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File No. 20-1008-36 May 20, 1996 FIELD COMPACTION TEST RESULTS A total of 281 nuclear field density tests (designated 1 through 281) were performed on the foundation and barrier layers between June 7, 1995 to April 9, 1996. Results of all tests were verbally reported to Mr. Gabriel Karam of San Joaquin County and Granite Construction and are shown on Table VI, attached. In addition, 16 sand cone density tests (designated SC-1 through SC-16)were also performed at the site between November 8, 1995 to March 19, 1996, and are also shown on Table VI. In-place density and moisture content for Test Numbers 1 through 281 were performed in general accordance with ASTM Test Methods D-2922 and D-3017, respectively (nuclear probe tests method). In-place moisture contents for Test Numbers SC-1 through SC-16 were evaluated in general accordance with ASTM Test Method D-2216 (oven-dried test method). The sand cone density tests were performed in general accordance with ASTM Test Method D- 1556. Holes in the barrier layer due to testing were backfilled with commercially available powder form bentonite clay. A summary of field density tests consisting of test designations and location, in-place dry densities and moisture contents, laboratory-obtained maximum dry densities and optimum moisture content, and specified and achieved relative compaction is shown on Table VI, attached. Random bulk samples of the foundation and barrier materials tested were acquired in the field, sealed, and brought to our laboratory for determination of the maximum density- optimum moisture content in general accordance with ASTM Test Method D-1557 "A, B, or C." Sample frequency was in general accordance with the CQA plan. Laboratory compaction curves are presented on Plates 3 through 22 and are summarized in Table V. PERMEABILITY TESTING Thirteen block samples for permeability tests were acquired from the barrier layer after compaction requirements were achieved. Granite personnel used a John Deere 31OD backhoe equipped with 12-inch bucket or hand tools to cut out the block samples. After samples were acquired, barrier layer holes were backfilled with red clay and properly compacted. Samples were sealed in the field to prevent moisture loss and were transported to our laboratory for hand carving and testing. Laboratory permeability tests were performed in general accordance with ASTM D-5084 test method. Sample Nos. 1 through 12 were performed on the sideslopes and 13 on the flat top portion. Test locations are shown graphically on Plate 2. Results of these tests and their respective locations in northings and eastings are presented on Table IV below. 20-1008-36/MR960031 Page 5 of 7 01996 Kleinfelder,Inc.