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San Joaquin County <br /> N. Environmental Health Department DIRECTOR <br /> �Q•_ .0 Donna Heran, RENS <br /> 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 <br /> ILI <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS,RDI <br /> Kasey Foley,REHS <br /> Website: www.sjgov.org/ehd Linda Turkatte, REHS <br /> Phone: (209) 468-3420 Rodney Estrada, REHS <br /> Fax: (209) 464-0138 Adrienne Ellsaesser, REHS <br /> October 11, 2013 <br /> Ms. Sharon Evans Mr. Chris Panaitescu <br /> Phillips 66 Company Thrifty Oil Company <br /> 1380 San Pablo Avenue 13116 Imperial Highway <br /> Rodeo, California 94572 Santa Fe Springs, California 90670 <br /> Subject: Phillips 66 Station No. 5449/former Thrifty Oil Company Site No. 172 <br /> 7647 Pacific Avenue RWQCB File No. 390652 <br /> Stockton, California 95207 SJCEHD Case No, 1227 <br /> Dear Ms. Evans and Mr. Panaitescu: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Additional Site Assessment Report (assessment report), and Quarterly Groundwater Monitoring <br /> Status Report Second Quarter 2013 (second quarter 2013 groundwater report), both dated 30 <br /> July 2013, and submitted by your consulting firm, Cardno ATC (Cardno), on your behalf for the <br /> above-referenced site. In the assessment report, Cardno presented analytical results and <br /> lithologic boring logs and cross sections from collecting soil samples during advancement of soil <br /> boring SB-1 and installation of monitoring wells MW-17 and MW-19 through MW-22; and <br /> analytical results from collecting soil gas samples from temporary soil vapor probes SV-1 <br /> through SV-5. <br /> Contrary to what is stated in Section 4.0 of the assessment report, SV-3 was advanced adjacent <br /> to the current 7-Eleven building and soil gas analytical results suggest a potential vapor <br /> intrusion risk. The benzene concentration of 70 micrograms per cubic meter (lag/m3) detected in <br /> soil vapor sample SV-3 exceeded the environmental screening level (ESL) of 42 lag/m3 for <br /> residential land use. <br /> Cardno recommends additional active remediation at the site based on: <br /> • "The dissolved-phase petroleum hydrocarbon concentrations observed at the site"; high <br /> concentrations of contaminants of concern were detected in groundwater samples <br /> collected on 24 and 25 June 2013 from MW-3, MW-13, MW-14 and MW-22 and reported <br /> in the second quarter 2013 groundwater report; <br /> • "Recent and historical soil analytical data"; significant concentrations of contaminants of <br /> concern were reported in soil samples collected in February 2012 during advancement <br /> of soil boring SB-1 and installation of MW-21 and MW-22, and high concentrations of <br /> contaminants of concern have been reported in historical soil data; and <br />