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STABILIZED <br /> OVERFLOW <br /> OCS ( <br /> --------------------- ----------- --------------------- --------------------- ------------------------------------ -------------------------------------- --------------------- ..... ------------------ <br /> HIGH WATER LEVEL --- --- <br /> 10! RIES <br /> of <br /> OUTLET ELEV. <br /> ---------- <br /> HWL -------------- <br /> 0:1 NWL ELEV. WATER QUALITY VOLUME 1 <br /> INFILTRATION SHELF <br /> - <br /> OUTLET NWL L� <br /> NWL-1' BOTTOM NWL-1' 18" FLOW <br /> ELEVATION NWL FILTRATION <br /> TOP OF MEDIUM SEE <br /> FILTRATION DETAIL <br /> LINE WITH 2' EXCAVATE INFILTRATION AREAS <br /> OF ONSITE CLAY TO EXISTING SAND ELEVATIONS <br /> AND BACKFILL WITH ONSITE <br /> SAND WITH P200 < 8% <br /> STORMWATER BASIN DETAIL <br /> N.T.S. <br /> INFILTRATION BASIN CONSTRUCTION NOTES 4, <br /> CONSTRUCTION SEQUENCING <br /> 1. INSTALL SILT FENCE AND/OR OTHER APPROPRIATE EROSION CONTROL DEVICES TO PREVENT <br /> SEDIMENT FROM LEAVING OR ENTERING THE PRACTICE DURING CONSTRUCTION. <br /> 2. ALL DOWN—GRADIENT PERIMETER SEDIMENT CONTROL BMPS MUST BE IN PLACE BEFORE <br /> ANY UP GRADIENT LAND DISTURBING ACTIVITY BEGINS. <br /> 3. PERFORM CONTINUOUS INSPECTIONS OF EROSION CONTROL PRACTICES. <br /> 4. INSTALL UTILITIES (WATER, SANITARY SEWER, ELECTRIC, PHONE, FIBER OPTIC, ETC) PRIOR OUTLET INLET <br /> TO SETTING FINAL GRADE OF RETENTION DEVICE. <br /> 5. ROUGH GRADE THE SITE. DO NOT USE RETENTION AREA AS TEMPORARY SEDIMENT BASINS. PIPE PIPE] <br /> 6. PERFORM ALL OTHER SITE IMPROVEMENTS. <br /> 7. SEED AND MULCH ALL AREAS AFTER DISTURBANCE. <br /> 8. CONSTRUCT RETENTION DEVICE UPON STABILIZATION OF CONTRIBUTING DRAINAGE AREA. <br /> 9. IMPLEMENT TEMPORARY AND PERMANENT EROSION CONTROL PRACTICES. < <br /> 10. PLANT AND MULCH RETENTION DEVICE. <br /> 11. REMOVE TEMPORARY EROSION CONTROL DEVICES AFTER THE CONTRIBUTING DRAINAGE AREA <br /> IS ADEQUATELY VEGETATED. <br /> 4, <br /> GENERAL NOTES <br /> 1. IN THE EVENT THAT SEDIMENT IS INTRODUCED INTO THE BMP DURING OR IMMEDIATELY <br /> FOLLOWING EXCAVATION, THIS MATERIAL SHALL BE REMOVED FROM THE PRACTICE PRIOR TO <br /> CONTINUING CONSTRUCTION. <br /> 2. GRADING OF RETENTION DEVICES SHALL BE ACCOMPLISHED USING LOW—COMPACTION <br /> EARTH—MOVING EQUIPMENT TO PREVENT COMPACTION OF UNDERLYING SOILS. GRATE PER CITY <br /> 3. ALL SUB MATERIALS BELOW THE SPECIFIED BIORETENTION DEPTH (ELEVATION) SHALL BE STANDARD DETAIL <br /> UNDISTURBED, UNLESS OTHERWISE NOTED. <br /> RIM EL- 886.0 <br /> as <br /> SEED WITH MN SEED MIX 35-221 6 60)) <br /> DRY PRAIRIE GENERAL <br /> SEED WITH MN SEED MIX 33-261 <br /> STORM WATER SOUTH & WEST <br /> DEPTH REQUIRED TO DRAIN 12" RCP /// <br /> PRACTICE IN 48 HOURS OR LESS. OUTLET <br /> 3H: 1 L MAX. 12" RCP <br /> INLET PIPE <br /> 1 r2"TI RCP <br /> P OUTLET <br /> T <br /> P <br /> TIA, INV: 882.8 INV: 878.0 PIPE <br /> PIE <br /> _00 <br /> EL: 877.0 0 <br /> co <br /> 00 <br /> UNDISTURBED, UNCOMPACTED_z___1�___ <br /> INSITU SOIL I— — PRECAST CONCRETE SLAB BASE <br /> 90% ONSITE SAND P200 < 8%— POND OUTLET CONTROL STRUCTURE OCS-100 <br /> 10% ORGANIC LEAF COMPOST (NOT TO SCALE) <br /> SCARIFY BOTTOM 24" BEFORE <br /> PLACING AMENDED SOILS <br /> INFILTRATION FACILITY CROSS-SECTION <br /> NOT TO SCALE <br /> PI1NEERen ineerin <br /> g 00-ENG-123074-SHEET-DYES-GRAD <br /> CIVILENGINEERS LANDPLANNERS LANDSURVEYORS LANDSCAPE ARCHITECTS <br /> (651)681-1914 1 hereby certify that this plan was prepared by Revisions Date <br /> 2422 Enterprise Drive me or under my direct supervision and that I Name '6m�� Aa"'W_ 1. 2024-02-05 City Comments LENNAR HARMONYFARMS <br /> Mendota Heights,MN 55120 Fax: 681-9488 am a duly Licensed Professional Engineer Brian N.Molinaro Designed PRELIMINARY GRADING DETAILS 16305 36TH AVE.NO., SUITE 600 5.510 30 <br /> www.pioneereng.com under the laws of the State of Minnesota Reg.No. 47504 Date Drawn PLYMOUTH,MINNESOTA 55446 RAMSEY,MINNESOTA <br /> 2023 Pioneer Engineering,P.A. <br />