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hKLEINFELDER File No. 20-3937-01 September 3, 1996 For a summary of the results obtained, please refer to the "Tables" tab of this report (Page T- 1.1). 5.2 GROUNDWATER ASSESSMENT There were two objectives of.'the groundwater assessment and sampling: To assess the presence of selected contaminants in groundwater near the property line. • To assess the groundwater gradient direction and the potential groundwater flow direction. 5.2.1 Groundwater Assessment Depth-to-water measurements from the three (3) monitoring wells ranged from 58.11 to 59.22 feet on July 30, 1994_ These measurements were subtracted from the surveyed top of casing elevations (relative to an arbitrary established bench mark) to obtain a relative groundwater elevation for each well. The groundwater elevations were within a total range of 1.63 feet (MW-1 = 45.24 ft., MW-2 = 45.10 ft., and MW-3 = 43.61 ft.) . A groundwater gradient and direction was calculated using the aforementioned information. The groundwater flow direction was estimated to the southwest at a relatively flat gradient of 0.003 ft/ft. 5.2.2 Groundwater Analytical Results The three groundwater samples,were submitted under chain-of-custody procedures to Sequoia Analytical in Sacramento, California, to provide a quantitative assessment of selected analytes in the .groundwater at the subject site. Sequoia Analytical is California Department of Toxic Substances Control (DISC) certified for the requested analyses. Analytical results for the water samples are summarized on Table 2. The laboratory data sheets and chain-of-custody forms are included in Appendix E. 20-3937-011MR960189 Page II of 18 01996. Kleinfelder,Inc.