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FILE COPY <br /> PUBLIC HtALTH SERVICTS <br /> SAN JOAQUIN COUNTY r' Z <br /> Q: <br /> N: <br /> ENVIRONMENTAL HEALTH DIVISION . <br /> Karen Furst, M.D., M.P.H., Health Officer ogriFoaa P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> AUG 0 3 2000 <br /> ELROY COX/ COX&COX <br /> PO BOX 1046 <br /> TRACY CA 95376 <br /> RE: Ed's Muffler Shop Site Code: 1933 <br /> 595 E. 11`h Street RON 000213 <br /> Tracy, CA.,95736 <br /> San Joaquin County Public Health Services,Environmental Health Division (PHS-EHD) <br /> has received a request from Wright Environmental Services for clarification on required <br /> laboratory analyses for soil and groundwater samples. <br /> On January 19, 1990,four-(4) gasoline underground storage tanks (UST) and one (1) 1,000 <br /> gallon waste oil UST were removed from this site. Each gasoline LIST and the waste oil <br /> LIST had two samples taken from the soil below each end of the UST at approximately 10 <br /> feet below grade surface ( bgs). Groundwater entered the excavations and a grab water <br /> sample was taken from the gasoline pit. No groundwater sample was collected from the <br /> waste oil excavation. <br /> Elevated levels of petroleum were detected in all soil samples and the one groundwater grab <br /> sample. The vertical extent of the petroleum impact to the soil in the pits has yet to be <br /> determined. <br /> PHS-EHD is now requiring the responsible parry for this site to delineate the vertical extent <br /> of the petroleum impact to the soil and the source of the contamination that continues to <br /> impact the groundwater around MW-3 and MW-9. The most recent investigation on April <br /> 25, 2000 revealed that the soil in the area of the former UST pits is still discolored and has <br /> petroleum odor from depths just above and into the saturated zone. <br /> PHS-EHD has requested that EPA Method 8010/601 be utilized on soil and groundwater <br /> samples collected during the last phase and future phases of investigation.The LUFT <br /> Manual and the Tri-Regional Board Staff Recommendations discuss analysis for chlorinated <br /> solvents when investigating waste oil contamination. <br /> Although EPA Method 8010 for the soil samples at the waste oil UST removal indicated that <br /> no constituents were detected,groundwater in the excavation was not sampled and analyzed. <br /> Because of the chemical nature of the solvents (DNAPL),further testing is required. <br /> PIS-EHD has directed this site to include EPA Method 8010/601 analysis for some of the <br /> soil and all groundwater samples collected most recently and in the future. P1S-EHD will <br /> evaluate the findings of the continuing subsurface investigations and determine if EPA <br /> Method 8010 /601 is to be continued. <br /> A Division of San Joaquin County Health Care Services <br />