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' KLEINFELDER <br /> ' 4.3. MONITORING WELL DEVELOPMENT <br /> Following a minimum of 48 hours after installation, the monitoring wells were developed to <br /> remove silt and clay from the well bore and to effectively increase the hydraulic radius of each <br /> ' monitoring well. Surging along the screened interval of the well will be performed to set the sand <br /> pack during installation and again during the development stage. The monitoring wells were <br /> developed as described in Appendix E Section E.3.2. The discharge was periodically monitored <br /> ' for pH, temperature, and specific conductance. <br /> The monitoring wells were developed beginning on April 30, 2004. For a copy of the Monitoring <br /> Well Development Logs refer to Appendix C. The well development purge water was discharged <br /> to the land surface in such a manner as not to allow the discharge to enter any surface water body <br /> or flow back into the monitoring wells. <br /> ' 4.4. MONITORING WELL SAMPLING <br /> Groundwater was sampled on May 3, 2004, after the monitoring wells were developed . Water <br /> ' level measurements were made in the monitoring wells prior to purging and sampling the wells <br /> according to the protocol described in Appendix G Section G-4.1. The following table outlines the <br /> groundwater elevations in each monitoring well during sampling on May 3,2004. <br /> Text Table 4 <br /> ' Groundwater Elevations <br /> ELocation TOC Elevation Depth to GW GW Elevation. <br /> msl(feet) BTOC. feet msl feet <br /> -1 11.79 24.01 -12.22 <br /> -2 12.16 23.81 -11.65 <br /> -3 11.29 22.72 11.43 <br /> ' TOC=Top of Well Casing GW=Groundwater <br /> BTOC=Below Top of Casing msl=mean sea level <br /> ' Approximately three to five well volumes were purged by bailing. The groundwater samples were <br /> collected as described in Appendix G Section G-4.2. Each of the water samples collected for <br /> quantitative analyses were submitted under chain-of-custody control to a laboratory certified by <br /> ' the State of California Department of Health Services (DHS) for the requested analyses. <br /> Equipment used for groundwater sampling was decontaminated prior to use at each sampling <br /> ' location by cleaning with a non-phosphate detergent wash followed by a distilled water rinse, or <br /> disposable sampling equipment was used. <br /> 42162.1301 /ST04R854 Page 11 of 22 <br /> Copyright 2004,Kleinfelder,Inc. July 1,2004 <br /> 1 <br />