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r <br /> Irc(MV <br /> ATC Associates Inc. <br /> I 1117 Lone Palm Avenue, Suite 201 <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> A S S O C I A T E S I IN.c.: Fax:209-579-2225 <br /> � EIVE® <br /> January 18, 2012 v � ��� <br /> 54.62605.0001 <br /> JAN 19 2012 <br /> b <br /> Ms. Vicky McCartney ENVIRONMEN;ALHEAL• H <br /> PERM <br /> San Joaquin County IT/SERVICES <br /> Environmental Health'Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Workplan for Destruction of Groundwater Monitoring, e former Thiemann' <br /> Service Station; 106 West Second Street, Ripon, California; dated December 13, 2010, <br /> Site Code 1479 . . <br /> Dear Ms. McCartney: <br /> ATC Associates Inc. has prepared this workplan .for well destruction, on behalf. of Mr. Gerald <br /> Thiemann, for the above referenced site. <br /> The scope of work .in brief 'includes obtaining permits, pressure grouting the groundwater <br /> monitoring and remediation wells, and preparing a summary report. The scope of work is <br /> described in detail in the following paragraphs. <br /> SITE LOCATION <br /> The site is located at located at 106 W. Second Street, Ripon, California, as shown on Figure 1 <br /> and Figure 2. <br /> SITE HISTORY <br /> In March 1991, three underground storage tanks (USTs) were removed from the site. Analyses <br /> of soil samples collected from the excavation indicated high concentrationsof petroleum <br /> hydrocarbons were present in soil beneath the tanks. Groundwater was not encountered in the <br /> excavation. The location of the former USTs is shown on Figure 2. <br /> In July 1993, a subsurface investigation was conducted at the site to determine the extent of <br /> petroleum hydrocarbons ,present in soil and to determine if groundwater had been impacted. i <br /> The investigation included drilling eight soil borings and collection of soil.samples. Three of the i <br /> borings were completed as shallow groundwater monitoring wells (MW-1, MW-2, and MW-3). <br /> Analyses of soil samples indicated the greatest concentration of petroleum hydrocarbons in soil <br /> occurred from approximately ten feet below ground surface (bgs) to the groundwater surface at <br /> a depth of approximately 29 feet bgs and within a radius of 35 feet from the former UST pit. <br /> s:\Environmental\97861\reports\4gmr2005.doo- - - 1 - <br />