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HomeMy WebLinkAboutWPO202100006 Plan - VSMP 2021-11-12 (3)@ 2020 - 30 LLC FOOTHILL FARM MAINTENANCE BUILDING VIRGINIA STORMWATER MANAGEMENT PROGRAM (VSMP) PLAN AMENDMENT WPO 202100006 I MP 62-71 ABBREVIATIONS SYMBOLS ALBEMARLE C UN Y, VIRGINIA RIVANNA MAGISTERIAL DISTRICT AC ACRE ADA AMERICANS WITH DISABILITIES ACT ARV AIR RELEASE VALVE BF BASEMENT FLOOR BM BENCH MARK BW BOTTOM OF WALL (AT GROUND LEVEL) CFS CUBIC FEET PER SECOND CG-12 ADA ACCESSIBLE CURB RAMP (VDOT STANDARD) CL CLASS CMP CORRUGATED METAL PIPE CO SANITARY SEWER CLEANOUT CONC CONCRETE CY CUBIC YARDS DB/PG DEED BOOK/PAGE DEQ VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY DIP DUCTILE IRON PIPE DOM DOMESTIC E&S EROSION AND SEDIMENT CONTROL EL, ELEV ELEVATION EP, EOP EDGE OF PAVEMENT ESMT EASEMENT EW END WALL EX EXISTING FF FIRST FLOOR FH FIRE HYDRANT FM FORCE MAIN FPS FEET PER SECOND GSF GROSS SQUARE FEET GW GUY WIRE HDPE HIGH -DENSITY POLYETHYLENE PIPE HP HIGH POINT HT HEIGHT INV INVERT IRF IRON ROD FOUND IRS IRON ROD SET L LENGTH LAT LATERAL LF LINEAR FEET LP LOW POINT LT LEFT MAX MAXIMUM MH MANHOLE MIN MINIMUM NSF NET SQUARE FEET NTS NOT TO SCALE OHE OVERHEAD ELECTRIC PC POINT OF CURVATURE PERF PERFORATED PL PROPERTY LINE PROP PROPOSED PSI POUNDS PER SQUARE INCH PT POINT OF TANGENCY PVC POINT OF VERTICAL CURVATURE PVC POLYVINYL CHLORIDE PIPE PVI POINT OF VERTICAL INTERSECTION PVT POINT OF VERTICAL TANGENCY R RADIUS R/W RIGHT-OF-WAY RCP REINFORCED CONCRETE PIPE RED REDUCER RPA RESOURCE PROTECTION AREA RT RIGHT RTE ROUTE SAN SANITARY SEWER SD SIGHT DISTANCE SDR STANDARD DIMENSION RATIO STA STATION SVC SERVICE SW SIDEWALK SWM STORMWATER MANAGEMENT T TRANSFORMER TBR TO BE REMOVED TC TOP OF CURB TP TELEPHONE PEDESTAL TW TOP OF WALL UG UNDERGROUND UGE UNDERGROUND ELECTRIC UGT UNDERGROUND TELEPHONE/FIBER LINE UGU UNDERGROUND UTILITY VDOT VIRGINIA DEPARTMENT OF TRANSPORTATION VESCH VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK VSMP VIRGINIA STORMWATER MANAGEMENT PROGRAM WM WATER METER WTR WATER WV WATER VALVE I VDOT STD. EC-2 DITCH LINING VDOT STD. EC-3 DITCH LINING --498-- -12- CONTOUR LINE WITH ELEVATION 12 STORM SEWER STRUCTURE IDENTIFIER OSANITARY SEWER STRUCTURE IDENTIFIER BENCHMARK, TEST PIT OMANHOLE WITH FRAME AND COVER + 65 7 + 6q5 7 SPOT ELEVATION Dx ADA PARKING SYMBOL @ WATER CROCK/METER 4- FIRE HYDRANT o • WATER VALVE - - WATERMAIN SANITARY SEWER MAIN r� STORM SEWER -__- PROPERTY LINE/RIGHT-OF-WAY LINE -_- CENTERLINE FENCE LINE EASEMENT LINE WPO AMENDMENT NARRATIVE THE MAINTENANCE BUILDING HAS BEEN SHIFTED APPROXIMATELY 70 FEET NORTH AND 60 FEET EAST. AS A RESULT, THERE IS A 534-SF INCREASE IN IMPERVIOUS AREA DUE TO THE ADDITIONAL STONE ACCESS DRIVEWAY TO THE MAINTENANCE BUILDING. TO OFFSET THE MINOR INCREASE IN IMPERVIOUS AREA, THE OWNER IS PROPOSING AN AGRICULTURAL EXEMPTION FOR AN APPROXIMATE 0.02 AC. (1,034-SF) PORTION OF THE FUTURE PLANNED RELOCATED/SHORTENED FARM ACCESS ROAD THAT WILL BE SHARED WITH THE MAINTENANCE BUILDING STONE ACCESS. AS A RESULT, THE NET IMPERVIOUS AREA WILL NOT BE INCREASED AND NO ADDITIONAL PHOSPHORUS REDUCTION IS REQUIRED. PLEASE NOTE THAT THE OWNER HAS ALREADY PURCHASED 0.42 LBS/YR OF NUTRIENT CREDITS ON APRIL 15, 2021. REFER TO PROOF OF PURCHASE ON SHEET 4. ALBEMARLE CITY OF COUNTY CHARLOTTESVILLE FOOTHILL FARM DRIVE DARDENTOWE O�� J�� SITE PARK ° N SRO°T� 0) VICINITYVICINITY MAP SCALE: 1 "=2000' OWNER: TOBIAS A DENGEL TRUST 1740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 ENGINEER: 30 SCALE, LLC 871 JUSTIN DRIVE PALMYRA, VA 22963 434-242-2866 ATTN: MICHAEL MYERS, PE, CFM RESPONSIBLE LAND DISTURBER DEREK TRIMINGHAM (CERT NO. 33125) LIMITS OF DISTURBANCE = 0.68 AC, WA ERS D = RI ANNA RIV AN MEADOW CREEK HUG GUDE = JR-14 REVISIONS # DESCRIPTION DATE SHEET INDEX # SHEET TITLE 1 COVER SHEET 2 EXISTING CONDITIONS 3 EROSION AND SEDIMENT CONTROL PLAN 4 ESC-SWM NARRATIVE AND DETAILS 5 GRADING-SWM PLAN 6 DRAINAGE DIVIDES 7 DITCH AND CULVERT CALCULATIONS PROPERTY INFORMATION: TAX MAP AND PARCEL: 62-71 OWNER: T AS A DENGEL TRUST AND LYNN T DENGEL TRUST SITE AREA: 187.32 AC SOURCE OF TITLE: DB 5107 PG 651 TOPOGRAPHIC SURVEY ROGER RAY AND ASSOCIATES, NOVEMBER 4, 2020 BOUNDARY SURVEY PLAT OF RECORD DATUM: NAVD 1988 CITY/STATE ALBEMARLE COUNTY, VIRGINIA ZONING: RA FLOODPLAIN NOTE: THE PROPERTY IS LOCATED IN ZONE "X", AN AREA DETERMINED TO BE OUTSIDE THE 0.2% ANNUAL CHANCE FLOOD PLAIN AS SHOWN ON FEMA MAP NO. 51003CO295D, EFFECTIVE DATE FEBRUARY 4, 2005. VRRM SPREADSHEET Virginia Runoff Reduction Method Worksheet DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet - Version 3.0 BMP Design Specificotions List: 2013 Draft Stds & Specs Site Summary Project Title: WP0202100006 - Foothill Farm Maint. Bldg. Date:44511 Total Rainfall = 43 inches Site Land Cover Summary A soils B Soils 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 0.44 0.00 0.00 0.44 67 Impervious Cover (acres) 0.00 0.22 0.00 0.00 0.22 33 0.66 100 Site Tv and Land Cover Nutrient Loads Site Rv 0.45 Treatment Volume ft3 1,078 TP Load (lb/yr) 0.68 TN Load (lb/yr) 4.85 Total TP Load Reduction Required (lb/yr) 0.41 Site Compliance Summary Total Runoff Volume Reduction (ft3) 0 Total TP Load Reduction Achieved (lb/yr) 0.00 Total TN Load Reduction Achieved (lb/yr) 0.00 Remaining Post Development TP Load (lb/yr) 0.68 Remaining TP Load Reduction (Ib/yr) Required 7 0.41 Summary Pnnt � w w 0.42 LB/YR OF PHOSPHORUS CREDIT WAS PURCHASED BY THE OWNERS TOBIAS AND LYNN DENGEL ON APRIL 15, 2021. SEE PROOF OF PURCHASE ON SHEET 4. WITH THIS AMENDMENT, NO ADDITIONAL NUTRIENT CREDIT PURCHASE IS REQUIRED. REFER TO CALCULATIONS ON SHEET 5. Om SCALE ENGINEERING fowner : TOBIAS A DENGEL TRUST 740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 engineer: 30 SCALE, LLC I871 JUSTIN DRIVE PALMYRA, VA 22963 p: 434.242.2866 e: mike@30scale.com web: www.30scale.com I-_ (7 2 z o - W z J �Z) W LU U > z 7Q z LU _z 2 W z G W LL Q �J J o = U 0 z 0 LL L / Lic. No. 33028 o 11/12/2021 tiIONA sheet title: COVER SHEET Iscale: 111=20' date: 11/12/2021 1 sheet # 1 OF 7 y © 2021 - 30 LLC l 3'1@N EXISTING SOILS INFORMATION SOURCE: WEB SOILS SURVEY BY NRCS Custom Soil Resource Report ry Soil Map TBSJ TCYA TJYfD TlT1p TdfIIJ )Aip° TSORI T2NM 3 K pSmle: 1:1,GID rp WWm A pwW&(&S" z 11") Meet Mks k N 6 5 3D sD 90 A —Feet 6 45 so 18D270 N@ppojamm: WPb Memlor CmermortreRs: WGS84 E79e8a: UIM Zm 17N]N WG584 9 Map Unit Legend 31 rl 8•J 8N 3 SI N Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 71C 71 D Rabun clay loam, 7 to 15 percent slopes 0.1 2.1 6.1% 86.1 % Rabun day loam, 15 to 25 percent slopes 720 Rabun clay, 7 to 15 percent slopes, severely eroded 0.2 7.8% Totals for Area of Interest 2.4 100.0% KEY v v v v v CRITICAL SLOPES (PER ALBEMARLE COUNTY GIS) vvvv SOILS TYPE BOUNDARY 71C NRCS SOILS TYPE NOTES 1. NO DETERMINATION WAS MADE AS TO THE LOCATION OR EXISTENCE OF UNDERGROUND UTILITIES. CALL MISS UTILITY BEFORE ANY GROUND DISTURBING ACTIVITIES. 