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Former Cheaper Store Number 37 Page 2 <br /> 15 East Grant Line Road April 16, 2010 <br /> Tracy, California 95376-2720 <br /> The EHD does not believe it is necessary to collect additional soil samples at this time, but <br /> an estimate of the contaminate mass in soil and groundwater should be prepared. The <br /> EHD directs that an evaluation of groundwater elevations to groundwater concentrations of <br /> chemicals of concern be performed: If the findings for the vapor intrusion evaluation and <br /> the comparison of groundwater gradient to groundwater contaminant concentrations are <br /> favorable, the report can be submitted as part of a site closure summary report. Fully <br /> address all items in the Tri-Regional Guidance Appendix-B for closure and include residual <br /> contaminant mass estimates and an estimate as to when the petroleum hydrocarbon <br /> contaminant concentrations will return to background conditions. <br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) <br /> 468-9852, or by e-mail at vmccartney(a-)_sicehd.com. <br /> Sincerely, <br /> (�r - � �. <br /> "U <br /> Victoria <br /> L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Nathan Christman, PG, ATC Associates Incorporated, 1117 Lone Palm Avenue, <br /> Suite 201, Modesto, California 95351 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />