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Jim Barton �•+ <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> California Regional Water Quality Control Board Central Valley Region, 11020 Sun Center <br /> Drive, Suite 200, Rancho Cordova, CA 95670 office (916) <br /> 464-4615 <br /> fax (916) 464-4704 <br /> >>> "Sarah Salcedo" <ssalcedo@stratusinc.net> 10/10/2007 11:22 AM >>> <br /> Good morning Jim and Vicki- <br /> As you may know, Stratus is providing environmental consulting services to the Parkinson's <br /> for this site. We have finally (mostly) straightened things out with the Cleanup Fund for <br /> the Parkinson's and I wanted to re-open some dialogue with you both on moving the site <br /> forward toward 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 selecting ozone <br /> sparging as the preferred remedial alternative. In a letter to Parkinson dated May 27, <br /> 2005, San Joaquin County EHD approved this CAP and concurred with Shaw's proposal to <br /> install an ozone system 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 few years since <br /> the CAP was written and approved, and although concentrations have decreased significantly <br /> since that time, we concur that ozone sparging could be a good choice for remediation at <br /> the site. <br /> Further, at the property immediately adjacent (east) of the site at 3202 Hammer Lane, <br /> ozone sparging has been successfully ongoing for more than three years (May 2004) . <br /> Because of the already-implemented ozone sparging on the adjacent parcel, I would assume <br /> there would be little need for geochemical testing for valence state conversions of <br /> chromium, bromine, etc and/or pilot testing of this technology. <br /> I would like RWQCB's approval to submit a work plan. to proceed with ozone sparging at this <br /> site. This work plan would lay out a plan for the installation of several sparge wells <br /> and provide details on the design, permitting, equipment, monitoring and reporting plan, <br /> and implementation schedule for the ozone system. Depending on our evaluation during the <br /> preparation of this work plan, we may propose limited-duration ozone remedial events using <br /> a mobile unit, rather than the installation of a permanent system. If either the Water <br /> Board or SJC would like to have a meeting to more thoroughly discuss the site and how we <br /> 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 concerns or requirements <br /> that the RWQCB has related to ozone sparging at 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 />