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Mr Harlin Knoll Page 2 <br /> 17 December 1991 <br /> . Table 2 <br /> Monitoring Well Development Data <br /> Well # Volumes Bailed pH Temperature Conductivity <br /> SFW-1 12 731 70 5°F 1770µS <br /> SFW-2 17 711 70 4°F 1820µS <br /> SFW-3 18 7.17 701°F 2040pS <br /> Following well purging, water samples were obtained by lowering a <br /> decontaminated Teflon bailer into the well The sample water was <br /> immediately transferred by gently pouring the contents of the baler into <br /> clean volatile organic analysis (VOA) vials, filling each completely Care <br /> was taken to minimize any agitation of the water sample The sample vial <br /> was then capped with a Teflon septum cap such that zero headspace was <br /> achieved, and no air bubbles were visible when turned upside-down <br /> Additional sample water was transferred into a 1-liter amber glass <br /> container The sample containers (VOA vials and 1-liter amber glass) were <br /> labeled with the well number, date, time, sampler's initials, location, and <br /> analysis required, and stored on ice in a cooler for delivery to the laboratory <br /> Each sample was logged onto a chain-of-custody form (See Attachment 1) <br /> • All purge water from the development of the wells wasin a laced 55-gallon <br /> P g <br /> drum pending the results of the groundwater analyses <br /> The water samples were analyzed for Total Petroleum Hydrocarbons by <br /> EPA Method 8015 (Modified) and Benzene, Toluene, Xylenes, and <br /> Ethylbenzene (BTX&E) by EPA Method 602 Methods of preparation and <br /> analysis of water samples are summarized in Table 3 along with target <br /> detection limits <br /> All sample analyses were performed by Sequoia Analytical, a State-of- <br /> California-certified laboratory which maintains well-established and <br /> documented quality assurance/quality control (QA/QC) programs Sequoia <br /> Analytical strictly adheres to Section 10 ("Quality Control/Quality <br /> Assurance") of "Test Methods for Evaluating Solid Waste" (EPA Manual <br /> 600/4-79-019, March 1979) Sections of these two documents involving the <br /> QA/QC aspects of sample collection, preservation, and sample handling are <br /> also followed by ERM-West <br /> Results of water analyses are summarized in Table 4. Original laboratory <br /> reports appear in Attachment 2 No water samples had any detectable <br /> concentrations of TPH or BTX&E <br />• <br />