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Mr Harlin Knoll Page 2 <br /> 29 April 1993 <br /> . Table 2 <br /> Monitoring Well Development Data <br /> Well # Volumes Bailed pH Temperature Conductivity <br /> SFW-1 5 672 21 0°C 1210µS <br /> SFW-2 5 654 21 0°C 1180µS <br /> SFW-3 5 688 21 0°C 1300µ6 <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 bailer into <br /> clean volatile organic analysis (VOA) vials, filling each completely Care was <br /> taken to minimize any agitation of the water sample The sample vial was <br /> then capped with a Teflon septum cap such that zero headspace was achieved, <br /> and no air bubbles were visible when turned upside-down <br /> Additional sample water was transferred into a 1-liter amber glass container <br /> The sample containers (VOA vials and 1-liter amber glass) were labeled with <br /> the well number, date, time, sampler's initials, location, and analysis <br />. required, and stored on ice in a cooler for delivery to the laboratory Each <br /> sample was logged onto a chain-of-custody form (See Attachment 1) <br /> All purge water from the development of the wells was placed in a 55-gallon <br /> drum pending the results of the groundwater analyses <br /> The water samples were analyzed for Total Petroleum Hydrocarbons (Diesel) <br /> by EPA Method 8015 (Modified) The samples were not analyzed for benzene, <br /> toluene, xylenes, and ethylbenzene since these constituents have not been a <br /> concern at this site in the past <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 3 Original laboratory <br /> reports appear in Attachment 2 No water samples had any detectable <br /> concentrations of petroleum hydrocarbons <br />