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T <br /> f � • <br /> Doug O'Neal <br /> Kearney-KPF Prove-Out Report <br /> May 14, 2003 <br /> Page 3 of 3 <br /> such that the system is able to run at the maximum flow with the maximum <br /> concentrations and meet the objectives of less than or equal to 1 µg/L for 1,4 <br /> Dioxane and non-detect for other chemicals of concern. Currently the system <br /> does not have any reserve capacity. It appears that the groundwater extraction <br /> system is not running at optimum flow and may have an impact upon the <br /> problematic air entrainment in the GAC vessel. Air entrainment is not due to <br /> hydrogen peroxide degradation because of the small amount of H202 in the <br /> aqueous phase. A check valve at the outlet may prevent air backflow to the <br /> system. <br /> If it is planned to operate the system at these higher flow rates or with higher <br /> concentration at some later date ESU recommends upgrading the system by <br /> addition of a reactor and maintaining full effluent pipe flow to prevent air <br /> entrainment at the carbon vessel. Maintaining full flow in the pipes can be <br /> accomplished by such upgrades as reducing effluent pipe size or addition of <br /> valves (i.e. gate valves, check valves, etc.) which will prevent air from entering <br /> the system. <br /> 4. Please provide copies of the chain of custody forms for the sampling events of <br /> June, July, August, October of 2002 and January and February of 2003 by Del <br /> Mar Analytical as they were not included in the report. <br /> 5. ESU concurs with the request for operating the current system in a prove-out <br /> mode to resolve the proper H202dosing and optimize influent and effluent flows <br /> rates. <br /> The evaluation and recommendation contained herein have been provided by a <br /> Professional Engineer licensed by the State of California's Board of Professional <br /> Engineers and Land Surveyors. The recommendations given to the project manager <br /> are for advice only, and do not necessarily need to be implemented if the project <br /> manager has good cause from factors additional to engineering considerations. <br /> ESU hopes that these comments and recommendations will be useful in resolving any <br /> remaining issues. If we can be of further assistance, please call me at (916) 255-6670. <br />