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.:.. <br /> Mr. Glenn It. Dambroff <br /> Ultramar Inc. <br /> April 9, 1991 <br /> Page 4 <br /> TABLE 2 <br /> Ground Water Elevation <br /> Top of Riser Depth to Ground Water <br /> Monitoring a Water ft Cievation ft <br /> Well Date Elevation ft �fL1 <br /> r <br /> MW-20 <br /> 021 T% 30.78 50.50 -19.72 <br /> MW-34 02149/91 30.19 <br /> 50.04 •19.85 <br /> MW-35 <br /> 421091'91 31.38 50.97 -19.59 <br /> MW-36 02/09/91 30.60 50.20 -19.60 <br /> aSurveyed relative to mean sea level. <br /> Ground 3Vnter Annl tical Results <br /> Analytical results of the February 1991 ground water samples are compiled in Table 3. Benzene was <br /> not detected in the ground water sample collected from monitoring well MW-36. Dissolved benzene was <br /> detected at a concentration of 1.8 parts per billion(ppb)in ground water samples collected from both <br /> monitoring wells MW-34 and MW-35. Monitoring well MW-24 was not sampled for analysis during the <br /> February 1991 event. Copies of the February 1991 ground water sample laboratory reports are presented <br /> in Enclosure E <br /> TABLE 3 <br /> Ground Water Sample Analytical Results <br /> Parts per billion(Ppb) <br /> Monitoring Ethyl- <br /> Well Date Benzene Toiuene benzene _Xylene TPII <br /> MW-20 101041906 3.4 <0.5 <br /> <0.5 <0.5 99 <br /> MW-34 <br /> 42/08191 1.8 <0.5 <0.5 4.1 140 <br /> MW-35 02108191 1.8 <br /> 1.6 1.0 11 98 <br /> MW-36 0210$191 <br /> <0.5 <0.5 <0.5 <0.5 <50 <br /> "Total Petroleum Hydrocarbons detected as gasoline. <br /> bFrom Dupont Environmental Remediation Services,Third Quarter 1990 Quarterly Monitoring Report. <br />