SITE INFORMATION AND CORRESPONDENCE FILE 2

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i Steve&Gene's Service Page 2 of 2 2315 N. EI Dorado Street October 27,2008 Stockton, CA "shallow" and "intermediate" to correspond with those screen intervals. GTI notes in the WP that data from this investigation will be used develop an updated SCM, which will include contaminant distribution, both vertically and laterally, and which will be used to calculate a mass estimate. The SCM should include a set of cross-sections with at least one cross-section along the inferred plume axis and.two or three transverse to the plume axis showing lithology and contaminant concentrations between Castle Motors and the Shell site. Additionally, GTI proposes investigating soil vapor intrusion potential though analysis of existing data sets from wells that are in closest proximity to the existing inhabited buildings, combined with new data that will be gathered from this investigation. The EHD approves the data,analysis, but may require collection and analysis of soil gas samples at later time. The EHD approves the revised WP. Submit to the EHD a well permit application and $89.00 permit fee, and $315.00 inspection fee for each parcel drilled and encroachment permit for the boring(s) in the public right of way. Once the well permits have been approved, notify the EHD of the proposed schedule.for the work. The EHD requires.a minimum 48-hour notice prior to initiation of any field work on the'site. The EHD directs that the proposed work be implemented by January 23, 2008. If you have any questions, please contact Frank Girardi, Senior Registered Environmental Health Specialist at(209)953-7868. Frank Girardi, REHS Nuel C. Henderson, Jr., PG Senior Registered Environmental Health Specialist Engineering Geologist c: James Barton—CVRWQCB,11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 Ray Kablanow,PG—Geological Technics Inc., 1101 Seventh St., Modesto, CA 95354 081027wpa