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2-4" COBBLES AROUND <br />BUBBLE UP GRATE <br />BIORETENTION SOIL MIX <br />PER SAN MATEO COUNTY <br />WATER POLLUTION PREVENTION <br />PROGRAM C.3 REGULATED <br />PROJECTS GUIDE APPENDIX K. <br />iiiiiiiiIAIIIII <br />::D —+ <br />4" SOLID PVC <br />w SUBDRAIN PIPE <br />Q S=1% MIN <br />w _l I F <br />c <br />I~ <br />J <br />roEl <br />Q �i <br />ry <br />o �I�II <br />w <br />-111= <br />4" PERFORATED PVC PIPE <br />TO DIFFUSE STORM WATER <br />(HOLES FACE DOWN) <br />PER SHEET GP -1 <br />BUBBLE UP <br />5" SQUARE GRATE NDS <br />GRATE OR EQUAL <br />4" SOLID PVC PLANTING IN TRENCH AREA <br />SUBDRAIN PIPE PER NOTE 2, THIS SHEET. <br />INFILTRATION TRENCH <br />NOT TO SCALE <br />NOTES: <br />1. INFILTRATION TRENCH TO BE CONSTRUCTED PER <br />SAN MATEO COUNTYWIDE WATER POLLUTION <br />PREVENTION PROGRAM (SMCWPPP) C.3 REGULATED <br />PROJECT GUIDE SECTION 6.4. <br />2. APPROVED PLANTS FOR INFILTRATION TRENCH ARE <br />PER APPENDIX A OF THE SMCWPPP C.3 <br />REGULATED PROJECTS GUIDE. <br />3. CONTRACTOR TO RIP BOTTOM OF TRENCH. <br />NATIVE SOIL <br />GEOTEXTILE FILTER FABRIC <br />(MIRAFI 700 OR EQUIVALENT) <br />4" PERFORATED <br />PVC RISER <br />AGGREGATE ROCK LAYER <br />I-111= <br />1.5" TO 2.5" DIAMETER <br />CAP 4" RISER PIPE AT <br />BOTTOM OF GRAVEL LAYER <br />BEDDING SAND <br />EXHIBIT B <br />128 IRIS STREET <br />CITY OF REDWOOD CITY SAN MATEO COUNTY CALIFORNIA <br />DATE: AUGUST 31, 2020 SCALE: NOT TO SCALE <br />PAGE 2 OF 2 <br />c � SAN SACRAMENTO <br />(916) 866-0322 <br />1877 <br />SACRAMENTO (916) 375-1677 <br />WWW CBANDG COM <br />CIVIL ENGINEERS • SURVEYORS • PLANNERS <br />F:13085-000\REDWOOD CITY1128 IRIS S RACADIEXHIBITSIXB-EXHIBIT B_0&M.DWG <br />ATTY/AGR.2020.225/SF19G, LLC (128 Iris Street) (Page 10 of 14) <br />