Laserfiche WebLink
Mr Harlin Knoll Page 2 <br /> 12 July 1993 <br /> • Table 2 <br /> Monitoring Well Development Data <br /> Well # Volumes Bailed pH Temperature Conductivity <br /> SFW-1 5 666 20 9°C 930 gS <br /> SFW-2 5 656 20 7°C 890 µS <br /> SFW-3 5 672 20 8°C 823 gS <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 into 1-liter amber glass containers Two liters of <br /> sample were collected from each well The sample containers were labeled <br /> with 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 2) <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 as diesel <br /> (TPH-D) by EPA Method 8015 (Modified) The samples were not analyzed for <br /> benzene, toluene, xylenes, and ethylbenzene since these constituents have <br /> not been a 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/ 1-79-019, 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 3 No water samples had any detectable <br /> concentrations of oil and grease A high boiling point hydrocarbon was <br /> detected at a concentration near the detection limit in well SFW-3 The <br /> laboratory maintains that the peak is not characteristic of diesel or fuel oil, <br /> and could be some type of plant matter <br />