre of drainage area / embankment and stone weir height is 5' maximum from outside toe V embankment top width is adequate(see table 16 reference) ✓ 2:1 length:width ratio for flow path For each basin; (GB 3.14) sized for total drainage area, including those for in-line upstream facilities N s wet storage is 67cy or more dry storage is 67yr or more wet storage side slope is 1:1 or flatter dry storage side slope is 2:1 or flatter embankment 15' high or less from downstream toe rf : principle and emergency spillways sized per handbook requirements embankment has 1' freeboard during 25yr storm with emergency spillway embankment has 2' freeboard during 25yr storm without emergency spillway A trash rack/anti-vortex device specified per handbook requirements ,11 s riser anchor size specified per floatation computation dewatering device sized for 6+hr drawdown of dry storage: 3"dia. minimum safety fence and signs stating"danger, quick sand, do not enter"provided if near any residential properties,or public access f.1),4- structures and embankment match permanent design for facilities to be converted to permanent stormwater management facilities Al& embankment top width is adequate(see Design Manual reference details) 2:1 length:width ratio for flow path. Baffles specified only on temporary structures (p.III-79). Baffles are a big hassle in construction, and should not substitute for properly dimensioned design if at all possible. D tails: p {- a paved construction entrance detail (see Design Manual reference details) for projects in the development areas over 10 acres NI a typical section for each temporary channel or diversion,referenced from the plan sheets. Existing ground should be shown at the maximum cross-slope on the plan. 14- details and copies of Program Authority permissions for any variances. Mcps or Early Grading: of mass grading Planning approval. (This is also called rough or early grading plans which contain only approximate finished grades and culverts necessary to grade)Mass grading can only be permitted within planned developments where a concept grading plan was approved with the rezoning. The agent(Director of Planning)needs to formally determine that the grading plan is in general conformity with the approved rezoning plan. Otherwise,an initial site plan needs to be approved prior to issuance of a grading permit. Issuance of a grading permit at the initial site plan stage, as apposed to after final plan approval,requires specific approval from the County Engineer. , Nome' '4‘4100 Albemarle County Engineering Drainage Plan checklist for plan reviewers Updated 1 Dec 2014 A drainage plans is typically a component of a road plan,site plan,or stormwater management plan. It consists of the channel,ditch,culvert,and stormsewer design drawings,drainage maps,and computations for hydrology and hydraulics. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references,and(regular parenthesis)are explanatory. Links to reference documents are provided where possible. kJ jfr A professional seal should be provided for any computation packages where are separate from sealed plans. Drairpage: [18-32.6.2d, 14-305, 311] ✓✓ drainage area maps(This is a basic element,and without this there is no review) drainage computations(usually in the form of tables from the VDOT Drainage Manual App. 9B-1 LD-2014,App.7B-1 LD-268,App.,App.8B-1 LD-269,etc. -computations are a basic element,and without them there is no review) IA- all proposed and existing storm sewer must be shown in plan view (n for residential development,principle access free of flooding during the 25yr storm [14- 410] " site runoff and entrances do not drain into streets(from VDOT Drainage Manual 9.4.5.2, 9.4.6.2) of!,O concentrated runoff(l cfs or greater)does not run across travelways/streets (as above following VDOT design)tdrainage does not run across,through,or backwater in dumpster areas [18-4.12.19] overland relief is provided for any drainage structure or inlet in case of clogging. The failure of any system will not cause structures,streets or yards to flood. {Policy} ridirection of flow change(or deflection angle)in each drainage structure is 90 degrees or greater(flow should not have to reverse direction)(from guide of VDOT Drainage Manual 9.4.9.3.2.3) /f�A' labels on all drainage structures provided(and should match the drainage computations and profiles) p/) provisions and easements for drainage across 3 or more lots. Dense development where fencing,decking,sheds,patios,etc. are expected should provide yard inlets and pipes in easements, rather than ditches {Policy} Drainage profiles: (applicable to site plans,road and drainage plans) [14-311, 18-32] drainage profiles for each pipe, structure or channel must contain: ✓ existing ground proposed ground NI s any channel linings rl : all utility crossings _ a VDOT designation(MH-1,DI-3B,etc.)for each structure n4 a throat length for each drop inlet ;, grate type for each grate inlet r( , a label on each structure to correspond with the computations I Sire `r./ Albemarle County Engineering Drainage Plan Checklist Page 2 of 2 ✓ material and strength class or gage of each pipe a)A- manhole access every 300' for 15"-42"or 800' for 48"or greater / pipe slopes at 0.5%min.to 16%max. (per VDOT stnds for anchors over 16%) concrete inlet shaping(IS-1)specified on any structure with a 4' or greater drop safety slabs(SL-1) in any structure