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File No. 20-1008-36 May 20, 1996 areas which were greater than or equal to the 95 percent relative compaction standard. Approximately 73 percent of the tests showed compaction at moisture contents in excess of two percentage points above the optimum moisture content. This exceeds that observed in the test pads (9 percent). The average differential moisture content (moisture content minus optimum moisture content) for those measurements that were less than 2 percentage points above optimum was 1.32 percent. This is greater than the corresponding measurement made on the test pads (0.63 percent). All of the sand cone moisture contents performed were greater than 2 percent over optimum. According to the ASTM D1557 "N' testing procedure, optimum moisture content for compaction curves may vary up to 15 percent of the mean. In other words, for an average optimum moisture content of 12 percent, it may vary by about 2 percent. Noting the allowable testing variability, all of the moisture contents met project specifications. Thirteen laboratory permeability samples were collected from the barrier layer and all had permeabilities equal to or less than 3.4xI0-7 cm/sec. This meets and exceeds the design standard of Ix10 cm/sec. Since the test pad shows that the SDRI and laboratory permeabilities give similar measurements, we therefore conclude that the laboratory permeabilities provide a direct indication of actual field permeabilities. Based on our observations and testing results, it is our professional opinion that the barrier and foundation layers were constructed in accordance with the revised CQA plan. Compaction curves, gradation, hydrometer analysis, and Atterberg Limits (when applicable), were all similar to those performed on test pad materials. Most importantly, laboratory permeability tests on the barrier layer indicated that the Granite stockpile soil/red clay mixture, has a permeability of less than 10-6 cm/sec. Because laboratory testing indicated final cover soil properties are similar to test pad characteristics, it follows that barrier layer field permeability meets the 10-6 cm/sec requirement. CERTMCATION This report was prepared under the direction of the undersigned and contains the CQA performed during the closure of Corral Hollow Sanitary Landfill. Kleinfelder certifies that the CQA Plan was implemented as proposed and that the construction proceeded in accordance with design criteria, plans, and specifications. The term certification is used herein as defined by Section 8870.6 of the California Business and Professions Code. Meinfelder performed its services in accordance with the standards that existed in San Joaquin County at the time this report was prepared. Respectfully submitted, IKLEINFELDEX INC. X Steve ahnke, C.E. Project E - er Ron einzen, G.E. Regional Manager 20-1008-3&AM960031 Page 7 of 7 ®1996 Kleinfelder,Inc.