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4 3 Mr .ferry Moore Project 2520-100 01 July 27, 1994 Page 2 v� GROUNDWATER FLOW DIRECTION Historical and second quarter 1994 water level measurements are summarized in Table i The water level measurements collected on May 16, 1994, were used to calculate groundwater elevations in wells MW-1 through MW-9 Figure 2 is a groundwater contour map based on the May 1994 groundwater elevations Interpretation of the May 1994 groundwater elevation data indicates a diverging south and southwest direction of groundwater flow with approximate gradients of 0 002 foot per foot ANALYTICAL RESULTS Certified analytical reports and chain-of-custody records are located in Appendix B Historical and second quarter 1994 analytical results are summarized in Table 2 Petroleum hydrocarbons were not detected in the groundwater samples collected from wells MW-2 and MW-5 through MW-9 during the second quarter 1994 monitoring event Concentrations of petroleum hydrocarbons detected in wells MW-1, MW-3, and MW-4 during the second quarter of 1994 are generally lower than concentrations detected in the first quarter of 1994 Concentrations of 1,2-dichloroethane detected in wells MW-1 through MW-5 ranged from 12 to 46 micrograms per liter Figure 3 shows concentrations of benzene detected in groundwater during the May 1994 monitoring event ADDITIONAL ACTIVITIES EMCON is in the process of obtaining permits to install the soil vapor and groundwater remediation system LIMITATIONS The services described in this report were performed consistent with generally accepted professional consulting principles and practices No other warranty, express or implied, is made These services were performed consistent with our agreement with our client This report is solely for the use and information of our client unless otherwise noted Any reliance on this report by a third party is at such party's sole risk SAC/P12\2520\25201000 las-94 pas'