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�r <br /> ATTACHMENT <br /> PROPOSED GROUNDWATER RISK EVALUATION <br /> TRI VALLEY GROWERS FACILITY <br /> STOCKTON,CALIFORNIA <br /> APRIL 26,1995 <br /> SECOR international, Inc.•(SECOR) understands that an underground storage tank (UST) <br /> of unspecified capacity was removed from an active facility in Stockton, California(Site). <br /> The facility is paved over much of the area and owned by Tri Valley Growers (TVG). The <br /> Site is undergoing the remedial investigation process, and we further understand that TVG's <br /> objective of the investigation will be to ultimately receive regulatory closure from the San <br /> Joaquin County Public Health Services/Environmental Health Department (PHS/EHD). <br /> Chemicals of concern found in Site soils include total petroleum hydrocarbons as gasoline <br /> (TPH=g), and gasoline components benzene, toluene, ethylbenzene, and xylene (BTEX). <br /> Within the limited excavation where the UST was removed is a volume of native soils, some i <br /> of which have been affected by petroleum hydrocarbons and BTEX. The excavation is <br /> covered with clean pea gravel and plastic sheeting. On each of the four sides of the <br /> excavation, a soil boring was installed to assess the lateral extent of chemicals of concern. <br /> Apparently, soil samples were collected from below the paved surface to approximately 28 <br /> feet, where a localized subsurface "hardpan" deposit was encountered. No chemicals of <br /> concern were found in the soil samples collected, at the specific limits of detection. <br /> In summary, TVG's approach for remedial action will involve the direct removal of soil <br /> affected by TPH-g and BTEX, and an evaluation of the fate and transport of chemicals of <br /> concern if they are present in residual subsurface soils (following source soil removal). <br /> SECOR supports TVG's approach and proposes the Scope of Work described below, to <br /> address that portion of the remedial action which is focused on the evaluation of potential <br /> risk to groundwater quality. <br /> PROPOSED SCOPE OF WORK <br /> The following work Tasks are proposed for completion by SECOR: <br /> PRO/n 1132p.pro-511195 <br />