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�c <br /> .10 Mr. Jerry Moore Project 2520-100.001 <br /> ` April 14, 1995 <br /> Page 2 <br /> were installed by Delta in November and December 1989, and well MW-9 was installed by <br /> Aegis in November 1991. Minimal impact to soil and groundwater was noted in the <br /> samples collected from wells MW-5 through MW-9. <br /> Construction of the soil and groundwater system was initiated on December 5, 1994, and <br /> completed on December 23, 1994. <br /> GROUNDWATER FLOW DIRECTION <br /> Historical and first quarter 1995 water level measurements are summarized in Table 1. The <br /> water level measurements collected on February 21, 1995, were used to calculate <br /> groundwater elevations in wells MW-1 through MW-9. Figure 2 is a groundwater contour <br /> map based on the February 1995 groundwater elevations. Interpretation of the February <br /> 1995 groundwater elevation data indicates convergent flow near MW-1 and.divergent flow <br /> in the eastern section of the property. The approximate gradient in the western section of <br /> the property ranges from 0.02 to 0.04 foot per foot. <br /> ANALYTICAL RESULTS <br /> Certified analytical reports and chain-of-custody records are located in Attachment B. Historical <br /> and first quarter 1995 analytical results are summarized in Table 2. <br /> Petroleum hydrocarbons were not detected in the groundwater samples collected from <br /> wells MW-6 through MW-9 during the first quarter 1995 monitoring event. Concentrations <br /> of petroleum hydrocarbons detected in wells MW-4 and MW-8 during the first quarter of <br /> 1995 are generally lower than concentrations detected in the fourth quarter of 1994, while <br /> concentrations of petroleum hydrocarbons detected in wells MW-1, MW-2, and MW-3 <br /> during the first quarter of 1995 are generally higher than concentrations detected in the <br /> fourth quarter of 1994. Concentrations of 1,2-dichloroethane detected in wells MW-1 <br /> through MW-5 ranged from 5.4 to 29 micrograms per liter. The analytical laboratory noted <br /> that the chromatogram fingerprint for the compound reported as total petroleum <br /> hydrocarbons as diesel in samples MW-1 through MW-4 is not characteristic of diesel; <br /> however, hydrocarbons in the gasoline time range were detected. Figure 3 shows <br /> concentrations of benzene detected in groundwater during the February 1995 monitoring <br /> event. <br /> sA(W:\P1Z\2520\25201000.I PS-944Ib:l <br />