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. This quarter's measurements of groundwater elevations were contoured and indicate a <br /> delineated line between MW-1 and MW-4 The area above the delineation line defined <br /> directional flow in an east-northeasterly orientation while the area below the delineation line <br /> defined directional flow in an eastern orientation The hydraulic gradient averages 0 0016 feet <br /> per foot across the well field (above the delineation line) and 0 0016 feet per foot across the <br /> well field (below the delineation line) A groundwater elevation summary and directional flow <br /> map for the second quarter groundwater measurements are shown on Figures 4 and 5 <br /> The groundwater elevation data collected during this event is typical of the site, and is <br /> consistent with historical data and seasonal trends <br /> U b <br /> 52 Groundwater Sample Analysis U <br /> This section presents the results of the most recent groundwater sampling event, and <br /> synthesizes these data with other data previously collected Table 2 summarizes the <br /> groundwater monitoring well analytical results from the most recent groundwater monitoring <br /> event Certified analytical laboratory reports and cham-of-custody documentation are included <br /> as Appendix C <br /> TPH-diesel appeared in MW-1 at a concentration of 15000 ppb, a significant increase from last <br /> quarter All other constituents were below the reporting limits <br /> MW-2 found continued contamination from DIPE, BTEX, TPH-diesel, and TPH-motor oils <br /> DCA12 again made an appearance and TAME appeared for the first time in the history of <br /> sampling this well TBA, TPH-gasoline, EDB, , MTBE, and ETBE were below the reporting <br /> limits <br /> • yt <br /> MW-3 continues to remain free of contamination <br /> TPH-diesel and TPH- motor oils in MW-4 remain below the reporting limits, while DCA12, <br /> DIPE, BTEX, and TPH-gasoline decreased overall since last quarter EDB again for the first <br /> tune since second quarter 2004 TBA,MTBE,ETBE,and TAME were below reporting limits <br /> All groundwater samples secured by EI were logged in a chain-of-custody form, placed in an <br /> ice chest and picked up by a California Department of Health Services (DHS) certified <br /> laboratory for analysis <br /> 5.3 Free Product <br /> A September 1998 sample of groundwater morntonng well MW-2 found black, floating oil that <br /> appeared to be typical of used motor oil Floating oil has been removed from MW-2, using <br /> disposable bailers and absorbent socks, periodically since that time Approximately 20 1 <br /> gallons of floating oil have been removed(Table 3) <br /> 3 <br /> 5166 <br />