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T <br /> ATC Associates Inc. <br /> Y <br /> 1117 Lone Palm Avenue,Suite 201 <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> Fax:209-579-2225 - <br /> January 3,2008 <br /> 54.25291.0001 <br /> i <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Division <br /> 600 East Main Street <br /> Stockton,California 95202 <br /> Subject: Workplan Addendum for Subsurface Investigation at Former Raymond Greer <br /> Construction Facility Located at 15634 Steinegul Road, Escaton, California. <br /> I <br /> Dear Ms. Duncan: <br /> At the request of San Joaquin County Environmental Health Division (EHD), ATC Associates <br /> Inc. has prepared this workplan for performance of additional subsurface investigation activities <br /> at the above referenced facility. This workplan outlines procedures and practices to be utilized <br /> during field investigations. <br /> I <br /> The subsurface investigation will be performed utilizing Cone Penetrometer Testing (CPT) <br /> techniques to aid in development of a hydrogeologic model of the site. The purpose of the <br /> additional subsurface investigation activities is to evaluate the vertical and lateral extent of <br /> impacted groundwater and to determine the need for the installation of additional monitoring <br /> wells at the site. The scope of work was discussed in a meeting with ATC and EHD on <br /> December 14, 2007 and in subsequent correspondence from EHD on December 17,2007. <br /> SITE LOCATION <br /> The site is located on the east side of Steinegul Road and south of the Lone Tree Road in <br /> Escalon, California, as shown on Figure 1. The site vicinity is primarily residential and <br /> agricultural,and the site is currently occupied by a single-family residence. <br /> BACKGROUND <br /> In May 1987, one 550-gallon gasoline underground storage tank (UST) and one 1,000-gallon <br /> gasoline UST were removed from the site by H&H Ship Service. The USTs were transported <br /> and disposed of at the Levin Metal Corporation disposal site in Richmond, California. A soil <br /> sample collected from beneath the 1,000-gallon UST contained detectable concentrations of <br /> benzene,toluene, ethyl benzene,and xylenes(BTEX) constituents. <br /> %v:\25291\reporls\wkpCPT.dm I <br />