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r.► T <br /> E <br /> ;. <br /> � G <br /> ,�^,T P" 1>C��rate Office: <br /> .,, i 5 �� � <br /> 21663 Brian Lane, P.O. Box 3905 <br /> CONDOR EARTH TECHNOLOGIES INC. Sonora, 95370 <br /> (209)5322--0361 - FAX(209) 532-0773 <br /> 5651 N. Pershing Avenue, Suite C-3 <br /> October 12, 1995 Stockton, CA 95207 <br /> (209) 474-1492 • FAX (209) 478-1716 <br /> Ms. Wendy Cohen <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> Attn: Ms. Polly Lowry - Associate Engineering Geologist <br /> RE: GROUND WATER INVESTIGATION AND CHLOROFORM PLUME <br /> CONTAINMENT <br /> TRIPLE E PRODUCE, TRACY, SAN JOAQUIN COUNTY <br /> in your letter of September 19, 1995, you gave approval of the Revised Work Plan and <br /> Evaluation of Alternatives for Containment of the Chloroform Plunge in Ground Water, July <br /> 12, 1995 (Revised Work Plan) for containment of the chloroform plume. Your letter also <br /> requested Triple E Produce to provide additional information for several related items. <br /> With respect to the estimated cost of extracting ground water from monitoring well MW-7, a <br /> separate letter will be forthcoming from Mr. Nate Esformes of Triple E. On the remaining <br /> items, Condor Earth Technologies, inc. (Condor) is pleased to respond in behalf of Triple E. <br /> 1. MW-7 Capture Zone Maps <br /> Maps of the computer-simulated capture zone from pumping 20 gpm at XW-1 and 5 gpm at <br /> MW-4A appear on Figure 2 and figure 5 in the Revised Work Plan. These figures are also <br /> enclosed Dere,and have been further annotated to clearly show the location of MW-7 inside <br /> the capture zone predicted by the modeling. The simulation assumed: <br /> 1. a homogeneous, isotropic hydraulic conductivity field with a value of 4.32 <br /> ft/day derived from a former pump test at the site. <br /> 2. pumping from the wells as described above, and <br /> 3. recharge to the aeration pond of 17 gpm. <br /> ENVIRONMENTAL GEOLOGICAL ENGINEERING GEOTECHNICAL <br />