SW6200102_Plan (SCM Detail)_20200608

U.S. ARMY CORPS OF ENGINEERSHPTC_CG508.dgnANSI DCHECKED BY:DRAWN BY:ISSUE DATE:SHEET ID FILENAME:B
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DESIGNED BY:1
A MARKSIZE:SUBMITTED BY:DATECONTRACT NO.:®of Engineers
US Army Corps
CATEGORY CODEDESCRIPTIONP:\Projects\017001\03 CAD_BIM\_Sheets\05_Civil\HPTC_CG508.dgn04-JUN-202008:41 171-20-13R. BOSTONW912PM-19-C-000769 DARLINGTON AVENUEWILMINGTON DISTRICTWILMINGTON, NORTH CAROLINAFORT BRAGG, NORTH CAROLINASOF HUMAN PERFORMANCE TRAINING CENTER (HPTC)FY18 PN 79443W912PM-18-R-0003SOLICITATION NO.:CERTIFIED FINAL FAST-TRACK (ISSUED FOR CONSTRUCTION)DECEMBER 2019NOT TO SCALE
DETAIL1

BIO RETENTION BASIN
LOW IMPACT BMP
TYP

REFER TO PLANS FOR FINISH GRADES.
POLLUTANTS ARE REMOVED ON THE SURFACE OF THE BIORETENTION CELL RATHER THAN WITHIN THE CELL.
TSS OR PATHOGENS IS THE TARGET POLLUTANT, THE HIGHER PERMEABILITY CAN BE USED BECAUSE THESE TWO
RATE FOR PERCENT FINES BETWEEN 8 AND 10 CAN BE APPROXIMATED DURING DESIGN BY LINEAR INTERPOLATION. IF
IN/HR FOR 8% AND 10% FINES, RESPECTIVELY, DEPENDING ON THE TARGET POLLUTANT. AN ESTIMATED DRAINAGE
THUMB, USING THE ABOVE-SPECIFIED MEDIA, THE INFILTRATION RATES SHOULD BE APPROXIMATELY 2 IN/HR AND 1
SHOULD FALL BETWEEN 1 AND 6 INCHES PER HOUR, WITH 1-2 INCHES PER HOUR BEING PREFERRED. AS A RULE OF
THE MEDIA SHOULD BE TESTED TO DETERMINE AN ACTUAL DRAINAGE RATE AFTER PLACEMENT. THE PERMEABILITY
SOIL FOR THE BIORENTENTION BASINS
NOTE: CUT SOIL FROM THE PROJECT SITE OR SOIL FROM THE BORROW PIT MAY NOT BE USED FOR THE ENGINEERED
PHOSPHORUS.
EXTREMELY IMPORTANT DESIGN ELEMENT. CELLS THAT ARE CONSTRUCTED OF HIGH P-INDEX SOILS CAN EXPORT
REGARDLESS OF THE TARGET POLLUTANT (HARDY ET. AL., 2003 AND HUNT ET. AL., 2006). THE P INDEX IS AN
HAVE THE SOIL ANALYZED. THE P INDEX FOR BIORETENTION SOIL MEDIA SHOULD ALWAYS RANGE BETWEEN 10 AND 30,
NC DEPARTMENT OF AGRICULTURE [NCDA] LABS TO BE ANALYZED. IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO
USED. ADDITIONALLY, THE PHOSPHORUS CONTENT OF THE SOIL MIX SHOULD BE LOW. SOIL MEDIA SHALL BE SENT TO
POLLUTANT. IN AREAS WHERE PHOSPHORUS IS THE TARGET POLLUTANT, LOWER (8 PERCENT) FINES SHOULD BE
BARK FINES). HIGHER (10 PERCENT) FINES CONTENT SHOULD BE RESERVED FOR AREAS WHERE TN IS THE TARGET
CLASSIFICATION), 8 TO 10 PERCENT FINES (SILT AND CLAY), AND 5 TO 10 PERCENT ORGANIC MATTER (SUCH AS PINE
SOIL MIX OF 75 TO 85 PERCENT BY VOLUME MEDIUM TO COARSE WASHED SAND (USDA SOIL TEXTURAL
OF STONES, STUMPS, ROOTS OR OTHER SIMILAR MATERIAL GREATER THAN 2 INCHES. IT SHOULD BE A HOMOGENOUS
*BIORETENTION “ENGINEERED SOIL” LAYER SHALL BE MINIMUM 30” DEEP. THE SOIL MIX SHOULD BE UNIFORM AND FREE
REFER TO SPECIFICATIONS
NON-WOVEN GEOTEXTILE
DESIGN VOLUME
PEAK ATTENUATION VOLUME
LAYOUT
TO PLAN SHEETS FOR
PIPES INTO RISER. REFER
TIE UNDERDRAIN SYSTEM

