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Retrofit Detail0 N CD N 0 0 4!40J49 ao;—o!8 0 0 �P U) > C N 0 01 \ .\�\i\\ / 3:1 SLOPE (OR GREATER, E.G.. 4: 1, 8:1, ETC) MSD TYPE 4 GEOTEXTILE FABRIC (SIDES ONLY) \ j (4) // 6" THICK SAND (ASTM C-33 FINE AGGREGATE) 6" THICK 3/8"0 GRAVEL /' (ASTM C-33 NO. 8) / '///// //./, ///.%//////., , r-//// WIDTH VARIES///////./ "// // //. //. ///// //// ///. i 7/////// 0) ////. //// 24 THICK (MIN) BSM ' ///' ////// //� ///�%/1 / // // // // ,c/ // \\ :\ \ 7 .\\ \\ 4"0 SCHEDULE 40 PVC PERFORATED PIPE, 3/8"0 HOLES, TWO SIDES, FACING DOWN, 2" OFF BOTTOM OF EXCAVATION TYPICAL SECTION SCALE: 1 "=2' CLEANOUT/ OBSERVATION WELL 3:1 SLOPE (OR \�\//\\/GREATER, E.G. 4.1, 8:1, ETC) MSD TYPE 4 GEOTEXTILE FABRIC (SIDES ONLY) OUTLET INVERT ELEV SHALL NOT BE ABOVE BOTTOM OF BSM 6" THICK 3/4"0 GRAVEL (ASTM C-33 NO. 6 OR 67) EXISTING SOIL SUBGRADE SHALL BE TILLED OR "RIPPED" 12" DEEP BEFORE BACKFILLING NOTES: (1) BIORETENTION SOIL MIX (BSM) = 80% SAND, 10% FINE GROUND MULCH, 10% "TOPSOIL", OR MIX PER MSD LANDSCAPE GUIDE FOR BMPS. (2) SEE MSD LANDSCAPE GUIDE FOR MULCH & VEGETATION. TREES PLANTED IN BSM SHOULD BE ANCHORED. (3) 90TH PERCENTILE (P=1.14") RAINFALL EVENT. 1-YR 24-HR & GREATER STORMS MAY BE PONDED ABOVE THIS, UP TO 36" HIGH. (4) OPTIONAL WHERE SAND CONTENT OF BSM IS HIGH (>80%).