SITE INFORMATION AND CORRESPONDENCE

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Three B's Truck Stop Page 2 of 2 14749 N. Thornton Road August 17, 2011 Lodi, California contamination encountered at this site. To better ascertain if contaminant vapor is present and posing a threat to the public or employees in the building, the EHD requires you to relocate two of the soil vapor probes closer to the building. The probes should be set at 5 feet below ground surface (bsg), the depth cited by most authoritative guidance documents and used for vapor intrusion modeling. The shallower proposed depth (three feet bsg) may be used if supported by an authoritative guidance document appropriate for site conditions. At least one soil vapor probe should be installed in the driveway just west of the building to detect any contaminant vapor that has migrated toward the building. Another soil vapor probe should be installed to 5' bgs near the southern entry of the building to ascertain if any contaminant vapor is present between the historically contaminated dispenser islands to the south and the building. The EHD approves the location for proposed confirmation borings P-19, P-20, and P-21 for soil sample collection. The plan will be considered adequate and necessary with the above noted concerns properly addressed [H&S 25296.10(c)(3)]; if you concur you may proceed, otherwise submit a revised work plan with technical justification for an alternative investigation design that addresses the concerns noted above. Please submit a revised map showing the location of the soil vapor probes and a probe construction schematic. In addition, the Test is approved as necessary and adequate. The fee for an EHD permit for soil vapor probes (installation and removal the same day) is $500. If you plan to install soil vapor wells (probes that remain in beyond the day they were installed are considered a well), the application and inspection fee for an EHD permit is $375 plus $125 per each vapor well. Vapor probes to be left in place beyond the day they are installed (wells) must have a watertight surface seal, a locking cap for the casing, and a traffic box installed. The removal of these wells requires an EHD permit and fees equal to those of the installation. You may contact Michael Infurna, Senior REHS at (209) 468-3454 if you have any questions or wish to di s the site. Michael J. Infurna Jr., REHS Nuel C. Henderson Jr., PG Senior Registered Environmental Health Specialist Engineering Geologist cc: Mr. James L. Barton, CVRWQCB, Underground Storage Tank Unit, 11020 Sun Center Drive, #200, Rancho Cordova, CA 95670-6114 Mr. Kirk Larson, Underground Storage Tank Cleanup Fund, State Water Resources Control Board, P.O. Box 944212, Sacramento, CA 94244-2120 Mr. Tim Cuellar, AGE, 837 Shaw Rd., Stockton, CA 95215 14749 Thornton Final SV & Conf-SB WP CML 5-17-11