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11/17/2005 12:56 2095224227 GEOLOGICAL TECHNICS PAGE 03/04 <br /> Geological TBC&MCS !AC, _ <br /> 11017'"street <br /> Modesto,Cdtfama 95354 <br /> (209)527 4119/Fm#52214227 <br /> November 17,2005 <br /> Project No.: 425.2 <br /> Project Name: George's Station <br /> George and Mei Teranishi <br /> 1600 Durham Ferry Road <br /> Tracy,CA 95304-8799 <br /> Re: Work Plan Addendum—In Situ Remediation pilot Test <br /> George's Station, 1600 Durham Ferry Road,Tracy,CA <br /> Dear Mr. &Mrs. Teranishi: <br /> On November 17, 2005 Mr. Nuel Henderson and Geological Technics Inc. (GTI) discussed <br /> ammendments to the scope of work to be performed at George's Station. GTI requests the <br /> following changes to the March 21, 2005 Interim Remedial Action Plan and June 14, 2005 <br /> Feasibility Work Plan—In-Situ Remediation Pilot Test: <br /> • Install an additional observation well for a total of two observation wells <br /> • The new observation well will be sampled in leau of sampling MW-2 <br /> • Change the locations of the sparging and observation wells as shown on the attached map <br /> • Collect up to two soil samples from each of the observation wells and analyze them for <br /> TPHg,BTEX and fuel oxygentates by EPA method 8015/8260 <br /> • Reduce the sampling interval for petroleum hydrocarbons during the pilot test from daily <br /> to every-other-day <br /> o Groundwater samples would be collected at the same interval as the Cr/Cr- <br /> sampling events reducing technician costs as well as analytical costs <br /> If you have any questions or need additional information,please contact me. <br /> Respectfully subnaitt d <br /> � (. <br /> V� <br /> Raynold L Kablanow II,Ph.D. <br /> Vice President <br /> cc: Nuel Henderson—EHD- SJC <br /> Jim Barton-CRWQCB-CVR <br /> USTCFP <br />