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HomeMy WebLinkAboutWPO201600053 Plan - As-built WPO VSMP 2017-12-04SITE DATA OWNER / DEVELOPER: MARCH MOUNTAIN PROPERTIES LLC CONTACT: DAVE BROCKMAN 1005 HEATHERCROFT CIRCLE, SUITE 100 OLD TRAIL VILLAGE CROZET VA, 22932 CELL: (702)-985-9088 lave@oldtrailvillage.com PLAN PREPARER: ROUDABUSH, GALE, & ASSOCIATES 914 MONTICELLO ROAD CHARLOTTESVILLE, VA. 22902 (434)-977-0205 TAX MAP PARCEL No: - - - - TMP 55E-01-13 ZONING: R-1 RESIDENTIAL, BONUS LEVEL - CLUSTER DEVELOPMENT OF ZMA-04-024 APPROVED ON SEPTEMBER 14, 2005 USE: LOW DENSITY RESIDENTIAL - 43 RESIDENTIAL LOTS BUILDING HEIGHT: NOT TO EXCEED 2.5 STORIES FOR SINGLE FAMILY USE AREA SUMMARIES: LOTS 23. 7 Ac. OPEN SPACE 15.65 Ac. ROADS 2.0 Ac. WALKS/RIBBON 0.9 Ac. TOTAL AREA 42.25 Ac. GROSS RESIDENTIAL 1.02 DWELLING UNITS PER ACRE DENSITY: MAGISTERIAL DISTRICT: WHITE HALL MAGISTERIAL DISTRICT DRAINAGE DISTRICT: LICKINGHOLE CREEK WATERSHED: LICKINGHOLE CREEK TOPOGRAPHY: LOUTBA AEPfAL SURVEYS, AU6UST 26 2 FIELD VERIFIED BY ROUDABUSH, GALE & ASSOC. INC. NOVEMBER, 2017 DATUM: VERTICAL - NAVD 88, HORIZONTAL - NAD 83 CRITICAL SLOPES: NO CRITICAL SLOPES EXIST WITHIN THE PROJECT LIMITS. FLOODPLAIN: THIS PROJECT IS LOCATED WITHIN PORTIONS OF THE FLO(ODPLAIN LIMITS AS SHOWN ON FLOOD INSURANCE RATE MAP COMMMUNITY PANEL NUMBER 510006 0237 D. EFFECTIVE DATE: FEBRUARY 4, 2005. EROSION CONTROL: PHASE I EROSION CONTROL PROVIDED BY THE EXISTING SEDIMENT BASIN CONSTRUCTED WITH SUBDIVISION SWM POND TO BE CONVERTED/CONSTRUCTED DURING DRY WEATHER STORMWATER: ORIGINAL SWM BIO-RETENTION POND, TIMMONS PLAN, REVISED 7-15-04 THIS PLAN SHALL REPLACE THE ORIGINAL BIO-FILTER DESIGN THE PROPOSED SWM FACILITY IS A 4 x NOV WET POND THAT PROVIDES 10 YR POST - 2 YR PRE DEVELOPED CONDITIONS THE SITE IMPERVIOUS COVER IS (4.05 + (4, 500 S.F./LOT x 41 LOTS) /42.25) = 30% ROADWAY: 2.86 ACRES SIDEWALKS: 0.74 ACRES WET POND BMP (NWS) : 0.45 ACRES OVERALL SITE IMPERVIOUSNESS = 8.29 ACRES OR 20% LIGHTING: ALL PROPOSED LIGHTING WILL NOT EXCEED 3,000 LUMENS.. NO EVIDENCE OF A BURIAL SITE WAS FOUND ON THIS PARCEL. THE STREAM BUFFERS) SHOWN HEREON SHALL BE MANAGED IN ACCORDANCE WITH THE ALBEMARLE COUNTY WATER PROTECTION ORDINANCE. THIS SITE IS NOT LOCATED WITHIN AN AGRICULTURAL -FORESTAL DISTRICT. THIS SITE IS LOCATED WITHIN THE WATERSHED OF A PUBLIC WATER SUPPLY RESERVOIR. -09 imp MR I __w 11 rd Field Upper Subdivi io C 0 Z C r VSMP AS� UILT PLAN wpo�� 01600053 , ALBEMARLE COUNTY RECORD DRAWING REQUIREMENTS (AS -BUILT) FOR VSMP (I)ISPO,SITION IN ITALICS) • A SIGNED AND DATED PROFESSIONAL SEAL OF THE PREPARING ENGINEER OR SURVEYOR. (INCLUDED) • THE NAME AND ADDRESS OF THE FIRM AND INDIVIDUAL PREPARING THE DRAWINGS ON THE TITLE SHEET. (INCLUDED) • THE CONSTRUCTED LOCATION OF ALL ITEMS ASSOCIATED WITH EACH FACILITY, AND THE INSPECTION RECORDS TO VERIFY PROPER DIMENSIONS, MATERIALS AND INSTALLATION. THE ITEMS INCLUDE, BUT ARE NOT LIMITED TO THE FOLLOWING: 1. INSPECTION RECORDS AND PHOTOGRAPHS FOR PIPE TRENCHES AND BEDDING, INCLUDING UNDf:-'RDRAINS. (GEOTECH REPORT INCLUDED) 2. VIDEO PIPE INSPECTION IFOR ANY PIPES WHICH ARE NOT ACCESSIBLE OR VIEWABLE. (NOT APPLICABLE) 3. UPDATED LOCATION WITH GEO-COORDINATES OF ALL FACILITIES. (INCLUDED ON SHEET 4A) 4. VERIFIED DRAINAGE AREA MAPS FOR THE DRAINAGE AREA TREATED, AND FOR DRAINAGE TO THE FACILITIES. (INCLUDED) 5. CURRENT PHYSICAL AND TOPOGRAPHIC SURVEY FOR ALL EARTHEN STRUCTURES. PONDS SHOULD INCLUDE A SURVEY OF THE POND BOTTOM. SURVEYS SHOULD VERIFY POND VOLUMES ARE PER DESIGN. CORRECTIONS MAY BE REQUIRED FOR ALTERATIONS FROM THE DESIGN. (INCLUDED) 6. PLANTS, LOCATION AND TYPE. (INCLUDED) 7. PLANS AND PROFILES FOR ALL CULVERTS, PIPES, RISERS, WEIRS AND DRAINAGE STRUCTURES - DISPLAY THE INSTALLED TYPE OF DRAINAGE STRUCTURES, CULVERT/PIPE SIZE, WEIRS, MATERIALS, INLETS OR END TREATMENT(S), INLET AND OUTLET PROTECTION, ALIGNMENT AND INVERT ELEVATIONS COMPARED TO DESIGN. (INCLUDED) 8. COMPUTATIONS: FOR SIGNIFICANT DEVIATIONS FROM DESIGN, PROVIDE SEALED COMPUTATIONS VERIFYING THAT THE AS -BUILT CONDITION IS EQUIVALENT OR BETTER THAN DESIGN. (NOT APPLICABLE) 9. DITCH LINES - DISPLAY THE CONSTRUCTED LOCATION OF ALL DITCH LINES AND CHANNELS, INCLUDING TYPICAL SECTIONS AND LININGS. ((INCLUDED) 10. EASEMENTS - SHOW ALL, PLATTED EASEME NTS WITH DEAD BOOK REFERENCES LABELED. FACILITIES AND DRAINAGE MUST BE WITHIN PLATTED EASEMENTS. PROVIDE COPIES OF RECORDED DOCUMENTS. (SUBMITTED) 11. GUARDRAIL, FENCES OR OTHER SAFETY PROVISIONS - DISPLAY THE CONSTRUCTED LOCATION OF ALL SAFETY PROVISIONS; FENCES, GUARDRAIL, INCLUDING THE TYPE, LENGTH AND APPLIED END TREATMENTS, COMPARED TO DESIGN. (NOT APPLICABLE) 12. MATERIAL LAYERS - BIOFILTER MEDIA, STONE LAYERS, SAND LAYERS, KEYWAYS AND CORES MUST BE VERIFIED AS TO MATERIAL TYPES AND DEPTHS. INCLUDE INSPECTION REPORTS, BORING OR TEST PIT REPORTS AND MATERIALS CERTIFICATIONS. BIOFILTER MEDIA MUST BE: AN APPROVED STATE MIX. (GEOTECH REPORT INCLUDED) 13. ACCESS ROADS -SHOW LOCATION OF ACCESS ROADS, SURFACE TREATMENT, DRAINAGE, ETC, AS APPLICABLE. (N/A) 14. COMPACTION REPORTS ARE REQUIRED TO VERIFY FILL