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"Certified clean" one liter glass sample containers, supplied by the laboratory, were used <br /> during the collection of groundwater samples The samples were placed on ice <br /> immediately following collection, and kept in coolers until delivery to laboratory <br /> 2 2 Laboratory Procedures <br /> Groundwater samples were analyzed by STL, Inc , located in West Sacramento, California <br /> The samples were analyzed for TPH-D using EPA Method 8015M with Northwest Cleanup <br /> Procedure, which was included in order to remove non-petroleum hydrocarbons Copies <br /> of the laboratory reports are attached in Appendix B <br /> 3 0 RESULTS AND DISCUSSION <br /> This section presents the results of the second quarter 2000 monitoring event <br /> 3 1 Data Validation <br /> The laboratory report provided by STL was reviewed by URS/Dames & Moore's data <br /> validation group in order to insure that the reported data results are accurate The data <br /> validation report is included with Appendix B All data were determined to be acceptable <br /> for use <br /> 32 Groundwater Levels <br /> Groundwater was measured to be approximately 35 feet below ground surface on May 26, <br /> 2000 Water levels increased approximately two feet between February and May, 2000 <br /> The depth to water is equivalent to the level measured during June of 1999 Water levels <br /> have increased approximately 31 feet since 1990 <br /> The direction of groundwater flow in May 2000 was variable, with the strongest component <br /> oriented towards the north-northeast, as illustrated in Figure 3 Variations in the direction of <br /> groundwater flow between 1987 and 2000 are presented in Figure 3 Flow directions <br /> appear to have shifted from west in 1987 to the east in 1995, and are now generally in the <br /> direction of north-northeast to northeast <br /> 33 TPH-D in Groundwater <br /> TPH-D groundwater results for samples collected on May 26, 2000 have been compiled <br /> with previous data in Table 3 Groundwater samples from wells, DMW-6 (53 Pg/L) and <br /> DMW-7 (74 ,uglL) contain unknown hydrocarbon which does not correspond to the diesel <br /> standard Review of the chromatograrns for these two samples suggests that the unknown <br /> hydrocarbon may represent a highly weathered fuel For reference, the chromatograms are <br /> Dames&Moore 4 J 1AFPIREPORTIQ2-2000 DOC <br />