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C LEARVATER ' C R O U P Enda ronmenta! Sero rtes 1 Wells MWA through MW-8 will be monitored for the fourth quarter of 2002 and first and ' second quarters of 2003 Field activities will be performed in accordance with the Clearwater Field Protocols (Appendix A) During each event, all wells will be sampled for concentrations of ' TPHg, BTEX, and MTBE by EPA Method 8260B ' The results of monitoring efforts will be presented in brief reports which describe field and analytical methods, results, and project status The reports will be reviewed and signed by a California Registered Geologist at Clearwater In order to achieve some economy in labor, ' results of quarterly groundwater monitoring will be incorporated into larger reports as warranted ' 7.4 Pre-Remediation Design Pilot Testing The current network of wells at the site is sufficient to gather the required natural attenuation baseline data and determine suitability of the site for iSOC remediation This can be performed during the regularly scheduled quarterly monitoring event Test wells will be selected by relative '. location to the contaminant plume Once test wells have been selected, physical chemical parameters will be measured down-well (e g Temperature, DO, pH, Conductivity and Eh) prior to disturbing the water column by purging Following parameter measurement the wells will be ' purged as usual (Clearwater's groundwater sampling protocols are attached in Appendix A) and groundwater samples will be collected to send to the project laboratory to be tested for TPHg, BTEX and MTBE by EPA Method 8260M ' Additional sample volumes will be collected and appropriately preserved to be profiled for aerobic and anaerobic microbial parameters Aerobic microbial parameters include bacterial ' enumeration for total aerobic heterotrophic bacteria, contaminant-degrading bacteria, macronutnents (ammonia, nitrogen, o-phosphate), pH and dissolved oxygen Anaerobic parameter profiling includes enumeration of total anaerobic heterotrophic bacteria, contaminant- degrading bacteria, alternate terminal electron receptors (nitrate, sulfate, ferric iron), pH and redox potential In addition to the above tests, an appropriate volume of water will be collect and ' reserved for an aerobic microcosm study for contaminant biodegradation This is an actual bench test to document the biodegradation of the contaminants of concern at the site by naturally occurring bacteria in groundwater collected from the site wells with and without iSOC gas . infussion Clearwater's Natural Attenuation Protocols are attached in Appendix A ' ZB178C CAP 21 November 20,2002