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Foothill Sanitary Landfill — Module 1 December 2003 County of San Joaquin Job No. 031602.00.02 inches, with the provision that the perforations in the pipe be changed from 0.2 inches to 0.18 inches. The perforations in the pipe were changed to 0.18 inches allowing the reduction of the D85 particle size. Additional discussion on this modification is included in Section 8.0. The sieve analysis results on the sump gravel indicated that a minimum of 90% of the material was retained on the 1 -inch sieve and less than 3% percent was passing the No. 200 sieve. The results indicated that the material met the project specifications. Hydraulic conductivity testing of the drainage gravel indicated an average flow rate of 5.4 cm/sec, which exceeds the requirement of 0.5 cm/sec. The hydraulic conductivity testing results for the sump gravel exceeded the laboratory equipment capacity, which is 10 cm/sec. The hydraulic conductivity of the sump gravel exceeds the requirement of 5 cm/sec. The sieve analysis and hydraulic conductivity test results on the drainage gravel and sump gravel testing are included in Appendix F and Appendix G, respectively. 4.5 Operations Layer 4.5.1 General Upon completion and approval of the drainage layer and geotextile separator (discussed in detail in Section 5), a two -foot operations layer was placed on the base and sideslopes of Module 1. The material used for the base and sideslope operations layer was obtained from the borrow areas located adjacent to Module 1. Vector's CQA Monitor observed the placement of the operations layer to ensure no damage occurred to the underlying geosynthetics. In instances were damage was observed by our CQA Monitor, the area was excavated, examined, and repaired. A leak location survey was then conducted over the completed operations layer as discussed in detail in Section 5.3.5. Vector Engineering, Inc. - 143E Spring Hill Drive - Grass Valley, CA 95945 - (530) 272-2448 19