COMPACTION IN DAMS. (GEOTECH REPORT INCLUDED) 15. MANUFACTURERS CERTIFICATIONS FOR PROPRIETARY BMP'S CERTIFYING PROPER INSTALLATION AND FUNCTIONING. (NOT APPLICABLE) SHEET 5 ---------- EROSION NOTES & DETAILS SHEET 5A AS -BUILT EROSION NOTES & DETAILS SHEET 6 ---------- SWIVI PROFILE & VRRM DETAILS SHEET 6A AS -BUILT SWM PROFILE & VRRM DETAILS SHEET 7 ---------- LANDSCAPE PLAN SHEET 7A AS -BUILT LANDSCAPE PLAN )F Lf Tbggart Lic. No. 22841 �<v� O N P, L E.NG APPRO ra J FileVj J'l f) K F1 REVISIONS August 22, 2016 County Comments i October S, 2016 As -Built Plan November 20, 2017 DATE Sept. 18, 2015 111 ■ n R w 0 LLI 1t I PILE NUMBER 8053 SHEET 1/7 II A 22841 SS 0 N AloO REVISIONS August 22, 2015 County Comments October 3, 2015 ,As -Built Man November 20, 2017 DATE Sept. 13, 2015 SCALE 1" = 100' HORZ CONTOUR INTERVAL 2 FOOT FILE NUMBER 3053 SHEET 2/7 NOS, .. ... . .... - - - - --- - - - - - - - - 0 670-- REVISIONS August 22, 2016 County Comments October 3, 2016 As -Built Plan November 20, 2017 DATE Sept. 18, 2015 SCALE 1 100' HORZ CONTOUR INTERVAL 2 FOOT FILE NUMBER 8053 SHEET 3/7 REVISIONS County Comments Octob-er,3--201• DATE \7epl. ! 8y 201 5 SCALE 1 YI9 30' H O RZ CONTOUR INTERVAL 2 FOOT :5 0 Lr- > t CL am 0 z ::) 0 �0 s LIJ LU w 0 ,i U. z 0 0 cc I s M I� FILE NUMBER 8053 SHEET 4J7 i DATE kept. 1 8, 2015 SCALq�E/ y y ill = 30' HORZ CONTOUR INTERVAL 2 FOOT z .q CL �. 0 t f `' CIL„' • cc w ir It~ !6 ri LL �t FILE NUMBER 8053 SHEET' 4A / 7 STONE I UCTION ENTRANCE II 70` MIN,EXISTING Al 3 � PAVEMENT 5:1 v FILTER CLOTH MOUNTABLE BERM 6" MIN. A (OPTI❑NAL) SIDE ELEVATION EXISTING GROUND v iuu s xi COURSE AGGREGATE I B 1 LJJl 11 V L LI\I�il �l�...il� T❑ SEDIMENT TRAPPING DEVICE * MUST EXTEND FULL WIDTH OF INGRESS AND EGRESS PLAN VIEW OPERATION — 12' MIN. FILTER CLOTH SECTION A —A 6'-7"— — REINF❑RCED CONCRETE SECTION i EXISTING PAVEMENT 10' MIN, DRAIN SPACE SOURCE: ADAPTED from 1983 Maryland Standards for Soil erosion and Sediment Control, and Va. DSWC CONSTRUCTION OF A SILT FENCE (WITHOUT WIRE SUPPORT) 1. SET THE STAKES. 2. EXCAVATE A 4"X 4" TRENCH UPSLOPE ALONG THE LINE OF STAKES. , 6'MAX. 3 r it li 1 FLOW 3. STAPLE FILTER MATERIAL TO STAKES AND EXTEND IT INTO THE TRENCH. it FLOW 4. BACKFILL AND COMPACT THE EXCAVATED SOIL. SHEET FLOW INSTALLATION (PERSPECTIVE VIEW) POINTS A SHOULD BE HIGHER THAN POINT B. DRAINAGEWAY INSTALLATION (FRONT ELEVATION) SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control,VA. DSWC PLATE. 3.05-2 Sherwood and Wyant Plate 3.02-1 DD DIVERSION DIKE TEMPORARY DIVERSION DIKE Compacted Soil a'd3r'.. 'Flow TEMPORARY SEEDING MIXTURES FOR Ts THE PIEDMONT AREA TABLE 26 TEMPORARY SEEDINGS BY RATES, DEPTHS, AND DATES Seeding Rate Plantin depth 1L Seedingzones 2 and SeedingDate 3 �) Species W Per Lbs/lOOD 7a and 7b 6b 6a and 5b acre Sq. ft (Inches) 2/1- 5/1- 8/15- 3/1- 5/1- 8/15- 3/15- 6/1- 8/1- 4/30 8/14 11/30 4/30 8/14 11/15 5/31 7/31 10/31 Choose one: BY BY BY Barley 2.5 bu. 2.80 1-2 X - 10/15 X - 10/15 X - 10/1 Oats 3 bu. 2.21 1-2 X - - X - - X - - Rye (4) 2.5 bu. 3.22 1-2 X - X X - X X - X Barley or Rye Plus 150 lbs. 3.45 1 X X 10/15 X X 10/15 X X 10/1 Foxtail X X X X X X X X X millet 5 Weeping lovegross-U6 4 lbs. 0.09 1/4-1/2 - X - - X - - X - Annual Ryegrass 50lbs. 1.15 1/4-1/2 X - 11/1 X - 11/1 X - 8/15 Millet (7) 50lbs. 1.15 1/2 - X - - X - - X - (1) Applicable on slopes of 3:1 or flatter (2) Refer to figure A — Adopted from USDA, ARS Miscellaneous Publication #1475, January 1990 (3) Between fall and spring seeding dates, use mulch only if ground is frozen and reseed when thawed (4) May be used as a nurse crop for late fall/early winter permanent seedings, add 56 Ibs/ac. to the permanent seeding mixture (4) Maryland State Highway Administration Temporary Seed Mix (5) May be used as a nurse crop for mid —summer permanent seedings. Add 2 Ibs/ac to permanent seed mix. (6) May be used as a nurse crop for mid —summer permanent seedings. Add 10 Ibs/ac. to the permanent seeding mix. MAINTENANCE LOG: MAJOR GRADING ACTIVITIES DATE STABILIZiZED CONSTRUCTION AREAS DATE MAINTENANCE OF CONTROLS /ADDITIONS DATE RAINFALL WEEKLY INSPECTIONS PERMANENT SEEDING MIXTURES FOR PS THE PIEDMONT AREA TABLE 25 TOTAL LBS. PER ACRE MINIMUM CARE LAWN -- COMMERCIAL OR RESIDENTIAL 175-200 LBS. - KENTUCKY 31 OR TURF -TYPE TALL FESCUE 95-100% - IMPROVED PERENNIAL RYE GRASS 0-5% - KENTUCKY BLUEGRASS 0-5% HIGH MAINTENANCE LAWN 200-250 LBS. - KENTUCKY 31 OR TURF -TYPE TALL FESCUE 100% GENERAL SLOPE (3:1 OR LESS) - KENTUCKY 31 FESCUE 128 LBS. - RED TOP GRASS 2 LBS. - SEASONAL NURSE CROP* 20 LBS. LOW -MAINTENANCE SLOPE (STEEPER THAN 3:1) - KENTUCKY 31 FESCUE 108 LBS. - RED TOP GRASS 2 LBS. - SEASONAL NURSE CROP* 20 LBS. - CROWN VETCH** 20 LBS. TOTAL 150 LBS. *USE SEASONAL NURSE CROP IN ACCORDANCE WITH SEEDING DATES AS STATED BELOW: FEBRUARY 16TH THROUGH APRIL 30TH. .. . . . . . .. .. ANNUAL RYE MAY 1ST THROUGH AUGUST 15TH .. . .. .... • .. . . .. FOXTAIL MILLET AUGUST 16TH THROUGH OCTOBER 31ST... .. .. ... .ANNUAL RYE NOVEMBER 1ST THROUGH FEBRUARY 15TH . . .... ..ANNUAL RYE ***SUBSTITUTE SERICEA LESPEDEZA FOR CROWNVETCH EAST OF FARMVILLE, VA (MAY THROUGH' SEPTEMBER USE HULLED SERICEA, ALL OTHER PERIODS, USE UNHULLED SERICEA.) IF FLATPEA IS USED IN LIEU OF CROWNVETCH, INCREASE RATE TO 30 LBS./ACRE. ALL LEGUME SEED MUST BE PROPERLY INNOCULATED. WEEPING LOVEGRASS MAY BE ADDED TO ANY SLOPE OR LOW MAINTENANCE MIX DURING WARMER SEEDING PERIODS; ADD 10- 20 LBS./ACRE IN MIXES. PERMANENT SEEDING FERTILIZATION PS AND MAINTENANCE TABLE 24 Maintenance Fertilization for Permanent Seedlings Use Soil Test Recommendation or ,Rates Shown Below Seeding Mixture Formulation Lbs. per Lbs. per Time Mowing Acre 1000 sf Tall fescue makes 10-10-10 500 11.5 Yearly, or as *Not closer than 3" if up 70% or more or 400 9.2 needed fall occasional mowing is of cover. 