2. TAX MAP 62 PARCEL 73B IS SUBJECT TO THE FOLLOWING: A. EASEMENTS TO VIRGINIA ELECTRIC AND POWER COMPANY (D.B. 689-553 & D.B. 615-389). B. 30' R/W (D.B. 1088-693 PLAT). 3. NO TITLE REPORT FURNISHED. THIS PROPERTY SUBJECT TO ANY CONDITIONS, UTILITIES, EASEMENTS, AND/OR COVENANTS THAT MAY EXIST. REVISIONS # DESCRIPTION DATE TOBIAS A DENGEL TRUST_ TMP 62-71B7 , \� \ \� \ \\ \ \e'e]\ \\� — _ _ _ — — — _ / — / LYNN T DENGEL TRUST \ — JOAN W.MILLER \ \ \\ o2a�\ ` -� _ — — — — — ZONE: RA r ZONE: RA I \ \\ \\\ \\ \\\�` \ ` �_ _ — — D 6x LG ESS — — USE: RESIDENTIAL DB 3775 PG 573 0 \ \ \ \�\\ \\ _ _ — _ — J— � - — DB 607 PG 490 PLAT EM 575 tT \ �\ \��� \\ CHIMNEY 1 STORY LIMITSOF\JPISTtiR$AidEE ,�\.,�\� FRAME STONE I \ ' WALK \ \ \ \ � � \ \ � EG ' ---- \BFMNU -—� -\ � BMW \\ S88:00'S$'�`12555� \ \ \ \ \ TM--46,2-7 — \\ TOBIAS A. DENGEL ST &LYNN T. \ \\\ \ _ _ — _ — — — — —f DENGEL TR � S — \\ AB. 5158-751-A & 52 �LAT D.B. 5107-65 \ I \ — — D.B. 5040 69 \/ / — — 560 _ — \\\ \ — 'D.B. 1088-693 & �94 P11T71D — _ _� — _-----_-- — f_ _545— // R=1]5.00' pDp DDp \ / / �� I 0// T=28.5fi' D p DDp DDp \ \ / 1 .L/ / / / / / / \ \ _ J C=56.3T p D D O '.B=N5]°15'44'W D p pD p pD D p p °D ppp pD pDD DD D \ e �pD° DDD DDD pDp \ �/ /v// / / —/ =w— � DD v p DD v v DD p p DD 1 TICAL SLOPES PER ALBEMARLE COUNTY GIS \ - / / \ \ \ \ \ D p pD D , pp D DDDDppOD DD °DDp \ \ � \ D D D pD°DDD° D DDD D DDD D DDD D D D°DDD ° ° D / / / / � � / / / / / �/ / ////������ �/�/ � � \ • � DDDD DDp DDp SPRING SPRI� 99. IR \47 \ \ T = .2 08' C =6024' \ \ CB=N51°35'28"W / \ CULVERT \ J� 71, \ OL�j7-9 D TMP 62-77 \ \ \ "=N38°32'25"W RICHARD G MILLER III ZONE: RA USE: RESIDENTIAL \ \ \ \ \ PRo iT� TMP 62-76A DB 625 PC 589 \ \ va5o.3T BW BROWN \ \ / / ZONE: RA S81°,64TW 45.2T \ USE: RESIDENTIAL \ \ \ DB 1891 PG 690 EXISTING CONDITIONS 0 30 60 90 SCALE: 1 "=30' i i EMSCALE ENGINEERING owner: TOBIAS A DENGEL TRUST 1740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 engineer: 30 SCALE, LLC 871 JUSTIN DRIVE PALMYRA, VA 22963 p: 434.242.2866 e: mike@30scale.com web: www.30scale.com a I — 0 0 W 0 U) 0 Z 0 0 Of z J 0. V 0 z LJJ G Q LL J Z 0 0 LL 0 z Z) O U w J LU W 100 Q nti CV ri1 ►E sheet title: EXISTING CONDITIONS scale: 111=30' date: 11 /12/2021 I sheet # 2OF7 @ 2021 - 30 LLC EROSION AND SEDIMENT CONTROL LEGEND STD# ABBREV. SYMBOL E&S PRACTICE 3.02 CE ==III CONSTRUCTION ENTRANCE 3.05 SF X-X- SILT FENCE 3.08 CIP CULVERT INLET PROTECTION 3.09 TEMPORARY DIVERSION DIKE 3.13 ST ++ TEMPORARY SEDIMENT TRAP 3.18 OPCEMM OUTLET PROTECTION 3.31 TS TEMPORARY SEEDING 3.32 PS Rs PERMANENT SEEDING 3.35 MU}- MULCH 3.38 TP R TREE PROTECTION LOD LT. LT. R� LIMITS OF DISTURBANCE TEMPORARY SEDIMENT TRAP COMPUTATIONS SEDIMENTTRAP COMPUTATIONS WET DRY WET ST DA STORAGE STORAGE STORAGE DRY STORAGE BOTTOM TRAP CLEANOUT PROVIDED DIMENSIONS ELEV REQUIRED REQUIRED PROVIDED # (AC) (CF) (CF) (CF) (CF) 1 1.85 3347 3347 3806 3923 21 X 55 553.0 (SEE PLAN) 1992 3.36 TYPICAL TREATMENT- 2 SOIL STABILIZATION MATTING SLOPE INSTALLATION FILL SLOPE SECTION' , a SOIL STABILIZATION MATS SHOULD � / JA� �' BE INSTALLED VF Q �� Q 5• i jiLZTE; SLOPE BffLY DONTISLOPE FOR BEST RESULTS. A / BESURFACE SHOO E SMOOTH p 1J r A Q AND FREE OF ROC NNE/ GRASS AND DIRT, CRASS A KILL T FLAT BE PLACED \Yf PON ROPPEERRFSDEL FOR CONTACT. O TOE MAINTAIN SLOPE ANGLE SLOPE LINING (WET SLOPE) TREATMENT - 2_ POLYPROPELYENE NON -WOVEN (NEEDLE PUNCHED) - GEOTEMILE FILTER CLOT" 0IIND TRFATM DNr - 2) \ FF OF CUT SLOPE Q \dRT $HALL BIE TO LA)ING PRIOR To un"c TOP uv wcR BERM TRENCH IWO BERM AND PROGRESS DOWNSLOPE SLOPE LINING DP OF Wi SLOPE (DRY SLOPE) TREATMENT - BOTTOM OF FILL SLOPE REM BOTTOM OF CUT SLOPE 2' Source: VDOT Road and Bridge Standards Plate 3.36-5 EC-2 DETAIL DETAIL TAKEN FROM VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK - SOIL STABILIZATION TREATMENT 1 (EQUIVALENT TO VDOT STD. EC-2) 1992 TEMPORARY SEDIME, TOP OF EMBANKMENT = 558.0 CREST OF ORIGINAL WEIR = 557.0 GROUND CROU \67 CU. YD./ACRE A BOTTOM OF WEIR = 555.0� 67 CU. YD./ACRE 3.13 TRAP WIDTH=3.0'6.90 - ^^\ �� VARIABLE BOTTOM (IXCAVATED) `MAR ( OF TRAP - FILTER CLOTH CRIGINAL GROUND 551.0 E"E -SEE PLATE 3.13-1 COARSE AGGREGATE' CLASS I RIPRAP CROSS SECTION OF OUTLET CLASS I RIPRAP LENGTH (IN FEET) = 12' a x D6) NICE AREA ft-,ma (IN AC.) /ONERSION DIKE COARSE AGFRECIITE ` /// � ExAAffD /FILTER AREA CLOTH 1��� / ..COARSE AGGREGATE SHALL BE VDOT #'3, #357 OR 15 OUTLET (PERSPECTIVE VIEW) / Source: Va. DSWC Plate 3.13-2 5 1) TEMPORARY SEDIMENT TRAP 1992 VESCH STD. 3.13 FENCING AND DRIP LINE SNOW FENCE BOARD FENCE ORING CORD CORRECT METHODS OF TREE FENCIVG dam_ CORRECT TRUNK ARMORING TRIANGULAR BOARD FENCE REVISIONS # DESCRIPTION DATE TREE PROTECTION VESCH STD. 3.38 3.38 - - - - - - - -7 di _ LIMITS OF DISTURBANCE _ / 1,41Y - 0.68 AC. Mgt - / TMP 62-71 - \ \S� \ TP TA �/TP=�-41111 TOBIAS A DENGEL TRUST & / - \ i low ` 76 LYNN T DENGEL TRUST \ 75 ZONE: RA _ 73 74 + � USE: RURAL AREAS 72 ® _ - _ DB 5107 PG 651 - /, \ \ \ 72 720 TO 1 71 71 0 /'' 71 0' 710 o +k NI ® / - \ / 1� 0+ w / / - -- -- - -- - N -565- - - - - - - �� _ 32 / - ----- ------ ----- ----off %46, Mp`1N NGAN w \® p BUILD :09 1 20 A' M - \ P- _416\ -- "- wrn -------- � - D 1 570 \ 2000 65 AROUNp SHE + 7 0 2WR5 + / ! o a 1AP 5g8' 700- / _ 56 R/�Fwq �3pR 0 �_ 60 705+ ti - \ 57 � sS o + ■ ® + O� 6 4, a CIP SR �SR +70� � � 6 \ _ �' g 565 i 44' - PROP 15" HDPE @ 1.13% 8 62 IF roro 656 A E - 61 65 -� N 6p PROVIDE WATER SOURCE TO CLEAN CONSTRUCTION VEHICLES BEFORE 1 65 LEAVING THE SITE. DIRECT WASH 1 1 57 WATER TOWARD SEDIMENT TRAP 1 ON IS 1L..J/ 1.V/ / \ - 560 - _ (� T 55 ® I 55 If \ / \ 58 58 - - - - - - - \ / / X 55 I X X - I 12' �-x } 555 - \ BOTTOM OF TRAP =551.0 TM 62-73B / WET STORAGE = 3.806 CF I / `)BIAS A. DENGEL TRUST &LYNN T. / l @ EL = 555.0 � � TOP OF T-WIDE EMBANKMENT = 558.0 DENGEL TRUST // DRY STORAGE = 3,923 CF O.B. 5158-751-A & 752 PLAT D.B. @ EL = 557.0 _ 5107-651 D.B. 5040-669 D.B. 1088-693 & 694 PLAT _ I 550 - CL I RIP -RAP OVERFLOW WEIR / / I BOTTOM OF WEIR = 555.0 / TOP OF WEIR = 557.0 I / / / I EROSION AND SEDIMENT CONTROL PLAN 0 20 40 60 SCALE: 1 "=20' 1992 3.08 CIP SILT FENCE CULVERT INLET PROTECTION 'DISTANCE IS 6' MINIMUM IF FLAW IS TOWARD EMBAMMENT ROW CULVERT INLET PROTECTION VESCH STD. 3.08 TEMPORARY DIVERSION DIKE DD) TEMPORARY DIVERSION DIKE VESCH STD. 3.09 Om SCA LE ENGINEERING fowner : TOBIAS A DENGEL TRUST 740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 engineer: 30 SCALE, LLC 871 JUSTIN