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i <br /> This quarter's measurements of groundwater elevations were contoured and a directional flow <br /> in a southeasterly orientation was determined The hydraulic gradient averages 0 0024 feet per <br /> . j foot across the well field A groundwater elevation summary and directional flow map for the <br /> third quarter groundwater measurements are shown on Figures 4 and 5 ; <br /> 1 <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 /> 5 2 Groundwater Sample Analysis <br /> k <br /> This section presents the results of the most recent(09122104)groundwater sampling event, and <br /> synthesizes these data with other data previously collected Table 2 summarizes the j <br /> groundwater monitoring well analytical results from the most recent groundwater monitoring <br /> event Certified analytical laboratory reports and chain-of-custody documentation are included <br /> as Appendix C <br /> TPH-diesel appeared in MW-1 at a concentration of 4500 ppb, a slight decrease from last <br /> quarter All other constituents were below the reporting lunits No e.+h91 '0442 cRt apt" 0.7944 <br /> MW-2 found continued contamination from TBA, DCA12, DIPE, BTEX, TPH-diesel, and <br /> ' TPH-motor oils DCA12 appears at a concentration of 2 49 ppb BTEX reappeared at <br /> concentrations lower than previous quarters TPH-gasoline, MTBE, EDB, ETBE and TAME <br /> were below the reporting limits <br /> } <br /> MW-3 continues to remain free of contamination <br /> ' t TPH-diesel and TPH- motor oils m MW4 remain below the reporting limits, while BTEX and <br /> TPH-gasoline remain consistent in their contamination levels TBA appeared at 25 ppb, 41� e� <br /> I <br /> DCA12 at 283 ppb,and DIPE at 1800 ppb EDB and MTBE was below reporting limits <br /> All groundwater samples secured by E1 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 /> j 5.3 Free Product <br /> i E <br /> 1 A September 1998 sample of groundwater monitoring 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 E <br /> disposable bailers and absorbent socks, periodically since that time Approximately 20.0 <br /> gallons of floating oil have been removed(Table 31 <br /> i <br /> I <br /> 1 <br /> 1 <br />