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SIGNET STL Project No. 00 10771 Rwfing Labs Page I 1 than 6 feet in height, the perforated pipe may be omitted in lieu of weep holes on 4 feet maximum spacing. The weep holes should consist of 4 inch in diameter holes (concrete walls) or unmortared head joints (masonry walls) and not be higher than 18 inches above the lowest adjacent grade. Two eight-inch square overlapping patches of geotextile fabric (conforming to Section 88-1.03 of the CalTrans Standard Specifications for "edge drains") should be affixed to the rear wall opening of each weep hole to retard soil piping. R-Value Test Results and Pavement Design One composite R-Value sample was obtained from the project site at the locations shown on the attached site plan. The samples were tested in accordance with the State of California Materials Manual Test Designation 301. Results of the tests are as follows: r iEquilibrium 1 12-18" Fine to Medium Silty Sand (SM) 56 ,. These test results are moderate and indicate fair subgrade support characteristics under dynamic traffic loads. The following table shows the recommended pavement sections for various traffic indexes. Traffic Asphalt Class 11 CompactedIndex Concrete Aggregate Base* Subgrade"r 4.5 2.5" 5.0" 12.0" ` 5.0 2.5" 6.0" 12.0" 5.5 3.0" 6.0" 12.0" 6.0 3.5" 7.0" 12.0" ` 6.5 3.5" 9.0" 12.0" 7.0 1 3.5" 10.0" 1 12.0" * 95% compaction based on ASTM D1557 or CAL 216 •• 90% compaction based on ASTM D 155 7 or CAL 216 �- If traffic indexes are not available, an estimated index of 4.5 may be used for light automobile traffic, and an index of 7.0 for light truck traffic are typical values. The following recommendations are for light duty and heavy duty Portland Cement Concrete pavement sections. PORTLAND CEMENT PAVEMENT LIGHT DUTY Base*Traffic Portland Class 11 Compacted Index Cement Concrete*** Aggregate 4.5 1 5.0" 6.0" 12.0" 1417 No.Market Blvd,Suite 1 • Sacramento,CA 95834 • (916)568-5858 • Fax: (916)568-5813