DRIVE PALMYRA, VA 22963 p: 434.242.2866 e: mike@30scale.com web: www.30scale.com z J J ' v, 0 ) Z Z O Q F W ti w C � c 0 � w U Q LL Z Q J O O�/ = H W U O J a OLL H La / Lic. No. 33028 11/12/2021 s�ONAL heet title: ROSION AND _EDIMENT CONTROL PLAN ;ale: 1 "=20' ate: 11 /12/2021 Teet # 3OF7 © 2021 - 30 LLC EROSION AND SEDIMENT CONTROL NARRATIVE PROJECT DESCRIPTION THE PURPOSE OF THIS PLAN IS TO CONSTRUCT A 32' X 48' MAINTENANCE SHED WITH 12' WRAP -AROUND SHED AND SURROUNDING GRAVEL ACCESS AREA. SINCE THE TOTAL DISTURBED AREA TO COMPLETE THIS WORK IS GREATER THAN 10 000-SF AND THE OWNER DESIRES TO BUILD AN OUTBUILDING ON THE PROPERTY, A VIRGINIA STORMWATER MANAGEMENT PROGRAM (VSMP) PERMIT IS REQUIRED. THERE IS AN EXISTING RESIDENCE AND GRAVEL DRIVEWAY ON THE 5-ACRE PROPERTY, CURRENTLY ZONED RA (RURAL AREAS). THE LAND COVER ON THE PROPERTY IS PRIMARILY MEADOW WITH SCATTERED TREE COVER. THE SITE SLOPES VIA SHEET FLOW TOWARD THE SOUTH. THERE ARE TWO SPRINGS AND A WPO BUFFER ALONG THE SOUTHERN EDGE OF THE SITE. NO DISTURBANCE OF THESE AREAS IS PROPOSED WITH THIS PLAN. ADJACENT AREAS THE SITE IS BORDERED ON THE NORTH AND EAST BY FOOTHILL FARM, WHICH IS UNDER THE SAME OWNERSHIP AS THE SUBJECT PROPERTY. RESIDENTIAL PROPERTIES ZONED RURAL AREAS BORDER THE SITE ON THE WEST AND SOUTH. SOIL DESCRIPTIONS BASED ON THE WEB SOILS SURVEY, THE FOLLOWING SOILS ARE ANTICIPATED TO BE ENCOUNTERED WITHIN THE LIMITS OF WORK. PREDOMINANT SOILS NAML RUNOFF CLASS FREQUENCY OF FLOODING FREQUENCY OFPONDING DEPTH TO WATERTABLE SOILS GROUP RABUN CLAY LOAM 7-15%(71C) MEDIUM NONE NONE >SW B RABUN CLAY LOAM I5-25% 710 MEDIUM NONE NONE �w B 'RABUN CLAY LOAM 7-15%(72C3) -SEVERELY ERODED MEDIUM NONE NONE DSO' B 4720 IS LOCATED ON THE NORTHERN FRINGE OF THE WORK AREA. CRITICAL AREAS GIS MAPPING INDICATES CRITICAL SLOPES AND A WATER PROTECTION ORDINANCE BUFFER ON THE PROPERTY. THE PROPOSED CONSTRUCTION DOES NOT PROPOSE DISTURBANCE OF ANY CRITICAL AREAS. EROSION AND SEDIMENT CONTROL MEASURES ALL EROSION AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED IN ACCORDANCE WITH THE MINIMUM STANDARDS AND SPECIFICATIONS IN THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK UNLESS OTHERWISE DIRECTED BY THE ALBEMARLE COUNTY INSPECTIONS DEPARTMENT. THE FOLLOWING EROSION AND SEDIMENT CONTROL PRACTICES (VESCH REFERENCE NUMBER INCLUDED) MAY BE IMPLEMENTED WITH THIS PLAN AND IS NOT AN EXHAUSTIVE LIST: VESCH REFERENCE# 3.01 - SAFETY FENCE (SAF) A PROTECTIVE BARRIER INSTALLED TO PREVENT ACCESS TO AN EROSION CONTROL MEASURE. 3.02 - TEMPORARY CONSTRUCTION ENTRANCE (CE) A CONSTRUCTION ENTRANCE SHALL BE PROVIDED AT THE ENTRANCE OF THE PROJECT SITE TO PROVIDE A MEANS OF REMOVING SEDIMENT FROM THE TIRES OF CONSTRUCTION VEHICLES LEAVING THE WORK SITE. THE CONTRACTOR SHALL REMOVE ANY MUD FROM THE EXISTING ROAD SURFACE BY MEANS OF SWEEPING AND SHOVELING IN THE EVENT THE WASH AREA IS NOT ADEQUATE IN SEDIMENT REMOVAL. PLEASE NOTE THAT SINCE THE DURATION OF THE PROJECT IS EXPECTED TO TAKE LESS THAN 60 DAYS, A TEMPORARY STONE CONSTRUCTION ENTRANCE IS PROPOSED IN LIEU OF A PAVED CONSTRUCTION ENTRANCE SINCE THE PERMANENT ACCESS WILL BE STONE. 3.03 - CONSTRUCTION ROAD STABILIZATION (CRS) THE TEMPORARY STABILIZATION OF ACCESS ROADS, SUBDIVISION ROADS, PARKING AREAS, AND OTHER ONSITE VEHICLE TRANSPORTATION ROUTES WITH STONE IMMEDIATELY AFTER GRADING. DUE TO THE LIMITED USE OF THE ACCESS PATHWAY, A STONE ACCESS IS NOT ANTICIPATED TO BE USED WITH THIS PLAN. 3.05 - SILT FENCE (SF) SILT FENCE IS TYPICALLY INSTALLED AS A FIRST STEP IN CONSTRUCTION ACTIVITIES. LOCATION AND DETAILS ARE SHOWN ON THE PLANS. 3.08 - CULVERT INLET PROTECTION (IP) A SEDIMENT FILTER AREA AROUND A CULVERT INLET TO MINIMIZE SEDIMENT FROM ENTERING THE STORM DRAINAGE SYSTEMS PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA. 3.09 - DIVERSION DIKE (DID) A RIDGE OF COMPACTED SOIL OR LOOSE ROCK OR GRAVEL CONSTRUCTED ACROSS DISTURBED RIGHT-OF-WAY AND SIMILAR SLOPING AREAS. LOCATION AND DETAILS OF THE RIGHT OF WAY DIVERSION ARE SHOWN ON THE PLANS. 3.13 - TEMPORARY SEDIMENT TRAP (ST) A TEMPORARY SEDIMENT TRAP IS TYPICALLY INSTALLED BEFORE SITE GRADING BEGINS, FOR THE PURPOSE OF DETAINING SEDIMENT -LADEN RUNOFF FROM DISTURBED AREAS. 3.31 -TEMPORARY SEEDING (TS) TO THE MAXIMUM EXTENT POSSIBLE, TEMPORARY SEEDING SHALL BE APPLIED TO DENUDED AREAS THAT REMAIN DORMANT FOR 7 DAYS. SEEDED AREAS SHALL BE LIMED WHEN NECESSARY AT A RATE OF 2 TONS/ACRE, AND FERTILIZED AT A RATE OF 600 LBS/ACRE OF 10-20-10 (14 LBS. PER 1,000 SQUARE FEET) OR EQUIVALENT. CONTRACTOR SHALL SELECT TEMPORARY SEEDING PLANT MATERIALS FROM TABLE 3.31-B OR C FROM THE VESCH. 3.32 - PERMANENT SEEDING (PS) A PERMANENT VEGETATIVE COVERING SHALL BE ESTABLISHED ON DISTURBED AREAS WITHIN 7 DAYS OF BEING BROUGHT TO FINAL GRADE AND THAT WILL NOT BE PAVED OR OTHERWISE BUILT UPON. CONTRACTOR TO SELECT THE PERMANENT SEEDING MIXTURE IN ACCORDANCE WITH THE SPECIFICATIONS IN THE VESCH. 3.35 - MULCHING (MU) ALL SEEDED AREAS SHALL BE MULCHED WITH STRAW IMMEDIATELY FOLLOWING SEEDING OPERATIONS. STRAW MULCH SHALL BE APPLIED AT A RATE OF 1.5 TO 2 TONS/ACRE. OTHER ALTERNATIVES MAY BE SELECTED FORM TABLE 3.35-A OF THE VESCH. 3.38 - TREE PROTECTION (TP) THE USE OF FENCING TO SERVE AS A VISUAL AND PHYSICAL BARRIER FOR THE EXISTING VEGETATION THAT IS TO REMAIN UNDISTURBED AS PART OF THIS PLAN. EROSION AND SEDIMENT CONTROL MEASURES - MAINTENANCE 1. THE CONSTRUCTION ACTIVITY OPERATOR OR HIS DESIGNEE, SHALL INSPECT ALL EROSION AND SEDIMENT CONTROL DEVICES IN ACCORDANCE WITH THE SCHEDULE PROVIDED IN THE GENERAL CONSTRUCTION PERMIT. IT IS RECOMMENDED THAT DEVICES BE CHECKED EACH DAY AND CERTAINLY AFTER EACH RAIN EVENT, AND THAT REPAIRS ARE MADE IMMEDIATELY AND AREAS ARE RE -SEEDED AND MULCHED AS APPROPRIATE. 2. ALL SEDIMENT -TRAPPING DEVICES AND FENCES SHALL BE CLEANED OUT AT 50 PERCENT CAPACITY OR HEIGHT, AND SEDIMENT SHALL BE DISPOSED OF BY PUMPING INTO A SILT -SACK OR OTHER APPROVED MEANS. 3. GRAVEL OUTLETS SHALL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP AND BE CLEANED WHEN SEDIMENT IS VISIBLY CLOGGING THE VOID SPACES. 4. DIVERSIONS SHALL BE CHECKED TO ENSURE PROPER RE-ROUTING OF DRAINAGE. DAMAGES THAT INTERRUPT THE EFFECTIVE FUNCTIONING OF THE DIVERSION SHALL BE REPAIRED IMMEDIATELY. 5. ALL SEEDED AREAS SHALL BE INSPECTED REGULARLY TO ENSURE THAT A VEGETATIVE COVER IS BEING ESTABLISHED. IN THE EVENT THAT THE SEEDING DOES NOT TAKE, CONTRACTOR TO TROUBLESHOOT AND TAKE REMEDIAL ACTION UNTIL THE APPROPRIATE VEGETATIVE COVER IS ESTABLISHED. GENERAL CONSTRUCTION NOTES FOR EROSION AND SEDIMENT CONTROL PLANS 1. THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION. 2. ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATION OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625-02-00 EROSION AND CONTROL SEDIMENT REGULATIONS. 3. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS THE FIRST STEP IN CLEARING. 4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE MAINTAINED ON THE SITE AT ALL TIMES. 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. 6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING AUTHORITY. 7. ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL FINAL STABILIZATION IS ACHIEVED. 8. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING DEVICE. 9. THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS FOR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY. 10. ALL FILL MATERIAL TO BE TAKEN FROM AN APPROVED, DESIGNATED BORROW AREA. 11. ALL WASTE MATERIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EARTH FILL SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND OTHER DEBRIS. 12. BORROW OR WASTE AREAS ARE TO BE RECLAIMED WITHIN 7 DAYS OF COMPLETION PER ZONING ORDINANCE SECTION 5.1.28. 13. ALL INERT MATERIALS SHALL BE TRANSPORTED IN COMPLIANCE WITH SECTION 13-301 OF THE CODE OF ALBEMARLE. 14. BORROW, FILL OR WASTE ACTIVITY INVOLVING INDUSTRIAL -TYPE POWER EQUIPMENT SHALL BE LIMITED TO THE HOURS OF 7:00 AM TO 9:00 PM. 15. BORROW, FILL OR WASTE ACTIVITY SHALL BE CONDUCTED IN A SAFE MANNER THAT MAINTAINS LATERAL SUPPORT OR ORDER TO MINIMIZE ANY HAZARD TO PERSONS, PHYSICAL DAMAGE TO ADJACENT LAND AND IMPROVEMENTS, AND DAMAGE TO ANY PUBLIC STREET BECAUSE OF SLIDES, SINKING, OR COLLAPSE. 16. THE DEVELOPER SHALL RESERVE THE RIGHT TO INSTALL, MAINTAIN, REMOVE OR CONVERT TO PERMANENT STORMWATER MANAGEMENT FACILITIES WHERE APPLICABLE ALL EROSION CONTROL MEASURES REQUIRED BY THIS PLAN REGARDLESS OF THE SALE OF ANY LOT, UNIT, BUILDING OR OTHER PORTION OF THE PROPERTY. CONSTRUCTION SEQUENCE ANTICIPATED START DATE: NOVEMBER 2021 ANTICIPATED COMPLETION DATE: FEBRUARY 2022 SEQUENCE OF CONSTRUCTION (ONE PHASE): 1. ESTABLISH TEMPORARY GRAVEL CONSTRUCTION ENTRANCE AND TREE PROTECTION FENCING AS SHOWN ON PLAN. 2. INSTALL PERIMETER SILT FENCE AND SEDIMENT TRAP AS SHOWN ON PLANS. ENSURE DIVERSION DIKE IS PLACED SO THAT ALL DISTURBED AREA WILL BE CONVEYED TO THE SEDIMENT TRAP. 3. PROVIDE TEMPORARY SEEDING ON DIVERSION DIKE AND DOWNSTREAM FACE OF SEDIMENT TRAP EMBANKMENT. 4. INSTALL 15" CULVERT AS SHOWN ON PLANS. PROVIDE CULVERT INLET PROTECTION AND GRADE IN DITCH TO DIRECT RUNOFF FROM CULVERT TO THE SEDIMENT TRAP. 5. PERFORM CUT/FILL OPERATIONS TO BRING SITE TO ROUGH PAD GRADE. BUILDING CONSTRUCTION MAY BEGIN. 6. GRADE IN DITCHES TO CONVEY RUNOFF TO CULVERT AND TO SEDIMENT TRAP. 7. PERMANENTLY STABILIZE ALL DISTURBED AREAS WITH PERMANENT SEEDING AND MULCH. 8. FINE GRADE SITE AND PROVIDE GRAVEL ACCESS AROUND BUILDING. 9. ONCE UPSTREAM AREA IS STABILIZED WITH PERMANENT VEGETATION OR IMPERVIOUS SURFACE, CONTRACTOR MAY REMOVE PERIMETER CONTROLS AND CONSTRUCT ENGINEERED LEVEL SPREADERS 1 AND 2. 10. REMOVE ALL EROSION AND SEDIMENT CONTROL DEVICES ONLY AFTER THE SITE IS STABILIZED AND PERMISSION IS GRANTED BY THE ALBEMARLE COUNTY EROSION AND SEDIMENT CONTROL INSPECTOR. EROSION AND SEDIMENT CONTROL PLAN MINIMUM STANDARDS (PER 9VAC25-840-40) 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 FOR LONGER THAN 14 DAYS, OR 7 DAYS IF REQUESTED BY THE LOCAL INSPECTOR. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR. 2. DURING CONSTRUCTION OF THE PROJECT, SOIL STOCK PILES AND BORROW AREAS SHALL BE STABILIZED OR PROTECTED WITH SEDIMENT TRAPPING MEASURES. THE APPLICANT IS RESPONSIBLE FOR THE TEMPORARY PROTECTION AND PERMANENT STABILIZATION OF ALL SOIL STOCKPILES ON SITE AS WELL AS BORROW AREAS AND SOIL INTENTIONALLY TRANSPORTED FROM THE PROJECT SITE. 3. A PERMANENT VEGETATIVE COVER SHALL BE ESTABLISHED ON DENUDED AREAS NOT OTHERWISE PERMANENTLY STABILIZED. PERMANENT VEGETATION SHALL NOT BE CONSIDERED ESTABLISHED UNTIL A GROUND COVER IS ACHIEVED THAT IS UNIFORM, MATURE ENOUGH TO SURVIVE AND WILL INHIBIT EROSION. 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. 5. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION. 6. SEDIMENT TRAPS AND SEDIMENT BASINS SHALL BE DESIGNED AND CONSTRUCTED BASED UPON THE TOTAL DRAINAGE AREA TO BE SERVED BY THE TRAP OR BASIN. A. THE MINIMUM STORAGE CAPACITY OF A SEDIMENT TRAP SHALL BE 134 CUBIC YARDS PER ACRE OF DRAINAGE AREA AND THE TRAP SHALL ONLY CONTROL DRAINAGE AREAS LESS THAN THREE ACRES. B. SURFACE RUNOFF FROM DISTURBED AREAS THAT IS COMPRISED OF FLOW FROM DRAINAGE AREAS GREATER THAN OR EQUAL TO THREE ACRES SHALL BE CONTROLLED BY A SEDIMENT BASIN. THE MINIMUM STORAGE CAPACITY OF A SEDIMENT BASIN SHALL BE 134 CUBIC YARDS PER ACRE OF DRAINAGE AREA. THE OUTFALL SYSTEM SHALL, AT A MINIMUM, MAINTAIN THE STRUCTURAL INTEGRITY OF THE BASIN DURING A 25-YEAR STORM OF 24-HOUR DURATION. RUNOFF COEFFICIENTS USED IN RUNOFF CALCULATIONS SHALL CORRESPOND TO A BARE EARTH CONDITION OR THOSE CONDITIONS EXPECTED TO EXIST WHILE THE SEDIMENT BASIN IS UTILIZED. 7. CUT AND FILL SLOPES SHALL BE DESIGNED AND CONSTRUCTED IN A MANNER THAT WILL MINIMIZE EROSION. SLOPES THAT ARE FOUND TO BE ERODING EXCESSIVELY WITHIN ONE YEAR OF PERMANENT STABILIZATION SHALL BE PROVIDED WITH ADDITIONAL SLOPE STABILIZING MEASURES UNTIL THE PROBLEM IS CORRECTED. 8. CONCENTRATED RUNOFF SHALL NOT FLOW DOWN CUT OR FILL SLOPES UNLESS CONTAINED WITHIN AN ADEQUATE TEMPORARY OR PERMANENT CHANNEL, FLUME OR SLOPE DRAIN STRUCTURE. 9. WHENEVER WATER SEEPS FROM A SLOPE FACE, ADEQUATE DRAINAGE OR OTHER PROTECTION SHALL BE PROVIDED. 10. ALL STORM SEWER INLETS THAT ARE MADE OPERABLE DURING CONSTRUCTION SHALL BE PROTECTED SO THAT SEDIMENT -LADEN WATER CANNOT ENTER THE CONVEYANCE SYSTEM WITHOUT FIRST BEING FILTERED OR OTHERWISE TREATED TO REMOVE SEDIMENT. 11. BEFORE NEWLY CONSTRUCTED STORMWATER CONVEYANCE CHANNELS OR PIPES ARE MADE OPERATIONAL, ADEQUATE OUTLET PROTECTION AND ANY REQUIRED TEMPORARY OR PERMANENT CHANNEL LINING SHALL BE INSTALLED IN BOTH THE CONVEYANCE CHANNEL AND RECEIVING CHANNEL. 12. WHEN WORK IN A LIVE WATERCOURSE IS PERFORMED, PRECAUTIONS SHALL BE TAKEN TO MINIMIZE ENCROACHMENT, CONTROL SEDIMENT TRANSPORT AND STABILIZE THE WORK AREA TO THE GREATEST EXTENT POSSIBLE DURING CONSTRUCTION. NONERODIBLE MATERIAL SHALL BE USED FOR THE CONSTRUCTION OF CAUSEWAYS AND COFFERDAMS. EARTHEN FILL MAY BE USED FOR THESE STRUCTURES IF ARMORED BY NONERODIBLE COVER MATERIALS. 13. WHEN A LIVE WATERCOURSE MUST BE CROSSED BY CONSTRUCTION VEHICLES MORE THAN TWICE IN ANY SIX-MONTH PERIOD, A TEMPORARY VEHICULAR STREAM CROSSING CONSTRUCTED OF NONERODIBLE MATERIAL SHALL BE PROVIDED. 14. ALL APPLICABLE FEDERAL, STATE AND LOCAL REQUIREMENTS PERTAINING TO WORKING IN OR CROSSING LIVE WATERCOURSES SHALL BE MET. 15. THE BED AND BANKS OF A WATERCOURSE SHALL BE STABILIZED IMMEDIATELY AFTER WORK IN THE WATERCOURSE IS COMPLETED. 