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San Joaquin County .� Environmental Health Department DIRECTOR ? == f Donna Heran,REHS 1868 East Hazelton Avenue W: �� ;< Stockton, California 95205-6232 PROGRAM COORDINATORS LJI�CL r Robert McClellon, REHS Jeff Carruesco,REHS, RDI c•.• P Kasey Foley,REHS q<<F�R�\ Website: wwwsjgov.org/ehd Linda Turk tte, REHS Phone: (209)468-3420 Rodney Estrada,REHS Fax: (209) 464-0138 Adrienne Ellsaesser,REHS January 24, 2014 Mr. Mark Lill General Manager Williams Tank Lines, Inc. 1477 Tillie Lewis Dr. Stockton, CA 95206 Subject: Petroleum Tanker Spill Cleanup at 22934 E. Mariposa Rd., Escalon, CA No Further Action Required Dear Mr. Lill The San Joaquin County Environmental Health Department (EHD) Site Mitigation Unit has received and reviewed Petroleum Tanker Spill Response, Soil Excavation, and Confirmation Soil Sampling Results Report (Response Report), dated 28 October 2013, prepared by Apex Envirotech, Ind. (Apex). The Response Report provides a description of the accidental unauthorized release of approximately 8,000 gallons of gasoline on the roadside at the referenced address, the investigation of the extent of the subsurface impact and the mitigation of the impacted soil media. The unauthorized release occurred on 31 August 2013 as the result of a traffic accident in which one vehicle, a Williams Tank Lines, Inc. fuel tank truck, released 8,000 gallons of gasoline, much of which was burned before entering the subsurface along the shoulder of the road. To investigate the subsurface impact, Apex advanced six soil borings to continuously collect soil; the collected soil samples were screened utilizing a photo ionization detector (PID) and were described. Selected soil samples from 4 feet below surface grade (bsg) or 15 feet bsg were submitted for laboratory analysis. The submitted soil samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPHg), benzene, toluene, ethylbenzene and total xylenes (BTEX), and fuel oxygenates, including methyl tert-butyl ether (MTBE). The maximum concentrations of each analyte detected were 5.4 milligrams per kilogram (mg/kg) TPHg, 0.025 mg/kg benzene, 0.33 mg/kg toluene, 0.22 mg/kg ethylbenzene, and 0.91 mg/kg total xylenes. These concentrations are well below the environmental screening levels (ESLs) established by the San Francisco Bay Regional Water Quality Control Board for residential property and below the benzene and ethylbenzene concentrations listed in the California State Water Resources Control Board (SWRCB)-recently adopted Low-threat Underground Storage Tank Closure Policy for vapor intrusion and direct contact and exposure to outdoor air hazard/risks. The data delineated the extent of impacted soil that required mediation.