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A S S O C I A T E S I N C <br /> Summary Report of Subsurface Investigation <br /> Diamond Walnut Giowers <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 April 12, 2002 The purpose of the <br /> additional subsurface investigation was to evaluate the horizontal and vertical extent of <br /> groundwater impacted with hexavalent chromium at the site The subsurface investigation was <br /> conducted in general accordance with the workplan titled Workplan for Additional Well <br /> Installation at Diamond Walnut Growers, 1050 South Diamond Street, Stockton, California, <br /> dated May 2002 and subsequent addendum dated August 2002 The work was authorized by Mr <br /> Mike Lescisin of DWG <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 horizontal and vertical <br /> extent of groundwater impacted with hexavalent chromium at the site <br /> 12 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 />' 1.33 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 /> Vaults 1 and 5 had 1,200-gallon capacities and Vault 6 had a 500-gallon capacity These vaults <br /> were located along the eastern side of the property adjacent to large walnut storage bins (Figure 2) <br />' Vaults 7 and 8, which were constructed with poured concrete and lined with fiberglass and asphalt, <br />' wIwordpro1625831reports\Well_install_rpt doe 1 <br />