16. UNDERGROUND UTILITY LINES SHALL BE INSTALLED IN ACCORDANCE WITH THE FOLLOWING STANDARDS IN ADDITION TO OTHER APPLICABLE CRITERIA: A. NO MORE THAN 500 LINEAR FEET OF TRENCH MAY BE OPENED AT ONE TIME. B. EXCAVATED MATERIAL SHALL BE PLACED ON THE UPHILL SIDE OF TRENCHES. C. EFFLUENT FROM DEWATERING OPERATIONS SHALL BE FILTERED OR PASSED THROUGH AN APPROVED SEDIMENT TRAPPING DEVICE, OR BOTH, AND DISCHARGED IN A MANNER THAT DOES NOT ADVERSELY AFFECT FLOWING STREAMS OR OFF -SITE PROPERTY. D. MATERIAL USED FOR BACKFILLING TRENCHES SHALL BE PROPERLY COMPACTED IN ORDER TO MINIMIZE EROSION AND PROMOTE STABILIZATION. E. RESTABILIZATION SHALL BE ACCOMPLISHED IN ACCORDANCE WITH THIS CHAPTER. F. APPLICABLE SAFETY REQUIREMENTS SHALL BE COMPLIED WITH. 17. WHERE CONSTRUCTION VEHICLE ACCESS ROUTES INTERSECT PAVED OR 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 PAVED OR PUBLIC ROAD SURFACE, THE ROAD SURFACE 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 DEVELOPMENT LOTS AS WELL AS TO LARGER LAND -DISTURBING ACTIVITIES. 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 VSMP AUTHORITY. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION. 19. PROPERTIES AND WATERWAYS DOWNSTREAM FROM DEVELOPMENT SITES SHALL BE PROTECTED FROM SEDIMENT DEPOSITION, EROSION AND DAMAGE DUE TO INCREASES IN VOLUME, VELOCITY AND PEAK FLOW RATE OF STORMWATER RUNOFF FOR THE STATED FREQUENCY STORM OF 24-HOUR DURATION IN ACCORDANCE WITH STANDARD (i), WHICH STATES, "INCREASED VOLUMES OF SHEET FLOWS THAT MAY CAUSE EROSION OR SEDIMENTATION ON ADJACENT PROPERTY SHALL BE DIVERTED TO A STABLE OUTLET, ADEQUATE CHANNEL, PIPE OR PIPE SYSTEM, OR TO A DETENTION FACILITY." TABLE 331-B ACCEPTABLE TEMPORARY SEEDING PLANT MATERIALS -QUICK REFERENCE FOR ALL REGIONS' Rate Planting Dates ie lbs. acre) Sept. 1 - Feb. 15 50/50 Mix of Annual Ryegrass (Lo6um mu1G-florum) & ;0 PO Cereal (Winter) Rye (Secale cereale) Feb. 16 - Apr. 30 Annual Ryegrass 00 - 100 (Lohum multi-florum) May 1 - Aug 31 German Millet (Setaria italics) 5U Source: Va. DSWC �7 TEMPORARY SEEDING SPECIFICATIONS J / VESCH STD. 3.31 TABLE 3.32-D SITE SPECIFIC SEEDING MIXTURES FOR PIEDMONT AREA Total Lbs. Per Acre Minimum Care Lawn - Commercial or Residential 175-200 lbs. - Kentucky 31 or Turf -Type Tall Fescue 95-100% - Improved Perennial Ryegrass 0.5% - Kentucky Bluegrass 0-5% High -Maintenance Lawn 200-250lbs. - 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. 150 Ibs. Low -Maintenance Slope (Steeper than 3:1) - Kentucky 31 Fescue 108 lbs. - Red Top Grass 2 lbs. - Seasonal Nurse Crop • 20 lbs. - Crownvetch •• 20 lbs. 150 lbs. • Use seasonal nurse crop in accordance with seeding dates as stated below: February 16th through April ...................... Annual Rye May 1st through August 15th ..................... Foxtail Millet August 16th through October ...................... Annual Rye h 1 .............. Winter Rye Novembertrough February Sth ..... y " Substitute Sericea lespedeza for Crownvetch east of Farmville, Va. (May through September use hulled Seneca, all other periods, use unhulled Seneca). If Flatpea is used in lieu of Crownvetch, increase rate to 30 lbs./acre. All legume seed must be properly inoculated. Weeping Lovegrass may be added to any slope or low -maintenance mix during warmer seeding periods; add 10-20 lbs./acre in mixes. �7 PERMANENT SEEDING SPECIFICATIONS PS) VESCH STD. 3.32 STORMWATER MANAGEMENT NARRATIVE EXISTING CONDITIONS CURRENTLY, RUNOFF FLOWS ACROSS THE PROJECT LIMITS BY MEANS OF SHEET FLOW FROM NORTH TO SOUTH. THE EXISTING LAND COVER IS WELL -ESTABLISHED MEADOW AREA WITH SLOPES THAT RANGE FROM 5% TO 15%. THERE ARE NO VISIBLE SIGNS OF EROSION WITHIN THE PROJECT AREA DOWN TO THE EXISTING PROPERTY LINE. FOLLOWING DEVELOPMENT, RUNOFF WILL CONTINUE TO FLOW VIA SHEET FLOW FROM THE PROJECT LIMITS ACROSS THE MEADOW TOWARD THE SOUTHERN PROPERTY LINE. THERE ARE THREE PROJECT OUTFALL AREAS IDENTIFIED ON THE PLANS. OUTFALLS #1 AND #2 INCLUDE ENGINEERED LEVEL SPREADERS TO ENSURE RUNOFF CONTINUES TO FLOW VIA SHEET FLOW AND OUTFALL #3 IS BY SHEET FLOW AT THE BOTTOM OF A FILL SLOPE THAT RUNS PARALLEL WITH THE LAND CONTOUR. NO ADVERSE EROSION EFFECTS ARE ANTICIPATED AS A RESULT OF THE SHEET FLOW FOLLOWING DEVELOPMENT SINCE THE EXISTING MEADOW IS IN VERY GOOD CONDITION WITH A WELL -ESTABLISHED PERMANENT VEGETATIVE GROUND COVER (GRASS), AND SOME TREES. ALSO, THE UNDERLYING RABUN SOILS (71C AND 7AD) ARE DEEP, WELL -DRAINED, PERMEABLE SOILS AND ARE NOT HIGHLY ERODIBLE. CHANNEL AND FLOOD PROTECTION CHANNEL AND FLOOD PROTECTION IS MET BY COMPLYING WITH 9VAC25-870-66(D) SINCE ALL RUNOFF FROM THE SITE IS SHEET FLOW AND NO POTENTIAL IMPACTS ON DOWN -GRADIENT PROPERTIES OR RESOURCES HAVE BEEN IDENTIFIED, AND THEREFORE NO FURTHER WATER QUANTITY CONTROLS ARE REQUIRED. WATER QUALITY TO MEET THE WATER QUALITY REQUIREMENTS FOR THE PROJECT, THE OWNER HAS PURCHASED 0.42 LBS/YR OF PHOSPHORUS CREDITS FROM AN ACCREDITED NUTRIENT CREDIT BANK. MAINTENANCE THE ENGINEERED LEVEL SPREADERS SHALL BE PRIVATELY OWNED AND MAINTAINED BY THE PROPERTY OWNER. REFER TO MAINTENANCE GUIDELINES ON SHEET 6 OF THE PLAN AND SEPARATE STORMWATER MANAGEMENT MAINTENANCE AGREEMENT. NUTRIENT CREDIT BILL OF SALE VIRGINIA NUTRIENT LAW P.O. Box 142 Penn Laird, VA 22846 - (.540) 908-1679 www. VireiniaNutricnmank.cam EXHIBIT A -BILL OF SALE Bill of Sale, made as of the ­I6'�$_day of April. 2021. by Virginia Nutrient Bank, LLC, a Virginia Limited Liability Company ("Seller'), to Tobias A. Dengel Trust & Lynn T. Dengel Trust ("Purchaser) Whereas, the Seller and Purchaser have entered into an Agreement for Purchase and Sale of Nutrient Offset Credits, dated as of April PO 2021 (the "Agreement"), the terms of which are incorporated herein by reference and made a pan hereof), with respect to the sale by Seller and purchase by Purchaser of Nutrient Credits held by the Seller's Upper James Nutrient Bank in Nelson County, Virginia within the James River watershed (HUC: 02080203). Now Therefore, for and in consideration of the payment of the purchase price (as defined in the agreement) and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Seller hereby sells, transfers, assigns, conveys, delivers, and sets over to Purchaser, its successors and assigns, 0.42 Nutrient Credits out of the Upper James Nutrient Bank as such are described in the Agreement. To Have and To Hold all such Nutrient Credits hereby sold and transferred to Purchaser and its successors and assigns forever for use in connection with Purchaser's project at Foothill Farm Drive Maintenance Building in Albemarle County. This project is located in HUC:02080204. In Witness Whereof, Seller has caused this Bill of Sale to be executed by its duly authorized representative as of the date first above written. Virginia Nutri n�nJJcc,t, LL��7 / By: " v Name: NadiadW. Blackwell Title: Manager Acquirer: Tobias A. Dengel Trust & Lynn T. Dengel Trust Project: Foothill Farm Drive Maintenance Building (HUC:02080204) TM/PQJ#: 62-73B Permittee: Tobias A. Dengel Tms(& Lynn T. Dengel Trust 1740 Foothill Farm Drive Charlottesville, VA 22911 VSMP#: <I acre Nutrient Bank: Upper James -James- 050(HUC:02080203) Phosphorus Offsets: OA2 pounds Nitrogen Offsets: 1.51 pounds 1992 3.05 CONSTRUCTION OF A SILT FENCE (WITHOUT WIRE SUPPORT) 1. SET THE STAKES. 