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PUBLIC HEALTH SERtICES OP4u!N C <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P H <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> Cc <br /> \ % U U <br /> DON ROEK <br /> ROEK BROTHERS CONSTRUCTION <br /> 3736 S HWY 99 DEC 0 71991 <br /> STOCKTON CA 95213 <br /> RE: 102 S. Wilson Way SITE CODE: 9031 <br /> Stockton, Ca <br /> Your site was recently presented to San Joaquin County Public <br /> Health Services, Environmental Health Division' s (PHS/EHD) <br /> Technical Review Committee (TRC) and to representatives of the <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) . <br /> This letter is to appraise you of the conclusions reached by the <br /> committee and the CVRWQCB. <br /> The TRC and the CVRWQCB resolved that the data does not <br /> conclusively suggest that the groundwater contamination plume is <br /> solely from an off-site source and that a more thorough <br /> investigation of the former tank pit area and piping areas <br /> extending to the former dispensers is warranted. <br /> The groundwater data collected to date shows the highest <br /> concentrations of contaminants in monitoring wells #2 and #5, <br /> located generally downgradient from the former tank pit area and <br /> dispensers. Lower concentrations were found in monitoring wells <br /> #1 and #6, located at or near the former dispensers in the <br /> generally upgradient direction from the former tank pit area and <br /> piping. This data does not suggest that a contaminant plume is <br /> migrating from the suspected off-site source across the street. <br /> The committee agreed that the removal of the contaminated soil <br /> identified in the northwest corner of the site is appropriate and <br /> warranted to abate this continued threat to groundwater. <br /> The groundwater contamination plume still needs to be fully <br /> defined downgradient. Additional monitoring wells will need to <br /> be installed to replace those wells that are now dry. <br /> Remediation alternatives should be explored to mitigate the <br /> contamination in the groundwater and to prevent the further <br /> migration of the plume off-site. <br /> A Division of San Joaquin County Heahh rare S mco <br />