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FOOTHILL <br /> F XNG I N nFF I RR LIN G <br /> 8442 STORY RIDGE Y�AA <br /> WA X�TELOP2E CA 95843 <br /> PH:(916)729-5184 19 16)729=0593¢�_0593 <br /> June 28, 2011 <br /> Mr. Michael Infuma <br /> San Joaquin County Public Health Service <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202-3029 Site Code#1038 <br /> Global ID#70607700605 <br /> Subject: Michael D. & Sharon Ofivarez Property at 300 S. California St. Stockton, Ca. <br /> Site Evaluation per Request of 515111. <br /> Dear Mr. Infurna: <br /> Please find below a Site Evaluation Report with the information requested in the EHD letter of <br /> May 5,2011. The headings share the same number as the requested items. <br /> SITE EVALUATION <br /> Characterization of the Site <br /> In November of 1992 five fuel USTs and one used motor oil tank were removed. Soil samples <br /> taken from under the USTs and the dispensing equipment indicated the presence of <br /> hydrocarbons. The resultant investigation has lead to the following generalized model. <br /> There are three water bearing layers of concern. One sand layer at 20-40', another sand layer at <br /> 45-80' and the clays and silts at 90-100' which may receive leachate from the second sand layer <br /> above. The prominent direction of ground water flow is N 60'E with a gradient s=0.004ft/ft. <br /> The 20-40' sand layer is bounded on the West and the South by the bearing of the gradient. The <br /> 20-40' sand layer is bounded on the North by CPT#3. The 20-40' sand layer was encounter in <br /> the boring for MW-10 at depths of approximately 27'-32'. The 20-40' sand layer does not taper <br /> fast enough to be considered bounded by MW-10. The 20-40' sand layer is still unbounded on <br /> the East. <br /> The 45-80' sand layer is bounded on the West and the South by the bearing of the gradient, The <br />