The URL can be used to link to this page

Home My WebLink AboutWPO200500026 Plan - E&S 2005-06-21The developer shall rosorve the right to Install, maintain, remove and/or convert to Permanent st Ormwator management facilities (whore applloablo) all erosion control measures required by this plan regardless of the sale of any lot. N ` / N SG P1414S Y * Reviewed and Approved by the - Community Development Department I I I I • /� / e:�v4D0�Dat/ .�6egl� ,' / •a / �"Fil#0 -Zocl, / v / I \ /re TOCK�ILE \ yQ) / Silt Trap #2 VICINITY MAP Drainage Area (ac): 0.33 Wet Storage Req (cy): 22.11 Dr Stara e Re (c ) o 22 11 y g 4 y - Total Storage Req (cy): 44.22 C' 'i Elev Side 1 Side 2 Area Vol Vol \ S7 T G \ Cn (sf) (cf) (Cy) p D. Low Point 734.0 6 8 64.0 m I I 1: 1 side slope 0 Bottom of Weir: 738.0 16 18 256.0 640.0 23.7 wet ti`v0 \ 3: 1 side slope Top of Weir 739.6 22.4 21.4 501.8 606.2 22.5 dry Weir Length (ft): 2.0 G I \ Weir Height (ft) : 1.6 Top of Berm: 740.6 Top Weir: 739.6 O 1 I of Berm Width (ft): 2.5 Q�QPP��O� / Silt Trap #1 / 1\ Drainage Area (ac): 0.32 Wet Storage Req (cy) : 21.44 -- fl Dry Storage Req (cy): 21.44 Total Storage Req (cy): 42.88 \p1 \ Elev Side 1 Side 2 Area Vol Vol o (sf) (cf) (cy) P' S 1 Low T 1: 1 Point 734.0 8 side slope 7 56.0 / 760 Q 712 Bottom of Weir: 736.0 16 15 240.0 592.0 21.9 wet 3: 1 side slope Top of Weir 739.7 22.8 21.8 497.0 526.5 23.2 dry SCALE : 1" = 4000' \ / X \ Weir Length (ft) : 1 . 9 Weir Height (ft) : 1.7 Top of Berm: 740.7 GENERAL_ EROSION AND SEDIMENT CONTROL NOTES Top of Weir: 739.7 Berm Width (ft): 2.5 ES-1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND ', v SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING / Oti�.ti ti TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625-02-00 EROSION AND SEDIMENT CONTROL REGULATIONS. ES-2: THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE PRE - CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND J 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 PLAN TO THE OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY. ES-6: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION I I I \ 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 AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELPMENT UNTIL FINAL STABILIZATION IS ACHIEVED. I I \ ES-8: DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED I 1 I \\ FILTERING DEVICE. I I 1 I \ ES-9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND I I I \ AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR I \ I I I \\ J CLEMANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL 1 \ I I II \ ADE IMMEDIATELY South Fork Farms I Erosion/Sediment Control Narrative r I March 21, 2005 I PROJEC-' DESCRIPTION The project consists of construction of a road for a rural, large lot, subdivision. The total drainage r,red of 3.5 acres. EXISTING SITE CONDITIONS The site s mostly Pasture. ADJACEJT PROPERTY The road enters the project from state route 705 to the east. The rest of the property is surrounded by rural parcels: 87-16D, 87-16C, 87-16A1, 87-18E.87-22J and 87-16F. OFFSITE AREAS No off-si-.e areas will be disturbed. SOILS Braddock Loom on 7-15Z slopes is a deep, strongly sloping, well drained to excessively drained soil found on ridgetops, points of ridges, and on side slopes. The surface layer is brown sardy loam about 5 inches thick. The substratum is mostly brown and yellow partially weathered bedrock that crushes to sandy loam to a depth of about 60 inches. Permeability is rapid, and available water capacity is low. Surface runoff is rapid. The hazard of erosion is moderate. CRITICAL. EROSION AREAS. There are no critical erosion areas.. EROSION AND SEDIMENT CONTROL MEASURES Unless ct •crwisc indicated, all vegetative and structural erosion and sediment contra! practices will be constructed and maintained according CO minimum standards and specifications of the Virginia Erosion and Sediment Control Handbook (VESCHI. STRUCTURAL PRACTICES 1. Construction Entrance- 3.02 A temporary Construction entrance will be provided upon field determination by the County and the contractor. A temporary paved construction entrance shall be installed at the beginning of the project. 