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File No. 20-1008-36 " KLEINFELDER July 14, 1995 The SM stockpile borrow soil was transported by haul trucks from Granite's Tracy plant to the test pad where additional lab testing was performed. TFST PAD CONFIGURATION The test pads were approximately 150 feet in length and approximately 25 feet wide. The long axis of Test Pads 1, 2, and 3 were aligned in a east/west direction. Test Pads 4 and 5 were aligned in northwest/southeast and north/south directions, respectively. The County staked the test pad areas. The test pads were designed to consist of the following blends of materials with corresponding minimum compaction requirements (by percentage dry weight): • Test Pad 1 - 80% Stockpile/20% red clay at 95 percent relative compaction • Test Pad 2 - 70% Stockpile/30% red clay at 90 percent relative compaction • Test Pad 3 - 80% Stockpile/20% Ione clay at 92 percent relative compaction • Test Pad 4 -70% Stockpile/30% red clay at 90 percent relative compaction • Test Pad 5 - 100% Stockpile at 90 percent relative compaction Test s 1 through 4 are required to meet maximum permeability specifications of 1x10 P� g �1 Pe tY cm/sec. Test pads 1, 2, 3, and 5 were constructed on fairly level surfaces. Test Pad 4 was constructed on a slope, to evaluate compaction. This test pad has the same soil composition as Test Pad 2. Test pad 5 is required to meet a maximum permeability specification of lx 10-5 cm/sec, This test pad material type may be used as an alternative cover based on HELP modeling. SITE PREPARATION Prior to construction of the test pads, the site was cleared of all brush, grass and any other organic matter which had grown subsequent to the completion of the foundation layer. Foundation material removed during the course of this procedure was replaced and the foundation layer was restored to its original final grade and surveyed by the County. The foundation layer was compacted to a minimum relative compaction of 90 percent (ASTM test method D-1557). TEST PAD CONSTRUCTION Approximately 204 tons of SM borrow materials were placed by County personnel on Test Pads 1 and 3; 170 tons of SM borrow was placed on Test Pads 2 and 4. Approximately 15 inches of GSM.-md CH195 Page 2 of 10 July 14, 1995 20-1008-36 0 1995,Kleinfelder,Inc.