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Home My WebLink AboutSW1210602_Plansheet - SCM Detail_20210630DocuSign Envelope ID: 61796BC1 -4762-4278-AF1 1-747CBB7384D7 0 r-i N N 0 Ln N as 3 0 0 N 0 M U U c U 'o L Q w fA D LL I� PROPOSED FOREBAY #1 PROPOSED EMERGENCY SPILLWAY PROPOSED CI #17 ROPOSED 212C ROPOSED PROPOSED CI #16 PROPOSED CI #15 FOREBAY #2 \ FOREBAY #3 ROPOSED 2120 CI #14 PROPOSED FOREBAY #4 - 2110 \ 4 2100 N -� --- --- T-� 18 LF -� T-� 3-- -- ---- -- =,,... 119 LF Y � - - _ 10 LF � _10-LF 128 LF 99 LF-� 65 LF _ I -� - -� - - _ _ _ �- } _ - - - - 156 LF ♦ ♦ ., \ - 144 LF _� - - 10 LF 171 LF T 123 LF 10 LFI � 4 322 LF 43---�---- �� - - �, _ -y- - _ �_ _�,_ ♦♦ 96 LF y 10 LF! 313 LF' �___-----�-• �/ • -� - 66 LF 10, LF 304 LF 4 - - _� �� 36 LF 10 LF 25 LF _�_ _� >\ >\296 LF---------�-� / o DO 10 LF _�_ - 261 LF _ 3 x PROPERTY__ �___�_------ BOUNDARY 3 LF � 252 LF - -�- -�- > > 10' BERM--------------3- ----�� PROPOSED 4" PVC/SCH 40 +2100' 2100 _ CLEANOUT (TYP.) (19 TOTAL) PROPOSED OTCB #9 (TO BE CONVERTED TO OCS) / ♦ ♦PROPOSED 4" SLOTTED PVC/SCH 40 PROPOSED/( JB #6 + + + 4444 UNDERDRAIN (TYP.) (2,769 LF TOTAL) �44 PROPOSED 9" d50 STONE RIP RAP EXTENDED TO - ELEV. 2098' PROPOSED CI #13. XISTING WETLAND •, (TYP.) (PER CEC) PROPOSED STORM DRAIN ROPOSED RETAINING DISCHARGE LINE JB PROPOSED ♦ WALL (TYP.) PROPOSED OUTLET #1 PROPOSED LEVEL SPREADER #1 CAPPED CLEAN OUT PIPE TOP ELEV. = "B" 12" HIGH RIP -RAP ENERGY & VELOCITY (SEE BIO-CELL PLAN FOR LOCATIONS) DISSIPATER WITH FILTER STONE WATER QUALITY TOP ELEV. = "B" PONDING ELEV. = "B" FILTER BLANKET TOP OF MULCH CELL (BOTTOM OF FINISHED RIP RAP OUTLET PROTECTION CELL) ELEV = "C" ENERGY DISSIPATING DEVICE 12" WATE HDPE FROM SITE (9" RIP RAP) QUALITY INV. ELEV. _ "C" 1299 PONDING S ......... 0............................................................................ 1891'- ............................................ 36 MIN. LAYER OF • Al Ay v > L L �. L A 1 2 L L .� L MEDIA MIX THE MEDIA SHOULD BE COMPOSED OF A HOMOGENOUS MIX OF THE FOLLOWING: a. 75-85% MEDIUM TO COURSE WASHED SAND b. 8-10% FINES (SILT AND CLAY); AND c. 5-10% ORGANIC MATTER (SUCH AS PINE BARK FINES) MINIMUM MEDIA DEPTH ALL CELLS WITH TREES AND SHRUBS: 36 INCHES CELLS WITHOUT TREES AND SHRUBS: WITH NO IWS: 24 INCHES WITH IWS: 30 INCHES MEDIA P-INDEX LESS THAN 30 IN NSW WATERS LESS THAN 50 ELSEWHERE MEDIA MAINTENANCE MAINTAIN MEDIA SUCH THAT INFILTRATION RATE IS AT LEAST 1 IN/HR CONSTRUCTION SEQUENCE: 1.) DO NOT ALLOW FLOW INTO 810-RETENTION CELL UNTIL SITE IS STABILIZED. (PAVED / GRASS) 2.) CLEAN OUT CELL IF USED AS A SEDIMENT BASIN DURING CONSTRUCTION. 