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`'�✓ orf �.� <br /> GROUND ZERO ANALYSIS,INC. <br /> CP _.. <br /> (pry <br /> 1714 Main Street .- <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 ^' <br /> October 18, 2000 `iE <br /> Mr. Jeffrey Wong <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> 304 E. Weber Ave., 3rd Fl. <br /> Stockton, CA 95202 <br /> i <br /> Subject: Workplan for Additional Subsurface Investigation <br /> Harry's Auto Mart, 2662 N. Wilson Way, Stockton, CA(Site Code: 1306) <br /> Dear Mr. Wong: <br /> This Workplan is submitted on behalf of John and Maxine Ferraiolo in response to your directive dated <br /> July 24, 2000. This Workplan describes the proposed methodology for further investigation and <br /> definition of the lateral and vertical extent of soil and groundwater contamination, and the installation <br /> of three groundwater monitoring wells at the subject property. <br /> BACKGROUND INFORMATION <br /> Site Description and Hydrogeological Setting <br /> The site is located in east central Stockton approximately one mile west of Highway 99 (Figure 1). - <br /> The nearest naturally occurring body of surface water is the Calaveras River, located approximately <br /> one mile to the north. Approximately 1/2 mile north of the property, between the property and the <br /> Calaveras River is the Stockton Diverting Canal, a tributary to the River. Surface elevation at the site <br /> is approximately twenty-one feet above sea level. <br /> Based upon published data from the San Joaquin County Flood Control and Water Conservation <br /> District(Spring 1997 Groundwater Report), groundwater was expected to have been encountered at a <br /> depth of approximately 55 feet below grade in the site vicinity. Data from an adjacent property reveal <br /> that historic low groundwater occurred in 1992 at approximately 85 feet below grade. Water levels <br /> may have reached historic highs in early 1999 when the depth to water in the site vicinity was <br /> approximately 36-38 feet below grade. According to the Flood Control District reports, groundwater <br /> flow has been predominantly toward the northeast although the property is located within an area <br /> subject to repeated variations in flow direction and gradient. Groundwater flow at the adjacent site has <br /> varied from southwesterly to northeasterly over a period of less than ten years. <br /> i <br /> i <br /> i <br /> Harrys\repoAs\workp1an3mws <br />