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Date. July 31,2002 <br /> Quarter: 2'Quarter,2002 <br /> 16 <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg) were reported in four of the seven monitoring wells sampled this <br /> quarter at concentrations ranging from 59 ppb (MW-2 ) to 510 ppb (MW-4) Benzene was reported in four of the <br /> seven wells at concentrations ranging from 1 6 ppb (MW-1) to 15 ppb (MW-5) Methyl tert-butyl ether (MtBE), <br /> analyzed using EPA Method 8260B, was reported in six of the seven wells with concentrations ranging from 0 57 <br /> ppb (MW-1) to 1,100 ppb(MW-5) TBA was detected to three wells in concentrations ranging from 6 ppb(MW-7) <br /> to 34 ppb (MWS) Other fuel oxygenates were not detected in the wells Some volatile organic compounds were <br /> detected at low concentrations (Table 4) ChenucaI concentrations were generally consistent with previous quarterly <br /> data with the following exceptions MTBE concentrations in well MW-5 increased, and TPHg concentrations <br /> decreased significantly in wells MW-4 and MW-7 Groundwater elevations increased by an average of 17 feet <br /> Groundwater flow was to the east-northeast at an approximate gradient of 0 019 fdit <br /> TABLES - <br /> Table 1 Groundwater Elevation and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Volatile Organic Compounds Analytical Data <br /> Table 4 Groundwater Gradient Data <br /> FIGURES <br /> Figure 1 Groundwater Elevation Contour Map <br /> Figure 2 Groundwater Concentration Map <br /> APPENDICES <br /> Appendix A Field and Laboratory Procedures <br /> Appendix B Laboratory Analytical Reports,Cham-of-Custody Documentation, and Field Data Sheets <br /> K VS BP ARC0V4491RQ--n lY _QTR 021GWMR d- Page 2 <br />