3.) INSTALL 8" LAYER OF STONE, UNDERDRAINS. 4.) INSTALL FILTER FABRIC, 4" WASHED SAND AND SOIL MEDIA. 5.) INSTALL 4- LAYER OF TRIPLE SHREDDED HARDWOOD MULCH IN ENTIRE CELL. /. • PROPOSED STORMWATER 1310-RETENTION CELL '$A'$ SCALE 1 " = 40' 10yr STORM DETENTION PONDING ELEV. = "G" -9" OPENING (INSTALL TRASH RACK/SCREEN ON OPENINGS) ELEV. = "A" TOP OF OCS #9 (OVERFLOW STRUCTURE) W/ MANHOLE RING AND LID PRECAST FLUSH INTO TOP BERM TOP ELEV. _ "F" 10' EMERGENCY SPILLWAY ELEV. _ "1" III _.._.._.._.._.._.._.._.._. III III III III III ................ III III III III III III III III III �II� IIIIII IIII INV. ELEV.= "E$$ PROPOSED 24" HDPE (WTJ) STORM DRAIN TO JB LINE 0 13.16% IIIII III IIIII III IIIIII III IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII i� INVERT OF OTCB 1711 III III III III III III III III III -(INTERIOR OF BOX) ELEV. _ "H" it 24" I�- " TO 12" BELOW )ISCHARGE 9" d50 STONE (RIP RAP) RIP RAP ENERGY & VELOCITY DISSIPATER SECTION NOT TO SCALE BIO-RETENTION CELL TABLE CELL # ELEV. "A" ELEV. "B" ELEV. "C" ELEV. "D" ELEV. "E" ELEV. "F" ELEV. "G" ELEV. "H" ELEV. "I„ # OF CLEANOUTS Wq VOLUME REQUIRED Wq VOLUME PROVIDED A 2098.00 2098.00 2097.00 2096.00 2095.16 2100.00 2098.36 2093.00 2099.00 19 31,005 CF 42,730 CF 16' PROPOSED OUTLET #8 12" HIGH RIP RAP ENERGY & VELOCITY W/ FILTER STONE 24' \ ,(TOP OF WEIR) PROPOSED FOREBAY #1 SCALE 1 " = 20' PROPOSED 9" d50 STONE PROPOSED RIP RAP EXTENDED TO �� /OUTLET #5 ELEV. 2098'_34' _ _ _ \ 12" HIGH RIP RAP ENERGY & VELOCITY W/ FILTER STONE PROPOSED FOREBAY #3 SCALE 1 " = 20' AS NOTED ON FOREBAY DETAIL 9" RIP RAP (SEE RIP RAP III,,FIIIi1I�IIi1I�IIi1I�,i1I- ENERGY & VELOCITY DISSIPATER SECTION FOR ADDITIONAL DETAILS) BIO-RETENTION CELL FOREBAY WEIR SECTION N.T.S. 9" RIP RAP (SEE I ENERGY & VELOCITY DISSIPATER SECTION FOR ADDITIONAL DETAILS) BIO-RETENTION CELL EMERGENCY SPILLWAY SECTION PROPOSED 9" d50 STONE RIP RAP EXTENDED TO ELEV. 2098' 29'5' PROPOSED OUTLET #7 PROPOSED FOREBAY #2 SCALE 1" = 20' PROPOSED 9" d50 STONE RIP RAP EXTENDED TO ELEV. 2098' R711 UPI �1► • i PROPOSED FOREBAY #4 SCALE 1" = 20' N.T.S. NOTES: 1. OVERFLOW STRUCTURE SHALL HAVE STANDARD STEPS 16" ON CENTER PRECAST INTO BOX DIRECTLY BELOW MANHOLE ACCESS AND NOT LOCATED ON SIDE OF BOX THAT HAS AN ORIFICE OR THE OUTLET PIPE. 2.) IN -SITU SOIL MUST NOT BE COMPACTED BY EQUIPMENT. 3.) CELL BOTTOM SHOULD BE SCARIFIED PRIOR TO CELL MATERIAL INSTALLATION TO PROMOTE INFILTRATION. 