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14800 W Frontage Rd (Hwy 99) - 3 - 4 September 1998 <br /> Manteca, San Joaquin County <br /> • An off-site domestic well is to be installed at 14852 S Hwy 99, Manteca The new well is being <br /> provided to replace the former domestic well, which has been impacted by contamination from the <br /> Moore Petroleum site. Based on discussions with Ms Quynh Hoa of the State Water Resources Control <br /> Board (SWRCB), UST Cleanup Fund, the cost of installation of the offsite domestic well is to be <br /> reimbursed by the Cleanup Fund,pending Regional Board staff concurrence with site closure <br /> ' APEX completed a fate and transport study for the site The purpose of the study was to determine the <br /> potential impact to the on-site and off-site domestic wells Based on the model, no contamination is <br /> projected to impact the new domestic wells for the 10 years period (1997 to 2006), that was modeled <br /> The assumptions used in the model, although in some cases less conservative than they could have been, <br /> appear adequate, based on sampling data <br /> ' Summary: <br /> Sigmficant remedial activities have been completed at the site, bringing the TPHg and benzene <br /> ' concentrations to below laboratory reporting limits Low concentrations of TPHd, MTBE, and 1,2-DCA <br /> remain in the soil and groundwater below the site. Contamination from the site has impacted two <br /> domestic wells, which have been, or will be replaced with new, deeper domestic wells The cost of <br /> installation of the new domestic well at the 14852 S Hwy 99, is to be reimbursed by the SWRCB UST <br /> Cleanup Fund Fate and transport modeling suggests that contamination from the site will not impact the <br /> new on-site domestic well,or the proposed off-site domestic well within the 10 year period modeled <br /> The mass of contamination remaining in the soil and groundwater was calculated Calculations were <br /> ' based on the assumption that if a contaminant was not detected above the laboratory reporting limit, then <br /> it was assumed to have zero concentration The subsurface volume of impacted water was calculated, <br /> based on the groundwater sample concentrations Mass and volume calculations and contaminant <br /> ' concentrations appear to be small, and the fate and transport model suggests that an impact to the <br /> domestic wells is unlikely <br /> Based on the information reviewed, provided the data are accurate and representative of site conditions, <br /> concurrence with the SJCEHD determination for no further action appears appropriate <br /> 1 <br /> 1 <br /> I <br /> I <br />