2. Silt Fence- 3.05 A temporary sediment barrier consisting of a synthetic filter fabric stretched across and attached to supporting posts and entrenched. 3. Tom Crary Sediment Trap - 3.13 A small ponding area, formed by construction an earthen embankment with a stone outlet across a drainage swolm. VEGETATIVE PRACTICES 1. Temporary Seeding - 3.31 Establishment of temporary vegetative cover on disturbed areas by seeding with appropriate rapidly growing plants on sites that will not be brought to final grade for pperiods of 30 days to one year. German Millet at 60 Ib./ac., Weeping Lovograss at 3 )b./ac., Korean Lospodozo at 20 Ib./oc. Temporary seeding shall be fertilized. 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 arm available at the extension office and the test costs $6.00). 2. Mulch - 3.35 Organic mulch shall be used In conjunction with seeding operations and shall bo applied at the rate of 2 tons/acre. 3. Dust Control- 3.33 Dust control Measures shall be utilized throughout this site when necessary. Ty [Cal temporary measures include but are not limited to, irrigation, term Crory seeding Darrimrs. These measures will aid in the prevention of harmful airborne substances as well the effects of wind erosion. MANAGEMENT STRATEGIES 3' 1. Construction should be sequenced so that grading operations can begin and end as quickly - as possible. 2. Sedlmont trapping measures shall be installed as a first stop in grading and shall be seeded and mulched immediately following installation. TOP OF BERM = 673.6' 3. The job superintendent shall be responsible for the installation and maintenance of all erosion and sediment control practices, 4. Temporary seeding or other stabilization will follow immediately after grading. 3: 1 3: 1 5. Areas which are not to be disturbed will be clearly marked by flags, signs, otc. PERMANENT STAEILIZATION TOP OF WEIR = 672.6' All areas disturbed by construction will be stabilized with permanent seeding immediately following finish grading. Seeding will be done with Kentucky 31 Toll Fescue according to Std. 9 Spec. 3.32 of The Virginia Erosion f! Sediment Control Handbook. 5-20-10 fertilizer shall be applied at the rate of 1000 lb/ac and lime at 2 tons/oc. Permanently seeded areas shall be protected during establishment with straw mulch (2 tons/ac). mix STORMWATER MANAGEMENT TOPSOIL 6 SAND This is a rural subdivision with negligible change in stormwater peak flows. The largo SAND: 0 . 02-0 . 04 " downPstream silt trap will be converted to a bio-filter to address water quality as shown on 1 I I / / p - - - - (MUSTS BE I SPEC EED BY MAINTENANGEpIat. \ 2.0' \ \ \ \ \ \ \ I \ I 1 - WATER RESOURCES MANAGER 6 In general, all erosion and sediment control measures will be checked weekly and after each \ \0 \ I T \ / i / / = I I J I I EIO-FILTER EROSION CONTROL INSPECTOR) 6" NON -PERFORATED significant rainfall. The following items will be checked in particular: \ \ - - 1 4 OR 6"NON- PERFORATED PVC (see note #2 below) PVC PIPE AT 1% 1) The sediment traps and basins will be cleaned and maintained according to the VESGH. PIPED POSITVE SLOPE _- -. _ ____SLOPE (MIN)TO DAYLIGHT 2) All grcvel outlets will be checked regularly for sediment buildup which will prevent -- _-- -- drainage. If the gravel is clogged by sediment, it shall be removed and cleaned or \ replaced. \ ` Oy _ a \ 70 _ ' - 1 I I I I I SILT TRAP / EIO-FILTER 4"-6" PERFORATED-'UNDERDRAIN GRAVEL BIOFILTER CROSS SECTION 3) Silt fence will be checked regularly for undermining or deterioration of the fabric and 0 PVC PIPE AT 1% (AASHTO M43, 1/2"-1 ") repaired as required. Sediment sball be removed when the level of sediment deposition (converted after stabilization) reaches half wayto the to of the barrier. - - - - - 1 I I I I \ SLOPE (MIN) WRAPPED IN FILTER FABRIC STORMWATER/BMP NOTES p 41 All seeded areas will be checked regularly to see that a good stand is maintained. Areas \ I I \ \ During construction basin will act 05 Silt trap. 1. BMP is not to be constructed until the site is adequately stabilized, according to Water Resources Personnel (434-296-5661) . should be fertilized and reseeded as needed. \ I d d t t k St L f bl l Mi lt -f k B L th t b i l lt -f bi Th 2 ted t e will b b d t t After site is sabilize, basin wie converted . e oier soil mix muse e ucioier x available from Luck or a tested anapproved equivalent pp q MS-1 Stabilization of Denuded Areas and Soil Stockpiles a bio-filter. Silt to be cleaned out, underdrain For addional information contact Water Resoruces Personnel (434-296-5B61) . f Permanent or temporary soil stabilization must be app led to denuded areas within seven days Installed, sod mix added and cover Installed. 