2. EXCAVATE A eX 4" TRENCH UPSLOPE ALONG THE LINE OF STAKES. 6'MAx. I Jill FLOW - 3. STAPLE FILTER MATERIAL TO STAKES AND EXTEND IT INTO THE TRENCH. 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, Sherwood and Wyant Plate 3.05-2 SF) SILT FENCE DETAIL VESCH STD. 3.05 STONE CONSTRUCTION ENTRANCE it 11nn1t-, r I • III':'•Yi, ir4%N'iw'r'• Iti L VDOT 01 I I POSITIVE DRAINAGE COURSE AGGREGATE D TD SCDIMENT TRAPPING DEVICE MUST EXTEND FULL MOTH OF RATION AND EGRESS PLAN VIEW 12 WN, " "` SECTION A -A RE 10' MIN. Source: Adapted from 1983 Maryland Standards for Soil Plate 3.02-1 Erosion and Sediment Control, and Va. DSWC CE) CONSTRUCTION ENTRANCE VESCH STD. 3.02 WPO AMENDMENT - WATER QUALITY NOTE: REFER TO SHEET 5 FOR WATER QUALITY COMPLIANCE NARRATIVE AND CALCULATIONS FOR WPO AMENDMENT. REVISIONS # DESCRIPTION DATE EMSCALE ENGINEERING owner: TOBIAS A DENGEL TRUST 1740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 engineer: 30 SCALE, LLC 871 JUSTIN DRIVE PALMYRA, VA 22963 p: 434.242.2866 e: mike@30scale.com web: www.30scale.com Z J a CO NJ Z z 0 Q W � ti Z I N 5 C C I_I_I U. Z Q J J 0 0 N LL U � In Uj In 0 0 it w 0 U. C7 a < Z Z > iY sheet title: ESC-SWM NARRATIVE AND DETAILS Iscale: NONE I date: 11/12/2021 1 sheet # 4OF7 z e Z 0 U W J 2 W m I < © 2021 - 30 LLC WPO AMENDMENT - EXISTING SOIL FARM WATER QUALITY ACCESS PATH COMPLIANCE NARRATIVE AND CALCULATIONS 1 WITH THE WPO AMENDMENT, THE MAINTENANCE IMPROVED 1,034-SF (0.02 AC) STONE SECTION BUILDING HAS BEEN SHIFTED APPROXIMATELY 70 OF RELOCATED/SHORTENED FARM ACCESS 1 FEET NORTH AND 60 FEET EAST. AS A RESULT, PATH (1,034-SF IMPERVIOUS AREA IS EXEMPT THERE IS A 534-SF INCREASE IN IMPERVIOUS FROM WATER QUALITY REQUIREMENTS - AREA. THE OWNER IS PROPOSING AN REFER TO CALCULATIONS ON SHEET 4) AGRICULTURAL EXEMPTION FOR AN \ APPROXIMATE 0.02 AC. (1,034-SF) PORTION OF THE FUTURE PLANNED RELOCATED/SHORTENED FUTURE PHASE - FARM ACCESS ROAD THAT WILL BE SHARED WITH RELOCATED/SHORTENED i THE MAINTENANCE BUILDING STONE ACCESS. AS FARM ACCESS PATH BY \ A RESULT, THE NET IMPERVIOUS AREA WILL NOT OWNER BE INCREASED. APPROVED WPO PLAN - FOLLOWING DEVELOPMENT: MANAGED TURF AREA = 0.54 AC. \ ____-___-_- ---------- PR--P: IMPERVIOUS AREA = 0.22 AC. ________ ©' - ---- NUTRIENT CREDITS REQUIRED = 0.42 LBS/YEAR = ------------------- NOTE: OWNER PURCHASED 0.42-LBS CREDITS -� REFER TO SHEET 4 FOR PROOF OF PURCHASE4 \ WPO AMENDMENT - FOLLOWING DEVELOPMENT MANAGED TURF AREA = 0.44 AC. \ \ IMPERVIOUS AREA = 0.24 AC. \ \ LESS PORTION OF FARM ACCESS ROAD THAT IS \ SHARED = - 0.02 AC. \ I I NET IMPERVIOUS AREA = 0.22 AC. NUTRIENT CREDITS REQUIRED = 0.41 LBS/YR THEREFORE, WATER QUALITY REQUIREMENTS / ARE MET WITH THIS AMENDMENT BASED ON THE PREVIOUS PURCHASE OF NUTRIENT CREDITS. RELOCATED ELOlATED FARM ACCESS PLAN SCALE:1"=50' DITCH SCHEDULE LENGTH TOP DEPTH SLOPE SIDE Q10 V10 D10 FULL (FT) WIDTH (FT) (%) SLOPE (CFS) (FPS) (FT) CAP LINING (FT) (CFS) DITCH 1A 26 4.0 1.0 1.0 2:1 2.77 2.40 0.76 5.8 CL Al RIP -RAP DITCH 1B 130 4.0 1.0 11.0 2:1 2.36 5.60 0.46 19.2 CL Al RIP -RAP DITCH 1C 68 4.0 1.0 1.5 2:1 0.93 2.10 0.47 7.1 EC-2 DITCH 2 112 4.0 1.0 14.0 2:1 0.38 3.90 0.22 21.7 EC-1 4.0' DITCH CROSS-SECTION NOTES 1) ELS DETAILS ARE BASED ON DEQ SPECIFICATION NO. 2, FIGURE 2.4, MODIFIED AS SHOWN. 2) ENGINEERED LEVEL SPREADERS #1 AND #2 ARE TO BE PRIVATELY OWNED AND MAINTAINED. REFER TO MAINTENANCE GUIDELINES ON SHEET 6 OF THE PLANS. DITCH JA 10' MIN 0% UNDISTURBED EXISTING GRADE AT - 8% SLOPE IS CURRENTLY WELL -ESTABLISHED SHOWING NO SIGNS OF EROSION 3.75' 10, . 3' .. 3' VDOT CL Al RIP -RAPS (DEPTH VARIES) MIRAFI 140N FILTER FABRIC OR EQUIVALENT 3" 0% 555.0 PROVIDE DITCH LINING IN ACCORDANCE WITH DITCH SCHEDULE THIS SHEET - SEE SHEET 7 FOR DITCH CAPACITY AND VELOCITY CALCULATIONS TIMBERS #4 REBAR @ 6' O.C. BURIED 2 FEET BELOW EXCAVATED GRADE ENGINEERED LEVEL SPREADER (ELS) #1 SECTION ADAPTED FROM DEO SPECIFICATION NO. 2 NTS DITC)+1C � \ � �' '� � - LIMITS OF DISTURBANCE _ LINED WITH 0.68 AC. / VDOT STD�C-2 @ 1.59/_ \ �i 575 _ - TMP 62-71 _ \ SAS \77 - - - - - TOBIAS A DENCEL TRUST & - \ 4 76 LYNN T DENCEL TRUST /RELOCATED/SHORTENED I® 75 ZONE: RA STONE FARM ACCESS ® 74 - - - -} - PATH -SEE DETAIL 73 / - - - USE: RURAL AREAS 2 �; +- / DB 5107 PC 651 / THIS SHEET 720 720 - \\ -570- - 71 5 0 -75 / +10 71Q"71710 5 _DITCH 1B - \ fit+ 1� 130-LF CLASS Al RIP -RAP- DITCH (18" THICK)-@ 12% MAX. Ap + - PATH bp --- Pg E-L--- L- 0N-0 G: --E gTF 565- 32X48u1 p167 _ . `---------- 7 - _71_ 47.9 \ \-: -------------- 7?1 -� nw � / / 00, - T \�FG�9�\ = \ ®� 65 AROVNp SHEp <0 \\ ®® '- - rn12 W�P 59.8' 705 30 -560tv9Y \ G \ + ro tip 0 705 0 70P DITCH 570 GS \ a + ) 112-LF RIP -RAP DITCH - ` \ 6p Sum 4 \ VDOT STD. EC-1 STONE SEE SHEET FOR CULVERT - - COMP \ \ \ v 70 0 (12" THICK)-@ 14% MAX. 2 \ 2 6 - - IF 67 � - 44' -PROP 15" HDPE @ 1.13% � \ \ 2 _ 155� 630 \ \ \ \ \ \ \ \I +56 - 62 7 1 \ \ \ \ \ \ \\ S8 SEE -DETAIL- \ \ \ DITCH 1A I THIS SHEET ® - \ \ \ 26-LF CLASS Al RIP -RAP DITCH I q► \� 563 S) _ \ \ \ \\ \ \ \ (24 THICK) a� 1%MAX\ SEE DETAIL - ®-�� _ 560 - - = _ THIS SHEET 055-0 _ �S- _+ - OUTFACE#2 55 55 _ >� - - - - ENGINEERED LEVEL- - - - SPREADER (ELS) #2 56 0 - - 0 \ - _ _ Q 10=0.38 C F 56- - \ f - O - WIN LENGTH OF ELS#2 = 36.0' \ 13 x Q10 = 4.9' (13' MIN) _-PROVIDED I EUGTH-eF- / ® an - ELS-#2 - 13' - / // //= �_ ® ®_ Mir r"- \ (SEE DETAIL THIS SHEET) 1 I TM 62-73B / - > TbBIAS �• & LYNN T.- j / \ Y� / - - OUTFALL #1 DENCEL TRUST \ / / J i _ ENGINEERED LEVEL SPREADER (ELS) #1 Q10=2.77 CFS \ \ D'B. 5158-7 52, 5107 651\T D.B. �. / MIN LENGTH OF ELS#1 = 13 x Q10 = 36.0' D.B. 5040-669 / / l - ' \ —PROVIDED LENGTH OF�LS#1 = 36- - 1 D.B. 11088-693 & 694 PLAT - _ - - / / (SEE DETAIC T1#tS SHEETS 550 GRADING PLAN 0 20 40 60 SCALE: 1 "=20' C - 560 _ o - S) IITCH�> �c Sg 69 17 SY VDOT CL Al 14.1' RIP -RAP (24"-39" THICK) L 566 �� 563 56- - 56 21 SY VDOTTT At- - - o� w 560 RIP -RAP (24" THICK) 55 560 3:1 560 560 1+550 v -p 0 _ n 550+ 24 SY VDOT #3 STONE DEPTH VARIES 0"-36") 550+ 55 560 550 + \ 560 36.0' 555 36-LF 6X6 TREATED _ TIMBERS SECURED -KEY LEVEL _ WITH #4 REBAR- TOP OF SPREADER INTO -TIMBER TO BE FLAT AT EXISTING GRADE AN EMVATtON OF 556.0 ENGINEERED LEVEL SPREADER (ELS) #1 DETAIL 1"=5' 4' CH 2 Oa 1563.0 0% ►�UBl�xib�9C�]Qld UNDISTURBED EXISTING GRADE AT - 12% SLOPE IS CURRENTLY WELL -ESTABLISHED SHOWING NO SIGNS OF EROSION 2.5' 5' . 