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the tank was discharged to sewer No pumping from MW10 has occurred since that time, see Sewer Discharge Reports and Table 4 RESULTS OF CERTIFIED ANALYSES OF GROUNDWATER SAMPLES MONITOR WELLS Sanchez monitor wells MW2, MW3, MW4, MW5 and MW I O along with Country Club Food and Fuel (CCFF) penetrated both the A and B zones Contaminants found in these wells would nix with the groundwater of both zones TOTAL PETROLEUM HYDROCARBONS,GASOLINE RANGE(TPHG) FIGURE 5A Figure 5A represents the TPHg hydrocarbon groundwater plume in the A zone along with the plume beneath CCFF The Sanchez plume is elongated extending west of MW2 out to "Geoprobe" hole P9 were degradation has left only minor TPHg (470 ug/L), Toluene (0 65 ug/L) and tert-Butanol (1 I ug/L), the degradation byproduct of MTBE Highest concentrations of TPHg are associated with the area that was over-excavated, MW 10 This area formerly contained temporary piezometers PZ1A and PZ2A (highest concentration of hydrocarbons 140,000 ug/L and 62,000 ug/L TPHg respectively on January 31, 2003) The MW10 area has since reduced to 8,000 ug/L Newly installed downgradient well MW9A is below laboratory lower detection limits The CCFF TPHg plume is associated with well MWI and seems to be confined to the north pump island area and areas to the west northwest FIGURE 5B Figure 5B represents the hydrocarbon groundwater plume in the B zone and shows a similar elongated plume extending west from MW2 out to "Geoprobe" hole P9 where degradation has left only minor amounts of Toluene (0 81 ug/L), Xylenes (0 83 ug/L) and MTBE (1 6 ug/L) Again the highest concentrations are associated with the area that was over-excavated and contained temporary piezometers PZ1B and PZ2B with 40,000 ug/L and 16,000 ug/L TPHg respectively on January 31, 2003 Newly installed excavation monitor well MW10 contains 5,000 ug/L TPHg • 9 Sanchez QM 4ch 2005