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Home My WebLink AboutWPO200500072 Checklist 2005-09-13 j 6 u-- ftft- t& C, ( ENG REVIEW CHECKLIST: Erosion Control Plan 4' ` ( .) [DM907C] all stages of construction are protected, and construction does i ;"r f- v _1 measures , (If the site is not protected from the initial disturbance of the ground, to the time final grades ' e established and stabilized, no further review is provided. For example, if only inlet protection'is _ ( shown, or only final contours are considered, initial grading is not protected.) .(L - c N j [17-204E] site plan or plat approved Narrative: [ ] �. f e ( I:y - [VESCH VII -6, App.7A -2, p.VI -13] All items on state CHECKLIST completed satisfactorily Plans [ 17 -203, DM907, 501] Sf€ ! + [VESCH VII -6, App.7A -2, p.VI -13] All items on state CHECKLIST completed satisfactorily C::__ [VESCH Table VI -151 general erosion and sediment control construction notes on plan, verbatim r� SH3.39] dust control symbol shown on plan [policy_7, DM Ch5 App WR -1] paved wash rack detail and required note (see below) on plan A [policy_5] for subdivisions, required note (see below) regarding lots on plan 11JA [DM907D] protected areas (incl. critical slopes) and buffers per stormwater, mitigation, site, or subdivision plans [18- 21.7.3, 26 -10.3, 32.7.9.8] 20' commercial , or 30' industrial zone buffer if appl. (waste areas) [18- 30.3.3.2] fill or change in floodplain SP approved (waste areas) [18- 5.1.28] zoning approval for fill >10,000sf (waste areas) [ 18- 10.2.1,2] SP approval for cut >50,000cy in RA zoning (borrow areas) [18 -4.3] no tree cutting unless RA, or site plan approved (waste areas) [18- 30.4.2.1, 30.4.3, 10.2.1.18, 10.2.2.40] zoning approval in Nat. Res. Extraction Overlay District Facility specific plan requirements: IVA [policy_l] Use standard details from VESCH, or references only, no re- drafted details Atia [policy_2] proposed (temporary or permanent) contours must be shown for traps and basins Traps: [VESCH3.13 p.III-71] Ai& less than 3 acres of drainage C computations provided with narrative O trap volume; 134 cy of storage per acre, half wet .n ft' 6 pi,e c e' weir length; 6' per acre C.'S+ „ Ca C minimum bottom, dimensions, slopes noted on plans per computations for volume - ,O detail or schematic on plan with elevations labeled, slopes, weir length, etc. 0 [DM501D2] dry trap modification requested in writing with justification, and approved Basins: [VESCH3.14 p.III -77] Q [policy_3] basins structures and embankments should match permanent stormwater structures if conversion will occur computations provided with narrative flow and hydrology for spillway designs (p.III-80 & 81) basin volume; 134 cy of storage per acre, half wet (p.III -79) riser and barrel comp for 2yr storm (p.III -81) emergency spillway channel comp, or 25yr storm riser design (p.III -81) l' high water to top of dam with emergency spillway, or 2' without (p.III -81) floatation comps for risers taller than 10' (p.III -82) dewatering orifice sized (App.3.14 -a) minimum bottom dimensions on plans per computations for volume (p.III-79) riser base provided (p.III -82 & 110) 1 c REVIEW CHECKLIST: erosion control plan Page 2 of 2 anti -vortex and trash rack provided (p.III -81) detail (p.III -83) on plan with elevations labeled, slopes, pipe and riser sizes, etc. embankment dimensioned <10' high: 6 top, 2:1 sides, or > 10' high: 8' top, 2.5:1 sides (p.III -80) scour protection at outlet (p.III-82) length to effective width ratio 2:1 or better, effective width = pool area/flow path (p.III-79) [VESCH 3.01] safety fence and signs [DM501D1] dry silt basin riser modification requested in writing with justification, and approved SikFence: [VESCH 3.05] - less than 100' slope length behind fence (p.III -20) sheet and rill flow only, no concentrated flow >lcfs, or lacre total (p.III -20) not used as diversion FINAL CHECK of minimum standards addressed on plan or in narrative: [MS 1] temporary stabilization [MS 2] stockpiles protected [MS 3] permanent vegetation [MS 4] trapping and diversion measures installed first [MS 5] earthen structures stabilized [MS 6] traps and basins sized for total areas [MS 7] slopes minimum erosion [MS 8] concentrated runoff not over slopes [MS 9] slope seeps protected [MS 10] inlet protected [MS 11] outlets stabilized [MS 12] watercourses protected, encroachment minimized [MS 13] stream crossings provided [MS 14] federal, state, local regulations met [MS 15] watercourse bed and banks stabilized [MS 16] utility line construction follows a -f [MS 17] minimize tracking of mud on roads, clean up daily [MS 18] all temporary measures removed [MS 19] downstream properties protected