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CLEAxRW`*xATER C R O U P • Env:ronmentaf Services Alconox® soap bath and double rinsed with clean tap water prior to placement in each well to prevent possible water quality influence from exterior sources, and to prevent cross contamination Groundwater elevations were derived and are tied to previously established well surface elevation data (Table 1) Before sampling, each well was purged until water quality parameters had stabilized Stabilization occurred after approximately three wetted casing volumes had been removed Prior to purging, all wells were checked for the presence of light non-aqueous-phase liquids (LNAPL), none was observed to be present in any well Stabilization measurements of purged groundwater temperature, conductivity, and pH were made and recorded on Monitoring Well Data Sheets for each well Well stabilization data are included in Appendix A Following purging, each well was allowed to recharge to at least 80% of its static water level prior to sampling Groundwater samples were obtained from each well using disposable polyethylene bailers and decanted into clean laboratory supplied bottles Samples were labeled, documented on a chain-of-custody form, and placed on ice in a cooler for transport to the project laboratory Groundwater samples were analyzed by Kiff Analytical Labs, located in Davis California, a California State-certified laboratory, for concentrations of TPHg, BTEX and MTBE by EPA Method 8260B Groundwater samples collected for MNA data were delivered to CytoCulture Environmental Biotechnology Laboratories (CytoCulture) in Richmond, California All field work was conducted in accordance with Clearwater's Groundwater Monitoring and Sampling Field Procedures and Natural Attenuation Processes and Recommended Monitoring Guidelines included in this report as Appendix B ZB178C/4Q03 Monitoring Rpt 5 January 29,2004