taller than 12'. top or rim elevation for each structure 1.1 all invert elevations for each structure(with positive flow drop between inverts). tV end sections(ES-1)or endwalls(EW-1)on all pipe outlets. Endwalls for culverts 48"or taller tZ scour outlet protection at all outlets,corresponding to computations(Green Brook, OP) D image computations: (applicable to any plan proposing pipes,channels, etc.) "1)A- Pipe computations for all pipes All proposed systems are designed within open channel flow capacities. (HGL computations are not necessary,and should not be relied upon unless the entire system is to be watertight.) For systems within drainage easements,all proposed pipes are a minimum 15"in diameter There are no excessive outlet velocities(> 15fps) ►J IA Curb inlet computations for any curb inlets on grade All spreads are less than 10' carryover is accounted for 100%capture at entrances so no flow runs out entrances into travel lanes 100%capture,or overland flow of capacity storm,to stormwater management facilities. Typically stormwater management is designed to the 1 Oyear storm, and inlets on grade often cannot capture this. Inlets in sumps should be used. tAk- Curb inlet computations for any curb inlets in sump conditions All flow depths are below 6"in the capacity table All spreads are less than 10' 100%capture to stormwater management facilities ,/ Ditch computations for any ditches ✓ ditch linings specified per plans meet velocity requirements ✓ Culvert computations for any culverts V t/ headwaters< 1.5 x culvert height,and 18"below shoulder elevation of streets. Outlet protection computations for all outlets ✓ dimensions and stone sizes for all outfalls V Proppsed pipe and inlet drainage area map ✓ limits of all areas and sub-areas draining to proposed structures, and existing structures or channels which will be impacted ✓ acreage of each drainage area as used in computations hydrologic coefficient for each drainage area as used in the computations time of concentration for each drainage area as used in the computations i4 (� destination structure labeled for each drainage area(if not obvious) Page 1 of 5 • Version:February 2,2015 PLAN SUBMITTER'S CHECKLIST FOR STORMWATER MANAGEMENT PLANS Please fill in all blanks and please reference the Dian sheets/nages where the information may be found, where appropriate,or write N/A by items that are not applicable. GENERAL Plan Submission Date /01,41149 Project Name 0S471G/f / VSMP Permit Number Site Plan Number �j j'P— ZP�/�o- 000¢3 Site Address 6100 ! . 7 v✓ kr> I ►tel ✓ A04- Applicant v 5 �Z Phone Number 454----Wee-2-3. Applicant Legal Address 3• 4 v 92' 0V/ 747i/4- 2-903 Owner Phone Numbef Owner E-mail Address Principal Designer 140-j.99nPhone Number546 ?P-6/Z03 Principal Designer E-mail Address fk-, , g l.t-✓V-4e/n Total Disturbed Area Figure 7-6O q Professional's seal - The designer's original seal, signature, and date are required on the cover sheet of each Narrative and each set of Plan Sheets. A facsimile is acceptable for subsequent Plan Sheets. / Number of plan sets-Attach two sets of SWM Plans. 14 l/4)--- Exceptions - Exceptions requested are governed by Section 9VAC25-870-57 of the Virginia Stormwater Management Regulations. / Local Consideration-Provide contact information for the locality's plan review coordinator. Name Phone Number 441S &32 Address -1.:41;;/ - /7è'kt> Fisch Ute, VJp.,410 1- 14/ Grandfathering - Attach supporting documentation consistent with the requirements of Section 9VAC25-870-48 of the Virginia Stormwater Management Regulations. ►J 1A- Offsite Compliance - Attach letter of availability from the off-site provider as governed by Section 9VAC25-870-55 of the Virginia Stormwater Management Regulations. PROJECT NAME: 4116 I I 44%/ SUBMITTAL#: DI AATQ T A PDT. '&61//lv Page 2 of 5 Version:February 2,2015 CHECKLIST PREPARER I certify that I am a professional in adherence to all minimum standards and requirements pertaining to the practice of that profession in accordance with Chapter 4(§ 54.1-400 et seq.)of Title 54.1 of the Code of Virginia and attendant regulations. By signin l this checklist I am certifying that this document and all attachments are,to st of my owl belief,true,accurate,and complete. SIGNATURE 1 PRINTED N � ��t/JI�f � QUALIFICATIONS DATE PROJECT NAME: L I" h/ 5//4 f✓ G ' Z-& SUBMITTAL#: r DT A NQ 111k A TL'T\. 41,10 i/b Page 3 of 5 Version:February 2,2015 SITE PLANS Please reference the plan sheet numbers where specific information may be found in the blanks below. 1—?7 Common address and legal description of the site, including the tax reference number(s) and parcel number(s)of the property or properties affected. A narrative that includes a description of current site conditions and proposed development and final site conditions, including proposed use of environmental site design techniques and practices, stormwater control measures,relevant information pertaining to long-term maintenance of these measures,and a construction schedule. I,Z -PI Existing and proposed mapping and plans (recommended scale of 1" = 50', or greater detail), ( which illustrates the following at a minimum: [v](North arrow EBiegend [Vicinity map ET xisting and proposed topography(minimum of 2-foot contours recommended) C Property lines fli ' rennial and intermittent streams [ Mapping of predominant soils from USDA soils surveys as well as the location of any