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100 YR HIGH WATER LEVEL ELEV = 6" OF TOPSOIL BASIN H CROSS SECTION BIOFILTRATION BASIN NTS TOP OF POND ELEV = BOTTOM OF POND ELEV = 915.00 912.00 (VARIE S ) 4 : 1 914.75 915.00 OUTLET ELEV =912.50 OUTLET PIPES (SEE PLANS) MULTIPLE OUTLET CULVERTS. SEE PLANS FOR ELEVATIONS. SLOPE T O E X I S T I N G EMERGENCY OVERFLOW ELEV =18" MIN3" OF 3 4-INCH WASHED STONE BIORETENTION SOIL (SEE NOTES) 6" PERFORATED PVC SUBDRAIN DAYLIGHT SUBDRAINS (SEE PLANS FOR ELEVATIONS) CLEANOUT (SEE PLANS FOR LOCATIONS/ELEVATIONS) FULLY ENCASE IN GEOTEXTILE FILTER FABRIC18" MINMIN 2" OF 12-INCH CHOKING STONE 6" OF TOPSOIL BIORETENTION SOIL (SEE NOTES) 4"4" 6" PERFORATED PVC SUBDRAIN 3 4-INCH WASHED STONE3"3"SUBDRAIN SECTION BIOFILTRATION BASIN CONSTRUCTION: A.WORK SHALL INCLUDE - ALL EXCAVATION AND CONSTRUCTION AS OUTLINED IN THE PLANS, SPECIFICATIONS AND DETAILS OUTLINING THE CONSTRUCTION OF THE FILTRATION BASIN. B.THE CONTRACTOR SHALL MAINTAIN SILT FENCE AROUND THE PERIMETER OF THE FILTRATION BASIN DURING ALL PHASES OF CONSTRUCTION. THE FILTRATION AREA MUST BE STAKED OFF AND MARKED TO KEEP ALL CONSTRUCTION TRAFFIC, EQUIPMENT AND MATERIAL STOCKPILES OUT OF THE PROPOSED FILTRATION AREA. C.THE CONTRACTOR SHALL ENSURE THAT THE FILTRATION BASIN IS NOT USED AS A SEDIMENT TRAP DURING CONSTRUCTION AND THAT NO RUNOFF ENTERS THE BASIN PRIOR TO THE COMPLETION OF CONSTRUCTION AND COMPLETE STABILIZATION OF SURROUNDING AREAS DRAINING TO THE BASIN. ALL UPLAND DRAINAGE MUST BE DIVERTED TO PREVENT RUNOFF FROM ENTERING FILTRATION BASIN WORK AREA. D.FILTRATION BASIN SHALL BE CONSTRUCTED AT THE END OF THE PROJECT AFTER ALL AREAS SURROUNDING IT AND DRAINING INTO IT HAVE BEEN CONSTRUCTED AND FULLY STABILIZED, THIS INCLUDES THE SANITARY SEWER. IN ORDER TO AVOID SOIL COMPACTION IN THE BASIN NO EQUIPMENT SHALL BE DRIVEN IN THE AREA OF THE BASIN PRIOR TO ITS CONSTRUCTION, AND WHEN IT IS CONSTRUCTED ONLY LIGHT EARTH MOVING EQUIPMENT WITH TRACKS SHALL BE USED. E.AFTER FINAL GRADING THE BASIN'S FLOOR SHALL BE TILLED TO A DEPTH OF AT LEAST 6 INCHES TO PROVIDE A WELL-AERATED, POROUS SURFACE. SMEARING OF THE SOIL IN THE BASIN SHALL BE AVOIDED AND IF SMEARING DOES OCCUR IT SHALL BE CORRECTED BY RAKING OR RETILLING OF THE BASIN. F.IMMEDIATELY FOLLOWING FILTRATION BASIN CONSTRUCTION, THE ENTIRE BASIN SHALL BE SEEDED AND STABILIZED AS INDICATED IN THE PLANS. FILTRATION BASIN MUST BE FULLY STABILIZED PRIOR TO ANY UPSTREAM RUNOFF BEING