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1117 Lone Palm Avenue, Suite 201 B <br /> kT <br /> NA C Modesto, CA 95351 <br /> Telephone 209-579-2221 <br /> Fax 209-579-2225 <br /> ENVIRONMENTAL • GEOTECHNICAL www.atcgroupservices.com <br /> BUILDING SCIENCES • MATERIALS TESTING <br /> February 12, 2020 <br /> Mr. Alan Buehler <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670-6114 <br /> Subject: Monitoring Well Destruction Workplan, Former Raymond Greer Property, 15634 <br /> Steinegul Road, Escalon, California. Lust Case: 390074 <br /> Dear Mr. Buehler: <br /> ATC Group Services LLC (ATC) has prepared this workplan on behalf of Mr. Raymond Greer, <br /> describing proposed activities and methodology pertaining to the destruction of groundwater <br /> monitoring wells associated with the above referenced site (Figures 1 and 2). This workplan was <br /> prepared at the request of the California Regional Water Quality Control Board (CRWQCB) in <br /> correspondence dated January 23, 2020. The scope of work is described in detail in the following <br /> paragraphs. <br /> SITE HISTORY <br /> In May 1987, H&H Ship Service removed one 550-gallon and one 1,000-gallon capacity underground <br /> storage tank (UST), from the subsurface. Each UST had contained gasoline. The USTs were <br /> transported and disposed of at the Levin Metal Corporation disposal site in Richmond, California. A <br /> soil sample collected from beneath the 1,000-gallon UST contained detectable concentrations of <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX) constituents. <br /> In March 1997, WHF, Inc. supervised the advancement of one soil boring to 80 feet below ground <br /> surface (bgs). Soil and groundwater samples collected from the boring contained detectable <br /> concentrations of total petroleum hydrocarbons as gasoline (TPHg) and BTEX. A water sample <br /> collected from the on-site drinking water well during the March 1997 investigation contained no <br /> detectable concentrations of dissolved phase petroleum hydrocarbons (TPHg and BTEX). <br /> In December 1998, BSK & Associates (BSK) advanced five soil borings at the site and completed <br /> four of the soil borings as monitoring wells (MW1 through MW4). Soil samples collected from borings <br /> B2 and MW2 contained detectable concentrations of TPHg and BTEX. Soil samples collected from <br /> B2 also contained detectable concentrations of methyl tertiary butyl ether (MTBE). <br /> In June and July 2000, WHF supervised the advancement of ten soil borings at the site. Six of the <br /> borings were completed as monitoring wells MW5, MW6, MW7, MW8, MW9, and MW10, and two of <br /> the borings were completed as vapor extraction wells VW1, and VW2. Soil samples collected from <br /> borings B101, B103, B104, VW1, and MW7 contained detectable concentrations of TPHg and BTEX. <br /> After MW7 was constructed, it was determined that it was not suitable for groundwater sampling <br /> because the well screen interval (30 to 45 feet bgs) was substantially higher than historical <br /> groundwater levels associated with the site. Consequently, the function of MW7 was reviewed and it <br />