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ATC Associates Inc. <br /> V <br /> 1117 Lone Palm Avenue, Suite 201 Modesto, California 95351 <br /> v 209-579-2221 <br /> Fax:209-579-2225 <br /> ASSOCIATES INC. <br /> January 14, 2010 <br /> 54.62605.0001 i=;V 1 5 Z010 G� <br /> f �A <br /> Ms Victoria L. McCartney, REHS ENNUNMENTHEALTH <br /> San Joaquin County PERMIT/SERVICESS , <br /> Environmental Health Department Pt- b.'� tyE <br /> 600 East Main Street n S <br /> Stockton, California 95202 ^ AJ I Q } <br /> Subject: Additional Investigation Workplan <br /> Former Thiemann's Service <br /> 106 W. Second Street <br /> Ripon, California .1p <br /> Dear Ms. McCartney, <br /> On December 2, 2009, Ms. Vicki McCartney and Mr. Nuel Henderson of the EHD met at the <br /> site with Mr. Gerald Thiemann, the site owner, and Ms. Jeanne Homsey and Mr. Mike Sonke <br /> of ATC. Following review of the previously completed investigative work of the site, Ms. <br /> McCartney and Mr. Henderson communicated that additional delineation of the dissolved <br /> phase petroleum hydrocarbon plume in the groundwater north of the former tank pit was <br /> needed before the site could be presented for closure to the Regional Board. ATC <br /> Associates Inc. has prepared this workplan on Mr. Thiemann's behalf, to accomplish the <br /> additional required plume delineation. A <br /> In brief, the scope of work for site characterization activities will include advancing tWe <br /> vertical soil borings to collect groundwater samplesrchemical analysis of the groundwater <br /> samples; and preparing an investigation report detailing site activities. <br /> SITE DESCRIPTION <br /> The site is located west of Stockton Street and south of West Second Street in Ripon, <br /> California, as shown on Figure 1. The location is a mixed commercial and residential area. <br /> The site is currently occupied by Leo's Auto Service. <br /> ENVIRONMENTAL BACKGROUND <br /> In March 1991, three underground storage tanks (USTs) were removed from the site. <br /> Analyses of soil samples collected from the excavation indicated high concentrations of <br /> petroleum hydrocarbons were present in the soil beneath the tanks. Groundwater was not <br /> encountered in the excavation. The location of the former USTs are shown on Figure 2. <br /> 1 <br />