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i. <br /> KLEINFELDER <br /> 5 MONITORING RESULTS <br /> r' <br /> The depth to groundwater was measured in each monitoring well included in this event. <br /> The depth to groundwater measurements were converted to MSL elevation to estimate <br /> the groundwater gradient. <br /> The eight groundwater samples were submitted under chain-of-custody procedures to <br /> Sequoia Analytical Laboratories of Sacramento, California. Table 2 is a summary of the <br /> analytical results for groundwater. The chain-of-custody forms and laboratory analytical <br /> i reports are included in Appendix C. <br /> 5.1 WATER LEVELS <br /> On dune 20, 2005, 20 monitoring wells and 3 piezometers were sounded for depth to <br /> groundwater. The depth to groundwater ranged from 43.40 feet below the top of the <br /> well casing (MW-DIS-11 s) to 52.64 feet below the top of the well casing (MW-DIS-15). <br /> Groundwater elevations for the monitoring wells ranged from -32.09 feet MSL (MW-DIS-5 <br /> and MW-DIS-6) to -33.16 feet MSL (MW-DIS-13). The groundwater gradient was <br /> estimated to be southeast and relatively flat, ranging from 0.0006 ft./ft. between MW-DIS-6, <br /> MW-DIS-10, and MW-DISH to 0.0008 ft./ft between MW-DIS-10, MW-DIS-12, and MW-DIS-13. <br /> Plate 3 shows the interpreted groundwater elevation contours. Table 2 presents the <br /> recorded groundwater elevations on June 20, 2005 and past monitoring events. <br /> 5.2 ANALYTICAL METHODS AND REPORTED RANGES <br /> Eight groundwater samples were collected and submitted for analysis. The following is <br /> a list of the requested analyses and the reporting limits for groundwater samples <br /> obtained from the monitoring wells this quarter; <br /> • Total Petroleum Hydrocarbons as gasoline <br /> by EPA Method 8015M/8021 B [non-detect < 50 pg/1]; <br /> • Benzene by EPA Method 8015M/8021 B [non-detect < 0.50 lag/11; <br /> Toluene by EPA Method 8015M/8021 B [non-detect < 0.50 pg/1]; <br /> • Ethylbenzene by EPA Method 8015M/8021 B [non-detect < 0.50 fag/11; <br /> i • Xylene by EPA Method 8015M/8021 B [non-detect < 0.50 tag/1]; <br /> • 1,2-DCA by EPA Method 8260B [non-detect < 0.50 pg/I to 8 pg/11; <br /> EDB by EPA Method 8260B [non-detect < 0.50 pg/1]; <br /> • TBA by EPA Method 8260B [non-detect < 5.0 tag/1]; <br /> MTBE by EPA Method 8260B [non-detect < 0.50 tag/1]; <br /> DIPE by EPA Method 8260B [non-detect < 0.50 pg/1]; <br /> 12280.M0N/ST05R803/JZ:Iv Page 10 of 15 <br /> ©2005, Kleinfeider, Inc. July 25,2005 <br />