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Fi opy <br /> PUBLIC HVALTH SERVICES <br /> Y., <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION 't <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> SCOTT KRALL JUN 15 2000 <br /> HEINZ USA <br /> P O BOX 57 <br /> PITTSBURG PA 15230-0057 <br /> RE: 757 E ELEVENTH ST SITE CODE: 1390 <br /> TRACY CA 95378-0057 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is the lead <br /> agency providing the oversight of the investigation and cleanup of releases from underground <br /> storage tanks (USTs)within San Joaquin County. #QHS/EHD has a contract with the California <br /> State Water Resources Control Board to conduct a UST corrective action program. The above <br /> referenced site was placed in the PHS/EHD Local Oversight Program (LOP) in October 1997. <br /> On August 29, 1997, PHSIEHD reviewed a Phase II Environmental Site Assessment Work Pian <br /> (WP) prepared by ERM and issued a permit to perform soil and groundwater sampling in the <br /> areas of two USTs previously closed in place. The soil and groundwater sample results from both <br /> UST areas evidenced gasoline contamination which required further soil and groundwater <br /> investigation and remediation. <br /> On October 14, 1997, PHS/EHD completed and filed an"Unauthorized Release Form"for the <br /> documented soil and groundwater contamination from the two USTs. A"Notice of Responsibility" <br /> dated October 21, 1997, was mailed to you as notification that the site had been assigned to the <br /> PHSIEHD LOP. <br /> Both of the former UST areas (Tank Site#1 and Tank Site#2)were overexcavated and <br /> dewatered subsequent to UST removal. Three monitoring wells (MWs) have been installed and <br /> monitored at each location. After performing a feasibility study, an oxygen release compound <br /> (ORC)was applied to the subsurface at Tank Site#1 and Tank Site#2 in ,lune of 1999. <br /> High concentrations of Total Petroleum Hydrocarbon Gasoline (TPH-Gas), Benzene, Toluene, <br /> Ethylbenzene, and Xylene (BTEX) remain in the groundwater down gradient of the source areas <br /> at both sites. The vertical extent of contamination in the groundwater at both sites has not been <br /> determined. The groundwater sample collected February 11, 1999 from HB-17 at 30 feet below <br /> ground surface at Site#1, contained 3,400 ppb TPH-Gas and some BTEX. The groundwater <br /> sample collected at the same depth on the same date from HB-20 at Site#2, contained 6,000 ppb <br /> TPH-Gas and some BTEX. These two areas need to be further assessed. MWs need to be <br /> installed with a screen interval from 30-35 feet below ground surface, developed and sampled at <br /> each site. if groundwater contamination is confirmed at these depths, further investigation may be <br /> required. <br /> A well receptor survey has been completed with no production wells identified on site. Please <br /> describe the survey method and provide a map that includes a 2000-foot radius from the UST <br /> locations. <br /> A Division of San Joaquin County Health Care Services <br />