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HomeMy WebLinkAboutWPO202100006 Plan - VSMP 2022-10-24@2021 - 30 SCALE, LLC WPO AMENDMENT WATER QUALITY COMPLIANCE NARRATIVE AND CALCULATIONS WITH THE WPO AMENDMENT, 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. 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. APPROVED WPO PLAN - FOLLOWING DEVELOPMENT: MANAGED TURF AREA = 0.54 AC. 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 PURCHASE 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. 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. EXISTING SOIL FARM ACCESS PATH IMPROVED 1,034-SF (0.02 AC) STONE SECTION OF RELOCATED/SHORTENED FARM ACCESS PATH (1,034-SF IMPERVIOUS AREA IS EXEMPT FROM WATER QUALITY REQUIREMENTS - REFER TO CALCULATIONS ON SHEET 4) FUTURE PHASE - RELOCATED/SHORTENED FARM FARM ACCESS PATH BY OWNER \----------- PRpp. ©A I �\ 13 \ \ \ I I / I RELOCATED 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 EC-2 DITCH 1B 130 4.0 1.0 11.0 2:1 2.36 5.60 0.46 19.2 CLA1 RIP -RAP DITCH 1C 68 4.0 1 1.0 1 1.5 1 2:1 1 0.93 1 2.10 1 0.47 1 7.1 1 EC-2 DITCH 2 112 4.0 1 1.0 1 14.0 1 2:1 1 0.38 1 3.90 1 0.22 1 21.7 1 EC-2 4.0' I1]1ry:Its] 00119=5•9ZENI[07Ilk 1 CLEAN, WASHED GRAVEL FILTER FABRIC PROVIDE DITCH LINING IN ACCORDANCE WITH DITCH SCHEDULE THIS SHEET - SEE SHEET 7 FOR DITCH CAPACITY AND VELOCITY CALCULATIONS VARIABLE (MIN. 7 FT) 6'X6' TREATED TIMBERS OR CONCRETE UP #4 REBAR TO SECURE 6 IN. MIN TIMBERS r II, li -i' i! 1 3FT r MIN 6FT - Figure 2.3b: Section - Level Spreader with Rigid Lip ENGINEERED LEVEL SPREADER (ELS) TYPICAL CROSS SECTION A -A' AND B-B' REF: DEQ SPECIFICATION NO. 2 (FIGURE 2.3b) REVISIONS # DESCRIPTION DATE 1 REVISE ELS 1 AND 2 10-24-2022 -410-LEVDLCH LINED WITH / VDOT STD,.\�C-2 @ 1.5 - - Z_4m TMP 62-71 \ SE A DENCEL TRUST & - mia 76��� LYNN T DENCEL TRUST ' RELOCATED/SHORTENED 11® 75 _ ZONE: RA STONE FARM ACCESS 74 - - - - - - -� USE: RURAL AREAS -PATH -SEE DETAIL 2 73 + - _ DB 5107 PG 651 - / \ THIS SHEET 720 7 0 \ \ 570 - / 71 5 i ti o �}� - +10 714 DITCH 1B \ \ + 1 �- / 84-LF CLASS Al RIP -RAP DITCH- � \ (18" Ti 12/o + =' - o - ------------ �� _ _ M�IdTELNGE -565- \ --------- 32'X48 gU1LD\NG \M62\ ` \ PATH - - _ - Pg - S a? + 71� 4 - 7.9' 4to,00 65 ARO59.5 UNp SHED - 560 \ \ + 60 705 18 570 sS \ + 4 o SEE SHEET FOR CULVERT\ \ \ \ ®� \6p� sum \ a COMPUTATIONS \ \ \ v 70 P LIMITS OF DISTURBANCE _ 0.68 AC. 70 5 - T � 70 DITCH 2 112-LF V-DITCH LINED \ WITH VDOT STD. EC-2 - @ 14% MAX. SI 69 0 68 _ 565 i 44' - PROP 15" HDPE @ 1.13% 58 \ \ 62 IF 67 _ 66 61 _ 65� 62� _ .; 622 it \ \ \ \\ \\I N 56- s662- 9 - - 627 \ \ \\ _ _ _ 8 SEE -DETAIL DITCH 1A I p - THIS SHEET ®® - 26-LF V-DITCH LINED WITH I �► �0 563 VDOT S�. EC-2 1.0% 1J I \ o - _ SEE DETAIL 00 - _ ®-�� - 560 - - _ THIS SHEET \ \ 0 \ / 5 ® -� OUTFALL #2 SSQ\ / 1 ® _ 6555 55- #C - ENGINEERED LEVEL- - - - \ SPREADER (ELS) #2 56- // _ _ Q10=0.38 C i - - � 56 � 56 � 56 � O \ -1v11N LENGT I�OF ELS#2 = \ / / 36.0' 11*05 13 x Q10 = 4.9'(13'MIN) _-PROVIDED I FNL'TH-AF- / ELS-#2---13'- (SEE DETAIL THIS SHEET) TM 62-73B / / TbBIAS DENGEL TRUST & LYNN T. / _ TFALL #1 DENCEL TRUST / \ - _ ENGINEERED LEVEL SPREADER (ELS) #1 \ \ D.B. 5158-751-A & 752,PLAT D.B. // \ _� - - - _ _ _ 5107-651 / ! - Q10=2.77 CFS MIN LENGTH OF ELS#1 = 13 x Q10 = 36.0' D.B. 5040-669 l \-{1ROVLDED LENGTH OFELS#t= 36- 1 D.B. 11088-693 & 694 PLAT - I I / (SEEDETAICTH1SSl3€ET� - / 550 NOTES GRADING PLAN 1) ELS DETAILS ARE BASED ON DEQ SPECIFICATION NO. 2, FIGURE 2.3b. 2) ENGINEERED LEVEL SPREADERS #1 AND #2 ARE TO BE PRIVATELY OWNED AND MAINTAINED. REFER TO MAINTENANCE GUIDELINES ON SHEET 6 OF THE PLANS. - 560 _ DITCH 1A /\\ \ S8 69 56� 56- _ I � 56 53 SY GRASS (PROVIDE SEED OR SOD TO 56p ESTABLISH PERMANENT VEGETATIVE COVER) P SEE PLAN FOR o - 560 SLOPE s� 56 \ \ 55' 55r' 55r' \ r--------------------------\-- W C2 36.0' _ A • 555 \-36-LF 6X6 TREATED TIMBERS SECURED Ai KEY LEVEL CLEAN, WASHED GRAVEL - - WITH #4 REBAR- TOP OF SPREADER INTO WITH FILTER FABRIC TIMBER TO BE FLAT AT EXISTING GRADE UNDERLAYMENT ANVATyON OF 556.0 ENGINEERED LEVEL SPREADER (ELS) #1 DETAIL 1"=5' 13 SY GRASS (PROVIDE SEED OR SOD TO ESTABLISH PERMANENT VEGETATIVE COVER) CLEAN, WASHED GRA WITH FILTER FAB UNDERLAYM 0 20 40 60 SCALE: 1 "=20' \ 62Z DITCH 2 \65�� - 63= 62 2 622 \�i '7 r sss ...; WCz 13 0' 562 - - I B 1 VEL 11 RIC ENT ENGINEERED LEVEL SPREADER (ELS) #2 DETAIL 1 "=5' 13-LF 6X6 TREATED TIMBERS SECURED WITH #4 REBAR- TOP 01= TIMBER TO BE FLAT AT AN ELEVATION OF 562.7 KEY LEVEL SPREADERINTO EXISTING GRADE EMSCALE ENGINEERING owner: TOBIAS A DENGEL TRUST 1740 FOOTHILL FARM DRIVE CHARLOTTESVILLE, VA 22911 engineer: 30 SCALE, Li 871 JUSTIN DRIVE PALMYRA, VA 22963 p: 434.242.2866 e: mike@30scale.com web: www.30scale.com a N0 0 UJI UJI 0 0 W Z nJ C) z W L LL J J Z 0 0 H L Lic. No. 33028 0 10/24/2022 Q0 G > z O U w J x 2 w coJ U U) 0 J w W (D z z > sheet title: GRADING-SWM PLAN scale: 1 "=20' date: 11 /12/2021 5OF7