Items to be completed before approval: [VESCH VII -6] site inspection conducted on [17 -204] bond amount according to latest cost figures [17 -209] Verify fee, or request correction: Disturbed acres and appl. fee $320 +$125 /acre policy_l: Except for basins and traps, which need to show elevations and dimensions; to avoid overlong review times, standard details should not be part of plans. There is no need to attach them to the plans, as all projects will have an RLD on -site with knowledge of the specifications. Reviewers should not have to check standard details to ensure nothing has been changed. If designers feel they must include these standard details with plans, they should be added after approval, and not be part of the approved plan set. policy_2: To ensure constructability, and to verify dimensions and outlet placement, grading should be provided. Waivers of this policy should be requested in writing only if it is glaringly obvious that plenty of room exists and an adequate facility can be built without difficulty. REVIEW CHECKLIST: erosion control plan Page 2 of 2 policy_3: The same structures should be used (with slight modification) to avoid sediment discharge when a riser is replaced. This also makes for easier conversion and inspection. policy_5: Provide the standard note: "The developer shall reserve the right to install, maintain, remove and /or convert to permanent stormwater management facilities (where applicable) all erosion control measures required by this plan regardless of the sale of any lot." policy_7: Provide the standard note for paved wash rack details: "A minimum water tap of 1 inch must be installed with a minimum 1 inch ballcock shutoff valve supplying a wash hose with a diameter of 1.5 inches for adequate constant pressure. Wash water must be carried away from the entrance to an approved settling area to remove sediment. All sediment shall be prevented from entering storm drains, ditches or water courses." Erosion & Sediment Control Plan Checklist OAtr t �t qS - G R/FD / N G ♦i r 1 � � � �� S V ■1x1 1 ,T'TGD . T N P 5 ffC -Q 4 - 41 7.1..' c 4tvnr0T elE R m w VP TIC TNA i144 AT 4/7020 Ver.zp Name of Plan: WPO 2005 -00072 HOLLYMEAD TOWN CENTER — AREA C, BOCK 5 /0-4 `o s F R i`'' Plan No.: K �NbW T/,t. Date: Number of Copies: Narrative Plans The following step -by -step checklist will assist applicants with the preparation of an erosion & sediment control plan in accordance with the ordinance. Narrative will include: Project Description - Briefly describes the nature and purpose of the land disturbing activity, and the area (acres) to be disturbed. Existing Site Conditions - A description of each of the following: existing topography, vegetation and drainage. Ad' - - - t Areas - A description of neighboring areas such as streams, lakes, residential areas, roads, etc., which � ight be affected by the land disturbance. L Off -Site Areas - Describe any off -site land disturbing activities that will occur (including borrow sites, waste or surplus areas, etc.). If no off -site areas will be disturbed as part of this site, then this must be clearly stated in the narrative. FR / Soils - A brief description of the soils on the site giving such information as soil name, mapping unit, erodibility, rmeability, depth, texture and soil structure based on the "USDA Soil Survey of Albemarle County, Virginia ". Ej Critical Areas - A description of areas on the site which have potentially serious erosion problems (e.g., steep sloes, channels, wet weather /underground springs, etc.). Erosion & Sediment Control Measures - A description of the r which will be used to control erosion and sedimentation on the site. (Controls should meet the specifications in Chapter 3 of the Handbook.) / Permanent Stabilization - A brief description, including specifications, of how the site will be stabilized after construction is completed. El Stormwater Runoff Considerations - Will the development site cause an increase in peak runoff rates? Will the increase in runoff cause flooding or channel degradation downstream? Describe the strategy to control stormwater runoff. 