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San Joaquin County <br /> DIRECTOR <br /> oP... �� Environmental Health Department <br /> Donna Heron, REHS <br /> Q � 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 1 Robert McClellon, REHS <br /> .. Jeff Carruesco,REHS, RDI <br /> c4 F O R Nuc Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> Phone: (209)468-3420 Linda Turkatte, REHS <br /> Fax: (209) 464-0138 <br /> February 7, 2011 <br /> Wayne Henry <br /> Fremont Gate LLC <br /> PO Box 5221 <br /> Modesto, CA 95355 <br /> Subject: United Rentals <br /> 2911 East Fremont Street <br /> Stockton, CA 95202 <br /> Dear Mr. Henry, <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Summary Report (Report), dated January 19, 2011, that was prepared on your behalf <br /> by Lee & Pierce, Inc. and has the following comments. <br /> The Report documents a site investigation conducted at the subject site, address <br /> 2911 Fremont Street, Stockton, CA, in October 2010. Four soil borings were advanced <br /> on site to investigate the vertical and lateral extent of petroleum hydrocarbon <br /> contamination to both soil and groundwater surrounding an inactive subsurface clarifier <br /> and wash drains. The contamination was found when soil borings were advanced next <br /> to the clarifier in April 2010. <br /> Analytical results presented in the Report indicate that the extent of contaminant <br /> impact to soil appears to be vertically and laterally defined, and that it is not related to <br /> the former underground storage tanks that were removed from the site in 1992. The <br /> four grab groundwater samples each had detections of tetrachloroethene reported at <br /> concentrations below the maximum contaminant level. No other constituents analyzed <br /> for were reported in the groundwater. <br /> In the Report Lee & Pierce estimates that approximately 650 gallons of residual <br /> contamination remain in the soil beneath the clarifier, and recommends two options for <br /> dealing with it: conducting a risk assessment to determine the potential threat of <br /> leaving the contamination in place, or evaluating different options for conducting active <br /> remediation. The EHD agrees these options are both viable. <br /> If you wish to proceed by conducting a risk assessment, please submit a <br /> comprehensive report evaluating the potential risk posed by the remaining <br /> contamination to human health and the environment via all potential routes of <br />