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1 <br /> 2 0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS <br /> On July 30, 2001, Ramage Environmental monitored and sampled the three on-site <br /> groundwater monitoring wells <br /> 21 Groundwater Monitoring <br /> 1 Depth-to-groundwater measurements were taken in all three monitoring wells to evaluate <br /> groundwater flow and gradient characteristics The depth to groundwater beneath the <br />' site ranged from 39 46 feet bgs in MW-2 to 40 51 feet bgs in MW-1 The corresponding <br /> groundwater surface elevation ranged from a high of 21 16 feet below mean sea level <br /> (msl) at MW-3 to a low of 21 64 feet below msl at MW-2 The cumulative groundwater <br /> monitoring data are summarized in Table 1 <br /> The groundwater flow direction and gradient are shown on the groundwater surface map <br /> (Figure 3) In general, the resulting groundwater surface appears as a plane dipping to <br /> the south-southeast at a gradient of approximately 0 05 foottfoot This is consistent with <br /> groundwater surface measurements taken in previous quarters <br /> 2.2 Groundwater Sampling and Analysis <br /> Groundwater from all three wells was sampled to evaluate the concentration of gasoline <br /> hydrocarbons in groundwater beneath the site Each of the wells was purged of at least <br /> three well volumes using dedicated and disposable tubing and a pump Temperature, <br /> tpH and electrical conductivity measurements were taken during purging Following <br /> purging, groundwater samples were collected from all three wells using dedicated and <br />' disposable sampling bailers The groundwater samples were collected in laboratory- <br /> supplied containers, labeled and packed in an iced cooler for transport with chain-of- <br /> custody documentation to Kiff Analytical, LLC (Kiff), a state of California certified <br /> analytical laboratory (#2236) <br />' Kiff analyzed the groundwater samples for TPH-as-gasoline, BTEX, MTBE, diisopropyl <br /> ether (DIPS), ethyl-t-butyl ether (ETBE), tert-amyl methyl ether(TAME), TBA and 1,2- <br /> DCA by EPA Method 8260E The laboratory report and chain of custody are included in <br /> iAppendix A <br /> 6 <br />