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GROUND ZERO ANALYSIS, INC, <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone:(209)838-9888 <br /> Facsimile:(209)838-9883 <br /> February 28, 2006 <br /> Mr. Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Workplan for Vertical Groundwater Investigation and <br /> Bench Test for In-situ Oxidation <br /> 7835 Thornton Road, Stockton, CA(APN#077-490-27) <br /> Dear Mr. Knoll: <br /> This Workplan is submitted on behalf of the Harold and Dena Knowles FamilyTrust <br /> Proposed scope of work for further subsurface investigation at the subject site (Figure 1 <br /> to correspondence from San Joaquin County Environmental Hea to present a <br /> December 28, 2005. lth Department (EHD) dated <br /> t <br /> The workplan describes the proposed methodology to drill and install a deep well to in <br /> vertical extent Of groundwater contamination, and to conduct a bench scale test to investigate the <br /> feasibility of in-situ oxidation as a remediation alternative for the site. All field k will <br /> the <br /> conducted in accordance with Ground Zeros Site Health and Safety Plan and work will be <br /> file at EHD. QA/QC Protocol on <br /> BACKGROUND AND SUBSURFACE INVESTIGATIONS <br /> The site previously operated as a retail gasoline facility, which distributed regular, un <br /> Premium unleaded gasoline. The fuels were stored onsite in four 6,000-gallon and two 1 <br /> l� leaded, and <br /> gallon underground fuel storage tanks. All buildings, 2,000- <br /> t�s, and associated product lines were removed on or before Mar h islands, <br /> 98underground fuel <br /> el storage <br /> site plan showing former site features. Figure presents a <br /> Groundwater Technology, Inc. GT <br /> I) Performed the initial 10, 1987, GTI collected confirmation soil samp es from beneath subsurface investigation. On April <br /> 34 feet. Analytical results indicated the presence of low levels of petroleum hnks 5 and ydrocarbon . 30 to <br /> GAGROUNDZE\KNOWLES.HAM\REpORTS\WKPLAN deenweii tiP w,.,__ <br />