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re-open some dialogue with yo�V)both on moving the site forwardk4oward <br /> remediation and closure. The previous consultant (Shaw) had submitted a <br /> CAP on October 26, <br /> 2004 providing a cost evaluation of several remedial alternatives and <br /> selecting ozone sparging as the preferred remedial alternative. In _a <br /> letter to Parkinson dated May 27, 2005, San Joaquin County EHD approved <br /> this CAP and concurred with Shaw's proposal to install an ozone system <br /> at the site, contingent upon the. RWQCB's approval of this plan. <br /> We have reviewed the site and the groundwater data collected in the past <br /> few years since the CAP was written and approved, and although <br /> concentrations have decreased significantly since that time, we concur <br /> that ozone sparging could be a- good choice for remediation at the site. <br /> Further, at the property immediately adjacent (east) of the site at 3202 <br /> Hammer Lane, ozone sparging has been successfully ongoing for more than <br /> three years (May 2004) . <br /> Because of the already-implemented ozone sparging on the adjacent <br /> parcel, I would assume there would be little need for geochemical <br /> testing for valence state conversions .of chromium, bromine, etc and/or <br /> pilot testing of this technology. <br /> I would like RWQCB's approval to submit a work plan to proceed with <br /> ozone sparging at this site. This work plan would lay out a plan for <br /> the installation of several sparge wells and provide details on the <br /> design, permitting, equipment, monitoring and reporting plan, and <br /> implementation schedule for the ozone system. Depending on our <br /> evaluation during the preparation of this work plan, we may propose <br /> limited-duration ozone remedial events using a mobile unit, .rather than <br /> the installation of a permanent system. If either the Water Board or <br /> SJC would like to have a meeting to more thoroughly discuss the site and <br /> how we can proceed from here, we would be happy to do that as well. <br /> Please let me know your thoughts on this, as well as any specific <br /> concerns or requirements that the RWQCB has .related to ozone sparging at <br /> this site. <br /> Thanks for your time. Have a good day! <br /> -sarah <br /> Sarah O. Salcedo, P.G. <br /> Senior Geologist / Project Manager <br /> Stratus Environmental, Inc. <br /> 3330 Cameron Park Drive, Suite 550 <br /> Cameron Park, California 95682 <br /> (530) 313-9966 -- voice <br /> (530) 676-6005 -- fax <br /> 4 <br />