SOD
*SEE NOTE BELOW
30" MIN. ENGINEERED SOIL
NCDOT #57 CRUSHED ROCK THE PLANTING SURFACE
OF 18 INCHES BELOW
IWS ZONE A MINIMUM
SET THE TOP OF THE
PERFORATIONS
PVC PIPE WITH
SDR 35 SMOOTH WALL
6" SCHEDULE 40 OR

RISER
SHEET CG508
REFER TO DETAIL 2,
RISER STRUCTURE 18"IWS*
*
IWS=INTERNAL WATER STORAGE3:13:1

CONNECTION
TO BE WRAPPED AROUND
NON-WOVEN GEOTEXTILE
ENCASEMENT
CONCRETE
CAST IN PLACE
PIPE
PERFORATED
AS NECESSARY
MATCH INVERTS
PROVIDE SPACER TOCONCRETE COLLAR
TO SUPPORT
CLASS I BEDDINGVARIES
NOT TO SCALE
DETAIL2

RCP PIPE
PERFORATED PIPE TO CONCRETE PIPE CONNECTION
TYP

FINISH GRADE
POND BERM
OUTLET
PEAK ATTENUATION
"O" RING JOINT
WITH LOCKING
RCP CLASS 3
ONE PER UNDERDRAIN
CLEANOUT, MINIMUM
4" DIA ORIFICE

EACH SIDE OF PIPE
ROCK ABOVE AND ON
PROVIDE 3" CRUSHED
TOP ELEV
PLANTING ELEV
ELEV
PEAK ATTENUATION
STEPS
MASTIC (TYP.)
WATERPROOF

BASE 8' x 6' x 1'
ANTI-FLOTATION
W/STAINLESS STEEL HARDWARE.
AND SECTIONS SHALL BE STRAPPED TOGETHER
PROVIDED AT ALL CONSTRUCTION JOINTS IN RISER
CONTINUOUS RUBBER WATERSTOPS SHALL BE
NOTE:15"OF RISER
LOCATED ON 3 SIDES
6" HIGH X 36" LONG
WEIR DIMENSION
MIN WEIGHT - 23,587 LBS.
w/6" THICK SOLID WALLS
INSIDE DIMENSION
3' x 3' MIN CONCRETE RISER
RISER
NOT TO SCALE
DETAIL2
TYP
RISER STRUCTURE
AWAY FROM DAM.
PRE-CAST BOX. LID SHOULD OPEN
CLASP WITHIN THE INSIDE LIP OF
WITH HINGES AND HOLD DOWN
HORIZONTAL OPENING, MOUNTED
NO.6 REBAR W/ MAX. 12"
DOMED TRASH RACK
"O" RING JOINT
WITH LOCKING
RCP CLASS 3
3' MIN
EACH WAY24"18"(SEE CG601)
INV. ELEV
BASIN 2: 260.50
BASIN 1: 258.50
TOP ELEV
BASIN 2: 259.50
BASIN 1: 257.50
WEIR ELEV
FOR ELEVATIONS
REFER TO TABLE BELOW
NOTE:9"CG508S.HAGGARDM.MEYERG.LYNNSTORM DRAINAGEBIO RETENTION BASIN DETAILS