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EXHIBIT B <br />SHEET 4 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 />PERCDLATION RATE. IN—SITU TESTING SHALL BE CONDUCTED TO VERIFY THAT THE MATERIAL MEETS <br />THE PERCOLATION REQUIREMENTS. <br />Na BARK MULCH SHALL BE PLACED IN THE VEGETATED AREA. <br />(N) CURB AND <br />VERA AVENUE <br />BIO -RETENTION AREA <br />TCM #12 <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, # 300 <br />HAYWARD, CAUFORNIA 94545 ROSEMLLE, CA 95861 <br />(P) (510) B87-4086 (P) (916)966-1338 <br />(F) (510) 887-3019 (F) (916)797-7383 <br />WWW. LEAS RAZE. COM <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 13 of 38) <br />