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CONDOR EARTH TECHNOLOGIES INC. o <br /> 188 Frank West C�ilple <br /> Suite I <br /> June 5, 2002 Stockton, CA 95206 <br /> (209) 234-0518 <br /> F <br /> Mr. Philip Isorena FAX (209) 234-0538 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3003 <br /> Re: Reduction of Analytical Requirements for Quarterly Groundwater Monitoring Program, <br /> Standby Generator Diesel Supply Line Site, <br /> Pilkington North America,Inc., <br /> 500 East Louise Avenue,Lathrop, California. San Joaquin County <br /> Dear Mr. Isorena: <br /> Thank you for taking the time to discuss the above referenced site in our telephone conversation on June <br /> 4, 2002. During our conversation, you requested that I prepare this letter to formalize our request for a <br /> reduction of the analytical requirements for quarterly monitoring at the facility. As we discussed, <br /> benzene, toluene, ethyl benzene, and total xylenes (BTEX) have never been detected at or above the <br /> laboratory reported detection limits in groundwater samples collected from the five monitored locations <br /> (three monitor wells MW-1 through MW-3 and two sumps SW-Sump and SE-Sump). Groundwater <br /> samples from the five monitoring locations have also been analyzed for total extractable petroleum <br /> hydrocarbons quantified as kerosene, diesel, and motor oil (TEPH). Based on the historical groundwater <br /> analytical results, Condor Earth Technologies, on behalf of Pilkington North America, Inc. (PNA), <br /> respectfully requests that the requirement for BTEX analyses be discontinued as a part of the quarterly <br /> groundwater monitoring program, and that samples continue to be analyzed for TEPH. <br /> Thank you for your attention to this project. If there are any questions, please call Mike Bowles, PNA <br /> Environmental Manager, at(209) 858-6202, or me at(209)234-0518. <br /> Respectfully submitted, <br /> Donald F. Kresse <br /> California Registered Geologist#6430 <br /> cc: Mr. Mike Bowles,Pilkington North America, Inc. <br /> Mr. John Keil,Pilkington North America,Inc. <br /> Ms. Margaret Lagorio, San Joaquin County PHS/EHD <br /> PA1838 LOF Diesel Line\Correspondence\AnalyticalReduction.doc <br /> ENVIRONMENTAL GEOLOGICAL ENGINEERING GEOTECHNICAL <br /> httn-11.. ,rnnrinroarth rnm <br />