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SITE PHYSICAL CHARACTERISTICS <br /> In your 29 August 1989 correspondence, you stated that groundwater was reported to be at a <br /> depth of approximately 20 feet, although in American Environmental Management <br /> Corporation's Hydrogeologic Assessment and Tank Monitoring Plan for Gold Bond Building <br /> Products, Stockton, California, dated 3 March 1989, we stated that groundwater was <br /> encountered from 25.5 feet to 29 feet in depth. A continuous core sampler was utilized in <br /> drilling the first monitoring well using a 5-foot core sampler. Unsaturated conditions were <br /> encountered in the samples up to a depth of 25 feet, with a stiff confining layer of silt present <br /> above the saturated zone. The soil in the sampler was saturated from the 25.5' depth to the <br /> 29' depth. An unsaturated silt layer was encountered at 29'. Soil conditions were so stiff and <br /> well consolidated that the 5-foot continuous sampler was unusable during construction of the <br /> second well. <br /> Since groundwater levels in the wells installed stabilized at elevations higher than the <br /> elevation at which saturated conditions were encountered during drilling of the well borings, it <br /> is fundamental that the groundwater levels are potentiometric. <br /> „ �, Page 4 <br />