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PUBLIC r1EALTH SERN7-010ES a�,N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor Stockton, CA 95202 <br /> 209/468-3420 / ` ✓� <br /> u <br /> JOHN JOHNSON <br /> THE CUSTOMER COMPANY <br /> P O BOX 886 FOAR 17 •1997 <br /> BENECIA CA 94510 <br /> RE: CHEAPER STORE #37 SITE CODE: 1404 <br /> 15 E GRANT LINE ROAD <br /> TRACY CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> has recently completed a review of the file for the above noted site and offers the <br /> following comments for your consideration. <br /> The first phase of an investigation at the former gasoline station located across the <br /> street to the west of this site has been completed. The results indicate that the release <br /> of petroleum from the underground storage tanks formerly located at 2421 Holly Drive <br /> are not likely the source of, or a contributor to, the elevated levels of hydrocarbons <br /> observed in monitoring well MW#4 at this site. <br /> The data collected at this site to date indicate a groundwater contaminant plume <br /> localized around the tank pit area, predominantly in the backfill area of the underground <br /> storage tanks. There have been discussions in the past with your consultants that <br /> monitoring well MW#4 may possibly be hydraulically connected to the tank pit backfill. <br /> The data from the site also indicate a slow leaching from this impacted core area into <br /> the surrounding soil and groundwater, laterally in the capillary fringe zone. Unless the <br /> core area of contamination is abated, this leaching will continue to occur over time. <br /> Therefore, alternatives to reduce the contamination in the tank pit area should be <br /> evaluated for effectiveness and cost. The most cost effective alternative should be <br /> selected and ultimately implemented at this site. Once the core area contaminant <br /> concentrations are reduced, this site will likely be a good candidate for a low risk <br /> closure. Please conduct the above noted evaluation and submit to PHS-EHD for <br /> review. Please also include a proposed time schedule for implementation. <br /> A Division of San Joaquin County Health Care Services <br />