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90343TEXT CON-6 • • <br /> be essentially insoluble, it is also considered a distillate fuel oil . <br /> This would suggest that it contains some lighter ends which may to some <br /> degree, partition into the water. This partitioning may be very limited <br /> with appreciable hydrocarbon concentrations restricted to just below the <br /> oil plume. Due to the thorough development of MW-14 prior to sampling, the <br /> sample taken would be more indicative of the overall formation water versus <br /> the water in the immediate vicinity of the plume. <br /> Well Monitoring Results <br /> The fluid level observation data suggests that some free floating oil <br /> is present below the tank farm area (MW-14) but apparently does not extend <br /> much beyond its perimeter. During the development of MW-14 the free oil <br /> present in the well (0.10 ft) was removed and did not return to any <br /> appreciable thickness for two weeks. The slow recovery is generally <br /> indicative of a small amount of free oil in the formation. This could, <br /> however, change when the water table rises again in the winter time as <br /> experienced previously in wells MW-9 and MW-10. <br /> i <br /> The recent rise in the water table is somewhat unexpected especially <br /> considering that it is not rising uniformly. The southern most wells (MW- <br /> 13 through MW-16) experienced the greatest rise while the majority of the <br /> r other wells experienced only slight increases in water table elevation. <br /> Initially, it was thought that locally heavy irrigation or discontinued <br /> groundwater pumping at the nearby Occidental Chemical facility may be the <br /> cause. However, Occidental ' s consultant, R. F. Weston, has said that their <br /> pumping has not been altered significantly and that they too are <br /> experiencing an unexplained water table rise. Apparently, significant <br /> water table fluctuations are common in the area during this time of the <br /> year although the cause is still uncertain. <br /> Conclusions <br /> Based on the above observations and sample analyses, the soil <br /> contamination and oil floating on the water table appears to be localized <br /> and confined to the area below the straw oil tank farm. The soil <br />