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HomeMy WebLinkAboutWPO202100006 Approval - County 2022-12-15@2021 - 30 SCALE, LLC WPO AMENDMENT - EXISTING SOIL FARM WATER QUALITY ACCESS PATH COMPLIANCE NARRATIVE AND IMPROVED 1,034-SF (0.02 AC) STONE SECTION CALCULATIONS OF RELOCATED/SHORTENED FARM ACCESS PATH (1,034-SF IMPERVIOUS AREA IS EXEMPT FROM WATER QUALITY REQUIREMENTS - WITH THE WPO AMENDMENT, THE MAINTENANCE REFER TO CALCULATIONS ON SHEET 4) BUILDING HAS BEEN SHIFTED APPROXIMATELY 70 FEET NORTH AND 60 FEET EAST. AS A RESULT, 1 ', THERE IS A 534-SF INCREASE IN IMPERVIOUS AREA. THE OWNER IS PROPOSING AN FUTURE PHASE -SEE CROSSING DETAIL BELOW 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 FUTURE PHASE - THE MAINTENANCE BUILDING STONE ACCESS. AS 'i t A RESULT, THE NET IMPERVIOUS AREA WILL NOT RELOCATED/SHORTENED BEINCREASED. FARM ACCESS PATH BY OWNER ' APPROVED WPO PLAN - FOLLOWING DEVELOPMENT: MANAGED TURF AREA = 0.54 AC. \ ---- _______----------- PR--p; IMPERVIOUS AREA = 0.22 AC. ------- ________ ©' ---Btin 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 FARM ACCESS PLAN SCALE:1"=50' \ 705 + \ UTURE 30-1 15" HOPE OR EQUIV. CULVERT @ 0.67% \ 67$ 0 ITCHES TO TIE IN SMOOTHY TO ENDS OF CULVERT P FUTURE ROAD - - CROSSING FUTURE DITCH CROSSING DETAIL (NOT FOR CONSTRUCTION) 1 "=10, M PROVIDE DITCH LINING IN ACCORDANCE WITH DITCH SCHEDULE THIS SHEET - SEE SHEET 7 FOR DITCH CAPACITY AND VELOCITY CALCULATIONS DITCH CROSS-SECTION NTS DITCH SCHEDULE TOP DEPTH SLOPE SIDE Q10 V10 D10 AP L (FT) WIDTH (FT) (%) SLOPE (CFS) (FPS) (FT) C 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 1 B 130 4.0 1.0 11.0 2:1 2.36 5.60 0.46 19.2 CL Al RIP -RAP DITCH 1C 1 68 1 4.0 1 1.0 1 1.5 1 2:1 1 0.93 1 2.10 7 7.1 EC-2 DITCH 2 112 4.0 1.0 14.0 2:1 0.38 3.90+0A 0.22 21.7 EC-2 CLEAN, WASHED _ I ( \ t� LIMITS OF DISTURBANCE _ DITC1C \ _ - - - - , _ �-410-LEVDLCH LINED WITH \ � 0.68 AC. VDOT STD\,�C-2 @ 1.59/\ - 575 �--- TMP 62 - 71 TOBIAS A DENCEL TRUST & - 4 76 LYNN T DENGEL TRUST' RELOCATED/SHORTENED 1® 75 _ ZONE: RA � STONE FARM ACCESS 74 - - - - - - -� USE: RURAL AREAS PATH -SEE DETAIL 2 73- \ DB 5107 PG 651 - /. \ THIS SHEET 72p 570 - _ 715 i \ - - ` 575 i 710 '71 Q;7 p 1 i 71, '1 DITCH 1B \ +- - - i / 84-LF CLASS Al RIP -RAP DITCH- \ / \ \ - - - (18" THICK@ 12% MAX. + � ---- ---- + ---- �� -565- MTFLNGE - ------- _ 1 � 32X48gU1LDWG -� --- / - - 1 i'. i \ - PATH a? i y --------- 7.9' 2;�7 \ EO + 1 yl ��c�9�\ = \ �� ® \ 65 P AROUND SH /F� \ ■ ® - 0� 12V�RP 59.8' 705 1 i oe .