BMP Monitoring Sites - Urban Drainage and Flood Control District

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UDFCD BMP MONITORING SITES Porous Asphalt Pavement Asphalt Test Requirement Comments Binder Downdrain (ASTM D 6390) Air Voids of Compacted Mix Cantabro Abrasion Test (unaged sample) Moisture Susceptibility by the modified Lottman method (AASHTO T 283) Resistance to Stripping by Water (ASTM D 3625) 0.3% Maximum Test at 15ºC higher than production temperature 20% Minimum Compact using 50 gyrations of Superpave gyratory compactor 20% Maximum None 80% Minimum Tensile Strength Ratio (TSR) 95% Minimum Coating Area Only required for final mix Only required for final mix Choker Course The choker course aggregate shall be AASHTO #67 Aggregate with all fractured faces. The choker course aggregate shall have a uniform thickness of 2 inches. Base Course Sand Layer The base course aggregate shall be AASHTO #3 with a uniform thickness of 7 inches. The base course aggregate shall rest on top of a 1-inch thick sand cushion layer in addition to the required sand layer and on top of the geotextile fabric. The bottom sand layer shall be ASTM C-33 sand and will be installed under the base course and above the underdrain trench, when one is used.
UDFCD BMP MONITORING SITES Porous Asphalt Pavement Geotextile Fabric The geotextile fabric shall be installed below the sand layer. The woven fabric shall conform to the following requirements: o ASTM D 4751 – AOS U.S. STD sieve #50 to #70 o ASTM D 4633 – Minimum trapezoidal tear strength 100 x 60 lbs o Minimum COE specified open area of 4% Possible geotextile fabric may be US 670, Mirafi Filterweave 500, or approved equivalent. Impermeable Liner Fabric and Liner Contained Cells When expansive or NRCS Type D soils are present, or potential for groundwater contamination exists, install a 16 mil impermeable liner on the bottom and sides of all areas to be paved including the bottom of the underdrain trench. The impermeable liner shall be wrapped to the top of the perimeter walls and attached to the sides securely. If soils are not expansive (NRCS Types A, B or C) use woven geotextile fabric (as described above) as a liner. Place fabric and liner by rolling parallel to the contours starting at the most downstream part of the pavement. Provide a minimum of 18” overlap between adjacent sheets. Bring up geotextile fabric and impermeable liner to the top of the perimeter walls and attach with roofing tar or other adhesive or concrete anchors. Provide sufficient slack in the geotextile fabric and impermeable liner to prevent stretching during the installation of the infiltration bed, choker course and wearing course aggregate. Seal all joints of the impermeable liner to be totally leak free. Install lateral flow cut-off barriers using 16 mil or thicker PE or PVC membrane liner or concrete walls installed parallel to the contours (i.e. normal to the flow) to prevent flow of water downstream and then surfacing at the toe of the porous asphalt pavement installation. Distance (L max ) between these cut-off barriers shall not exceed:
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Page 4 and 5: UDFCD BMP MONITORING SITES Pervious
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Page 46 and 47: UDFCD BMP MONITORING SITES Sand Fil
Page 48 and 49: UDFCD BMP MONITORING SITES Open Bed
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Page 64 and 65: Orchard Pond EDB - Flow Dissipater

BMP Monitoring Sites - Urban Drainage and Flood Control District

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