30-10-10 desired. Spring the year Do not mow crownvetch Crownvetch Service tclespedeza o-20-0 400 9.2 following establishment Birdsfoot trefoil and every 4-5 years thereafter. Fairly uniform Fall the year, Not required. not closer stand of Tall following than 4" if occasional Tescue & Service 5-10-10 500 11.5 establish- ment mowing is desired, and lespedeza, or and every 4-5 then in fall after seed Birdsfoot Trefoil. years thereafter. has matured. Weeping Lovegrass Spring the year Not required. not & Service following closer than 4" if lespedeza fairly 5-10-10 500 11.5 establishment occasional mowing is uniform plant and every 3-4 desired, and fall after distribution years thereafter. sericea has matured. Red & chewings 20-10-10 250 5.8 September, 30 Mow no closer than 2" days later for red fescue and Ky �I fescue, Kentucky December, May bluegrass; and closer bluegrass, hard fescue mixture: 20-10-10 100 2.3 20-June-30, if than 3" for fescue. needed. 1, RISER PIPE BASE CONDITIONS FOR EMBANKMENTS CONCRETE BASE FOR POND EMBANKMENTS 10' OR LESS D 6" A2" �'�2 1=1 IT-1i 11=! 1=1 11=1 I it y'""� a I —111=1 I I —I I I-1 I I—! I I —I 11-1 _ III—III=III—III-- EEI 1=III=1I11=III=11 -1 I I= 111=! 11=1I11 E I' 6'X6' 2D -►- CONCRETE STEEL BASE FOR POND EMBANKMENTS 10' OR LESS D I11=111= 30" D/2- IIIII--III-111=1II—III ==III -III I1I-III-III-III- -1 I I —I 11=111=1 I I —I I I —I 11=111=1 11=1 I =II11-172D - I-11ICI11=T1-i III=1 111- •I 11-1 11-1 I I-1 /4" STEEL PLATE SOURCE: VA. DSWC PLATE. 3.14-14 FERTILIZER: 10-20-10 1,000 LB'S/ACRE SEPTEMBIER-FEBRUARY 15: 50% ANNUAL RYE & 50% WINTER RYE 100 LBS/ACRE FEBRUARY 16-APRIL 30: ANNUAL RYE 100 LBS/ACRE MAY -AUGUST: GERMAN MILLET 50 LBS/ACRE OTHER OPTIONS EXIST, SEE VA EROSION AND SEDIMENT CONTROL HANDBOOK. SUGGESTED PERMANENT SEEDING MIXTURE LIME: 2 TONS/ACRE FERTILIZER: 10-20-10 1,000 LBS/ACRE MARCH -MAY 15: KENTUCKY 31 FESCUE 200 LBS/ACRE, ANNUAL RYE 20 LBS/ACRE MAY 16-AUGUST 15: KENTUCKY 31 FESCUE 200 LBS/ACRE, FOXTAIL MILLET 20 LBS/ACRE AUGUST 16-OCTOBER: KENTUCKY 31 FESCUE 200 LBS/ACRE, ANNUAL RYE 20 LBS/ACRE NOVEMBER-FEBRUARY: KENTUCKY 31 FESCUE 200 LBS/ACRE, WINTER RYE 20 LBS/ACRE r . . N II LOWER POND 7DEPTH CULVERT 10 C.Y. CLRAP OUTFLOW P 18MIN.1n1Sw/UNDERLF.F Q10 = 15 cfs APRON LENGTH = 20' N ;I UPPER POND CULVERT s 7 C.Y. CL 1 RIPRAP OUTFLOW 0 P2 18 MIN. DEPTH _00 30" W/UNDERLYING F.F Q10 = 15 cfs V z APRON LENGTH = 12' 00 ��� �, ci UPPER POND gyp, ,�� CULVERT 1,� z 53 C.Y. CL. I RIPRAP OUTFLOW 0 P 3 O , 18 MIN. DEPTH �, E- 24" W/UNDERLYING F.F Q = 53 cfs 10 z� Jimmy L. Taggart Lic. No. APRON LENGTH = 56' _Po��s 22841 v� J ,, / ONAL REVISIONS } August 22, 2016 County Comments October 3, 2016 GATE Sept. 18, 2015 .� . > W f f It l . :D U. I FILE NUMBER 3053 SHEET a/7 K 70' MIN, — „! EXISTING PAVEMENT SIDE ELEVATION EXISTING GROUND VD❑T #1 P❑SITIVE DRAINAGE COURSE AGGREGATE B TO SEDIMENT TRAPPING DEVICE * MUST EXTEND FULL WIDTH OF INGRESS AND EGRESS PLAN VIEW OPERATION FILTER CLOTH REINFORCED CONCRETE 12' MIN. SECTION A -A MOUNTABLE BERM (❑PTI❑NAL) I A10' MIN, MIEXISTING PAVEMENT 1 10' MIN. J — I DRAIN SPACE SECTION B-B u_ Hewn SOURCE: ADAPTED from 1983 Maryland Standards for you erosion and Sediment Qyniiul, UIIU .u. L111«V CONSTRUCTION OF A SILT FENCE (WITHOUT WIRE SUPPORT) 1. SET THE STAKES. 2. EXCAVATE A 4"X 4" TRENCH UPSLOPE ALONG THE LINE OF STAKES m FLOW 3. STAPLE FILTER MATERIAL TO STAKES AND EXTEND IT INTO THE TRENCH. 4. BACKFILL AND COMPACT THE EXCAVATED SOIL. FLOW SHEET FLOW INSTALLATION (PERSPECTIVE VIEW) I VTnnr I iI POINTS A SHOULD BE HIGHER THAN POINT B. DRAINAGEWAY INSTALLATION (FRONT ELEVATION) SOURCE: Adapted from Installation of Straw and I•abrlc toter barriers for Sediinem t,airn. Sherwood and Wyant 4" 1 PATF 3 (15_i I Compacted Soil IIIII I ! liI �I II �I, I. —Flow Imin. — 4.5' min. ■ PLATE 3.09 TABLE 26 TEMPORARY SEEDINGS BY RATES, DEPTHS, AND DATES Seeding Rate Plantin Seeding zones and Seeding Date depth 1 Species Per Lbs/lOOD ft (Inches) 7a and 7b 6b 6a and 5b 8/15— acre Sq. 4/30 8/14 /30 4/30 8/14 111/15 5/31 7/31 10/31 Choose one: Barley 2.5 bu. 2.80 1-2 X — BY 10/15 X — BY 10/15 X — BY 10/1 Oats Rye (4) 3 bu. 2.5 bu. 2.21 3.22 1-2 1-2 X X — — — X X X — — — X X — — X Barley or Rye Plus 150 lbs. 3.45 1 X X 10/15 X X 10/15 X X X X X 10 1 X Foxtail X X X X X millet 5 Weeping lovegross 4 lbs. 0.09 1/4-1/2 — X — — X X Annual Ryegrass 50lbs. 1. 