site- specific test bore hole investigations that may have been conducted and information identifying the hydrologic characteristics and structural properties of soils used in the installation of srwater management facilities [( undaries of existing predominant vegetation and proposed limits of clearing and grading Location and boundaries of natural feature protection and conservation areas (e.g.,wetlands, lakes, ponds, aquifers, public drinking water supplies, etc.) and applicable setbacks (e.g., stream buffers,drinking water well setbacks,septic drainfield setbacks,building setbacks,etc.) 1,47 Identification of any on-site or adjacent water bodies included on the Virginia 303(d) list of im red waters [/Current land use and location of existing and proposed roads, buildings,parking lots and other impervious areas tly,oca tion and description of any planned demolition of existing structures,roads,etc. Proposed land use(s) with a tabulation of the percentage of surface area to be adapted to various uses, including but not limited to planned locations of utilities, roads, parking lots, sto water management facilities,and easements [Location of existing and proposed utilities [e.g., water (including wells), sewer (including 7ic systems),gas,electric,telecommunications,cable TV,etc.]and easements work specifications Show the BMP name, geographic coordinates and design of both structural and non- tural stormwater control measures,including maintenance access and limits of disturbance [ Storm drainage plans for site areas not draining to any BMP(s) [Location of existing and proposed conveyance systems, such as storm drains, inlets, catch basins, channels, lateral groundwater movement interceptors (French drains, agric. tile drains, etc),swales,and areas of overland flow, including grades,dimensions,and direction of flow Q F' al drainage patterns and flow paths [ Oration of floodplain/floodway limits and relationship of site to upstream and downstream properties and drainage systems PROJECT NAME: - ). G SUBMITTAL#: I I DT AMC 11A7`L'il. /yI3() I// Mrd' liar/ Page 4 of 5 • Version:February 2,2015 (Location of all contributing drainage areas and points of stormwater discharge, receiving surface waters or karst features into which stormwater discharges, the pre-development and post- development conditions for drainage areas, and the potential impacts of site stormwater on adjpining parcels Location and dimensions of proposed channel modifications, such as bridge or culvert cro,ssings Final stabilization and landscaping plans 1— tk Hydrologic and hydraulic analysis, including the following: Site map with locations of design points and drainage areas (size in acres) for runoff lculations entification and calculation of stormwater site design credits, if any apply 13/Summary description of the water quantity and water quality compliance strategy. ime of concentration(and associated flow paths) /Imperviousness of the entire site and each drainage area ACS runoff curve numbers or volumetric runoff coefficients [3 Ahydrologic analysis for the existing (pre-development) conditions, including runoff rates, volpfnes,and velocities,showing the methodologies used and supporting calculations A hydrologic analysis for the proposed (post-development) conditions, including runoff rates, vol es,and velocities,showing the methodologies used and supporting calculations [Hydrologic and hydraulic analysis of the stormwater management system for all applicable desa storms [IP ollution load and load reduction requirements and calculations Final good engineering and sizing calculations for stormwater control measures, including contributing drainage areas, storage, and outlet configurations, verifying compliance with the water quality and water quantity requirements of the regulations 0'Stage-discharge or outlet rating curves and inflow and outflow hydrographs for storage facilities anal analysis of the potential downstream impacts/effects of the project,where necessary Downstream analysis,where detention is proposed g4rDam safety and breach analysis,where necessary i 4' Representative cross-section and profile drawings and details of stormwater control measures and conveyances which include the following: 1,111Sexisting and proposed structural elevations(e.g., inverts of pipes,manholes,etc.) Q'Design water surface elevations 4VY Structural details of BMP designs, outlet structures, embankments, spillways, grade control //�l structures,conveyance channels,etc. T Applicable construction and material specifications, including references to applicable material and construction standards(ASTM,etc.) 1 Landscaping plans for stormwater control measures and any site reforestation or revegetation PROJECT NAME: 1-4144APPIfr7refil SUBMITTAL#: / DT A NQ T A I' U . '?/ ii `✓' `err' Page 5 of 5 Version:February 2,2015 /4007 Long term operations and maintenance plan/agreement as governed by 9VAC25-870-112 of the Virginia Stormwater Management Program Regulations. ep Evidence of acquisition of all applicable local and non-local permits 1/Y Waiver/exception requests 141V Evidence of acquisition of all necessary legal agreements (e.g., easements, covenants, land trusts, etc.) IApplicable supporting documents and studies (e.g., infiltration tests, geotechnical investigations,TMDLs, flood studies,etc.) )/eK Other required permits: PROJECT NAME: /1141/ G — SUBMITTAL#: I Di A TQ n A TU11. q IN