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ARCADIS ARCADIS U.S.,Inc <br /> 950 Glenn Dnve <br /> Suite 125 <br /> Folsom <br /> Califomia 95630 <br /> MEMO Tel 916.985.2079 <br /> To: Coples: Fax 916.985.2093 <br /> Mr. James L.L. Barton, P.G. Stephanie McKenna, Chevron EMC <br /> Engineering Geologist James Eisert,ARCADIS <br /> Kelly Houston, ARCADIS <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health <br /> Department <br /> From: <br /> Tonya Myers <br /> Date: ARCADIS Project No.: <br /> October 10, 2011 80046957.0002 <br /> Subject <br /> Chevron Site ID 306415—Site Summary <br /> ARCADIS, U.S, Inc. (on behalf of Chevron) began implementing the work proposed in the Enhanced <br /> Biological Oxidation Pilot Study Workplan for Chevron Site ID 306415 located at 437 East Miner Avenue <br /> in Stockton, California during December 2010. Pilot study activities completed to date include installing 12 <br /> injection wells and 4 dose response monitoring wells, collecting baseline samples, conducting one <br /> injection event,and conducting two rounds of post injection monitoring. <br /> Background <br /> The 12 injections wells and four dose response wells were installed in December 2010 and January 2011, <br /> including wells in each hydrostratigraphic unit(A,A', B, B'). Figure 1 depicts the location of the newly <br /> installed wells. Baseline results are included with post-injection results in Attachment 1. <br /> During the initial injection event, approximately 36,800 gallons of injection solution,with an average <br /> concentration of 5 grams per liter(g/L)sulfate and 36 milligrams per liter(mg/L)fluorescein tracer,were <br /> injected. These injections were coupled with real-time dose response monitoring in each of the <br /> hydrostratigraphic units(at the respective dose response wells[U-1, U-27A, U-27A', U-2713, and U-27B']) <br /> to confirm delivery of solution at the targeted injection intervals and radii. <br /> Attachment 1 and Tables 1.1 through 1.5 provide detailed baseline-and post-injection results at each of <br /> the dose response wells: <br /> Page: <br /> y: amuaatsnz om�m�ommewmem®m,a�me,�cbMs,mmaya08ats gm s,m„en�+0102011.ao< 1/4 <br />