14-115 2 / / X — 11/1 X — 11/1 X — 8/15 Millet (7) 50lbs. 1.15 1/2 — X — — I X I — — X — (1) Applicable on slopes of 3:1 or flatter (2) Refer to figure A — Adopted from USDA, ARS Miscellaneous Publication #1475, January 1990 (3) Between fall and spring seeding dates, use mulch only if ground is frozen and reseed when thawed (4) May be used as a nurse crop for late fall/early winter permanent seedings, add 56 Ibs/ac. to the permanent seeding mixture (4) Maryland State Highway Administration Temporary Seed Mix (5) May be used as a nurse crop for mid —summer permanent seedings. Add 2 Ibs/ac to permanent seed mix. (6) May be used as a nurse crop for mid —summer permanent seedings. Add 10 Ibs/ac. to the permanent seeding mix. Alnlc � n7-1 MAINTENANCE LOG: 1 STABILIZIZED CONSTRUCTION AREAS DATE MAINTENANCE OF CONTROLS /ADDITIONS DATE RAINFALL WEEKLINSPECTIONS MAJOR GRADING ACTIVITIES DATE E T---- ANTI- VORTEX DEVICE ANTI-- VORTEX DEVICE DESI CN PRESSURE RELIEF HOLES 1/2' DIA. O O SUPPORT ANGLES UPPER ANCHOR TABS/ In n WELDED ATTACHMENT PLAN VIEW D —I 12' LOWER ANCHOR TABS I TACKWELD ALL AROUND 1.5"X1.5"X(7.5' STEEL ANGLE 2 ENTER & BOLT TOGETHER W G1U AN ZED 3/8'X31e BOLTS) IS" LOWER ANCHOR TABS BOLT TO RCP RISER (4 1.5"X1.5'X8" ANGLE (4) 3/8 X2' LVANIZED BOLTS (8) 3/8" WASHERS #6 X 12" — SPACER BAR (TYPICAL) • .w.• • ti •4,. d • RISER DIAMETER SECTION A -A i TABLE 25 TOTAL LBS. PER ACRE MINIMUM CARE LAWN - COMMERCIAL OR RESIDENTIAL 175-200 LBS. - KENTUCKY 31 OR TURF -TYPE TALL FESCUE 95-100% - IMPROVED PERENNIAL RYE GRASS 0-5% - KENTUCKY BLUEGRASS 0-5% HIGH MAINTENANCE LAWN 200-250 LBS. - KENTUCKY 31 OR TURF -TYPE TALL FESCUE 100% GENERAL SLOPE (3:1 OR LESS) - KENTUCKY 31 FESCUE 128 LBS. - RED TOP GRASS 2 LBS' - SEASONAL NURSE CROP* 20 LBS. LOW -MAINTENANCE SLOPE (STEEPER THAN 3:1) - KENTUCKY 31 FESCUE 108 LBS. - RED TOP GRASS 2 LBS. - SEASONAL NURSE CROP* 20 LBS. - CROWN VETCH** 20 LBS. TOTAL 150 LBS. *USE SEASONAL NURSE CROP IN ACCORDANCE WITH SEEDING DATES AS STATED BELOW: FEBRUARY 16TH THROUGH APRIL 30TH. .. . . . ..... . ANNUAL RYE MAY 1ST THROUGH AUGUST 15TH . . . .. . ... ... . .. . FOXTAIL MILLET AUGUST 16TH THROUGH OCTOBER 31ST. ... . ... ...ANNUAL RYE NOVEMBER 1ST THROUGH FEBRUARY 15TH .... , ...ANNUAL RYE ***SUBSTITUTE SERICEA LESPEDEZA FOR CROWNVETCH EAST OF FARMVILLE, VA (MAY THROUGH SEPTEMBER USE HULLED SERICEA, ALL OTHER PERIODS, USE UNHULLED SERICEA.) IF FLATPEA IS USED IN LIEU OF CROWNVETCH, INCREASE RATE TO 30 LBS./ACRE. ALL LEGUME SEED MUST BE PROPERLY INNOCULATED. WEEPING LLUEGRASS MAY BE ADDED TO ANY SLOPE OR LOW MAINTENANCE MIX DURING WARMER SEEDING PERIODS; ADD 10- 20 LBS./ACRE IN MIXES. nPERMANENT SEEDING FERTILIZATION PS Akin KAA1NT1=NANCE TABLE 24 Maintenance Fertilization for Permanent Seedings Use Soil Test Recommendation or Rates Shown Below Seeding Mixture Formulation Lbs. per Lbs. per Time Mowing Acre 1000 sf Tall fescue makes 10-10-10 500 11.5 Yearly, or as *Not closer than 3" if up 70% or more or 400 9.2 needed fall occasional mowing is of cover. 30-10-10 desired. Spring the year Do not mow crownvetch Crownvetch o-20-0 400 g2 following Service lespedeza establishment Birdsfoot trefoil and every 4-5 years thereafter. Fairly uniform Fall the year Not required. not closer stand of Tall following than 4" if occasional Tescue & Service 5-10-10 500 11.5 establish- ment mowing is desired, and lespedeza, or and every 4-5 then in fall after seed Birdsfoot Trefoil. years thereafter. has matured. Weeping Lovegrass Spring the year Not required. not & Service following closer than 4" if lespedeza fairly 5-10-10 500 11.5 establishment occasional mowing is uniform plant and every 3-4 desired, and fall after distribution years thereafter. sericea has matured. September, 30 Mow no closer than 2" Red & chewings 20-10-10 250 5.8 days later for red fescue and Ky fescue, Kentucky December, May bluegrass; and closer bluegrass, hard 20-10-10 100 2.3 20-June-30if , than 3" for fescue. fescue mixture: needed. A TOP STIFFENER (IF REQUIRED) IS_--.X—X—ANGLE WELDED TO TOP AND ORIENTED PER- 0 O PENIDICULAR TO CORRUGATIONS. W 8' MIN. SUPPORT BAR SIZI (,#6 REBAR MIN.) ISOMETRIC TOP IS --GAGE CORRUGATED METAL OR 1 /8" STEEL PLATE. PRESSURE RELIEF HOLES MAY BE OMMITTED, IF ENDS OF CORRUGATIONS ARE LEFT FULLY OPEN WHEN THE TOP IS ATTACHED. CYLINDER IS GAGE CORRUGATED METAL PIPE OR FABRICATED FROM 1/8- STEEL PLATE. NOTES: 1. THE CYLINDER MUST BE FIRMLY FASTENED TO THE TOP OF THE RISER. 