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1444 MARIPOSA <br /> WKA No. 293 8.04 <br /> April 6, 1999 <br /> • Page 4 <br /> • purging a minimum of three well volumes from each well using an electric submersible <br /> PUMP <br /> • purging equipment will be cleaned with a solution of trisodium phosphate and <br /> water between purging events to minimize the potential for cross-contamination. <br /> During purging, pH, temperature, and conductivity of the purge water will be <br /> monitored using a clean pH/temperature/conductivity meter. All purge water <br /> will be stored on site in sealed, labeled 55-gallon drums <br /> • obtaining one sample from each well by decanting water obtained from each well <br /> using a clean disposable bailer into an appropriate laboratory container and submitting <br /> water samples under chain-of-custody documentation to a California-certified <br /> laboratory for analysis of Total Petroleum Hydrocarbons(TPIT) as gasoline, diesel, <br /> and motor oil using Modified EPA Method 8015,Benzene, Toluene, Ethylbenzene, <br /> and Total Xylenes(BTEX)using EPA Method 8020, and Methyl-t-butyl ether <br /> (MTBE),Diisopropyl ether(DIPE),Ethyl-t-butyl ether(ETBE), Tert-amyl methyl <br /> ether(TAME), Tert Butanol, Ethanol, and Methanol using EPA Method 8260B <br /> • upon receiving test results, we will complete a quarterly status report containing <br /> a site plan showing the well locations, groundwater flow direction and gradient, <br /> and laboratory test results with chain-of-custody documentation. <br /> REPORTING <br /> Upon completion of our field work and the laboratory testing, we will prepare a technical report <br /> that will include a site plan showing soil boring and monitoring well locations, logs of borings <br /> describing soil type, sample locations, and well construction details, laboratory test results with <br /> chain-of-custody documentation, a summary of the well survey and an as-built plan of the existing <br /> soil vapor extraction framework, conclusions regarding groundwater quality, flow direction, and <br /> gradient beneath the site, and recommendations for further investigation, if necessary. <br /> INK <br /> WALLACE•KUHL <br /> Recycled paper Er ASSOCIATES INC. <br /> a <br />