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San Joaquin County
<br /> Environmental Health Department
<br /> DIRECTOR
<br /> r. �a ? 1868 East Hazelton Avenue \Donna Heran,REHS
<br /> �< Stockton, California 95205-6232 PR GRAM COORDINATORS
<br /> Robert McClellon,REHS
<br /> Jeff Carr esco,REHS,RDI
<br /> Kase
<br /> q<iFaac�` Website: www.sjgov.org/ehd YF�eyREHS
<br /> Phone: (209) 468-3420 Linda Tur ane,REHS
<br /> Fax: (209) 464-0138 Rodney E trade,REHS
<br /> Adrienne Ellsaesser, REHS
<br /> March 17, 2014
<br /> Hung Thanh Tran and Mary Kieu Nguyen
<br /> 6131 Pacific Avenue
<br /> Stockton, CA 95207
<br /> Subject: Shell Service Station
<br /> 6131 Pacific Avenue
<br /> Stockton, CA 95207
<br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed
<br /> Monitored Natural Attenuation Work Plan, dated 24 January 2014, and Groundwater Monitoring Report
<br /> - Third and Fourth Quarters 2013, dated 15 January 2014, prepared and submitted by your consulting
<br /> firm, Conestoga-Rovers ssooiates (CRA), on your behalf for the above-referenced site.
<br /> In Monitored—Natural Attenuation Work Plan, CRA proposed utilization of some of the existing
<br /> monitoring well network to monitor the effectiveness of natural attenuation for addressing the residual
<br /> gasoline constituents in groundwater. CRA will monitor and sample the monitoring wells on a
<br /> semiannual basis and continue the approved monitoring schedule program. In addition to the current
<br /> analytical suite, groundwater samples will be analyzed for dissolved oxygen (DO), oxidation-reduction
<br /> potential (ORP), alkalinity, nitrate, sulfate, methane, manganese, and ferrous iron, and carbon dioxide.
<br /> CRA will report field activities, the acquired groundwater monitoring data, and their natural attenuation
<br /> evaluation in a report of findings.
<br /> The EHD concurs with the proposed scope of work presented by CRA. If the proposed evaluation of
<br /> natural attenuation has favorable results, submit the findings in a Corrective Action Plan (CAP) for
<br /> remediating impacted groundwater.
<br /> In Groundwater Monitoring Report- Third and Fourth Quarters 2013, CRA proposed that monitor wells
<br /> / W-17 and MW-18 be sampled on a semiannual basis with the other site wells during the second and
<br /> fourth quarters. CRA proposes to begin the sampling during the second quarter of 2014. The EHD
<br /> approves the proposed sampling schedule presented by CRA. In addition, data for vapor extraction well
<br /> 45�$'�VM49L-6.Qwas omitted in the Groundwater Monitoring Report- Third and Fourth Quarters 2013 submit this
<br /> if`V data in future monitoring reports.
<br /> Please contact Angelica Sandoval Marin at (209) 468-2807 or amarin@sjcehd.com if you have any
<br /> CoA /g questions. �.
<br /> IWV'Y'�
<br /> Slnc r ly,
<br /> 1-
<br /> Angelica . Marin, REHS Nuel C. Henderson, Jr., PG
<br /> Senior Registered Environmental Health Specialist Engineering Geologist
<br /> C: Mr. James L. L. Barton, PG, CRWQCB, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670
<br /> Perry Pineda, Shell Oil Products US, 20945 S. Wilmington Blvd., Carson, CA 90810-1093
<br /> Larry Silva, CRA, 19449 Riverside Drive#230, Sonoma, CA 94576.
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