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y I <br /> Vicki McCartney [EH] <br /> From: Sarah.Salcedo [ssalcedo@stratusinc.net] <br /> Sent: Wednesday, October 10, 2007 11:22 AM. <br /> To: Jim Barton <br /> Cc: Vicki McCartney[EH] <br /> - Stockton <br /> I Arco 3250 W. Hammer,Lane <br /> Subject. Parkinson's Hammer 5 , <br /> Good morning Jim and Vicki- <br /> As you may know,Stratus is providing environmental consulting services to the Parkinson's for this site. We have finally <br /> (mostly)straightened things out with the Cleanup Fund for the Parkinson's and I wanted to re-open some dialogue with <br /> you both on moving the site forward toward remediation and closure. The previous consultant(Shaw)had submitted a <br /> CAP on October 26,2004 providing a cost evaluation of severalremedial alternatives and selecting ozone sparging as the <br /> preferred remedial alternative. In a letter to Parkinson.dated May 27,2005,San Joaquin County EHD approved this CAP <br /> and concurred with Shaw's proposal to install an ozone system at the site,contingent upon the RWQCB's approval of this <br /> plan. <br /> data collected in.the, few <br /> We have reviewed the site and the groundwaterast ears since the CAP was written and <br /> years <br /> approved,and although concentrations have decreased significantly since that time;we concur that ozone sparging could <br /> be a good choice for remediation at the site. Further,at the property immediately adjacent(east)of the site at 3202 <br /> Hammer Lane,ozone sparging has been successfully ongoing for more than three years(May 2004). Because of the <br /> already-implemented ozone sparging on the adjacent parcel,I would assume there would be little need for geochemical <br /> testing for valence state conversions of 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 site. This work plan would <br /> j lay out a plan for the installation of several sparge wells and provide details on the design,permitting,equipment, <br /> monitoring and reporting plan,and implementation schedule for the ozone system: Depending on our evaluation during <br /> the preparation of this work plan,we may propose limited-duration ozone remedial events using a mobile unit,rather <br /> than the installation of a permanent system. If either the Water Board or SJC would like to have a meeting to more <br /> thoroughly discuss the site and how we can proceed from here,we would be happy to do that as well. <br /> i <br /> i <br /> Please let me know your thoughts on this,as well as any specific concerns or.requirements that the RWQCB has related to <br /> ozone sparging at this site. 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)31.3-9966 voice <br /> (530)676-6005--fax <br /> I <br /> I <br /> 1 <br />