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KLEINFELDER Text Table 4 Groundwater Elevations TOC Elevation Depth to GW GW Elevation Location msl feet BTOC feet msl feet MW-1 52.996 90.17 37.17 MW_2 50.804 83.82 33.02 MW-3 46.475 81.74 35.26 MW-4 42.450 78.86 36.41 MW-6 40.213 79.07 38.86 MW-7 45.616 82.68 37.06 MW_8 50.198* 84.40 34.20 MW_9 50.624 87.29 36.67 TOC=Top of Well Casing GW=Groundwater BTOC=Below Top of Casing msl = mean sea level *= Elevation from Top of Well Monument The groundwater flow on the site appears to be toward the east/southeast, north and northwest based on gradient calculations. There are groundwater depressions located north, east, and west of the site. • Following collection, each groundwater sample was labeled, logged on a chain-of- custody form, and immediately stored in an iced cooler. The groundwater samples were submitted to a State certified laboratory under chain of custody control to FGL Laboratories (FGL) of Stockton, California. FGL is certified to perform the requested analyses. The groundwater samples were analyzed on a standard 12-day turn around time (TAT). Approximately three to five well volumes of groundwater were purged from each monitoring well by bailing. The groundwater samples were collected as described in Appendix C-4.2. Each of the water samples collected for quantitative analyses were submitted under chain-of-custody control to a laboratory certified by the State of California Department of Health Services (DHS) for the requested analyses. The monitoring well sampling and purging logs are included in Appendix B. Equipment used for groundwater sampling was decontaminated prior to use at each sampling location by cleaning with a non-phosphate detergent wash followed by a distilled water rinse. Disposable bailers were used to collect the samples. 3.2. DEEP EXPLORATORY BORING AND ZONE SAMPLING This section describes the drilling and construction of each zone in the exploratory • boring. Water Development Company of Zamora, California, Inc drilled the boring. The exploratory boring was terminated at a final depth of 400 feet bgs. The boring was Page 9 of 20 63138.H01/ST06R312/JDZ:ly April 7,2006 ©2006 Kleinfelder, Inc.