2. SUPPORT BARS ARE WELDED TO THE TOP OF THE RISER OR ATTACHED BY STRAPS BOLTED TO TOP OF RISER. RISER PIPE BASE CONDITIONS FOR EMBANKMENTS CONCRETE BASE FOR POND EMBANKMENTS 10' OR LESS D 6" if _�_ — — — — — 11 12" ,._ 0/2 I-_ I I I-_ I I I-! I IEHI I I-1 I I-1 I I-1 I I-1 I I-1 I I- 1-I 11=1 I I -I I I -I I I -I I! -I 11-1 1I— I l-I I I -I I I -III -I i I -I i I -I :III'-i I-11=1I1=1I1- ,I I1-1I1-I I1-11 6'x6' 2D CONCRETE STEEL BASE FOR POND EMBANKMENTS 10' OR LESS D rtitii-rtiSl_ __ —__ —_ _ I I -III- 30" D/2 _ i 1-1 I la � I -I 15711 I -I I F 1 I 1==1 11=11 I-1 I{-1 11=1 11-1 I I- -III-I 1-III-111-! I 1-1I11=111=1 11=1 11- 1 I-111= -III-I I i-III-I 11=1 11=1' :III=11I 1= I ..I 11-1 11- .I 11=1 11=11 f-1 I' 2D —i► 1/4" STEEL PLATE .. SOURCE: VA. DSWC SUGGESTED TEMPORARY SEEDING MIXTURE FERTILIZER: 10-20-10 1,000 LBS/ACRE SEPTEMBER—FEBRUARY 15: 50% ANNUAL RYE & 50% WINTER RYE 100 LBS/ACRE FEBRUARY 16—APRIL 30: ANNUAL RYE 100 LBS/ACRE MAY —AUGUST: GERMAN MILLET 50 LBS/ACRE OTHER OPTIONS EXIST, SEE VA EROSION AND SEDIMENT CONTROL HANDBOOK. SUGGESTED PERMANENT SEEDING MIXTURE LIME: 2 TONS/ACRE FERTILIZER: 10-20-10 1,000 LBS/ACRE MARCH —MAY 15: KENTUCKY 31 FESCUE 200 LBS/ACRE, ANNUAL RYE 20 LBS/ACRE MAY 16—AUGUST 15: KENTUCKY 31 FESCUE 200 LBS/ACRE, FOXTAIL MILLET 20 LBS/ACRE AUGUST 16—OCTOBER: KENTUCKY 31 FESCUE 200 LBS/ACRE, ANNUAL RYE 20 LBS/ACRE NOVEMBER—FEBRUARY: KENTUCKY 31 FESCUE 200 LBS/ACRE, WINTER RYE 20 LBS/ACRE ANTI -SEEP COLLA (2) 5'x5' ANTI SEEP COLLARS SATURATED ZONE CONNECTIONS BETWEEN TH - D E A N TISE EP AN BE THE BARR EL EL MUST ........................................... WATERTIGHT SOURCE: VA. DSWC PLATE. 3.14-- ��'TTI OF y _. r,.j Y Jimmy L. Taggart Lic. No. 10 22841 ONA PLATE. 3. 14— I'1 OUTLET PROTECTION 16, LOWER POND ii 14 CULVERT CL I RIPRAP 6' OUTFLOW o [� o O ' 18 MIN. DEPTH E-18 r w/UNDERLYING F.F Q10 = 15 cfs z APRON LENGTH 23' `7 CULVERTOND _ 7 C.Y. CL I RIPRAP 9' OUTFLOW F72 18" MIN. DEPTH 4-30" O ( W/UNDERLYING F.F Q10 = 15 cfs v APRON LENGTH = +2- 16' 16' I1 r UPPER POND 40 Y.---�� _ TFLOW C.Y. CL I RIPRAP 10'OU24" (� P 3 ~ 18" MIN. DEPTH `- 24 W/UNDRLYING F.F 53 cfs10 APRON LENGTH = 15151 55' EDATE sept. 18, 2015 FILE NUMBER 8053 SHEET 5A/7 U Site Results (Water Quality Compliance) Site Treatment Volume (ft3)11 Runoff Reduction Volume and TP By Drainage Area AI,TH Op YltA Jimmy L. Taggart Lic. No. 22841 'Po��ss i 0 N A 1- 675 670 AC 665 BENCH 655 650 645 RUNOFF REDU(TION 'VOLUME ACHIEVED (ft3) TP LOAD AVAILABLE FOR REMOVAL (lb/yr) TP LOAD REDUCTION ACHIEVED (lb/yr) €P LOAD REMAINING D.A. B D.A. C ( D.A. D D.A, E \ TOTAL 2*0,23 ;: 000.: .. 0,0C) .': 0,00 0.00 20.13 10,37 0„00 0.00. O,Ciil. 0.00 1037 9.75 \ O,i70 0.003 O.QO' Q.003 9 75 Drainage Area Cure Numbers and Runoff Depths* Curve numbers (CN, CiVadj) and runoff depths ( � �e er� are computed with and without reduction practices, Drainage Area A Forest/Open Space-- undisturbed, protected Area (acres forest/open space or reforested land CN Managed Turf -- disturbed, graded for yards or other Area (acres turf to be rnowved/marraged CN Impervious Cover Area (acres CN A Soils B Soils C Soils D Soils Total Area (acres): 23,80 0.00 0.00 9.t}CT 0,00': Runoff Reduction 30 55 70 77 Volume (fit): 0 0,00 18,38 39 Fit 74 80 o,0o 5.42 O.oC? 60,C) 98., 98 98 98: CN(D A. AI 69 1 year storm 2-year storm 10-year storm I RV€)eveloped (watershed -inch) with no Runoff Reductions 0,69 1,Q6, 2.38 RVDavei®ped (watershed -inch) with Runoff Reductions ' 0.69 1.06 2.38 Adjusted CN* 69 69 TOTAL IMPERVIOUS COVER TREATED (ac) '; 5:42'. AREA. CHII OK. TOTAL MANAGED TURF AREA TREATED (ac) _4.6'f AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (lb/yr) 10.37 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (iblyr) 20.13 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 10.37 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (ib/yr) 0.00 'TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. A (11 10.37 ` TOTAL PHOSPHORUS REMAINING .AFTER APPLYING BIVIP LOAD REDUCTIONS IN D.A. A (lb/yr) 9.75 ,SEE M TER QUALITY COMPUA AJ CE 1 O SITE ANCCALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D,A, A (lblyr)0.(}0 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (Ibllyr) TOTAL NITROGEN REMOVED IN D.A. A (lb/yr)39 5R . IIII I 1 n� 1, no-1 � II II II IIII II II I �1III i 1' 191'�III 111 'I' t'I i I I I I (IIIII f'11Y11 III. I I III I III : I I I I. I 11 III III III.III II I I 'II III'I!III':I' II'.IIIII'III III III II IIIII III I. I I 1 I I. IIIII III. .III I :Ili( IIIII I.I: 'I:11 I'I II I I '. I III 11'I I" II II I .I, ( I I I I I:' I I. I I I I I I IIIII I IIII I 'II'�I II I I I '. I'. III �II'I'II Ilil 111 IIIII I II IIII I I II i I I IIII III I'IIIAI IIL.II III IIII III III III III,III I �I I I:' I I. 11 I.. I '' I.. I I f I I' I I I I I I I L f I I I I I I I I I I I I I I 16 I I: I I I f I I I I I. II I p 1 III L I L L1 I I I� I I II 1 I I I I' I I Ia I I I I 11 I I I III I I I I I I �I I � I. i I I 1� I II I 1 I I I I I I II. I ,... I: .. ,. i � II I III 11'I IIIIII.I I , I III11111 I � I I I I I111 .IIII I I I I I I I ,, IIII I II I I : I I I I I I I I I I li I I I I I I II III nu IIII 11 III 111 III IIIIIIII II. ILIIII I I I I I I I I . I' I 1. L I I III I I I II I I I I u I I I LII ull .I I ILiI IIII ,I I I I I L (I I I I I I III'. .i, I I I I I 1 l I I I I -, ti I ( L L ,� I I , 4 I 1 II I I I. I III I I ( I I. I I ,, ; I u I I I• I .I IIII III.III'!II':II (IIIII II.' illllll'llilll lll'.1141 I., i..I III.III IIII �..I III .IIII IIII III II III'. .III IIII 1 I. I III II III11111 III :II'hill .III III IIIII III':11911 DES�N HIGH WAER 100-YR. ST RM ELEV.) E EV=670.39 TOP OF D M = 672.0 EMERGENCY SPILLWAY LEV=669.25 NORMAL POOL RCP RISER CREST ELEV=6 7.75 OTTOM OFF REBAY = 6E 5.00 N f REATMENT OLUME REQUIRED = 32,0 35 CIF TREATMENT VOLUME PRO IDED = 34,1 4 CF BO TOM OF WET POND = 663.00 AVERAGE POND DEPTH REQUIRED 3.25 FT Horizontal Scale: 1 "=20' Vertical Scale: 1 "= 5' EXISTING (GRADE O I\ r7 h m r70CV 0cl�.