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' QUARTERLY MONITORING REPORT -2- <br /> TffiRD QUARTER 1992—BEACON STATION #494 <br /> AMV Project No. ULT05.0217 <br /> ' <br /> 4- <br /> TABLE 1 <br /> ' GROUND WATER ELEVATIONS <br /> Ground Water <br /> Monitoring Top of Riser Depth to Water Elevation Physical <br /> Well Date (feet)' (feet) (feet) Observation <br /> MW-1 4-17-92 18 98 7145 -5247 No LPHb <br /> ' 7-15-92 7502 -5604 No LPH <br /> MW-2 4-17-92 1953 7202 -5249 No LPH <br /> 7-15-92 7553 -5600 No LPH <br /> MW-3 4-17-92 1879 71 29 -5250 No LPH <br /> 7-15-92 7479 -5600 No LPH <br /> -Riser elevations were surveyed to a San Joaquin County bench mark, a railroad spike, located in the side <br /> of a telephone pole 2 feet above the ground surface at the northeast corner of "D" Street and East Fremont <br /> ' Street with an elevation of 21 43 feet above mean sea level <br /> 'LPH - hquid-phase hydrocarbon <br /> ' TABLE 2 <br /> ' GROUND WATER SAMPLE ANALYTICAL RESULTS <br /> (concentrations in parts per billion) <br />' Motutormmg Date Total <br /> Well Sampled Benzene Toluene Ethylbenzene Xylenes TPHe TPHdb PCE0 <br /> MW-1 4-17-92 <0 5 <05 <05 <05 <50 <100 <br /> 7-15-92 14 <05 <05 085 470 NAd NA <br /> MW-2 4-17-92 16 08 <05 1 2 1,000° <100 <br />' 7-15-92 36 091 <05 10 1,900 NA 023 <br /> MW-3 4-17-92 180 220 39 170 3,600 <100 <br /> 7-15-92 880 46 <50 26 1,800 NA NA <br />' -TPHg = total petroleum hydrocarbons as gasoline <br /> 'TPHd = total petroleum hydrocarbons as diesel <br />' OPCE = Tetrachloroethene <br /> dNA = not analyzed <br /> °Lab reported that the compound quantified as TPHg did "not match the gasoline fingerprint " <br />