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_i _ <br />SS—LOPE Ic <br />T <br />EXHIBIT B4 <br />2215 EL CAMINO REAL, REDWOOD CITY <br />STORM WATER MAINTENANCE EXHIBIT <br />OVERFLOW STRUCTURE" <br />12" DIAM. DOME <br />GRATED AREA DRAIN. <br />6" PONDING DEPTH — <br />3.J <br />SIDE <br />SLOPES <br />CURB oU�, <br />CUT _ <br />GRAVEL <br />DISSIPA TOR <br />BUBBLER BOX.. <br />PRECAST 12 X12' <br />DROP INLET <br />4" PVC ORA/N <br />PIPE FROM STORM <br />DRAIN SYSTEM / <br />INVERT PER PLAN <br />BOTTOM OF BOX MIN 6" <br />BELOW BOTTOM OF <br />B70RE7EN770N AREA <br />6" DIAMETER HOLE IN <br />BOTTOM OF BOX <br />6" DIAMETER X 2" <br />DEEP GRAVEL <br />INFIL 7RA 77ON <br />TG=23 OC <br />-iL <br />P2 <br />810 -SOIL MIX PER <br />APPENDIX "L' OF THE <br />SAN M47E0 C3 <br />TECHNICAL GUIDANCE. <br />CMU <br />BLOCK <br />WALL <br />3"" FREEBOARD <br />i 1.5' -�— <br />6" <br />TIT--T- <br />4" <br />IT--T <br />4" PERFORATED <br />UNDERDRAIN SLOPED AT <br />- 0.5$ MIN. PERFORATIONS <br />DOWN. CONNECT TO <br />PUMP BASIN. <br />SECTION B -B <br />BIO -RETENTION AREA DETAIL <br />NTS <br />ATTY/AGR.2017.009/2215 EI Camino Real - Chevron <br />CAL7RANS <br />CLASS 2 <br />PERMEABLE <br />MA 7ERIAL <br />