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f ti Mr Harlin Knoll Page 2 ' - 24 March 1992 Additional sample water was transferred into a 1-liter amber glass container The sample containers (VOA vials and 1-liter amber glass) were labeled with the well number, date, time, sampler's initials, location, and analysis required, and stored on ice in a cooler for delivery to the laboratory Each sample was logged onto a chain-of-custody form (See Attachment 1) All purge water from the development of the wells was placed in a 55-gallon drum pending the results of the groundwater analyses The water samples were analyzed for Total Petroleum Hydrocarbons by EPA Method 8015 (Modified) and Benzene, Toluene, Xylenes, and Ethylbenzene (BTX&E) by EPA Method 602 Methods of preparation and analysis of water samples are summarized in Table 2 along with target detection limits All sample analyses were performed by Sequoia Analytical, a State-of- California-certified laboratory which maintains well-established and documented quality assurance/quality control (QA/QC) programs Sequoia Analytical strictly adheres to Section 10 ("Quality Control/Quality Assurance") of "Test Methods for Evaluating Solid Waste" (EPA Manual 600/4-79-019, March 1979) Sections of these two documents involving the QA/QC aspects of sample collection, preservation, and sample handling are also followed by ERM-West Results of water analyses are summarized in Table 3 Original laboratory reports appear in Attachment 2 No water samples had any detectable concentrations of TPH or BTX&E Table 2 Sample Preparation&Analytical Methods and Target Detection Limits for Water Analyses Water Preparation Analysis AWL TPH-D EPA Method 3550 EPA Method 8015 (Mod.) 1 mg/1 BTX&E EPA Method 5030 EPA Method 602 1 /1 Table 3 February 1992 Analytical Results Sample TPH B`I &E SFW-1 < 50 µg/I < 0 3 µg/1 . SFW-2 < 50 µg/1 < 0 3 µg/l SFW-3 < 50 < 0 3 /l