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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street `^ : 4�t a .S l <i '� : i ii <br /> Escalon, California 95320 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 4 <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 04 E. Weber Ave.Third Floor �F <br /> O. Box 388, Stockton CA-95201-0388 <br /> Approved ® �I <br /> June 29, 1999. - Denied ❑ II <br /> Condi 'ons C,��lv �" <br /> Mr. Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division �I <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 !� <br /> i; <br /> Subject: Workplan for Subsurface Investigation 'E <br /> Sunnyside Produce �I <br /> 8960 W. Walnut Grove Road, Thornton, CA I� <br /> I� <br /> Dear Mr. Knoll: <br /> This letter report is submitted by Ground Zero Analy is, Inc. (Ground Zero) on behalf of Sunnyside <br /> Produce to present a proposed workplan to conducta subsurface investigation at the subject site <br /> I (Figure 1). M <br /> The general scope of work will consist of drilling and sampling nine soil borings in the vicinity of tithe <br /> former underground storage tanks (UST) to investigate the extent of subsurface soil and <br /> F groundwater contamination. Five of the proposed borings. will be advanced using the direct push <br /> method. The remaining four borings will be advanced through the use of a hand auger. One discrete <br /> groundwater sample will be collected from each, of the five proposed direct push borings' to <br /> determine the lateral extent of groundwater impact. Following completion of the work, Ground <br /> Zero will submit a technical report that summarizes the methods and results of the investigation. ! <br /> k BACKGROUND i <br /> i� <br /> The site is currently operating as convenience storelimited subsurface assessment was performed <br /> by Ground Zero on December 3 and December 4, 1996. Analysis of the samples collected during'!the <br /> assessment indicated that soil and groundwater in the vicinity of the USTs were impactedr by <br /> petroleum hydrocarbons. Soil and groundwater analytical results from the December 1996 <br /> subsurface investigation are summarized in Table 1. Sample locations are shown on Figure 2. <br />'l Oil Equipment Services (OES) subsequently removed one 10,000-gallon diesel and two 10,000- <br /> gallon gasoline USTs along with associated plumbin on January 21, 1999 under permit from San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHD). Analytlical <br /> .j <br /> dataigroundze/manserlwp0599.doc <br />