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HomeMy WebLinkAboutWPO200400078 Plan - Stormwater Stormwater Management Plan 2004-08-111 I I i II I I / TMP 50-20A NOTE: BMP SILT BASIN RETROFIT IS NOT TO BE INSTALLED UNTIL THE SITE IS SUBSTANTIALLY STAILIZED ACCORDING TO THE E&S INSPECTOR AND WATER RESOURCES MANAGER. 2' MIN: 50% SAND, 30% TOPSOIL, 20% LEAF MULCH (SAND : 0.02 0.04", ASTM C33 FINE) STONE TOP OF BERM WEIR SIDE SLOPES REGRADED TO 3: 1 (MAX) 1' MIN. UNDERDRAIN GRAVEL (AASHTO M43, 0.5-1") WRAPPED IN FILTER CLOTH REMOVE SILT & SEDIMENT AFTER FINAL STABILIZATION. REPLACE WITH LOAM OR GRANULAR EARTH FILL PROFILE BMP SEDIMENT TRAP RETROFIT (AFTER CONSTRUCTION) 2® / TMP 50-20E I I C ��VC7I �• LIMITS OF DISTUQSAN'CE _ X - _ Appi-c lrnate Droinfteld L.ocatlon X Silt Trap Volume Calculations Drainage Area (ac): 0.16 Wet Storage Req Icy): 10.72 Dry Storage Req (cy): 10.72 Total Storage Req (cy): 21.44 Elev Area Vol Vol (af) (cf) (cy) Low Point 94.7 256 Bottom of Weir 97.7 256 768 28.4 total wet Top of Weir 99.0 360.0 400.4 14.8 total dry Weir Length (ft) i.0 Bio-Ftltor Sizing (<507. removal required) 5020 sf ultimate 1mpervious02.57=200 sP roq 240 sr' provided BIo-Fitor Planting 240 sf 0 400/ac = 3 Plants 1 2.5°cal mix Red Maple 2 18° mix Barberry/Spica Bush STATE ROUTE. 231 Ek 30x4O° 8(l/LD(JVG TREE RIDING RING v P12AVEL �.:. 5x6' Dumpster (with 6' wood enclosure \ to match barn) (8xl6' concrete pad) 0 0/ 530--- PADDOCK 1 \ SLACK k \ 2' TOP OF BERM SOD TURF COVER TOP OF WEIR = 99.0' 3: 1 CLEAN -OUT _ W/WATERTIGHT CAP 97.7' TOPSOIL G SAND - SAND: 0.02-0.04" 2.0' (MUSTS TM BE IN P CTED) BY 1_1WATER RESOURCES MANAGER G _- EROSION( CONTROL e note #2 below)INSPETOR) 6 PVC PIPE AT NON-PERFORAl ED - _: ____ -._ SLOPE (MIN) TO DAYLIGHT ------------ - UNDERORAIN GRAVEL 4" PERFORATED - PV6 PIPE AT 1% (AASHTO M 3, 1/2"-1") BIOFILTE=R CROSS SECTION SLOPE (MIN) WRAPPED IN FILTER FABRIC STORMWATER/BMP NOTES 1. BMP is not to be constructed until the site is adequately stabilized, according to Water Resources Personnel (434-296-5661) 2. The bio-filter soul mix must be the Luck Bio-filter Mix available from Luck Stone or a tested and approved equivalent. For addional information contact Water Resouuces Personnel (434-296-5861). 3. The sand/soil mix must be stabilized with sod along with the trees and/or shrubs listed on the plan. Ex wf l lapprox) &MP Ex� Bio-Ftltor Sizing (<50% removal required) 6020 sf ultimate impervious02.51-200 sf roq 240 sf provided SIC-Ftltor Planting 240 sf 0 400/ac = 3 plants 1 2.5'cal mix Red Maple 2 IT mix Barberry/Spica Bush GRAPHIC SCALE 1"=20' 0 20 40 60 VICINITY MAP 1" = 2000' Old Dominion Equine Erosion/Sodimont Control Narrative June 22, 2004 PROJECT DESCRIPTION The Projoct consists of conversion of an old store to a veterinarian's office, removal of asphalt Parking, construction of grovel Parking and access and a barn. This will require the disturbance of 0.5 acres. EXISTING SITE CONDITIONS The site is cleared. ADJFl,CENT PROPERTY The s;te is surrounded by State Route 231 to the northwest and State Route 640 to the northeast and other rural properties to the south, TMP 50-ROA and TMP 50-20E. OFP"SITE AREAS No off -situ areas will be disturbed. SOILS 628 noson silt loom, 322, fluvanno silt loam. 462, Iignam slit loam CRITICAL EROSION AREAS There are no critical erosion areas. EROSION AND SEDIMENT CONTROL MEASURES Unless otherwise indicated, all vegetative and structural erosion and sediment control practices will be constructed and maintained according to minimum standards and specifications of the Virginia Erosion and Sediment Control Handbook (VESCH). STRUCTURAL PRACTICES I. Construction Entrance- 3.02 A temporary paved construction entrance shall be installed at the beginning of the project. 2. Silt Fenco- 3.05 A temporary sediment barrier consisting of a synthetic filter, fabric stretched across and attached to supporting posts and ontrencbed. Silt fence will be installed along the state roads where asphalt is to be removed as shown on the EE!SC plan shoot to prevent sediment from leaving the site. 3. Temporary Sediment Trap - 3.13 A small ponding area, formed by construction an earthen embankment with a stone outlet across a drainage swain. A sediment trap shall be constructed where the bio-filter will go and must be installed and stabilized prior to site grading. 