SITE INFORMATION AND CORRESPONDENCE FILE 2

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• a `moi Former Chevron Service Station 9-0557 Page 2 of 2 139 South Center Street April 30, 2013 Stockton, California At the request of Chevron and HFA, the EHD has reviewed this site for low-threat closure by completing a LTCP checklist, although only the California State Water Resources Control Board personnel can complete the form on GeoTracker. The only difference between the checklist presented in the report by HFA and the checklist completed by the EHD is in section 3.0 — "Direct Contact and Outdoor Air Exposure". The EHD responded 'Yes"to the question: a. Are maximum concentrations of petroleum constituents in soil less than or equal to those listed in Table 1 for the specified depth below ground surface (bgs)? The EHD has reviewed historical soil concentrations of benzene and ethylbenzene at depths between the ground surface and ten feet bsg and has compared the data to commercial/industrial concentrations listed in Table 1 of the LTCP checklist. The EHD could find no soil concentrations for benzene and ethylbenzene that exceeded the concentrations listed in Table 1. The EHD would also respond with an 'NA'to the question: c. As a result of controlling exposure through the use of mitigation measures or through the use of institutional or engineering controls, has the regulatory agency determined that the concentrations of petroleum constituents in soil will have no significant risk of adversely affecting human health? Please address the bulleted items presented above. Submit your response to the EHD within 30 days of the date of this letter. If you have any questions or concerns regarding this letter, please contact Vicki McCartney at (209)468-9852, or by email at vmccartney@sjcehd.com. Sincerely, Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG Senior Registered Environmental Health Specialist Engineering Geologist c: Dr. Steven H. Edelman, CHG, PG, Holguin, Fahan & Associates, Inc., 1000 New York Street, Suite 101, Redlands, California 92374 Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 Mr. Joe Mulligan, Supervising Real Property Agent, Economic Development Department, City of Stockton, 425 North EI Dorado Street, Third Floor, Stockton, California, 95202-1997 Greyhound Bus Lines, Post Office Box 660362, Dallas, Texas 75266-0362