Laserfiche WebLink
... .W <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> OG Donna Heron,RENS <br /> 1868 East Hazelton Avenue <br /> v: a PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> Website: www.sjgov.org/ehd Linda Turkatte, REHS <br /> 9CrFO R� Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> June 1, 2012 <br /> Mr. Denis L. Brown Mr. Michael A. Dominquez <br /> Shell Oil Products 2494 E. Fremont Street <br /> 20945 S. Wilmington Stockton, CA 95205 <br /> Carson, CA 90810-1039 <br /> Subject: Fremont Shell Station RO No.: 0251 <br /> 2494 E. Fremont Street APN: 15328008 <br /> Stockton, CA 95205 Global ID: T0607700736 <br /> Dear Messrs. Denis Brown and Michael Dominquez: <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site <br /> Investigation Report (SIR), Feasibility Study, and Corrective Action Plan (FS-CAP), dated 31 <br /> October 2011, prepared and submitted by your consulting firm, Conestoga-Rovers & Associates <br /> (CRA), on your behalf. In the SIR section, CRA presented analytical results [namely 1,2- <br /> dichloroethane (1,2-DCA) concentrations] from samples collected while advancing soil borings <br /> SB-30 through SB-32 onsite, and cone penetration test (CPT) borings CPT-33 through CPT-37 <br /> off-site. In the FS-CAP section, CRA compared various remedial alternatives: groundwater <br /> extraction, soil vapor extraction/air sparging, multi-phase extraction, in-situ chemical oxidation, <br /> enhanced in-situ biodegradation, and monitored natural attenuation (MNA) to determine the <br /> appropriate remedial method to mitigate impacted soil and groundwater at the above-referenced <br /> site. <br /> CRA concluded, based on site conditions, that MNA would be the most suitable and cost- <br /> effective remedial method to remove contaminants of concern mainly in the area of monitoring <br /> well, S-1. To evaluate the potential for natural attenuation, CRA proposes collecting additional <br /> analytical data that includes: dissolved oxygen concentrations, oxidation-reduction potential, <br /> alkalinity, and nitrate, sulfate and ferrous iron concentrations. <br /> The EHD approves the collection of MNA parameters as proposed by CRA. Please submit a <br /> work plan that addresses the proposed analyses, sample matrices, and proposed sample <br /> location. <br /> On 31 May 2012, the EHD posted public notification of pending Corrective Action Plan approval <br /> for remediation by MNA at this site. The public has thirty days to respond. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by email at <br /> vmccartney@sjcehd.com. <br />