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6.A. - Page 55 of 81 <br />EXHIBIT B <br />SHEET 3 OF 4 <br />BIO -RETENTION SOIL CONSIDERATIONS <br />THE BIO—RETENTION PLANTING SOIL SHALL MEET THE REQUIREMENTS SET FORTH IN APPENDIX L OF <br />THE SAN MATEO COUNTY CLEANWATER PROGRAM C.3 STORMWATER TECHNICAL GUIDANCE HANDBOOK. <br />BIO—RETENTION SOIL SHALL HAVE A MINIMUM PERCOLATION RATE OF 5" PER HOUR AND MAXIMUM <br />PERCOLATION RATE OF 10" PER HOUR IF NATIVE SOILS DO NOT MEET THIS PERCOLATION <br />REQUIREMENT, AN ADMIXTURE SHALL BE MIXED INTO PLANTING SOIL TO ALLOW FOR A 5" PER HOUR <br />PERCOLATION RATE. IN—SITU TESTING SHALL BE CONDUCTED TO VERIFY THAT THE MATERIAL MEETS <br />THE PERCOLATION REQUIREMENTS. <br />NO BARK MULCH SHALL BE PLACED IN THE VEGETATED AREA. <br />OVERFLOW AREA DRAIN N TREATMENT <br />BUILDING 1 2.5't 2' <br />PLANT AREA AROUND TREATMENT <br />AREAS WITH HEARTY "ND -NOWT GRASS -TW. <br />7.7' <br />i <br />TREATMENT AREA SHOWN PER <br />PLAN (LANDSCAPE PER C.3 <br />REOUIRENIBM) <br />2' 8" . 2't <br />4' PERF SUBORA <br />N_'/ <br />PPE LAD ON BOTTOM OF TRENCH tO <br />S -0.5X MN \ <br />z <br />B' SOLD PIPE OUT TO RETENTION <br />AVAIERPROOF 1EA6RANE ON ALL SIDES <br />AND BOTTOM (70 BE APPROVED BY <br />SOILS ENGNEER) (DO NOT PLACE FILTER <br />FABRIC BETWEEN TREATMENT SOIL <br />AND DRAIN ROCK) <br />18' MIN. OF BKI-TREATMENT SOIL <br />PER APPENDIX K OF THE SAN <br />MATED COUNTY C.3 REGULATED <br />PRO,ECTS GUIDE. <br />12' MN. OF 3/4' CLASS II PERM ROCK <br />BIO -RETENTION AREA <br />TCM #11 <br />(SECTION VIEW) <br />Aw LEA & BRAZE ENGINEERING, INC. <br />CIVIL ENGINEERS - LAND SURVEYORS <br />BAY AREA REGION SACRAMENTO REGION <br />2495 INDUSTRIAL PKWY WEST 3017 DOUGLAS BLVD, If 300 <br />HAYWARD, CALIFORNIA 94545 ROSEMLLE, CA 95661 <br />(P) (510) 887-4086 (P) (916)966-1338 <br />(F) (510) 887-3019 (F) (916)797-7363 <br />WWW.LEAI3RAZE.CCM <br />211/217 VERA AVE, <br />REDWOOD CITY <br />SAN MATEO COUNTY <br />JOB NO 2180013 Cl SCALE: 1"= 20' <br />ATTY/AGR.2019.266/211/217 Vera (Page 12 of 38) <br />