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File No. 20-1008-36 May 20, 1996 TEST PAD The five test pads were located at the northeast comer of the landfill. The test pads were constructed using a single lift method between April 13 and 19, 1995. Only the materials used in the first two test pads were used in final barrier layer construction. The remaining test pad materials were construction alternatives. Field and laboratory testing indicated that the single- lift method of construction on a mixture of 20 percent red clay and 80 percent stockpile materials, as well as 30 percent red clay and 70 percent stockpile materials both met project requirements and were approved in letters by the CRWQCB and CIWMB dated August 10, 1995. Test pad laboratory permeabilities were on the same order of martude as the SDRI test. The three test pad lab permeabilities were 4.2 x 10"7 cm/sec 1.5 x 10" cm/sec, and 4.3 x 10'' cm/sec; the SDRI permeability was 2.4 x 10'' cm/sec. The test pad (Test Pads 1 and 2 only) hydrometer and Atterberg Limit test results are summarized in Table I below. TABLE I: SUMMARY OF SECOND TEST PAD RESULTS Hydrometer Test Pad Analysis Percent Plasticity Liquid Soil Description Sand Silt Clay Index Limit I.Silty Sandy Clay 43 38 19 9 32 w/gravel(CL) 2.Silty Sandy Clay w/Gravel MLJ 41 39 20 12 32 The specified degree of relative compaction for the barrier layer is 95 percent at a moisture content of 2 percent above optimum. A relative compaction of 90 percent is specified for the side slope barrier layer. The majority of the landfill consists of sideslopes. The foundation layer is to be compacted to a minimum of 90 percent relative compaction at or near optimum moisture content. BORROW SOILS The borrow area soils were classified as brown clayey silty sand with some gravel (SM) and are referred to as Granite stockpile soils. Samples of the borrow soils were acquired by Kleinfelder prior to foundation and barrier layer construction for sieve analyses during cover construction. The sieve analyses indicated 43, 31, 25, 52, and 31 percent passed the No. 200 sieve. The SM borrow soils were transported by haul trucks to the site where additional lab testing was performed and is summarized in the section titled"Barrier Layer Construction." LANDFILL CONFIGURATION The site is located southeast of the intersection of Corral Hollow Road and Interstate 580. Corral Hollow Creek borders the southeast portion of the site. The site consisted of approximately 45 acres. Granite staked the landfill area in a 100-foot grid pattern based on northings and eastings prior to and during construction. The purpose of the staking was to establish grade control for foundation, barrier, and vegetative layers. 20-1008-36AM960031 Page 2 of 7 01996 Kleinfelder,Inc.