Stormtech MC-3500 chambers are installed within an embedment stone layer composed of washed, crushed, and angular stone ranging between AASHTO designations number 3 and 57. The entire stone base layer is wrapped in ADS Geosynthetics 601T non-woven geotextile with BX124GG geogrid placed underneath over subgrade preparation per the geotechnical report. Granular well-graded soil with less than 35 percent fines is compacted in 6-inch lifts to 95 percent proctor density beneath the pavement section. A 48-inch concrete manhole connects to standard and isolator rows via 12-inch HDPE manifolds.
11 SC-740 STORMTECH RETENTION CHAMBER DETAIL SUBGRADE PREPARATION PER GEOTECHNICAL REPORT 6" 12" 18" MIN 8' MAX 45" 9" 12" 6" 77" ADS GEOSYNTHETICS 601T NON-WOVEN GEOTEXTILE AROUND STONE BASE LAYERS EXCAVATION WALL MC-3500 END CAP MC-3500 CHAMBER BX124GG GEOGRID OVER GEOTEXTILE EMBEDMENT STONE LAYER WASHED, CRUSHED, ANGULAR STONE AASHTO DESIGNATION BETWEEN #3 AND #57 PAVEMENT PER PLAN GRANNULAR WELL-GRADED SOIL, <35" FINES COMPACT IN 6" LIFTS TO 95% PROCTOR DENSITY ISOLATOR ROW STANDARD ROW 48" CONCRETE MANHOLE INVERT PER PLAN INVERT PER PLAN INVERT PER PLAN SYSTEM MANIFOLD 12" HDPE MANIFOLD 12" HDPE MANIFOLD
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