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KLEINFELDER <br /> 5 MONITORING RESULTS <br /> The depth to groundwater was measured in each monitoring well included in this event <br /> except for MW-DIS-4, due to an obstruction. The depth to groundwater measurements <br /> were converted to MSL elevation to estimate the groundwater gradient. <br /> The thirteen-groundwater samples were submitted under chain-of-custody procedures <br /> to Sequoia Analytical Laboratories of Sacramento, California. Table 2 is a summary of <br /> the analytical results for groundwater. The chain-of-custody forms and laboratory <br /> analytical reports are included in Appendix C. <br /> 5.1 WATER LEVELS <br /> On August 29, 2005, 19 monitoring wells (excluding MW-DIS-4) and 3 piezometers <br /> were sounded for depth to groundwater. The depth to groundwater ranged from 44.46 <br /> feet below the top of the well casing (MW-DIS-11 s) to 53.67 feet below the top of the <br /> well casing (MW-DIS-14d). <br /> Groundwater elevations for the monitoring wells ranged from -33.56 feet MSL (MW-DIS- <br /> 6) to —34.12 feet MSL (MW-DIS-13). The groundwater gradient was estimated to be <br /> east/southeast at 0.0004 ft./ft. Plate 3 shows the interpreted groundwater elevation <br /> contours. Table 2 presents the recorded groundwater elevations on August 29, 2005 and <br /> past monitoring events. <br /> 5.2 ANALYTICAL METHODS AND REPORTED RANGES <br /> Thirteen groundwater samples were collected and submitted for analysis. The following <br /> is a list of the requested analyses and the reporting limits for groundwater samples <br /> obtained from the monitoring wells and piezometers this quarter: <br /> • Total Petroleum Hydrocarbons as gasoline <br /> by EPA Method 8015M/8021 B [non-detect < 50 pg/1 to 20,000 pg/1]; <br /> • Benzene by EPA Method 8015M18021 B [non-detect < 0.50 pg/I to 200 pg/1]; <br /> Toluene by EPA Method 8015M/8021 B [non-detect < 0.50 pg/I to 200 pg/1]; <br /> • Ethylbenzene by EPA Method 8015M18021 B [non-detect < 0.50 pg/I to 200 pg/1]; <br /> • Xylene by EPA Method 8015M18021 B [non-detect < 0.50 pg/1 to 200 pg/1]; <br /> 1,2-DCA by EPA Method 8260B [non-detect < 0.50 pg/1 to 50 pg/1]; <br /> EDB by EPA Method 8260B [non-detect < 0.50 pg/1 to 50 pg111; <br /> • TBA by EPA Method 82608 [non-detect < 5.0 pg/I to 500 pg/1]; <br /> • MTBE by EPA Method 82608 [non-detect < 0.50 pg/1]; <br /> DIPE by EPA Method 8260B [non-detect < 0.50 pg/1]; <br /> I <br /> 12280.M0NIST05R14241CDJv Page 10 of 14 <br /> ©2005, Kleinfelder, Inc. November 15,2005 <br />