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J. H. KLEINFELDER &ASSOCIATES <br /> art plotted on Plate No. 8 (Appendix A) . Monitoring wells MW--1 and <br /> MW-7 appear to have been constructed into the mair. body of the <br /> plume. Monitoring well MW-4 appears to define the north—eastern <br /> edge of the plume. The south--western edge and the distance the <br /> plume has traveled to the south—southeast cannot be determined <br /> at this time. <br /> A ground water velocity of approximately 4.3 x 10-4 cm/sec was <br /> calculated based on the data from the October 8 and 9, 3.986 pump <br /> .^ �> test conducted on monitoring well MW-7. If aquifer conditions <br /> are assumed to be homogeneous, the ground water beneath the tank <br /> excavation area could travel approximately 400 £t/year to the <br /> south—southeast. <br /> A low concentration of toluene was detected in water sample W001 <br /> ^� collected from monitoring well MW-5. Toluene was the only <br /> constituent detected in sample ri001 . The toluene concentration <br /> does not appear to be related to . the tank excavation area. <br /> Gasoline related constituents were below detectable limits in <br /> water sample W003 collected from monitoring well MW-3 located <br /> directly between the tank excavation area and monitoring well MW- <br /> 5. The toluene concentration in MW-5 may be related to an <br /> unknown up gradient source. Toluene was previously detected at a <br /> concentration of 37.7 ug/L in water samples collected by Guild <br /> from the surface impoundment located directly north of the Guild <br /> facility. <br /> 19:531 14 <br /> v <br />