DIRECTED TO BASIN. BIORETENTION MEDIA MIX A, "WATER QUALITY BLEND": ·60 TO 70 PERCENT CONSTRUCTION SAND, ·15 TO 25 PERCENT TOPSOIL, AND ·15 TO 25 PERCENT ORGANIC MATTER SAND: PROVIDE CLEAN CONSTRUCTION SAND, FREE OF DELETERIOUS MATERIALS. AASHTO M-6 OR ASTM C-33 WASHED SAND. TOPSOIL: SANDY LOAN, LOAMY SAND, OR LOAM TEXTURE PER USDA TEXTURAL TRIANGLE WITH LESS THAN 5 PERCENT CLAY CONTENT. ORGANIC MATTER: MnDOT GRADE 2 COMPOST (SPEC. 3890) IS RECOMMENDED. P CONTENT BETWEEN 10 AND 30 MG/KG PER MEHLICH III (OR EQUIVALENT) TEST TO SUPPORT PLANT GROWTH. BASIN SEEDING: REFER TO SWPPP NOTES AND RESTORATION PLAN FOR BASIN SEEDING REQUIREMENTS. MIN 2" OF 12-INCH CHOKING STONE 100 YR HIGH WATER LEVEL ELEV = 6" OF TOPSOIL BASIN I CROSS SECTION BIOFILTRATION BASIN NTS TOP OF POND ELEV = BOTTOM OF POND ELEV = 912.00 909.00 (VARIE S ) 4 : 1 911.95 912.00 OUTLET ELEV =910.20 OUTLET PIPES (SEE PLANS) MULTIPLE OUTLET CULVERTS. SEE PLANS FOR ELEVATIONS. SLOPE T O E X I S T I N G EMERGENCY OVERFLOW ELEV =18" MIN3" OF 3 4-INCH WASHED STONE BIORETENTION SOIL (SEE NOTES) 6" PERFORATED PVC SUBDRAIN DAYLIGHT SUBDRAINS (SEE PLANS FOR ELEVATIONS) CLEANOUT (SEE PLANS FOR LOCATIONS/ELEVATIONS) FULLY ENCASE IN GEOTEXTILE FILTER FABRIC18" MINMIN 2" OF 12-INCH CHOKING STONE 6" OF TOPSOIL BIORETENTION SOIL (SEE NOTES) 4"4" 6" PERFORATED PVC SUBDRAIN 3 4-INCH WASHED STONE3"3"SUBDRAIN SECTION BIOFILTRATION BASIN CONSTRUCTION: A.WORK SHALL INCLUDE - ALL EXCAVATION AND CONSTRUCTION AS OUTLINED IN THE PLANS, SPECIFICATIONS AND DETAILS OUTLINING THE CONSTRUCTION OF THE FILTRATION BASIN. B.THE CONTRACTOR SHALL MAINTAIN SILT FENCE AROUND THE PERIMETER OF THE FILTRATION BASIN DURING ALL PHASES OF CONSTRUCTION. THE FILTRATION AREA MUST BE STAKED OFF AND MARKED TO KEEP ALL CONSTRUCTION TRAFFIC, EQUIPMENT AND MATERIAL STOCKPILES OUT OF THE PROPOSED FILTRATION AREA. C.THE CONTRACTOR SHALL ENSURE THAT THE FILTRATION BASIN IS NOT USED AS A SEDIMENT TRAP DURING CONSTRUCTION AND THAT NO RUNOFF ENTERS THE BASIN PRIOR TO THE COMPLETION OF CONSTRUCTION AND COMPLETE STABILIZATION OF SURROUNDING AREAS DRAINING TO THE BASIN. ALL UPLAND DRAINAGE MUST BE DIVERTED TO PREVENT RUNOFF FROM ENTERING FILTRATION BASIN WORK AREA. D.FILTRATION BASIN SHALL BE CONSTRUCTED AT THE END OF THE PROJECT AFTER ALL AREAS SURROUNDING IT AND DRAINING INTO IT HAVE BEEN CONSTRUCTED AND FULLY STABILIZED, THIS INCLUDES THE SANITARY SEWER. IN ORDER TO AVOID SOIL COMPACTION IN THE BASIN NO EQUIPMENT SHALL BE