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F F1 January 27, 2005 NOA Project Number: E04070B Fi. Page 8 Pro used Contaminant Control Measure and Timeline L ' As of January 2005, a sodium thiosulfate neutralization treatment will be utilized on the chlorinated hydrocoolers, the only identified source of free chlorine at the facility. Based on observations and calculations provided by Aqua Treat Chemicals, Inc. of San Carlos, California, appropriate volumes F1 of sodium thiosulfate will be added to the different volume hydrocoolers at their respective concentrations of free chlorine. Once non-detect levels of chlorine are achieved, the results will be recorded, and only then will the water be allowed to flow to the pond. If no free chlorine is F� discharged to the pond, no chloroform should be formed when the wastewater comes in contact with organic matter. This_procedure is described in greater detail in the Technical Report--Meter FJInstallation. Recommendations Because the facility's practices regarding metering and chlorine treatment will change considerably, the monitoring data collected for 2004 is not representative of the wastewater that will be produced in 2005. As wastewater is generated this year,it will be possible to meter the volumes and evaluate the success of the treatment program. Chloroform data will continue to be reported in future monthly reports and will be discussed in greater detail as warranted. NOA recommends that the potential for groundwater degradation be re-evaluated in January of 2006. Limitations This report was produced using information provided to NOA by several sources. Reasonable efforts were undertaken to assure the accuracy of the information provided using the standard of care within the industry at this time. However, NOA in no way warrants the accuracy or F1 completeness of the information provided to this investigation by those sources. It should be noted that when an assessment is completed without subsurface exploration or chemical screening of soil and groundwater beneath the site, as in this study,no statement of scientific certainty can be made regarding latent subsurface conditions which may be the result of on-site or off-site sources. The findings and conclusions of this report are not scientific certainties,but rather probabilities based on ^, professional judgement concerning the significance of the data gathered during the course of this investigation. This report is intended for the exclusive use of the client and the regulatory agency to which it is submitted. I ! Fil �r 1.