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SAN MATEO COUNTYWIDE WATER POLLUTION PREVENTION PROGRAM <br /> 6.6 ervious Paving <br /> Best uses <br /> 6 .a6 t 4 • Low-speed residential roads <br /> ; r and alleys <br /> i•g■ 4i1 fv rf'4. 1 Parking lots <br /> P 3 • Driveways <br /> ° Sidewalks & Plazas <br /> 4 <br /> 2 m <br /> Advantages <br /> • Flow attenuation <br /> Cam_ • Volume reduction <br /> I 3� ' Removes fine particulates <br /> Reduces need for treatment <br /> Limitations <br /> ° May clog without periodic <br /> - <. Fly. cleaning <br /> Low-speed areas only <br /> Figure 6-25: The City of Menlo Park used pervious concrete • Higher installation costs <br /> for parking stalls and standard paving in the drive aisles in than conventional paving <br /> this public parking lot. <br /> Pervious pavement types include pervious concrete, porous asphalt, pervious concrete <br /> pavers and permeable interlocking concrete pavement (PICP). Except for PICP, <br /> pervious paving is used for areas with light vehicle loading and lightly trafficked areas, <br /> such as automobile parking areas. Crushed aggregate is sometimes used as pervious <br /> pavement as well. Table 6-2 shows possible applications for different types of pervious <br /> paving. The term pervious paving describes a system comprised of a load-bearing, <br /> durable surface constructed over a subbase/base structure typically consisting of <br /> compacted, open-graded aggregate. This layer or layers temporarily stores water prior <br /> to infiltration or drainage to a controlled outlet. The surface is porous such that water <br /> infiltrates across the entire surface of the material at a high rate. If an area of pervious <br /> paving is underlain with pervious soil or pervious storage material, such as a gravel <br /> layer sufficient to hold at least the Municipal Stormwater Regional Permit Provision <br /> C.3.d volume of rainfall runoff, it is not considered an impervious surface and can <br /> function as a self-treating area, as described in Section 4. 2. <br /> Please note that the CALGreen Building Code does not define pervious paving in the <br /> same way as the MRP. Projects that include pervious paving per CALGreen <br /> requirements must also verify that the pervious paving meets the MRP definition of <br /> pervious pavement. <br /> The Countywide Program gratefully acknowledges the contributions of Mr. David Smith, Technical Director <br /> of the Interlocking Concrete Pavement Institute, to this section of the C.3 Technical Guidance, including <br /> pavement sections, design details, and specifications. <br /> 6-28 CHAPTER 6 <br /> ATTY/AGR.2016.231t849 Veterans RWC, LLC - STMMA <br />