5. Outlet Protection - 3.16 Riprop channel and/or stilling basins below storm drain outlets. Outlot protection shall be installed on the outlet Ue as shown on the EESC plan Immediately after installation. Inlot Protection - 3.07 A sod Mont filter or an excavoted impounding area around a storm drain drop Inlet, curb Inlet or culvert. Inlet protection shall be, installed on the culvert immediately after Installation to prevent sediment compromising its capacity. The existing culvert under route 640 shall have inlot protect immediately. 7, Dust Control Dust Control measures shall be utilized to provont the movement of dust from exposed soil surfaces and reduce the rrose:.co of airborne substances which may present health bazords, traffic safety probloms or harm animal and plant lfe. VEGETATIVE PRACTICES 1. Temporary Gooding - 3.31 I-stabl;sbmont of temporary vegetative cover on disturbed aroos by sending with appropriate rapidly growing plants on be brought 30 days German Millet / sites that will not to final grade for poriods of to one year. at 60 Ib./ac., Weeping Lovngross at 3 Ib./ac., Korean Lospedozo at 20 Ib./ac. Temporary seeding shall be fertilizod. Fertilizer shall be applied at a rate of 600 ibs/acre of 10-20-10 according to the handbook. The builder may save considerable funds by having the soil tested by VA TECH (kits are available at the extension office and the test costs $7.00). 2. Mulch - 3.35 Organic mulch shall be used in conjunction with sending operations and shall be applied at the rate of 2 tons/acre. 3. Dust Control- 3.33 Dust control Measures shall be utilized throughout this site when necessary. Typical temporary measures include but are not limited to, irrigation, temporary seeding barriers. These measures will Old in the proventlon of harmful airborne substances as well the effects of wind erosion. MANAGEMENT STRATEGIES 1. Construction should be sequenced so that grading operations can begin and and as quickly as possible. 2. Sodimont trapping measures shall be installed as a first step in grading and shall be seeded and mulched immediately following installation. 3. Th3 job superintendent shall be responsible for the installation and maintenance of all erosion and sediment control practices. 4. Temporary sanding or other stabilization will follow Immediately after grading. 5. Areas which are not to be disturbed will be clearly marked by flags, signs, otc. 6. After achieving adequate stabilization, the temporary EgS controls will be cleaned out and converted to permanent stormwater management basins. PERMANENT STABILIZATION All areas disturbed by construction will be stabilized with permanent seeding Immediately following finish grading. Gooding will be done with Kentucky 31 Tall Foscuo according to Std. 9 Spec. 3.32 of The Virginia Erosion 9 Sediment Control Handbook. 5-20-10 fertilizer shall be applied at the, rate of 1060 Ib/ac and lime at 2 tons/cc. Permanently sanded areas shall be) protected during establishment with straw mulch (2 tons/ac). STORMWATER MANAGEMENT Stormwator is routed to a bin -filter where water quality will be improved. Stormwator than leaves thorough an existing drainage system. MAINTENANCE In general, all erosion and sediment control measures will be checked daily and after each significant rainfall. The following items will be, chocked in particular: 1) Should sediment basins and/or silt traps be required, thny will be cioannd and maintained according to the Virginia Erosion 9 Sediment Control Handbook. 2) All gravel outlets will be checked regularly for sediment buildup that will prevent drainage. if the gravel is clogged by sediment, it shall be removed and cleaned or replaced. 3) All silt fence barriers will be chocked regularly for undermining or deterioration of the fabric and repaired as required. Sediment shall be removed when the level of sediment deposition reaches half way to the top of the barrier. 4) All seeded areas will be chocked regularly to see that a good stand is maintained. Areas should be fertilized and reseeded as needed. MS-1 Stabilization of Denuded Areas and Soil Stockpiles Permanent or temporary soil stabilization must be applied to denuded areas within seven days after final grade, is reached on any portion of tbo 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 loft dormant for more than one year. Soil stabilization refers to measure which protoct soil from the erosive forces of raindrop impact and flowing water. Applicable Practices include vogotati" establishment, mulching, and the early ap licatian of grovel base on areas to be paved. Soil stabilization measures should be solectod to be appropriate for the time of year, site conditions and estimated duration of use. MS-4 Timing and stabilization of Sediment Trapping Measures y�H OF Sediment basins and traps, porimeter dikes, sediment barriers