SITE INFORMATION AND CORRESPONDENCE FILE 2

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i San Joaquin County OP�' u ! N .0 Environmental Health Department DIRECTOR Donna Heran, REHS 1868 East Hazelton Avenue Stockton , California 95205-6232 PROGRAM COORDINATORS Robert McClellon, REHS - Jeff Carruesco, REHS, RDI C+ • . , � ,. P Kasey Foley, REHS Ci k 8 a �, Website: wwwsfgov.org/ehd Linda Turkatte, REHS Phone: (209) 468-3420 Fax: (209) 464.0138 April 16, 2013 Mr. Steve Beneto Beneto, Inc. 4080 Seaport Boulevard West Sacramento, California 95691 -3417 Subject: Former Beneto Facility 749 East Charter Way Stockton, CA 95202 Dear Mr. Beneto: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Dual Phase Extraction Pilot Test Results Report (report), dated 04 September 2012, submitted by your consulting firm , Apex Envirotech , Inc. (Apex) , on your behalf for the above-referenced site. The EHD had approved a work plan to conduct a dual-phase extraction (DPE) pilot test by letter dated 13 April 2012. In the report, Apex presented results from completing a ninety-six-hour DPE test on monitoring wells MW-1 and MW-5 over a five-day period and concluded that DPE would be effective at controlling and removing petroleum hydrocarbon contaminants at the site. Although Apex was not able to determine the vapor extraction radius of influence (ROI) since the "vacuum response versus distance from the vacuum source was not plotted as all figures were inconclusive" , Apex did estimate that approximately 22 . 1 pounds of total petroleum hydrocarbons as gasoline (TPHg) , 2.64 pounds of benzene and 0. 01 pounds of methyl tertiary-butyl ether (MTBE) were removed from the subsurface by soil vapor extraction during the pilot test. Apex determined the ROI from groundwater extraction was greater than 180 feet and estimated that approximately 2.7 pounds of TPHg , 0. 34 pounds of benzene and 0. 01 pounds of MTBE were removed during the DPE test. Based on these results, Apex has recommended the preparation of a Remedial Action Plan (RAP) , proposing DPE as the remedial method to remove contaminants of concern at this site. Based on the conclusions and recommendations of your consultant, the EHD approves preparation and submittal of a RAP to this agency that includes a comparison of several other remediation technologies to DPE . Please include a cost estimate for implementing each remedial method to determine the most cost-effective method for removing petroleum hydrocarbon contaminants based on site specific data and cost effectiveness. Submit the feasibility study to the EHD by 17 June 2013.