\: \ 0 30R o i -560� \ �9Y 66 \ 5+ ro ry \ 70- 0 70 ! DITCH 2 _ \ 57P+ \ sS \ a + 112-LF V-DITCH LINED SEE SHEET FOR CUL EV RTC \ 160 �� 4 \ i\ WITH VDOT STD. EC-2 COMPUTATIONS \ \ v 70 0 11` - @ 14% MAX. \ �\ �\25F\ 93 2SR + 69 1 0 \ s _ 44' -PROP 15" HOPE @ 1.13% \ �h58 7 \ IF \ 2 IF 67 8 % 565 = 66 5 - - 65� 62Z 622 - S \ \ 6- 6/ - - - `f c' \ \ + - _ N 7 56- � � 62Z - \ \ - _ \ DITCH 1A \\ \ - THIS SHEET ®®� 30 \ \ 26 ILS V-DITCH\LINED WITH / I� \ 563 -4 - VDOT S. EC-2 1.0% MAX\ J J I \ - _ SEE DETAIL \ \ - - ®-�� - 560 - - - - _ _ THIS SHEET \ // \ + -� OUTFALL #2 SSO \ \( - c\I� 55 555 --'5 ENGINEERED LEVEL- - - \ / \ - s6- 0 \� SPREADER (ELS) #2 - \ x Q10=0.38 C � - - - 56 56 56 O \ - - - WIN LENGTH OF ELS#2 = nI 36.0' �13 x Q10 = 4.9' MIN) D I 1 Y 1 - 555 - PROVIDEFNL'G TH-AF � _ ELS-#2---13'- I / \ JI- (SEE DETAIL THIS SHEET) // \ TM 62-73B / /� / \ - - TOIAS 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. 50 & 69 T l \-{1ROVLDED LENGTH OFELS#t= 36'- 1D.B. 1088-693 & 694 PLAT l - � (SEE DETAIL THIS Stii - GRADING PLAN -55D NOTES 1) ELS DETAILS ARE BASED ON DEQ SPECIFICATION NO. 2, FIGURE 2.3b. 0 20 40 60 2) ENGINEERED LEVEL SPREADERS #1 AND #2 ARE TO BE PRIVATELY OWNED AND MAINTAINED. REFER TO SCALE: 1"=20' MAINTENANCE GUIDELINES ON SHEET 6 OF THE PLANS. GRAVEL VARIABLE (MIN. 7 FT) FILTER FABRIC 6'X6 TR64TED TIMBERS OR CONCRETE UP / #4 REBAR TO SECURE t - � /TIMBERS 1- BIN. MIN Ll II- - -ll i i 3 FT - - I- - SEE PLAN FOR MIN 6 FT. SLOPE Figure 2.36: Section - Level Spreader wNh Rigid Lip ENGINEERED LEVEL SPREADER (ELS) TYPICAL CROSS SECTION A -A' AND B-B' REF: Di SPECIFICATION NO. 2 (FIGURE 2.3b) DITCH 1A Sg 159 \ 14.1' 1 A 56� 561 - 56 53 SY GRASS (PROVIDE \65 SEED OR SOD TO ESTABLISH PERMANENT VEGETATIVE COVER) 50 s 560 555 ��// ---------r-�� rn � N O 565 565 �/ / \ FF5 565 w 0 36.0' A 555- 36-LF 6X6 TREATED - TIMBERS SECURED i KEY LEVEL CLEAN, WASHED GRAVEL - - WITH #4 REBAR- TOP OF SPREADER INTO WITH FILTER FABRIC 1MBER TO BE FLAT AT EXISTING GRADE UNDERLAYMENT AN E�CEVATLON OF 556.0 ENGINEERED LEVEL SPREADER (ELS) #1 DETAIL 1 "=5' - KEY LEVEL - SPREADER INTO EXISTING GRADE I 13 SY GRASS (PROVIDE-' SEED OR SOD TO ESTABLISH PERMANENT VEGETATIVE COVER) 562 CLEAN, WASHED GRAVEL WITH FILTER FABRIC UNDERLAYMENT DITCH 2 \ 65 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' 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 r z Q • V J J 0 zQ w I_ Z C) 0 /r \� z U w w :2 z 5 N (_0 CC G L PIP 0 0 � � op q LU C / O J / 0 z r 0 J r 0 w O Ir 0 V H sheet title: GRADING-SWM PLAN APPROVED by the Albemarle County Community Development Department Date 12/15/2022 File WP02021-00006 Amendment #2 scale: 1 "=20' date: 12/16/2022 sheet # 5OF7