and other measures intended to trap sediment shall be constructed as a first stop in any land -disturbing activity and shall be made functional beforo up -slope land O� 9C disturbance takes place. MS- 5 Stabilization Measures Stabilization measures shall be applied to earthen structures such as dams, dikes and diversions immediately after installation. MS- 17 Vehicle Across W. THOMAS MUNCASTER, JR. Whore construction vehicle access routes intersect paved public roads, provisions shall be made to minimize the Whore transport of sediment by (vehicular) tracking onto the paved surfaco. sediment is transported onto a public C-) CERT, NO. 16242 QZ road surface, the road shall be, cleaned thoroughly at the and of each day. Sediment shall be removed from the roads Cn 9J 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 �n �4 larger land disturbing activities. MS-16 Disposition of Temporary Measures ARQFESSI�� All temporary erosion and sediment control measures shall be, removed within 30 days after final site stabilization or of ter the temporary measures are no longer needed, unless otherwise authorized by the local administrator. program Trapped sediment and the disturbed soil areas resulting from the disposition of temporary measures shall be pormanontly stabilized to prevent further erosion and sedimentation. TEMPORARY PERMANENT Sediment Trap To Stormwater BMP Construction Notes 1. All disturbed areas must be stabilized with pavement or a good stand of vegetation prior to the conversion of the trap to a stormwater BMP. 2. Accumulated sediment must be removed from the trap to a depth 18 below the stone weir (see detail), the interior slopes of the trap regraded to 3:1 or flatter, and the stone weir repaired if necessary. 3. De -watering Trench shall be installed in accordance with the attached Sediment Trap to BMP Plan and the De - watering Trench Detail . Prior to installation, the location and orientation of the trench shall be field determined by David Hirschman (Water Resources Manager) and the Contractor. 4. After installation of the de -watering trench, the bottom of the stormwater BMP will be covered with at least 2' of a 50/50 mixture of sand and topsoil, and then permanent seed & mulch applied. GENERAL EROSION AND SEDIMENT CONTROL NOTES ES-1: Unless otherwise indicated, all vegetative and structural erosion and sediment control Practices will be constructed and maintained according to minimum standards and specifications of the Virginia Erosion and Sediment Control Handbook and Virginia Regulations VP 625-02-00 Erosion and Sediment Control Regulations. ES-2: The plan approving authority must be notified one weak prior to the pre - construction conference, one week prior to the commencement of land disturbing activity, and one week prior to the final inspection. ES-3: All erosion and sediment control measures are to be placed prior to or as the first step in clearing. ES-4: A copy of the approved erosion and sediment control plan shall be maintained on the site at all times. ES-5: Prior to commencing land disturbing activities in areas other than indicated on these plans (including, but not limited to, off -site borrow or waste areas), the contractor shall submit a supplementary erosion control the Ian approving auttzoritx� ' 1-1 plan to the owner for review and a y P m- Einstallation by The contractor is responsible for installation of any additional erosioin control measures necessary to prevent erosion and sedimentation as determined by the plan approving authority. ES-7: All disturbed areas are to drain to approved sediment control measures ati, all times during land disturbing activities and during site development until final stabilization is achieved. ES-8- During dewatering operations, water will be, pumped into an approved . filtering device. cO.r';�)Md' N1 ES-5. The contractor shall inspect all erosion control measures periodically and after each runoff -producing rainfall event. Any necessary repairs or cleanup to maintain the effectiveness of the erosion control devices shall be made immediately. PC- n m r i m n rn v m v 0 rn N N Q J J H .7 co u r- a J U O IR Q O Q U] m i 4 O ti W O r m in z 0 UJ UJ 0 z v o w H rn a c m m : > m a n ~ z 0 J H � H Cn H w 'u 0 J UJ m cv z ` (O ryI 1 CZ IL '57 V Q ® H M Fn z C-3 61 4-j H C n J CD E --^� U 0 4-1 M 1) C l i g 0 Q �! ! U 0- CZ U r--i ® J 0 If CDC-- r-1 Q ' n L J � C � C 1-1 LLI m 0 0 x U) 0 f_1 0 W DESIGNED BY DATE TM 6126104 DRAWN BY DATE TM 6/26/04 CHECKED BY DATE FILE EDIT OldDominionE(�uine - SCALE 1 " =20 ' DRAWING % _ g I. 1 .v 44i,P L.O T PROJECT - zw SHEET NO.