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1 <br /> On May 17, 1996, IT Corporation sampled the groundwater from the three monitoring wells <br /> This was the first recorded groundwater analytical data from these wells Groundwater samples <br /> from each of the wells contained concentrations of gasoline hydrocarbons including benzene <br /> The highest concentrations of TPH-gasolene (770 micrograms per liter(,ug/L)) and benzene (2 2 <br />' /zg/L) were detected in MW-3 Groundwater from the three wells was sampled again on <br /> September 27, 1996 The analytical results from this sampling event indicated that two of the <br /> three wells (MW-1 and MW-3) did not contain detectable concentrations of gasoline <br /> hydrocarbons The groundwater sampled collected from MW-2 did contain 430,ug/L of TPH- <br />' gasoline and 3 7 4g/L of benzene <br />' 3.0 Groundwater Monitoring <br /> On December 13, 1996, groundwater from the three on-site wells was monitored and sampled A <br /> monitoring well construction summary for all of the wells installed at the site is presented in <br /> Table I and the well locations are illustrated in Figure 2 (Site Pian) Depth to groundwater <br />' measurements were taken in all three monitoring wells to evaluate groundwater flow and <br /> gradient characteristics The depth to groundwater at the site ranged from 35 02 to 36 30 feet <br /> bgs As such, the groundwater surface is above the screened interval of the three on-site wells <br /> Groundwater elevations beneath the site ranged from a high of 64 11 feet in MW-3 to a low of <br />' 62 16 feet in MW-2 Wellheads were previously surveyed relative to an arbitrary datum of 100 <br /> feet On average, groundwater levels dropped approximately 2 03 feet since the last momtonng <br /> event in September 1996 Groundwater flow was determined to be in a southerly direction at a <br /> gradient of 0 07 foot/foot The groundwater flow direction is not consistent with the last <br /> monitoring event and the gradient decreased 0 10 foot/foot A groundwater surface contour map <br /> is included as Figure 3 IT collected dissolved oxygen readings from each monitoring well <br />' Dissolved oxygen concentrations ranged from 0 15 ppm in MW-2 to 0 23 ppm in MW-3 A <br /> summary of groundwater monitoring data is provided in Table 2 <br /> 1 <br /> 2 <br />