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T ?� <br /> CONDOR EARTH TECHNOLOGIES INC. <br /> May 31,2000 <br /> 1125 N. Golden State Blvd. 188 Frank West Circle <br /> Suite G Suite I <br /> Turlock, CA 95381 Stockton, CA 95206 <br /> (209) 668-9234 (209) 234-0518 <br /> FAX(209) 668-9248 FAX (209) 234-0538 <br /> Mr. Philip Isorena <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3003 <br /> RE: Response to California Regional Water Quality Control Board (CRWQCB) Comments, <br /> Standby Generator Diesel Supply Line Site,Pilkington Libbey Owens Ford,500 East <br /> Louise Avenue,Lathrop,California, San Joaquin County <br /> Dear Mr. Isorena: <br /> Your letter to Mr. Jon Weiss of Pilkington Libbey Owens Ford (PLOF), dated May 11,2000, included <br /> five comments regarding the proposed actions at the above referenced site provided in the Report— <br /> Quarterly Groundwater Monitoring and Diesel Recovery,dated October 13, 1999,prepared by Condor <br /> Earth Technologies,Inc. (Condor). PLOF respectfully submits the following responses to your <br /> comments: <br /> 1. "MWs 1 and 3 are upgradient and MW 2 is cross gradient of the spill area. Therefore, <br /> downgradient wells are needed unless RWs 1,2,and 6 are used as MWs." PLOF agrees that <br /> down-gradient groundwater monitoring is necessary. PLOF believes that sufficient monitoring of <br /> down-gradient groundwater conditions is currently being conducted,however. <br /> Monitoring data indicate that the groundwater gradient at the site is probably the result of the sump <br /> pumping in the facility basement to the north of RW-2. The basement sumps,therefore, are located <br /> in an ideal position to monitor down-gradient groundwater at the site. Monitoring of the sumps has <br /> been proposed and is currently being conducted(please refer to the response to the third CRWQCB <br /> comment, on the next page). <br /> Monitoring data also indicate that RW-2 is down-gradient of the source area. Groundwater quality <br /> has been extensively monitored in that location(floating diesel product). Because of the floating <br /> diesel product, sampling of RW-2 for laboratory analyses of diesel constituents is not necessary or <br /> appropriate.Additional action proposed in this letter(please see the response to the second <br /> CRWQCB comment, on the next page) includes on-going diesel product measurements and <br /> skimming at RW-2. Continued monitoring of down-gradient groundwater at the location of RW-2, <br /> therefore, is anticipated. <br /> ENVIRONMENTAL GEOLOGICAL ENGINEERING GEOTECHNICAL <br /> http://www.condorearth.com <br />