Laserfiche WebLink
SAN MATEO COUNTYWIDE WATER POLLUTION PREVENTION PROGRAM <br /> rate for the biotreatment soil is 5 inches per hour. The long-term desired maximum <br /> infiltration rate is 10 inches per hour, although initial infiltration rate may exceed this to <br /> allow for tendency of infiltration rate to reduce over time. <br /> • Filter fabric shall not be used in or around underdrain trench. <br /> • The underdrain shall include a perforated pipe with cleanouts and connection to a storm <br /> drain or discharge point. Clean-out shall consist of a vertical, rigid, non-perforated PVC <br /> pipe, with a minimum diameter of 6 inches and a watertight cap fit flush with the ground. <br /> • There shall be adequate fall from the underdrain to the storm drain or discharge point. <br /> CONSTRUCTION REQUIREMENTS FOR ALL BIOTREATMENT SYSTEMS <br /> • When excavating, avoid spreading fines of the soils on bottom and side slopes. <br /> Remove any smeared soiled surfaces and provide a natural soil interface into which <br /> water may percolate. <br /> • Minimize compaction of existing soils. Protect from construction traffic. <br /> • Protect the area from construction site runoff. Runoff from unstabilized areas shall be <br /> diverted away from biotreatment facility. <br /> MAINTENANCE CONSIDERATIONS FOR ALL TREATMENT MEASURES <br /> ▪ A Maintenance Agreement shall be provided. <br /> • Maintenance Agreement shall state the parties' responsibility for maintenance and <br /> upkeep. <br /> • Prepare a maintenance plan and submit with Maintenance Agreement. Maintenance <br /> plan templates are in Appendix G. <br /> R <br /> RAISEO INLET <br /> A EANWi A <br /> A N <br /> a 3 X OUIROW /3J <br /> 0 IC( 10' <br /> STRUCNPh1 / Y/Slx!, ;i ri <br /> PLANTER WALL / - p ,Y \ MILES (AR SPLASH BLOCK MOLES Ch SPLASH BLOCK OR SRA9i RtCCK ��RU N 1 SPLASH MOCK <br /> STRUCTURAL / DOWN SPORT DOWN SPOUT OOWN SPORT DOM <br /> PLANTER Well BUIIN,NC <br /> WALL <br /> Figure 6-8: Plan view of long, linear planter, with inlets to the planter distributed along its length at 10' intervals. <br /> PAGE 76 CHAPTER 6 <br /> ATTY/AGR.2016.231/849 Veterans RWC, LLC - STMMA <br />