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File No. 20-1008-49.001 December 9, 1993 Mr. Gabriel Karam San Joaquin County Building Department Post Office Box 1810 Stockton, CA 95204 Subject: RESPONSE TO LETTER FROM CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD HARNEY LANE LANDFILL/TEST PAD RESULTS SAN JOAQUIN COUNTY, CALIFORNIA Dear Mr. Karam: This letter is in response to a letter by Mr. Robert Evans of the California Regional Water Quality Control Board (CRWQCB) dated October 18, 1993, entitled "Test Pad CQA Results, Harney Lane Sanitary Landfill, San Joaquin County, California (Case No. 2598). At your request, we are providing clarification of our report "Summary of Test Pad Results, Harney Lane Landfill, San Joaquin County, California" dated July 8, 1993. The following explanations are in the order in which they are addressed in the CRWQCB letter: • Page 1, No. 1: The test pad foundation did meet compaction requirements. Although Test Nos. 1, 3, and 4 failed, these areas were reworked and retested as Test Nos. 6, 7, and 8, which were passing tests. These test results are listed on pages 1 and 2 of Table I in our report. • Page 1, No. 2: Although Test Nos. 21, 22, and 24 on the SM test pad did not initially meet the specified relative compaction, this test pad was reworked and retested. Retests of this test pad are Test Nos. 28, 29, and 30. There is an error in the reporting of the retest results in our report. Retest Nos. 26, 27, 28, 29, and 30 should correspond to the failing Test Nos. 15, 16, 21, 22, and 24, respectively, and not to Test Nos. 20, 21, 26, 27, and 29 as shown on Table 1, page 3. We also propose to perform two compaction tests within the vicinity of the proposed SDRI test in the SM test pad to verify compaction. Copyright 1993 KLeinfelder, Inc. Page 1 of 5