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� v <br /> A S S O C i A T E S I N C <br /> Summary Report of <br /> Additional Subsurface Investigation <br /> Deep Well Installation <br /> . Diamond Walnut Growers <br /> 1050 South Diamond Street <br /> Stockton, California <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc. (ATC) has performed a subsurface investigation on behalf of Diamond <br /> Walnut Growers (DWG) at the facility located at 1050 South Diamond Street in Stockton, <br /> California (Figure 1). This work was done at the direction of California Regional Water Quality <br /> Control Board (RWQCB) in their correspondence dated March 20, 2003. The purpose of the <br /> additional subsurface investigation was to evaluate the vertical extent of impacted groundwater <br /> at the site and to evaluate the condition and construction details of the on-site facility well. The <br /> subsurface investigation was conducted in general accordance with the workplan titled: <br /> Workplan for Deep Well Installation at Diamond Walnut Growers, 1050 South Diamond Street, <br /> Stockton, California, dated January 28, 2003. The work was authorized by Mr. Mike Lescisin of <br /> DWG. <br /> � I <br /> The findings of the subsurface investigative activities are summarized in the following report. <br /> 1.1 Objective <br /> The purpose of the additional subsurface investigation was to evaluate the vertical extent of <br /> impacted groundwater at the site and to evaluate the condition and construction.details of the on- <br /> site facility well. <br /> 1.2 Site Location <br /> The DWG plant is located northeast of the intersection of Charter Way and South Diamond Street in <br /> Stockton, California (Figure 1). The site boundaries along with pertinent features are shown on <br /> Figure 2. <br /> 1.3 Site Background <br /> The DWG plant is located northeast of the intersection of Charter Way and South Diamond Street in <br /> Stockton, California (Figure 1). According to DWG, the facility has been operating as a walnut <br /> processing plant since the 1950s. Five underground concrete vaults were located north and east of <br /> the main processing building and formerly contained refrigerants used in the plant cooling systems <br /> (Figure 2). Vaults 1, 5, and 6, installed between 1974 and 1976, were concrete and historically <br /> contained propylene glycol. <br /> w:lwardpro162583\reportsldeep well inst.doc 1 <br />