4.) THE MAXIMUM SIDE SLOPES FOR THE INSIDE OF THE BIO-RETENTION CELL SHALL BE 3: 1. (ELEVATION "F" TO ELEVATION "C") 5.) BIO-RETECTION CELL SHALL BE MULCHED AND PLANTED W/ TREES AND SHRUBS (SEE LANDSCAPING PLAN FOR PLANTINGS). 6.) HDPE PIPING LEAVING OCS SHALL HAVE WATER TIGHT JOINTS. 7.) OCS #9 SHALL BE A MIN. OF 5'x5' PRECAST CONCRETE BOX. KNOCK OUT PANELS (WAFFER BOX) SHALL NOT BE ACCEPTABLE. A MANHOLE RING AND LID SHALL BE PRECAST FLUSH INTO TOP OF LID. 8.) SOIL MEDIA SHALL EXTEND BENEATH THE ENERGY DISSIPATING DEVICE (FOREBAY) INSIDE BIO-CELL. 9.) TRASH RACK SHALL EXTEND FROM INVERT OF OCS OPENING WEIR TO INVERT OF TOP. TRASH RACK SHALL NOT HAVE ANY OPENINGS GREATER THAN 54" IN ANY DIRECTION AND SHALL BE MADE OUT OF A NON -CORROSIVE METAL MATERIAL W/A MIN j"0 (REBAR IS NOT ACCEPTABLE). 10.) THE BIO-RETENTION CELL MEDIA SHALL BE MAINTAINED IN A MANNER THAT RESULTS IN A DRAWDOWN OF AT LEAST ONE INCH PER HOUR AT THE PLANTING SURFACE. 11.) IMPERMEABLE LINER SHALL BE EXTENDED TO ELEVATION "C" IN THE 810-RETENTION CELLS. • • • ig • : • • • ----=ri 6" #57 STONE - 12" WIDE J SECTION "A"VIEW CURB FOOTER NOT TO SCALE FLOW _ PATH 11= 8' _7� 12„ 12" LAYER OF 12" STONE INV. OF TOP OF STONE _ , _ 114' j IN 20 INVERTOFCHANNEL I III -I I II M1 - 200 Ib TENSILE STRENGTH FILTER FABRIC SECTION "B" VIEW 12" WIDE NOT TO SCALE CURB FOOTER 12" LAYER OF 9" STONE TOP OF CURB (3 FT WIDE) ELEV. 2104.0' i-I -1 1 1-- 18 I a.. - 3 FT. WIDE STRIP 12 OF FILTER FABRIC CONCRETE DETAIL NCDOT CURB NOT TO SCALE STD. 846.01 8" X 18" W/ FOOTER 12" LAYER OF 9" STONE (3 FT WIDE) - 3 FT. WIDE STRIP OF FILTER FABRIC NCDOT CURB STD. 846.01 8- X 18" W/ FOOTER NOTES: 1.) BOTTOM WIDTH SHALL BE 24" W/ 3:1 SIDE SLOPES. 2.) 92 LF LEVEL SPREADER LENGTH. 3.) EXTEND CONCRETE CURB LEVEL SPREADER AROUND END FOR 10' (LENGTH NOT INCLUDED IN NOTE #2). 4.) EXTEND CONCRETE CURB UP AND AROUND OUTLET #1 AS TO DIRECT FLOW INTO LEVEL SPREADER AND OVER CONCRETE CURB PRIOR TO BYPASSING AROUND CONNECTION TO FES. NCDOT CURB STD. 846.01 8" X 18" W/ FOOTER NOT TO SCALE PROPOSED LEVEL SPREADER #1 DETAIL NOT TO SCALE PIPE END SECTION WGLA ENGINEERING, PLLC 724 5th AVENUE WEST HENDERSONVILLE, NC 28739 (828) 687-7177 WGLA.COM NC LICENSE P-1342 SunCap PROPERTY GROUP" Suncap Warehouse Town of Mills River Henderson County North Carolina dNt�AS A�I. �jlklt, - 07CO3 F7 b148D... °o - o 4990 0 = °�°off °,ciN°°°�°�J //�/AM ?' 5/2021 �1111110 REVISIONS DATE DESCRIPTION • V Know what's below. Call before you dig. PROJECT NUMBER: 20176 DATE: 4/21 DRAWN BY: KHC CHECKED BY: WRB Bio-Retention Cell "A" C-302 SCALE: As -Noted -On -Sheet