BMP Monitoring Sites - Urban Drainage and Flood Control District
BMP Monitoring Sites - Urban Drainage and Flood Control District
BMP Monitoring Sites - Urban Drainage and Flood Control District
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UDFCD <strong>BMP</strong> MONITORING SITES<br />
Permeable Interlocking Concrete Pavement<br />
Installation Guidelines<br />
Select Blocks Select PICP blocks that have 8%<br />
open area or more. Follow<br />
manufacturer’s installation<br />
instructions, except that infill <strong>and</strong><br />
base course materials <strong>and</strong><br />
dimensions specified in this section shall be strictly<br />
adhered to.<br />
Infill Materials <strong>and</strong> The PICP openings shall be filled with AASHTO #8<br />
Leveling Course fractured aggregate <strong>and</strong> shall be placed on a one-inch<br />
thick leveling course of same #8 aggregate.<br />
Base Course<br />
The base course shall be AASHTO #67 coarse<br />
aggregate; all fractured surfaces. For volume<br />
calculations assume 30% of total volume to be<br />
open pore space. Unless an underdrain is<br />
provided, at least 6 inches of the subgrade<br />
underlying the base course shall be s<strong>and</strong>y <strong>and</strong><br />
gravelly material with no more than 10% clay<br />
fraction.<br />
S<strong>and</strong> Filter Layer The s<strong>and</strong> filter layer shall be ASTM C-33<br />
s<strong>and</strong> <strong>and</strong> will be installed under the base<br />
course <strong>and</strong> above the underdrain trench<br />
when one is used.<br />
Geotextile Fabric<br />
Place a woven geotextile fabric on top <strong>and</strong> bottom<br />
of the base course. Use a geotextile material that meets<br />
the following requirements:<br />
o ASTM D-4751 – AOS U.S. Std. Sieve #50 to #70<br />
o D-4633 – Trapezoidal tear strength ≥ 100 x 60 lbs<br />
o COE specified minimum open area ≥ 4%<br />
Impermeable Liner<br />
When expansive or NRCS Type D soils are present, or<br />
potential for groundwater contamination exists, install a<br />
16 mil thick impermeable liner on the bottom <strong>and</strong><br />
sides of the basin under the pavement. If soils are not<br />
expansive (i.e. NRCS Type A, B or C), use a woven<br />
geotextile material that meets the requirements specified
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