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09/11.01 TGE 09:27 F.42 KLEINFELDER nn.-m.+u.+avrn+� amu.0 • File No. 20-3908-01 September 6, 2001 Mr. Martin Thorpe Jim Thorpe Oil Company 351 Beckman Road Lodi, CA 95240 Subject: FIELD DENSITY TESTS CANCUN RESTAURANT STOCK'TON, CALIFORNIA Dear Mr. Thorpe: This report presents the results of compaction tests taken at the subject project. As requested, a representative of our firm performed tests at the site on July 31 and August 2, 2001. Seven tests were taken by the nuclear probe test method at random locations on parking area subgtade. The depth of backfill was approximately 5.0 feet. A sample of the material tested was brcught to our laboratory for determination of the maximum density -optimum moisture content. The test results, summarized on the attached table, conform to the compaction requirements of the project specifications. RECOP&MENDATIONS Moisture Conditioning The silty clay subgrade material at the site is expansive. In order to reduce the risk of heaving, the clayey soils beneath concrete slabs should be wetted or pre-soaked to uniformly raise the moisture content of the soil to at least 3 percentage poirrts above the optimum moisture content or above the liquid limit of the soil, whichever is less. The depth of pre-soaking should extend to a depth of at least 18 incbes below floor slabs. ;Moisture Testing Moisture tests should be taken prior to placement of the moisture vapor barrier and/or reinforcing steel to confirm that the elevated moisture content has been achieved. We stress that weather conditions, e.g., temperature, wind, and humidity, at the time of moisture conditioning will determine the amount of time allowed between moisture ccaditioning and slab placement. Generally, moisture tests should be taken no more than three days prior to slab placement. However, in hot and/or windy weather, moisture tests should be taken no more tlxn approximately 24 hours prior to slab placement. 20-3908-D 1; 20 '' P 1066 Page, of t ILEI N5EIt��. 11N{�`'-'. Septembr 6, 2001 lel > Ott �'y�tld Street, Steck:on, CA 95205.4/ Ra �;2C9i 9:8-134 �:?Dg}94e-U6nl lax It 902