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T� SWV 11111���� <br /> Q ��PUBU SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL11FALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue,Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> QUL 19 200I <br /> ,TAMES GIOTTONINI <br /> PUBLIC WORKS DIRECTOR <br /> CITY OF STOCKTON <br /> 425 N EL DORADO <br /> STOCKTON CA 95202 <br /> RE: City of Stockton Sites in the Local Oversight Program <br /> A meeting was held on July 12, 2001 at the office of San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/ET-ID). In attendance at the meeting were you and Sharla <br /> Hardy,representing the City of Stockton; Bill Little representing Advanced GeoEnvironmental <br /> Incorporated (AGE); and Dot Lofstrom and Jeff Wong representing PHS/EHD. The following is <br /> a summary of the site discussions that occurred at the meeting as well as other comments. <br /> Fontana Drive at Smith Canal <br /> PHS/EHD has not received the report describing additional groundwater investigation at <br /> this site. Therefore, this site was not discussed further at the meeting. <br /> 110 Sonora <br /> The work plan for this site has been submitted and drilling permits issued. Monitoring <br /> well installation is scheduled to begin the third week of July. After the vapor extraction <br /> system is in place, the California Air Resources Board will inspect the system. Baseline <br /> sampling is scheduled for August. <br /> 1740 Houston <br /> The report on this site was issued in June 2001. Concentrations of methyl tertiary butyl <br /> ether(MtBE) detected in groundwater samples from monitoring well MW-6 have <br /> increased from 54 micrograms per liter(µg11) in November 2000 to 150 µg/l in June <br /> 2001. The screen for MW-6 is set at 35 to 40 feet below ground surface and thus <br /> represents the"deep"aquifer. In a discussion about possible closure for the site,the <br /> point was made by PHSIEHD that the vertical extent of contamination has not been <br /> defined and that additional work would probably be required. Subsequently,Jeff Wong <br /> discussed the site with the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB). The CVRWQCB agreed that further definition is required. Therefore, <br /> please submit a work plan to define the vertical extent of MtBE in groundwater at the site <br /> to PHSIEHD by July 31, 2001. <br /> 1465 Lincoln <br /> A concentration of perchloroethylene(PCE)was detected in samples collected from the <br /> soil associated with the piping of the abandoned waste oil underground storage tank. <br /> Therefore, at least one groundwater sample will need to be collected at the site to <br /> determine if groundwater has been impacted. Please submit a brief work plan to collect <br /> the groundwater sample(s)to PHS/EHD by July 31, 2001, <br /> A Division of San Joaquin County Health Care Services <br />