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MTBE, ETBE, DIPE, TBA, TAME, 1,2-Dichroloethane, and 1,2-Dibromoethane using to EPA method 8260B DISPOSITION OF WASTEWATER The 90 gallons of wastewater that were generated from purging of the monitor wells and decontamination of the purging and sampling equipment were transported via a non hazardous waste manifest to Instrat, Inc , a licensed recycling facility on July 1, 2004 GROUNDWATER GRADIENT AND FLOW DIRECTION Figure 4 shows the groundwater elevation gradient and flow direction determined from depth to water measurements at the four on-site monitor wells on June 17, 2004 The groundwater elevation has increased by an average of 0 25 feet since the previous quarterly monitoring round on February 27, 2004 The flow direction is to the ESE The overall gradient is 0 002 feet/linear foot RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES The results of the certified analyses of groundwater samples collected from the four monitor wells on June 17, 2004 are shown in Table 1 Copies of the laboratory reports are included as Appendix C of this report TPH-G concentrations in MW1-MW3 ranged from a maximum of 4500 ug/1 at monitor well MW1 to 1300 ug/1 at monitor well MW2 Monitor well MW4, completed in a lower aquifer, showed a TPH-G concentration of 180 ug/l Benzene concentrations in MW 1-MW3 ranged from a maximum of 2000 ug/1 at MW 1 to 450 ug/l at MW2 Monitor well MW4 showed a Benzene concentration of 0 6 ug/1 MTBE concentrations in MW1-MW3 ranged from a maximum of 26 ug/1 at MW3 to 3 9 ug/1 dt MW2 MTBE was not detected above 0 5 ug/l in MW4 The remaining fuel oxygenants, TBA, ETBE, DIPE, and TAME were not found above the laboratory detection limits in any of the four monitor wells The lead scavenger 1,2 Dichloroethane (DCA) was detected in a concentration of 2 1 ug/L in MW3 and 1 8 ug/L in MW2 DCA was not detected above the laboratory limit of 5 ug/L and 0 5 ug/L in MWl and MW4 respectively 1,2 Dibromoethane (DBA or EDB) was not found in any of the monitor wells above the laboratory detection limit that ranged from 0 5 to 5 ug/L Figure 5 shows the distribution of TPH-G, BTEX, and MTBE in groundwater and the estimated lateral limits of the TPH-G in groundwater as determined from groundwater samples collected on June 17, 2004 i 3 Arc Pump QM 4-6, 2004