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ENVIRONMENTAL HEALTH DEPARTMENT <br /> /T._ .c <br /> ° SAN JOAQUIN COUNTY <br /> G Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Bergman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> • L -` '• Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> • cq. .— .��P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> <<FOR Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-01.38 <br /> Mark Barcellos,R.E.H.S. <br /> 7-ELEVEN INC COPY <br /> KEN HILLIARD <br /> PO BOX 711 DALLAS TX 75221-0711 !Z4R <br /> RE: 7-Eleven Store #14117 Site Code:1073 <br /> 2725 Country Club Blvd. LOP-RO#:0000013 <br /> Stockton, CA., 95204 <br /> WORK PLAN: "Work Plan for Interim Remediation and Oxygen <br /> Injection Feasibility Test." <br /> DATED: April 19, 2004 <br /> PREPARED BY: Secor International Inc. — Jaff Auchterlonie <br /> STATUS: APPROVED, with conditions noted below. <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN fH&S <br /> 25296.10(c)(3)1: <br /> • In response to EHD recommendation to incorporate `interim' <br /> remedial action to control TBA plume migration, this proposal <br /> includes ground water extraction from existing monitoring wells <br /> (MW-1, MW-2, & MW-4) "at lease once a month" and, <br /> • Install three (3) oxygen injection test wells and conduct 100% oxygen <br /> injection for the purpose of "enhancing in-situ biodegradation of the <br /> residual hydrocarbons in soil and ground water." <br /> • Collect ground water samples from the monitoring well prior to <br /> ground water extraction and analyze for TPH-g, BTEX, MtBE, other <br /> oxygenates (TBA, DIPE, ETBE, TAME) and <br /> • Submit report of findings to EHD. <br /> COMMENTS AND CONDITIONS: <br /> EHD considers `monthly' ground water extraction to be inadequate <br /> as a ground water migration control. Southland should reevaluate <br /> the local site hydrogeology to determine what pumping rates are <br /> necessary by ground water extraction to adequately slow/halt the <br /> offsite migration of petroleum. <br /> FILE <br /> C <br />