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Grand Auto#4025 page 2 1210 TiacyBlvd,Tracy. As long as the requesting partycontinues to followthe recomrrnrrdations issued byPHS-EHD,our involvement with the site will continue. When recommendations are not followed,PHS-EHD will refer the site to either the Central ValleyRegional Water Quality Control Board(CVRWQCB)or the California Department of Toxic Substances Cn.ntrol(DTSO for further investigation In the past,PHS-EHD has issued"No Further Investigation"M letters to norrLJST requesting parties when it has been determined that the groundwater beneath the site was not irnpacted byconstir cents of concern and the soil contarnination was vetylow or non-detect at acceptable detection limits and was laterallyand verticallyclefined. PHS-EHD will provide a NFI letter onlyurrder these same conditions. If the groundwater is contaminated or the soil impact is not laterallyyorverticallydefined,PHS-EHD wE recommend areas for further investigation Once the soil contamination has been delineated and the impact to the groundwater verified,PHS-EHD will evahrate your site for either referral or NFI. Based on the information in the reports recentlysubmitted to PHS-EHD,our recommendation would be to include additional soil sampling to depths where two consecutive five-foot samples indicated`non-detect'for the constituents of concern. Groundwater samples should be collected also and analyzed for all constituents the soil is to be analyzed for. Detection limits and QualiryAssurance/QualiryCn.nirol(QA/QC)measures should be consistent with protocols typrallyutilized in LIST investigations. Hydraulic oil,waste oil,ethylene-glycol,chlorinated solvents,lubricants,and batteryacid should be investigated in areas where the Phase I Report indicated theywere stored,used,or stained the area Anydetectable contamination should be laterallyand verucallyinvestigated and defined. Delineation conclusions in reports should be based on acceptable data (good QA/QC;detection limits,chain of custody,etc)that supports these conclusions. The area of the above ground storage tanlis(AGI)is uriclear. Narrative corrunents indicate two AGTs were stored and uutrlized in the"area adjacent to the northwest comer of the building,")et the maps included in the reports show the AGTs at the northeast area of the site. This discrepancy needs to be clewed up. Soil and groundwater samples should be collected and analyzed for waste oil LIST protocols in the AGT area The area of the three clumbered oil/water separator should be investigated for waste oil LIST constituents also in soil and groundwater samples. The four(4)floor drains should have the soil beneath them investigated and samples analyzed for all constituents detected in the investigation corxI:ucted around and under the separator. The replaced hydraulic lift and the soil around it should be investigated for hydraulic oil If contamination is detected,it should be delineated and a groundwater investigation should be conducted there. The impact of contarnination to the soil in the lead-acid batterystorage area needs to be verified. Soluble lead and the conositivityof the soil in this area should be ascertained. Anysoil contamination in this area will require a groundwater investigation for lead and pH During the ramal Phase II investigation,PHS-EHD staff noted deep standing water witlr floating product and sheen in the truck loading dock at the east side of the building. Soil samples are to be collected in this area and analyzed for petroleum,solvents,and anyotherconstituent evidenced byresidual traces on the surface. If soil contamination is detected,a groundwater investigation should be conducted for constituents found in the soil