- 0 L0 r If) N CD II) O CD 4 � CO CD CD C0 CD CD CD Co 0 CD to U (D CD C) Sz `100-YR W S.._E•=670._39 . ---- LZ 10-YR W. .E.=669.02 �Z 2-YR, _W.S E._= ,6-67,94 10 \ AQUATIC BEN H C� 667.0 95.0 LF OF 24" 1 RCP @ 1.05% 675 665 655 650 645 00 0W r)0) 000 00 h rt tp O coMM vid- cD c0 CD cD co co cD cD (.0 C) (D cD C) cD cD LL cD +80 12+00 +20 +40 +60 +80 13+00 +20 +40 +60 +80 DEC) Virginia Runoff Reduction Method New Development Compliance Spreadsheet -Version 3.0 LIMP Design Specifications List: 2011 Stds & Specs Site Summary Total Rainfall = 43 inches Site Land Cover Summary Update Summary Sheef i fij rr:t e 'e','v I Print I _- A soils B Solis C Sails D Soils Totals l of Total Forestlopen (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 18,38 0.00 0.00 18.38 77 Impervious Cover (acres) 0,00 SA2 0,00 0 n0 5.42 23 23.80 100 Site Tv and Land Cover Nutrient Loads Site RV 0-37 Treatment Volume ft' 32,03S TP Load (lb/yr) 20A3 TN Load (lb/yr) 143.99 Total TP Load Reduction Required (lb/yr)10:37 Site Compliance Summary Total Runoff Volume Reduction (ft) 0 Total TP Load Reduction Achieved (lb/yr) 10.37 Total TN Load Reduction Achieved (lb/yr) 39.58 Remaining Post Development TP Load (lb/yr) 9.75 RemainingTP Load Reduction (lb/yr) Required �'Nlofiwthr-,r I P luad ,,,acluaiunrequiret --------------------------------------------- -- ------------------------------------------------------------------------------- Drainage Area Summar+d D.A. A D.A. B D,A. C D.A. D U.A. E Total. Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf (acres) 19.38 0.00 1 0.00 0.00 19.38 Impervious Cover (acres) 5A2 OM 0.00 0.00 0.00 5,42 Total Area (acres) 23,8i7 0.00 0.00 0.00 0.00 23.80 Drainage urea Compliance Summary D,A, A D.A. B D.A. C U.A. D D.A, E Total TP Load Reduced (lblyr) 10.37 0.00 0.00 0.00 0M 10.37 TN Load Reduced (lb/yr) 39.5& 0.00 0.00 0.00 0.00 39.5$ Drainage Area A Summary Land Cover Summary A Soils a Soils C Soils D soils Total % of Total Forest/Open (acres) 0.00 0,00 0,00 0.00 0.00 0 Managed Turf (acres) 0.00 18-38 0.00 0.00 18.38 77 Impervious Cover (acres) 1 0.00 5,42 0.00 0.00 SA2 23 l 23M I BMP Selections I',rianaged "turf Credit Impervious BMP Treatment TP Load from Untreated TP TP Removed TP Remaining Downstream Practice Area (acres) Cover Credit a Volume (ft) Upstream Load to Practice (lb/yr) (Ib/yr) Treatment to be Area (acres) Practices (lbs) (lbs) Employed Total Impervious Cover Treated (acres) 5.42 Total Turf Area Treated (acres) 4.61 Total TP Load Reduction Achieved in D.A, (lb/yr) 10.37 Total TN Load Reduction Achieved in 39.58 D.A. (lb/yr) -------------------------------------------------------------------- ------------------------------ Runoff Volume and CN Calculations; 1-year storm 2-year storm 10-year seorrrt Target Rainfall Event (in) 3.04 3.68 S57 Drainage Areas RV & CN Drainage Area A Drainage Area B Drainage Area C Drainage Area U Drainage Area E cv 69 0 a 0 a 3 RR fit ( ) 1-year return period €tv 0. o RR Iws-in} 0.69 0.C,0 0.00 0.00 OM Rv W RR (Ws-ilti 0.69 0.00 0.00 O.W 0A)ID CN adjusted 69 O 0 0 0 2-year return period RV wo RR (wrs-III) 1.06 OM OM OX0 0,00 av wl RR (ws-in) i,06 O.00 0.00 0.00 0.00 CN adjusted 69 a 0 0 0 10-year return period Rv wo RR (ws-in) 2.38 a.ca 0.00 0,00 €1,60 i;vw RR(ws-inj 2.38 000 0. CU 0-'00 0.00 CN adjusted 69 O 0 0 0 Horizontal Scale: 1 "=20' Vertical Scale: 1 "=5' PROPOSED GRADE EXISTING GRADE TOP OF DAM = 672.00 CRO S-SECTION v \EMERGENCY SPILLWAY 10' C ELE =669.25 2: 1 2:1 \ C NEI FILE NUMBER 8053 SHEET 617 Drainage Area A a=1 =1_ Drainage Area A Land Cover (acres) A Soils B Soils C Soils D Soils Totals Land Cover Rv Forest/Open Space (acres) 0.00 0,00 Managed Turf (acres) 1$.3$ 1$ 38 Cl.2,01 Impervious Cover (acres) - 5:42 5,42 0.95 'otal Phosphorus Available for Removal in D.A. A (lb/yr) 2tI:23, Total 2,3.80 Post Development Treatment Volume in D.A. A {ft) > Stormwater Best Management Practices (RR Runoffeduction) --Select from dropdowrn lists -- Site Results (Water Quality Compliance) RUNOI F REDUCTION VOLUME AC141EVED (fta) TP LOAD AVAILABLE FOR REMOVAL (lb/yr) TP Lt0Ai3 R iOCrCTION ACHIEVED (lb/yr) TP LOAD REMAINING (Ib/yr) D.A. A D.A. B D.A. C D.A. D D.A. E TOTAL 0 0 0 0 20,13 0.00 0.00 0,00 0,04 201i3 1037 0,00 (i3Oi? 0.00 % . :. Q-Qp 10:37 - 9.75 0.00 p.00 : 0.04 t3.00 9.75. x of Ili , v" Elev Ft) Storage(CF) Storage(CY) Storage(Acre-Ft) Area(SF) 663.000 0.000 0.000 0.000 1912.310 664.000 2337.048 86.557 0.054 2774.792 �% 7 665.000 5575.597 206.504 0.128 612.082 Jimmy L. Taggart 666.000 10603.462 392.721 0.243 4733.870 Lic. No. 668.000 45997.297 1703.604 1.056 26770.663 �0 22a41 670.000 103585.683 3836.507 2.378 30858.400 lc fi,SS ENG� 672.000 169593.608 6281.245 3.893 35190.203 1 0 N A L 674.000 244509.203 9055.896 5.613 39766.070 676.000 328820.600 12178.541 7.549 44586.004 675 670 AC 665 BENCH 660 655 650 645 Drainage A,rea Curve Numbers and Runoff Dell Curve numbers (CN, CNadj) and runoff depths (RV L,,,,i,,d) are computed with and without reduction practices. Drainage Area A Forest/Open Space -- undisturbed, protected Area (acres forest/open space or reforested land CN Nlanaged Turf -- disturbed, graded for yards or other Area (acres turf to be mowed/managed CN Impervious Cotter Area (acres CN A Soils B Soils C Soils D Soils Total Area (acres): 2180 0.00 O.fiO O.t7CT ,.: f};00 Runoff Reduction 30 55 70 77 Volume (ftj}: 0 0,00 '18.38 Q,OQ .: 0,000 , 39 61 74 80 0,00 5,42 0,00 0,00' .. 