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OL F R ENVIRONMENTAL MANAGEMENT&CONSULTING ENGINEERING September 8, 2008 003-09366-01 Mr. Roberto Cervantes Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, California 95670 Subject: Proposed Sampling and Analysis Plan, C&S One Hour Martinizing, Robinhood Plaza Shopping Center, Stockton, California Dear Mr. Cervantes: LFR Inc. (LFR) recently completed a soil gas investigation at the C&S One Hour Martinizing facility located in the Robinhood Plaza Shopping Center at 5756 Pacific Avenue in Stockton, San Joaquin County, California ("the Site"). The results of the investigation and recommendations for additional work at the Site were presented in our report entitled "Soil Gas Investigation Report, C&S One Hour Martinizing, Robinhood Plaza Shopping Center, Stockton, California," dated June 18, 2008 ("the Report"). The purpose of this letter is to document the results of a utility survey and present the proposed sampling locations, depths, and analytical methods for the next phase of investigation at the Site. Background Analysis of the soil-gas samples collected during previous investigations by LFR at the Site revealed the presence of tetrachloroethene (PCE) in shallow soil gas at concentrations that exceed Tier I screening levels (California Human Health Screening Levels [CHHSLs]). Results of a qualitative evaluation of the data collected during these investigations indicate that the concentration of PCE detected does not represent a likely threat to human health risk or underlying groundwater quality. However, LFR recommended additional investigation to confirm this evaluation with field data. As presented in Section 5.1 of the Report and discussed during our September 4, 2008 telephone conference call with you and Mr. Duncan Austin of the Central Valley Regional Water Quality Control Board, LFR proposes to collect soil and groundwater samples from three locations along the sanitary sewer pipeline that serves the building housing C&S One Hour Martinizing ("the subject building"). Utility Survey Maps showing the locations of existing underground utilities serving the Site were provided to LFR by the property management company for the Robinhood Plaza Shopping Center. On September 8, 2008, LFR's representative met a private utility locator at the Site to confirm the locations of the underground utilities, including the sanitary sewer pipeline within the footprint of the subject building. 916.786.0320 m 916.786.0366 IF 4190 Douglas Boulevard,Suite 200 www.lfr.com Granite Bay,California 9 57 46-5964 Offices Nationwide