DRIVEN IN THE AREA OF THE BASIN PRIOR TO ITS CONSTRUCTION, AND WHEN IT IS CONSTRUCTED ONLY LIGHT EARTH MOVING EQUIPMENT WITH TRACKS SHALL BE USED. E.AFTER FINAL GRADING THE BASIN'S FLOOR SHALL BE TILLED TO A DEPTH OF AT LEAST 6 INCHES TO PROVIDE A WELL-AERATED, POROUS SURFACE. SMEARING OF THE SOIL IN THE BASIN SHALL BE AVOIDED AND IF SMEARING DOES OCCUR IT SHALL BE CORRECTED BY RAKING OR RETILLING OF THE BASIN. F.IMMEDIATELY FOLLOWING FILTRATION BASIN CONSTRUCTION, THE ENTIRE BASIN SHALL BE SEEDED AND STABILIZED AS INDICATED IN THE PLANS. FILTRATION BASIN MUST BE FULLY STABILIZED PRIOR TO ANY UPSTREAM RUNOFF BEING DIRECTED TO BASIN. BIORETENTION MEDIA MIX A, "WATER QUALITY BLEND": ·60 TO 70 PERCENT CONSTRUCTION SAND, ·15 TO 25 PERCENT TOPSOIL, AND ·15 TO 25 PERCENT ORGANIC MATTER SAND: PROVIDE CLEAN CONSTRUCTION SAND, FREE OF DELETERIOUS MATERIALS. AASHTO M-6 OR ASTM C-33 WASHED SAND. TOPSOIL: SANDY LOAN, LOAMY SAND, OR LOAM TEXTURE PER USDA TEXTURAL TRIANGLE WITH LESS THAN 5 PERCENT CLAY CONTENT. ORGANIC MATTER: MnDOT GRADE 2 COMPOST (SPEC. 3890) IS RECOMMENDED. P CONTENT BETWEEN 10 AND 30 MG/KG PER MEHLICH III (OR EQUIVALENT) TEST TO SUPPORT PLANT GROWTH. BASIN SEEDING: REFER TO SWPPP NOTES AND RESTORATION PLAN FOR BASIN SEEDING REQUIREMENTS. MIN 2" OF 12-INCH CHOKING STONE UNDISTURBED, NON-COMPACTED INSITU SOILS UNDISTURBED, NON-COMPACTED INSITU SOILS BRADFORD PARK DEVELOPMENT (PHASE 2) LENNAR HOMES LIC. NO.DATE PROFESSIONAL ENGINEER UNDER THE LAWS OF THE STATE OF MINNESOTA. I HEREBY CERTIFY THAT THIS PLAN, SPECIFICATION OR REPORT WAS PREPARED BY ME OR UNDER MY DIRECT SUPERVISION AND THAT I AM A DULY LICENSED JERREMY D. FOSS xxxx-xx-xx 55871 NOTE: THE CLARITY OF THESE PLANS DEPEND UPON COLOR COPIES. IF THIS TEXT DOES NOT APPEAR IN COLOR, THIS IS NOT AN ORIGINAL PLAN SET AND MAY RESULT IN MISINTERPRETATION. 26553 - 3 DETAILS (P2) DATE REVISION SCHEDULE DESCRIPTION BY SHEET TITLE PROJECT WITHOUT PRIOR WRITTEN CONSENT. INC. AND MAY NOT BE USED, COPIED OR DUPLICATED THIS DOCUMENT IS THE PROPERTY OF I & S GROUP, PROJECT NO. FILE NAME DESIGNED BY ORIGINAL ISSUE DATE DRAWN BY CLIENT PROJECT NO. REVIEWED BY DWG LOCATION: S:\PROJECTS\26000 PROJ\26500-26599\26553 FOSTER PROPERTY-ELK RIVER MN\26553 CIVIL-SURVEY\CIVIL PRODUCTION DRAWINGS\PHASE 2\26553 - 3 DETAILS (P2).DWG SAVED BY: TODD.KIRK 115OF 23 - 2024-08-26 22-26553 23 STORMWATER BASIN DETAILS 300 26553 23 ELK RIVER MINNESOTA STORMWATER BASIN DETAILS TTK TTK JDF Page 175 of 294