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OVERFLOW DRAIN <br />r2" MIN. <br />■ <br />6" MIN. � j � j <br />� <br />8" SOLID PVC RISER <br />0 <br />REATMENT SOIL, <br />• <br />TE 3 <br />HICK CONCRETE <br />--� -�a <br />TH WAYS <br />ALTRANS CLASS <br />ERMEABLE ROCK <br />4" DIA. PERFORATED SLOPED <br />UNDERDRAIN (SLOPE AT 0.5%) WITH <br />NOTES: PERFORATIONS 60' APART ON PIPE <br />1. SEE LANDSCAPE PLANS & SPECIFICATIONS FOR PLANTING MATERIALS WITHIN BIORETENTION <br />AREAS <br />2. PLACE 4" MIN. DIA. APPROVED NOYO COBBLE (OR APPROVED EQUIVALENT) FLUSH WITH <br />CHANNEL SURFACE AROUND ALL STRUCTURES WITHIN BIORETENTION AREA (DRAINAGE <br />BUBBLERS, OVERFLOW DRAINS, SIGNS, LIGHT POSTS, IRRIGATION BOXES, ETC.), EXTENDING <br />12" FROM EDGE OF STRUCTURE. <br />3. SOILS IN THE FACILITY SHOULD MEET BIOTREATMENT SOIL SPECIFICATIONS APPROVED BY <br />THE REGIONAL WATER BOARD (PER SAN MATEO COUNTY C.3 MANUAL). A MINIMUM <br />PERCOLATION RATE OF 5 INCHES/HOUR AND A MAXIMUM PERCOLATION RATE OF 10 <br />INCHES/HOUR ARE REQUIRED. PLANTING SOIL LAYER SHOULD BE AT LEAST 18 INCHES DEEP. <br />CONTRACTOR TO SUBMIT MATERIAL CERTIFICATES SIGNED BY THE MATERIAL PRODUCER, <br />CERTIFYING THAT SOIL COMPLIES WITH, OR EXCEEDS, SPECIFIED REQUIREMENTS. <br />4. EXPOSED PVC PIPE WITHIN BIORETENTION AREAS, SUCH AS OVERFLOW RISERS, SHALL BE <br />PAINTED BLACK. <br />5. NOYO COBBLES (4"-6" IN DIA.), OR APPROVED EQUIVALENT, SHALL BE PLACED IN A 2'X2' <br />AREA UNDER DOWNSPOUTS THAT SPILL AT GRADE. <br />FLOW-THROUGH PLANTER <br />BKF ENGINEERS EXHIBIT "B" <br />N. FIRST STREET <br />SUITE 600 STORMWATER CONTROL PLAN <br />SUIT <br />SAN JOSE, CA 95112 THE AGORA - 2950 BAY ROAD <br />(408) 467-9100 <br />www.bkf.com Drawn SH Checked DP Approved DP <br />Job No. 20201556 Date 12/20/2024 Sheet 3 of 3 <br />