5.a 13260 182nd Street N_Potential Rain Gardens_28Apr202113260 182nd St N, Scandia, MN - Variance Request Stormwater Management Plan– Potential Rain-Garden Areas
Potential Rain-Garden
Potential Rain-Garden
Potential Rain-Garden
DETAIL NOT TO SCALEPROFILE SECTIONNOTES:1.FULL EXCAVATION AND SOIL MEDIA IMPORT NOT PERMITTED UNTIL IMPERVIOUS AREA CONSTRUCTION IS COMPLETE WITHIN CONTRIBUTING DRAINAGEAREA AND PERVIOUS AREAS ARE SUBSTANTIALLY STABLE, AS DETERMINED BY ENGINEER. A MINIMUM OF 18” DEPTH OF IN SITU SOIL SHALL REMAIN INBIORETENTION UNTIL ENGINEER APPROVAL.2.IF FACILITY IS USED AS A TEMPORARY SEDIMENT BASIN, CONTRACTOR SHALL OVER-EXCAVATE AND IMPORT MEDIA PER ENGINEER DIRECTION AT COST OFCONTRACTOR.DETAIL IS INTENDED FOR GUIDANCE PURPOSES ONLY; PERMIT APPLICATION SHALL INCLUDE PROJECT-SPECIFICDESIGNS AND DETAILS FOR DISTRICT REVIEW. ADDITIONAL PERMITS MAY BE REQUIRED BEYOND DISTRICT PERMIT.PERMITTEE SHALL BE RESPONSIBLE FOR AND ACQUIRE ANY ADDITIONAL REQUIRED PERMITS.XXX18" - 36"XXX.XXSEE LANDSCAPE RESTORATION PLANTOP OF BANK3:1 TYP.SEE DETAILINV. XXX.XXRAINGARDEN BIOMEDIA:80% WASHED COARSE SAND10% CERTIFIED ORGANIC COMPOST -MNDOT GRADE 210% PEATUNDISTURBED,UNCOMPACTED,INSITU SOILBOTTOM: XXX.XXSHALL BE GRADEDFLAT WITHOUT DIPSOR SWALESSUBGRADE: XXX.XXDECOMPACT SUBGRADEMINIMUM 18"CROSS SECTIONOUTLET TO SURFACE ATLOWER POINT IN ELEVATION,CAP WITH ATRIUM GRATE4" SOLID HDPEOR PVC PIPEELEVATION OVERFLOW (EOF):ALL OTHER TOP OF BERMELEVATIONS AT >6" ABOVE EOF12" BOTTOM OF GARDENMAINTAIN MIN.3:1 SLOPEBASIN FULLGATE VALVE (SEE DETAIL).INSTALL ABOVE BASIN ELEVATIONFLEXIBLE COUPLING JOINT. SWITCHTO NON PERFORATED DRAINTILE.4" PERFORATED HDPEUNDERDRAIN POSITION 12" FROMBACK OF BASIN, AND ALLOW 6"CLEARANCE FROM BOTTOM OFBIOFILTRATION MEDIA.18"-36" BIORETENTION MEDIAPER SITE REQUIREMENTS3" SHREDDEDHARDWOOD MULCHDECOMPACT SUBGRADEMINIMUM 18"GATE VALVE (SEE DETAIL).INSTALL ABOVE BASIN ELEVATION3" SHREDDEDHARDWOOD MULCH6"6"BIOFILTRATION DETAILREVISION DATE: DECEMBER 2019waterecologycommunity