98 98 1 98 93 CN(D A. A) 69 1-year storm 2-year storm 10-year storm RVDeveioped (watershed -inch) with no Runoff Reduction t .69 2.Q 2.3i3 RVneveloped (watershed -inch) with Runoff Reduction* -0,69 1.06 2.38 Adjusted CND` 68 69 69 Area(Acre) 0.044 0.064 0.014 0.109 0.615 0.708 0.808 0.913 1.024 TOTAL IMPERVIOUS COVER TREATED (ac) AREA CHECK: WOK. TOTAL MANAGED TURF AREA. TREATED (ac) ' 4.6i " AREA CHECK., OK. TOTAL PHfi3SPHL3Rtle REMOVAL REQUIRED ON SITE (Ibjjrr 1037 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A, A (lb/yr) 20.13 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (lb yr) '10.37 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (lil 0,00 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. A (lb/yr) 10 37 TOTAL PHOSPHORUS REMAIN INAFTER APPLYING BMP LOAD REDUCTIONS IN D.A. A (lb/yr) 9.75 SEE WATER QUA LITY C01"VIPLIA NCE TAB FOR sirEi"'OMPLIAN ` iQ. TWVS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A ll 39 58 TOTAL NITROGEN REMOVED IN D.A. A (lb/yr) 39'S8 lrl l I n I r� n n ,ni nl Il nrm nl rl Linn.. , nuuurn mull dl l �Ilnrl n: I I I i,�,n ,, rl l I I I Im Ili I v .Inul III I I nl. xrrr:. rl I I ulm.l I I I III II I II I I .III I I II I I I I I II I I I mill I I I I I I II. r� I I I I I I II III 111111.'IIi l'111'.III.II I I I I I l I I II II!'II IIII III IIII Il lrl lull II III II III I'IIIIII III II III I Ill ll if ll I I II I I I I. I i I L. I I I I. I, II' I I p I III I II � III I I� I I I I I I I III I. ,I LI I I I I I I I I I II I II. h I I I■ I L ! I L !. I! I I I I I9 I.111111,WI L I I I. I I l,I I I II III III L LiI:I I. ' I I I V. I I" I II i I IIII � , �.. �� � u l l n,ln II I_l min lul lu urn tl I n .0 I I l lulnllr I nnul.l ml ., '. I. Illlnl u m u nl, r I III II.I. illllll I I ..III 111 � I I I I I. I I. .II I. I I I (I I LI I. I l nlllln.� I I l p I ,l ( I II .I I ; I I I I I 1 I � II I. I, I II I � I�I I .. ^.: I. I �, '.. �. li 1. I I I II I I � .I I ! I� I L i II I tl I II �I � I I � IL t u I I Ii h .I L. i � L, al II ( I: I �11111111111111 I I. l I �I i I I I I I nIIIII a mvu d II, I I I I nr I �. '.III bll'.IILIII II�.a III III in'iII II111116I11'lllll rl I -IlpVm pl il. ,. III l II,III IIII III �. IIII III I III lil nl ' I II IIII III II II II III II IIL DES�N HIGH WAER 100-YR. STORM ELEV.) E EV=670.39 Horizontal Scale: 1 "=20' Vertical Scale: 1 "=15' PROPOSED GRADE EXISTING GRADE r70N 0�� ItoN (.6Ln6 c0 co Ca c0 co co (0 c0 0 cD c0 t, c0 c0 0 TOP OF D M = 673.0 EMER ENCY SPILL AY LEV=��1 669.54 V, 1.00-YR..... W S.E.=67.0.3.9. 00 0QD r70 000 �00 �t(0 O td Ii rri co I�i rri r of o � CDcD�0 coccD0 (((DLL +80 12+00 +20 +40 +60 +80 13+00 +20 +40 675 670 665 655 650 645 +60 +80 DEQ Virginia Runoff Reduction Meatod New Development Compliance Spreadsheet - Version 3.0 SHO Design Specifications List: 2011 Stds & Specs Site Summary Total Rainfall = 43 inches Site Land Cover SurmnarV Update Summary Sheet ....... "..".. i r:.riPrint I A soils B Sails C soils D Soils Totals of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 18.38 0.00 0.00 18.38 77 Impervious Cover (acres) O.GO 5.42 0,00 0,00 5,42 23 23.80 100 Site Tv and Land Cover Nutrient Loads Site Rv 0.37 Treatment Volume (ft) 32,035 TP Load (lb/yr) 20.13 TN Load (Iblyr) 143,99 Total TP Load Reduction Required 10.37 (lb/yr) Site Compliance Summary Total Runoff Volume Reduction (ft) 0 Total TP Load Reduction Achieved 10.37 (lb/yr) Total TN Load Reduction Achieved 39.58 (lb/yr) Remaining Post Development TP Load (Iblyr) 9.75 Remaining TP Load Reduction (Iblyr) Required i'+Its ftra'"th; r TP 10;?d r r ducti i2 ;equJrcd ---- ------------------------------------------------------------------------------------------------------------------------------------------------------------ Drainage Area Summary P.A. A D,A. B D.A. C D.A. 0 P.A, E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf (acres) 13.38 0.00 0.00 0.00 0.00 18.38 Impervious Cover (acres) 5.42 0100 0.00 0.00 0.00 5.42 Total Area (acres) 23.80 0.00 0.00 0.00 0.00 23.80 Drainage Area Compliance Summary D.A. A D.A. B D.A. C k�.A. D D.A. E Total TP Load Reduced (lb/ir) 10.37 0.00 0.00 G.00 0,00 10.37 TN Load Reduced (ib/yr) 39.SS 0.00 O.GO 0.00 0.00 39.58 Drainage Area A Summary Land Cover summary A Soils B soils C Soils D Soils Total % of Total Forest/Open (acres) 0,00 0,00 &00 0.00 0.00 0 Managed Turf (acres) 0.00 18.38 0.00 0.00 18.38 77 Impervious Cover (acres) 0.00 5.42 000 0.00 _ 5-42 23 ( 23.80 I BMP selections Managed Turf Credit Impervious BMP Treatment TP Load from Untreated TP TP Removed TP Remaining Downstream Practice Area (acres) Cover Credit Volume (ft') Upstream Load to Practice (lb/(r) (lb/yr) Treatment to be Area (acres) Practices (lbs) (Ibs) Employed Total Impervious Cover Treated (acres) 5.42 Total Turf Area Treated (acres) 4,61 Total TP Load Reduction Achieved in D,A. (Ib/yr) 10.37 Total TN Load Reduction Achieved in D.A. (Iblyr) 39.58 Runoff Volume and CN Calculation& 1-year storm 2-year storm 10-year storm Target Rainfall Event (in) 3.04 3.a8 5.57 Drainage Areas RV & CN Drainage Area A Drainage Area B Drainage Area L Drainage Area D drainage Area E CN 69 0 0 Q G RR (ft�) © 0 0 0 1-year return period RV we RR (ws-in) 0.69 0.00 0,00 0,00 0-00 Rv *a, RR (ws-iri) 0.69 (1 0 0,W 0.00 0,00 CN adjusted 69 0 0 0 O 2-year return period RV wo RR (ws-in) 1.06 0.00 OM 0,00 0,00 Rv rJ tare (ws-in) 1,06 0.00 0.00 0.00 0.00 rp, adjusted 69 0 0 0 0 10-year return period RV we RR (ws-in) 238 (1.00 D,W 0.00 OM Rvw RR(ws-ir5} 2.38 0.00 0.W 0,00 O.GO CN adjusted 69 G 0 0 0 Horizontal Scale: 1"=20' Vertical Scale: 1 "=5' PROPOSED GRADE EXISTING GRADE TOP OF DAM = rn7 673.05 ClS-SECTION /40, EMERGENCY SPILLWAY-'- K�j ELE =669-2F)- 2:1 2:1 669.54 C \ I REVISIONS l August 22, 2016 County Comments October 3, 2016 II As -Built Plan November 20, 2017 DATE Sept. 18, 2015 .4. 1� 4' i� FILE NUMBER i 8053 SHEET +6A / 7 10 ' ( / / \ � | 7-Y __ (� ` U / /—uO� ��D| '~ '� / , \ \ \ \ \ _ -��--/--------------' ^ RETENTION POND PLANT MATERIALS Scientific Name Common Name Zone Form Inundation Tolerance Notes Hibiscus moscheutos Marsh Hibiscus 2,3 Emergent up to 3 in I GAL. TO.C. Typhaspp. Cattail 2,3 Emergent up to I ft 2" PLUG 24" O.C. Valisneria americana Wild Celery I Sub mergent yes 2" PLUG 24" O.C. ' ZONE SUBK8ERGENTAUUAT|CVEGETAT|ON ZONE ` 2 SHALLOW WATER BENCH 6'12"DEEP � \ZONE 3 - SHORELINE FRINGE- REGULARLY INUNDATED AREA ` ` ` ` \ *~ ~ ` [-�-`|}` FEN ZW, A ANHOLE TO 13E RAISED 11011 00 mv OODPLAIN qa 100—YR FL 1.\ EXPOSED SOILS ON ON POND SIDE SLOPES ABOVE or after major PERMANENT POOL ELEVATION SHALL BE STABILIZED WITH ~~Quarterly LH Remove debris and blockages SPECIFIED SEED MIXTURES, STABILIZATION MATTING, MULCH, 1 storms ETC. IN ACCORDANCE WITH APPROVED PLANS.`4`` .� `�7 ''Repair ���� \3�}�� DITCH undercut, eroded, and 2 \ CONTRACTOR SHALL VERIFY APPROPRIATE SPACING 0F '/ �� \ / ' /-7 \ -/ / ' c��(`7-|/lK] ' ` ' � ), ' SECTION bare soff areas of rainfall) " PLANTS ARE INSTALLED ON AQUATIC BENCH AND / \-----/ / '`''` � ` ' -� -` POND BUFFER IN ACCORDANCE WITH APPROVED PLANS. .^~ / | , / � ' / `� ./- � ��TC� �Ep��=24" `^ `' -' ^ ` \ 3.\ ALL EROSION AND SEDIMENT CONTROL PRACTICES SHALLShoreline \ cleanup to remove trash, oc ncxxuvcu rF\mn /v rL/An/ xxo//�u-�/mm. / ' / `` �[�^!r�! �^-- '` \ `1 4.\ FOLLOW UP INSPECTION AND AS -BUILT SURVEY SHALL BE / `` / � / `~ '/ r~ `` \ ' SCHEDULED UPON COMPLETION OF RETENTION POND ' . `ll \ ` EXIST. {)R/\SS LIN|NG Open up the rLser to access and test the valves Repair broken mechanical components, if needed Pond buffer and aquatic bench reinforcement plantings Forebay Sediment Removal Repair pipes, the riser and SDiltway. as needed Annually Annually One time _/| ' fhp ~ second year following ^' C0D8hnrfioD EveTY 5 to 7VeOIs From 5 to 25 years / . / / \ / REVISIONS County Comments FILE NUMBER 8053 SHEET 7/7 , ,w 1 I i� \S_ NV.(JN)=656.11(OT,;3- \"\ �v LANDSCAPE N TE " l: � o �: � ...,. INV.(OUT) 655.58, \� RETENTION POND PLANT MATERIALS Scientific Name Common Name Zone Form Inundation Tolerance Notes Hibiscus moscheutos Marsh Hibiscus 2,3 Emergent LIP to 3 in 1 GAL. 4' O.C. Panicum vir atom Switchgrass 2,3 Emergent up to 3 in 1 GAL. Y O.C. Typhas Cattail 2,3 Emer ent up to 1 ft 2" PLUG 24" O.C. Elodea canadenis Waterweed 1 Submer ent ves LIVE STEM 18" O.C. Valisneria americana Wild Celery I Submer ent yes 2" PLUG 24" O.C. 1.) EXPOSED SOILS ON ON POND SIDE SLOPES ABOVE _ PERMANENT POOL ELEVATION SHALL BE STABILIZED WITH L SPECIFIED SEED MIXTURES, STABILIZATION MATTING, MULCH, ETC. IN ACCORDANCE WITH APPROVED PLANS. 2.) CONTRACTOR SHALL VERIFY APPROPRIATE SPACING OF 3-4 �\ PLANTS ARE INSTALLED ON AQUATIC BENCH AND �� > POND BUFFER IN ACCORDANCE WITH APPROVED PLANS. 3.) ALL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE REMOVED PRIOR TO PLANT INSTALLATION. 4.) FOLLOW UP INSPECTION AND AS -BUILT SURVEY SHALL BE RETENTION POND MAINTENANCE SCHEDULE Maintenance Items Frequency Quarterly or after major Remove debris and blockages storms Repair undercut, eroded, and (> l inch of rainfall) bare soil areas — Mowing embankment Twice a year Shoreline cleanup to remove trash, Annually debris and floatables A full maintenance inspection Annually Open up the riser to access and Annually test the valves Repair broken mechanical Annually components, if needed One time —during the Pond buffer and aquatic bench second year following reinforcement plantings construction Forebay Sediment Removal Every 5 to 7 years Repair pipes, the riser and spillway, as needed From 5 to 25 years REVISIONS August 22, 2016 County Comments October 8, 2016 As -Built Plan November 20, 2017 DATE Sept. 18, 2015 ti LLJ ti t f - 0 0 �t FILE NLJkBeR 8053 SHEET 7A / 7 I