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ConocoPhillips No. 5449/former Thrifty Oil Company No. 172 Page 2 of 2 <br /> 7647 Pacific Avenue October 11, 2013 <br /> Stockton, California 95207 <br /> "Vapor-phase petroleum hydrocarbon concentrations in shallow soil vapor samples SV-3 <br /> and SV-4"- significant concentrations of contaminants of concern were reported for soil <br /> gas samples SV-3 and SV-4 collected in February 2012. <br /> The EHD concurs with Cardno that additional remediation is necessary to address the impacted <br /> soil and groundwater contamination and reduce the soil gas concentrations at this site. The <br /> EHD directs that a Corrective Action Plan (CAP) be submitted to this agency by 15 January <br /> 2014 that will present a comparison of groundwater and soil remedial methods to determine the <br /> most cost effective remedial method to mitigate the petroleum hydrocarbon contaminants at this <br /> site. <br /> e be <br /> The EHD directs the following <br /> lment resons to ort and second gling uarter 201d31groundWt implemented eport:based on <br /> data submitted in thea p <br /> • Annually, during the second quarter of each year, collect and analyze groundwater <br /> samples from MW-7, MW-9, and MW-12R; <br /> • <br /> Semi-annually, during the <br /> second <br /> MW 3 MW- R MW-6, MW-13h MW-14 collect <br /> MWa15,MW-21 <br /> nd analyze <br /> groundwater sample from <br /> and MW-22; and <br /> Discontinue sampling MW-5, MW-16, MW-17, MW-19 and MW-20. <br /> Analyze all groundwater samples only for total petroleum hydrocarbons as gasoline (TPH-g); <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE) <br /> and tertiary-butyl alcohol (TBA). <br /> ical <br /> Please add the soil analytical res ults is andom aloadgthe slob anallyt cing al data for SB-1,rMW-17I <br /> analytical data tables submitted in report p <br /> MW-19 through MW-22, and soil gas Cont ti Board historical d t base. This is throuh SV-5, �n accal data from S cordance <br /> the California State Water Resources <br /> with chapter 30, division 3, title 23 of the California Code of Regulations. <br /> If you have any questions regarding this letter, please contact Vicki McCartney at (209) 468- <br /> 9852 or by email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Nuel C. Henderson, Jr., PG <br /> Victoria L. McCartney, REHS Engineering Geologist <br /> Senior Registered Environmental Health pecialist <br /> c: Ms. Gabe Stivala, PG, Cardno ATC, 701 University Avenue, Suite 200, Sacramento, <br /> California 95825 <br /> Mr. James L.L. Barton, PG, California RegionnalW C Cordova, Cal trollBogarr67Central Valley <br /> Region, 11020 Sun Center Drive, Suite ORancho <br />