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Ms Mary Meays Page 4 <br /> April 15, 1993 <br /> afternoon coincide with the fact that the tide was higher when the afternoon <br /> measurements were obtained <br /> ' In the afternoon, the water level measured at MW-2A was 0 15 feet lower <br /> than was previously measured in the morning This observation is in <br /> contrast to all of the other wells in which the afternoon measurements were <br /> higher than those made in the morning It is probable that the drop in water <br /> elevation at MW-2A was a result of purging activities associated with <br /> sampling Tidal fluctuations do not appear to affect this well Instead, rain <br /> and purging activities cause the water level to rise and drop, respectively <br /> This contrast provides further evidence that the water in MW-2A is perched <br /> and unrelated to the other three wells. Groundwater interconnection <br /> ' between MW-2A and the other three wells is therefore very unlikely <br /> The laboratory data (Table 3) indicate that MW-1A continues to have the <br /> ' highest measured concentrations of TPH-G and related petroleum <br /> compounds at Former Tank Site #2 The concentration of TPH-G and BTEX <br /> compounds all increased from the previous quarter Further monitoring <br />' programs may provide an explanation for these elevated constituent <br /> concentrations at MW-1A TPH-D (non-diesel mixture) measured in <br /> groundwater at MW-1A was also higher than was previously observed in this <br /> well. <br /> For the second consecutive quarter, MW-2A showed non-detectable levels of <br />' TPH-G, TPH-D (non-diesel mixture), and petroleum related compounds <br /> This represents a culmination of a trend of diminishing concentrations of <br /> these constituents observed during the previous quarters It is likely that the <br />' TPH-G, TPH-D and BTEX in this perched water have been removed during <br /> sampling and purging activities and natural degradation <br />' MW-3A and MW-4A showed no detectable quantities of gasoline, diesel and <br /> petroleum compounds The absence of these compounds in these wells is <br /> consistent with the results from the previous three quarters However, in the <br />' April 1992 monitoring, MW-3A had very low levels of BTEX compounds <br /> Thus, it is probable that MW-3A is situated on the margin of the area affected <br /> by gasoline from the UST <br /> 1 <br /> 1 <br />