2' . 3' 3" Oy/o/o 561.7 4 SY VDOT EC RIP -RAP (27" THICK) - 4 SY VDOT EC-1 RIP -RAP (12" THICK) \' \Y%//\r6 TIMBERS \ \ \ #4 REBAR @ 6' O.C. MIRAFI 140N FILTER BURIED 2 FEET FABRIC OR BELOW EXCAVATED EQUIVALENT GRADE ENGINEERED LEVEL SPREADER (ELS) #2 SEC ADAPTED FROM DEQ SPECIFICATION NO. 2 NTS REVISIONS # DESCRIPTION DATE 7 SY VDOT # STONE (DEPTH VARIES 0"-24") DITCH 2 85 4 SY VDOT EC-1 630 RIP -RAP (12"-27" THICK) 7.2' 2, 630 630 62- j r 62� �617 61 2:1 1 T 7 62-- 61-+` 627 61� ro o 62- 627�� + W 62 7 o 13 � 13-LF 6X6 TREATED TIMBERS SECURED WITH #4 REBAR- TOP OF TIMBER TO BE FLAT AT AN ELEVATION OF 562.7 ENGINEERED LEVEL SPREADER (ELS) #2 DETAIL 1 "=5' KEY LEVEL SPREADER EXISTING GRADE EMSCALE ENGINEERING owner: TOBIAS A DENGEL TRUST 1740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 engineer: 30 SCALE, LLC 871 JUSTIN DRIVE PALMYRA, VA 22963 p: 434.242.2866 e: mike@30scale.com web: www.30scale.com z 0 Z Z) z O U J w J x 2 z w coa J Q NO z O Q LlJ r 1 w C c0 G Q � w U Q 0 LL Q J J O O L.L � w 0 O J W w O LL Q z z sheet title: GRADING-SWM PLAN scale: 111=20' date: 11 /12/2021 sheet # 5OF7 @ 2021 - 30 LLC 3 Z J a ul 0 Z a w LL 0 0 E 0 N W Z 3 0 ENGINEERED LEVEL SPREADER 1 AND 2 MAINTENANCE GUIDELINES Virginia Stormwater Management Handbook, Chapter 9 July 2013 9-C.3.0. SHEET FLOW TO VEGETATED FILTER AREAS AND CONSERVED OPEN SPACE: O&M CHECKLIST Inspection Date Project Site Plan/Permit Number Location Date BMP Placed in Service Date of Last Inspection Inspector Owner/Owner's Representative As -Built Plans available: Y I N Facility Type: Level Level Ideally, these BMP areas should be inspected annually, with the inspection conducted during the non - growing season when it is easier to observe the flow path. Once established, vegetated ritter strips have minimal maintenance needs outside of the Spring clean up: regular mowing, repair of check dams and other measures to maintain the hydraulic efficiency of the filter strip and a dense. healthy grass cover. Grass fitter strips and boundary zones must be mowed at least twice a year to prevent woody growth. A conservation easement may be required to ensure that the vegetated filter strip area and any newly established or restored forest cover may not be cleared. Also, a responsible party should ensure that routine forest improvements are made over time (i.e., thinning, invasive plant removal, etc.). _ _ >> Element of Potential r Who Will E m v How to Fix Problem Address Comments BMP Problem m m Problem m LL � K There is excessive Remove Immediately.afessional Owner or trash and debris Conbibuting There is evidence Drainage Area of erosino and/or Stabilize immediately Owner or exposed professional professionalw soil Inlets provide Stabilize immediately. as Owner or stable conveyance needed- professional into facility Excessive trash / Inlet debris I sediment Remove trash and debris °°r accumulation at the Immediately inlet Evidence of Comecl the source problem Owner or erosion al /around and stabilize immediately professional the inlet Scour and erosion Sediments are to be cleaned are present within out of Level Spreader Owner or the vegetated filler forebays and flow splicers professional area Debris antl Check conveyance(s) to the Channel sediment build-up filter far bcuble spots and Is present at the comet any problems Owner or top of the Immediately. Manually remove professional vegetate filler the deposited sediment. area Fool or vehicular Grael baffle is Block foot and vehicular Pro(essiona Diaphragm m p r� compromising the traffic. Re -stabilize the area gravel diaphragm. Immediately. The level spreader is performing Search the spreader for chips, property. Flows are cracks, or any other Professions not concentrating fundamental compromise of I Level Spreader on the down- the structure. Repair gradient side of the immediately. element There is excessive Owner or landscape waste Remove immediately. professional and and clippings Vegetative density is less than 90% Reseed and fertilize (if Owner or cover In the necessary) the exposed soil prof natitxW boundary zone or ass filler The plant Make a judgment regarding composition Is whether plants need to be Profession consistent with the replaced, and replace if I approved plans necessary Correctly destroy and/or remove the invasive species; Invasive species or make a judgment regarding Owner or Vagetation weeds are present whether other weeds need to professional be removed, and remove it necessary Use Integrated pest management (IPM) There is techniques to minimize the Owner or troublesome pest use of pesticides and professional infestation herbicides. Minimize use of organic (not chemical) fertilizer, as needed. There m dead Reseed or replace dead Owner or vegetation and/or vegetation on exposed soil professioo nal exposed soil areas Flows through the Check that the structure is not Oval Area filter area short- clogged. If so, manually clean Owner or circuit the overflow out debris immediately. professional control section The outlet provides Distillers stable conveyance Stabilize immediately, as Profession away from the filter needed. I area There is adequate access to the level Establish adequate access Professiona spreader and filter I area Overa There is evidence Fill in low spols and stabilize; Owner ar of standing water correct flow problems causing professional Writhing There is excessive Remove immediately Owner or leash and debris professional Eliminate stagnant pools and establish vegetation; treat for mosquitoes as needed. If Mosquito sprays are considered, then Owner pproliferationrofessio a Mosquito larvicide, such as o Pnal Bacillus thurendensis or Altoside formulations can be Overall applied only if absolutely (continued) necessary. Complaints from Cortecl real problems Cored Owner or local residents Encroachment on Inform involved property Owner the filter area or owners o1 BMPs status professional easement by Deady mark the boundaries I (and perhaps buildings/sbuctures of We receiving pervious the locality) area, as needed REVISIONS # DESCRIPTION DATE 0 30 60 90 N SCALE:1"=30' — t � AREA TO �— \ POST -DEVELOPMENT SEDIMENT TRAP TO CULVERT`, / _ A=1.57 AC. Tc=10 MIN—,— \ A=1.27 AC. C=0.35 110=5.311N/HR Q10=2.36CFS �� `' __-- �\ �y ------------- r _l/ If �\ 1 / - - E - --< A \ \ \ _ ...... __ \ \ _________ ------------------- t \ — POST -DEVELOPMENT \ \ — - _ OVERLAND TO OUTFALL #1 \\ \ 53° \ i t A=0.14 AC. — — C=0.51 \� 56 62 110=5.31 IN/HR Q10=0.38CFS r /�� 55 =— — —1-559 — 552 — TOTAL TO OUTFALL #1 / '�\� _ 552 — — — (ELS #1)//� \ 562 A=1.41 AC. — — —{-- —555 C=0.37 // /7 \ \ — OUTFALL #3 1 110=5.31 IN/HR , / ��� _ REDUCTION IN Q10=2.77 CFS 61, — SHEET FLOW — _ \ / OUTFALL #1 SHEET FLOW OVER / \ , / ENGINEERED LEVEL — / _ 545_ SPREADER (ELS) #1 PRE -DEVELOPMENT AREA TO / _ SHEET FLOW i-_—r — Tc=10 MIN A=1.70 AC. �. / Ir/ / j j /ice — — C=0.35 // �/ / — 110=5.31 IN/HR Z- Q10=3.16 CFS DRAINAGE DIVIDES SCALE: 1 "=50' 555 � 61 7 OUTFALL #2 — SHEET FLOW OVER ENGINEERED LEVEL SPREADER (ELS) #2 TOTAL TO OUTFALL #3 (SHEET FLOW) Tl MIN A=0.20 AC. C=0.54 110=6.64 IN/HR Q10=0.72 CFS Om SCA LE ENGINEERING fowner : TOBIAS A DENGEL TRUST 740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 engineer: 30 SCALE, LLC 871 JUSTIN DRIVE PALMYRA, VA 22963 p: 434.242.2866 e: mike@30scale.com web: www.30scale.com a I..L 0�/ LL_ O W E3 Cn Z Z O I L W Z J U) 0 Z W LLI '� J ar� O 0 LL / Lic. No. 33028 11/12/2021 : title: RAINAGE VIDES 1 "=30' 11 /12/2021 # 6OF7 F U_ F (n 0 J Q LU W co Q Z Z Z Q tY @2021 - 30 SCALE, LLC z a J a rn z A w 2 X < J x 0 O Li 0 0 N w a z rn 3 Channel Report Hydraflow Express Extension for Autodesk® Civil 3DO by Autodesk, Inc. DITCH 1A Triangular Side Slopes (z:1) = 2.00, 2.00 Total Depth (ft) = 1.00 Invert Elev (ft) = 100.00 Slope (%) = 1.00 N-Value = 0.030 Calculations Compute by: Known Q Known Q (cfs) = 2.77 Elev (ft) 102.00 101,50 101.00 100.50 100.00 IItltltlE5:5x�� v v v v v w w DITCH CALCULATIONS Thursday, Nov 112021 Highlighted Depth (ft) = 0.76 Q (Cfs) = 2.770 USE VDOT Area (sqft) = 1.16 STD CLASS Velocit ft/s = 2.40 Al RIP -RAP Wetted Perim (ft) = 3.40 Crit Depth, Yc (ft) = 0.66 Top Width (ft) = 3.04 EGL (ft) = 0.85 Depth (ft) 2.00 1.50 1.00 0.50 0.00 -0.50 0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5 Reach (ft) Channel Report Hydraflow Express Extension for Autodesk® Civil 3DO by Autodesk, Inc. DITCH 1C Triangular Side Slopes (z:1) = 2.00, 2.00 Total Depth (ft) = 1.00 Invert Elev (ft) = 100.00 Slope (%) = 1.50 N-Value = 0.030 Calculations Compute by: Known Q Known Q (cfs) = 0.93 Elev (ft) 102.00 101.50 101.00 100.50 100.00 99.50 Section Friday, Nov 12 2021 Highlighted Depth (ft) = 0.47 Q (cfs) = 0.930 USE EC-2 EROSION Area (sgft) = 0.44 CONTROL MATTING Velocit Ws = 2.11 Ir Wetted Perim (ft) = 2.10 Crit Depth, Yc (ft) = 0.43 Top Width (ft) = 1.88 EGL (ft) = 0.54 .5 1 1.5 2 2.5 3 3.5 4 4.5 Reach (ft) Depth (ft) 2.00 1.50 1.00 0.50 0.00 -0.50 Channel Report Hydraflow Express Extension for Autodesk® Civil 306 by Autodesk, Inc. DITCH 113 Triangular Side Slopes (z:1) = 2.00, 2.00 Total Depth (ft) = 1.00 Invert Elev (ft) = 100.00 Slope (%) = 11.00 N-Value = 0.030 Calculations Compute by: Known Q Known Q (cfs) = 2.36 Elev 102.00 101.50 101.00 100.50 100.00 99.50 (ft) Section Thursday, Nov 11 2021 Highlighted Depth (ft) = 0.46 Q (Cfs) = 2.360 USE VDOT Area (sgft) = 0.42 STD CLASS Velocit ft/s = 5.58 Al RIP -RAP Wetted Perim (ft) = 2.06 Crit Depth, Yc (ft) = 0.62 Top Width (ft) = 1.84 EGL (ft) = 0.94 Depth (ft) 2.00 1.50 1.00 0.50 0.00 -0.50 0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5 Reach (ft) Channel Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. DITCH 2 Triangular Side Slopes (z:1) = 2.00, 2.00 Total Depth (ft) = 1.00 Invert Elev (ft) = 100.00 Slope (%) = 14.00 N-Value = 0.030 Calculations Compute by: Known Q Known Q (cfs) = 0.38 Elev (ft) 102.00 101.50 101.00 100.50 100.00 99.50 Section Thursday, Nov 112021 Highlighted Depth (ft) = 0.22 Q (cfs) = 0.380 USE VDOT Area (sgft) = 0.10 STD. EC-1 Velocit ft/s = 3.93 STONE Wetted Perim (ft) = 0.98 Crit Depth, Yc (ft) = 0.30 Top Width (ft) = 0.88 EGL (ft) = 0.46 .5 1 1.5 2 2.5 3 3.5 4 4.5 Reach (ft) Depth (ft) 2.00 1.50 1.00 0.50 0.00 -0.50 CULVERT CALCULATIONS Culvert Report Hydraflow Express Extension for Autodesk® Civil 3DO by Autodesk: Inc. Tuesday, Nov 9 2021 15 INCH CULVERT Invert Elev Dn (ft) = 56.50 Calculations Pipe Length (ft) = 44.00 Qmin (cfs) = 2.38 Slope (%) = 1.14 Qmax (cfs) = 2.38 Invert Elev Up (ft) = 57.00 Tailwater Elev (ft) = (dc+D)/2 Rise (in) = 15.0 Shape = Circular Highlighted Span (in) = 15.0 Qtotal (cfs) = 2.38 No. Barrels = 1 Qpipe (cfs) = 2.38 n-Value = 0.012 Qovertop (cfs) = 0.00 Culvert Type = Circular Culvert Veloc Dn (Ws) = 2.42 Culvert Entrance = Smooth tapered inlet throat Veloc Up (Ws) = 3.95 Coeff. K,M,c,Y,k = 0.534, 0.555, 0.0196, 0.9, 0.2 HGL Dn (ft) = 57.43 HGL Up (ft) = 57.62 Embankment Hw Elev (ft) = 57.91 Top Elevation (ft) = 59.30 Hw/D (ft) = 0.72 Top Width (ft) = 20.00 Flow Regime = Inlet Control Crest Width (ft) = 30.00 owe ,sao,tuvEar •��+. ma 1N NOAA ATLAS 14 DATA NOAA ATLAS 14 POINT PRECIPITATION FREQUENCY ESTIMATES: VA lam rW erlpbn Data 1YPa: PrmcolNson Mn9ky . Illllra: Ergs,h v Tllm aaNea type: Panml dwasm .. AAt1 bcatipn I) Ma,wrall3c al ay lounen lOeca,Nl dapew lMa'-'rorBeIW WI' Laaa0e OL0nyWdeO BuMNI bl 6y MAfion (list OVA sWWris): 6eprt 4LYM v 0ey.4d,.,,[ 1lh­,..,X Q 9 Uss Hue {d ESRI mlva v,n,nee n not aadmq, [ry edtlln9 me Hoer hdpa:;>Ja.ucen.caM u me Newa,. a, rm4.ct ds a e,4z wewwwg�rwaglw.t. Map v 91!14lR location ■ Tanen M...,part rw dcuala Ur. b) click,M, altl,a„ k. snow zlam,w r., m.p Lacatl ninrormNion: Nama: Chwlonea'Ale N,yna, udtwr:. 36.0812` Longlaudsu 794251' I tom,• a++' • 9au,xa ESRlmp USGS POINT PRECIPITATION FREQUENCY (PF) ESTIMATES WTrtl ll 1 CONFIDENCE WnRVAL9 AND SUPWENENTWf INFORMATION NUAA AIW td. WI.. 2, Vanion ] PF tabular �ttpplementaryinformation A Prelowe PDS•bbsed precipitation finstKnocy estimates with 90% conridetnca intervals in inchnlAwur 1 OMaAW1 acre ,r}ln6^CB INbrval rel 2 5 10 25 50 toe 2m W Iwo 64nn 424 564 5.00 614 7.40 6.14 635 4.32 10.0 1e.6 36i 4691 4555.591 5.32 N.5]1 69A 1141 'a 10 a26, ik l2 ltq 9, 191t TI 10-Ilwl AW 4.72 631 6,66 6.N 6.95 735 T.63 C33 3953151 3W 4A11 N25i231 (4 T85.Or, 15336", (5AT.141 i6.16166, i6508141 16.09 BT51 ?9-9.231 13.rtn 2.t2 316 9.e6 A43 AF 541 1 6.66 4.22 11'" 6.n 3063.U1 1391A1 4024% '4515%11 4tl76021 :5196a51 ih 4T 5551 13 TY 1- aa2723I '' /9l A33 2e3 3.24 313 4.13 4Aa 4.N s.=9 "a '19 to 21a1 2102.591 (2.953.U1 292d.59 (3.344.121 (3674.64Ij i3.914NI i4.265.33, i4.60514 (4576.231 REVISIONS # DESCRIPTION DATE im SCALE ENGINEERING fowner: TOBIAS A DENGEL TRUST 740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 engineer: 30 SCALE, LLC I871 JUSTIN DRIVE PALMYRA, VA 22963 p: 434.242.2866 e: mike@30scale.com web: www.30scale.com Z J a U) 0 0 Z Z O Q W �A 1 _ Z I N Q r�Uj vJ Q z I O = O I- U h LJJ C/) 0 O J a_ ow H U. a v� .� M LF. S y Lic. No. 33028 11/12/2021 O� etc, �ssIONAL ECG` !t title: ITCH AND ULVERT ALCULATIONS NONE 11 /12/2021 t # 7OF7