0 Calculations - Detailed calculations for the design of temporary sediment basins, permanent stormwater detention basins, diversions, channels, etc. Include calculations for pre- and post - development runoff. n Maintenance - A schedule of regular inspections and repair of erosion and sediment control structures should be set forth. The Department of Engineering & Public Works suggests the following as a minimum guideline: 05 February 2003 1 of 5 CD -8 Maintenance: In general, all erosion and sediment control measures will be checked daily and after each significant rainfall. Specific attention will be given to the following items: a. Sediment basins and/or traps will be cleaned and maintained in accordance with the Virginia Erosion & Sediment Control Handbook. b. All gravel outlets will be checked regularly for sediment buildup that will prevent proper drainage. If the gravel is clogged by sediment, the gravel will be removed and cleaned, or it will be replaced. I q" Minimum Standards - All applicable Minimum Standards must be addressed. The following minimum standards must be included in all narratives: ❑ 4(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. Temporary soil stabilization shall be applied within seven days to denuded areas that may not be at final grade but will remain dormant (undisturbed) for longer than 30 days. Permanent stabilization shall be applied to areas that are to be left dormant for more than one year. ❑ 4(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. ❑ 4(5): Stabilization measures shall be applied to earthen structures such as dams, dikes and diversions immediately after installation. ❑ 4(17): Where construction vehicle access routes intersect paved public roads, provisions shall be made to minimize the transport of sediment by (vehicular) tracking onto the paved surface. Where sediment is transported onto a public road surface, the road shall be cleaned thoroughly at the end of each day. Sediment shall be removed from the roads 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 subdivision lots as well as to larger land disturbing activities. ❑ 4(18): All temporary erosion and sediment control measures shall be removed within 30 days after final site stabilization or after the temporary measures are no longer needed, unless otherwise authorized by the local program administrator. Trapped sediment and the disturbed soil areas resulting from the disposition of temporary measures shall be permanently stabilized to prevent further erosion and sedimentation. Eros' n & Sediment Control Plan will include: Vicinity Map - A small map locating the site in relation to the surrounding area. Include any landmarks that fight assist in locating the site. icate North - The direction of north in relation to the site. Limits of Clearing & Grading - Areas that are to be cleared and graded (including demolition of existing roads and structures). I n Existing Contours - The existing contours of the site. 05 February 2003 2 of 5 CD -8 Final Contours - Changes to the e isting contours, including final rainage pad erns. f 1 utcdld Ii 4, figp, c hervd El? Existing Vegetation - The existing tree lines, grassed areas, or unique vegetation. [Soils - The boundaries of different soil types. Contact the Department of Engineering & Public Works, Erosion lqi°ntrol section (434) 296 -5861 if you are unsure of the soils on your site. Existing Drainage Patterns - The dividing lines and the direction of flow for the different drainage areas (including the areas for each inlet and E &SC measure) to verify adequacy. Note the size (acreage) of each ainage area. Critic. - Erosion Areas - Areas with potentially serious erosion problems. (See Chapter 6 of the Handbook for c ' eria.) II ite Development - Show all improvements such as buildings, parking lots, access roads, utility construction, etc. Lo ation of Practices - The locations of erosion and sediment controls and stormwater management practices used on the site. Use the standard symbols and abbreviations in Chapter 3 of the Handbook.) N' Off- 'te Areas - Identify any off -site land disturbing activities (e.g., borrow sites, waste areas, etc.). Show cation of erosion controls. (Is there sufficient information to assure adequate protection and stabilization ?) Detail Drawings - Any structural practices used that are not referenced to the E &S Handbook or local handbooks should be explained and illustrated with detail drawings. CP ust Control — Dust control must be provided on all projects. Include the dust control symbol on the plan sheet. C struction Entrance - Wash rack if necessary. Note for the erosion control measures located on subdivision lots: "The developer shall reserve the right to install, maintain, remove and /or convert to permanent stormwater management facilities (where applicable) all erosion control measures required by this plan regardless of the sale of any lot." Miscellaneous Information ❑ Waste Areas - Must comply with all waste area regulations (refer to Waste Areas Checklist). n Borrow Areas - Must comply with all borrow area regulations (refer to Borrow Area Checklist). ❑ Critical (25 %) Slopes - Grading and construction activity in these areas must comply with the County Code, Chapter 18 - 4.2.3 05 February 2003 3 of 5 CD -8