3. The sand/soil mix must be stabilized with sod along with the trees and/or shrubs listed on the plan. after final grade is reached on any portion of the site. Temporary soil stabilization shall \ \ \ I Bio-Filter Sizing be applied within seven days to denuded areas that may not be at final grade, but will 24975 sf ultimata imporvious02.5x=625 sP roq 9 1936 sf pd rovide Bio-Filter Planting 1936 sf o 400/ac = le plants \ �'LE,HN _ I I I 6 1.5'col mix Pad Maple/Pin Oak - - - - - 2 2.44 - \ y WATE� - - - \ I / / J J I 12 18' mix Barberry/Spice Bush 12 AC - �d _ DIVERSION orWo_//\ / I I J \ Silt Trap #3 _ Silt trap during construction. I / Drainage Area (ac) : 2.83 / / \ After site is stabilized, trapwil+--b -_onvortod to J I I I I I \ Wet Storage Req (cy) : 189.61 bio-filter. Silt to be cloonod out, updordrain) / I Dry Storage Req (cy): 189.61 installod-zoiLmix added and cover I stalled. / / I I I \ \ Total Storage Req (cy) : 379.22 Elev Side 1 Side 2 Area Vol Vol \ {ilpQ / \ \ (sf) (cf) (cy) S Low Point 666.0 36 36 1296.0 r/ 1: 1 side slope Bottom of Weir: 670.0 44 44 1936.0 6464.0 239.4 wet 3: 1 side slope Top of Weir 672.6 54.4 54.4 2959.4 6364.0 235.7 dr Weir Length (ft) : 21.0 LIMITS OF / V DISTURBANCE Ea 1 1 I I I O 1.69g0F,�� I Q)� I 1 1 I l I I � I \ 9 _ P MP PLANTING SCHEDULE 016) I.5' cal Red Maple • (12) 16' mix Barberry/Spiro bush (bio-filter) 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 24" 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 . 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 6 mulch applied. I EIO-FILTER BEG N / -rr / / / / \ 4 OR 6' PERFORATED PVC I 23+�50C 2 \ (r \ \ w y � � \ � / / / / PIPEo POSITVE SLOPE \ \ \ \ \ �CO/, / WITH CLEANOUTS EVERY 50' i \ ht�dpk \ SOD TURF COVER CLEAN -OUT W/WATERTIGHT CAP 670.0' LT.►Nop- C W . 3Rwn.ae. uneantw,. �n.. 7 W. THOMAS MUNCASTER, JR. CERT. ND. 16242 a */x7/os i 1 A/ Weir Height (ft) . 2.6 Top of Berm: 673.E GRAPHIC SCALE 1"=60' Top of Weir: 672.6 - Berm Width (ft) : 3.0 0 60 120 180 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. Soil stabilization refers to measure which protect soil from the erosive forces of raindrop impact and flowing water. Applicable practices include vegetative establishment, mulching, and the early application of gravel base on areas to be paved. Soil stabilization measures should be selected to be appropriate for the time of year, site conditions and estimated duration of use. MS-4 Timing and stabilization of Sedlmont Trapping Measures Sediment basins and traps, perimeter dikes, sediment barriers and other measures intended to trap sediment shall be constructed as a first step in any land -disturbing activity and shall be made functional before up -slope land disturbance takes place. MS- 5 Stabilization Measures Stabilization measures shall be applied to earthen structuros such as dams, dikes and diversions immediately after installation. MS- 17 Vehicle Across Whoro 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. MS-18 Disposition of Temporary Measures 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 permonently stabilized to prevent further erosion and sedimentation. V rn Co Wm Wrn r R� V WJ o rn N N W w CD 0 J Q Q x U 0 Q vm Q 0 Cr a J 0 w 0 m in z 2 u) H w 0 z Ln o w r, < cu Q N Q O m c z E E o E O [n y U m w 01 0 Q a_ LLI a_ -I Z C C c-D LLIcc Q > C-3 LL T Q Z IL O L_ Z I— O� LL O r-, CZ OD L-J J -C J O :3 Q Q O :5: :�: z J m O U X Q Q z O I--i M LLB DESIGNED BY DATE TM 3/17/05 DRAWN BY DATE TM CHECKED BY DATE FILE EDIT South Fork Forms - SCALE 1 " =60 DRAWING 1: 1 PLOT PROJECT - T OF 1 SHEET NO,