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0 " • , 0 <br /> WLFR ENVIRONMENTAL MANAGEMENT&CONSULTING ENGINEERING <br /> June 18, 2008 003-09366-01 <br /> Mr. Roberto Cervantes <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670 <br /> Subject: Soil Gas Investigation Report, C&S One Hour Martinizing, Robinhood Plaza <br /> Shopping Center, Stockton, California <br /> Dear Mr. Cervantes: <br /> LFR Inc. (LFR) is pleased to present the attached report for the soil gas investigation at the <br /> C&S One Hour Martinizing facility located in the Robinhood Plaza Shopping Center at 5756 <br /> Pacific Avenue in Stockton, San Joaquin County, California ("the Site"). Investigative tasks <br /> included collecting and analyzing a total of 15 soil-gas samples from the Site during two <br /> sampling events. During the initial sampling event, soil-gas samples were collected at a depth <br /> of approximately 5 feet below the ground surface (bgs) from three temporary borings. Based <br /> on the results of that initial phase of investigation, a second phase of investigation was <br /> conducted that included the collection of soil-gas samples from a depth of approximately 5 <br /> feet bgs from two temporary borings located outside the dry-cleaning facility, and from 10 soil <br /> gas wells (five sub-slab wells and five 5-foot wells) constructed inside the dry-cleaning <br /> facility. <br /> Analysis of the soil-gas samples revealed the presence of tetrachloroethene (PCE) in shallow <br /> soil gas at concentrations that exceed Tier I screening levels (California Human Health <br /> Screening Levels [CHHSLs]). Results of a qualitative evaluation of the data collected during <br /> this investigation indicate that the concentration of PCE detected does not represent a likely <br /> threat to human health risk or underlying groundwater quality. However, additional <br /> investigation is recommended in order to confirm this evaluation with field data and to fully <br /> address the detections of PCE above the CHHSL. <br /> If you have any questions concerning this report, please call us at (916) 786-2456. <br /> Sincerely, <br /> 9�� <br /> J. Scott Seyfried, P.G., C.HG. <br /> Principal Hydrogeologist <br /> Enclosure <br /> 916.786.0320 m <br /> 916.786.0366 f <br /> 4190 Douglas Boulevard,Suite 200 www.ltr.com <br /> Granite Bay, California 95746-5964 <br /> Offices Nationwide <br />