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i KLEINFELDER A minimum of 48 hours after installation, the piezometers will be developed to remove fine grained particles from the well bore and to effectively increase the hydraulic radius of each piezometer. The piezometers will be developed as generally described in Appendix A.3.2. Surging along the screened interval of the well will be performed to draw the sediment from the formation into the filter pack and the well and to set the sand pack. In addition to developing the piezometers until the discharge runs relatively clear of fines, the discharge will be periodically monitored for pH, temperature, and specific conductance to record stable groundwater parameters during the development task. The development purge water will be discharged to the ground surface in such a manner as not to allow the discharge to enter any surface water body. 3.3 PIEZOMETER LOCATION SURVEY Once the piezometers have been installed, the top of each piezometer will be surveyed by a professional surveyor so that depth to groundwater measurements in the wells can be converted to groundwater elevations. The wells will be surveyed relative to a local benchmark. If a local benchmark is not available near the site, the wells will be surveyed relative to an onsite, assumed benchmark with an assigned elevation. The piezometers will be surveyed as described in Appendix A-3.4. 3.4 GROUNDWATER SAMPLING AND ANALYSIS Prior to the installation of the pressure transducers/data loggers, a groundwater sample will be collected from each of the piezometers for the purpose of gathering background water quality data. The sampling will be conducted as generally described in Appendix A- 4.2. Water level measurements will be taken in each of the piezometers prior to the sampling event in order to calculate the volume of water present in the piezometer casing. Each of the seven piezometers will be purged of three to five well volumes using a disposable bailer. The purge water generated during sampling event will be distributed to the ground surface in such a manner as not to allow the discharge to enter any surface water body. After purging, a groundwater sample will be collected from each of the piezometers. The samples will be collected using a disposable bailer and put directly into laboratory prepared containers. After collection, the seven groundwater samples will be labeled, logged on a chain-of-custody form and immediately stored in an iced cooler. The samples will be transported under chain-of-custody control to Kleinfelder's office and then transported by a courier to a laboratory, certified by the State of California, for the requested chemical analyses. 79658.GW11ST07R790/FB:ly Page 5 of 9 0 2007 Kleinfelder October 2, 2007