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Mr. Inf rma <br /> 04/03/2006 <br /> Page 4 of 4 <br /> Task 4—Focused Excavation <br /> Excavation of soil which exceeds soil vapor inhalation exposure criteria will be completed in focused <br /> areas of the site, if deemed necessary based on the results of the initial field investigation tasks described <br /> above. An excavation plan, if necessary, will be provided which details the locations of excavation and <br /> objectives. The excavation plan will be prepared following the completion of Task 3 above. <br /> If you have any questions or comments regarding the contents of this letter,please contact either David <br /> Lay at(315)671-9197 or David Evans at(916) 843-1276 extension 226. <br /> Sincerely, <br /> BLASLAND,BOUCK&LEE,INC. QROFESSjnN <br /> yQ�P�,_p.FLF�Sc�F�c <br /> �/ 2 <br /> � C 65705 z A t <br /> EXP. Q s° Sw7 <br /> t <br /> David W. Lay, C.P.G. Michael P.Fleischer,P.E. s,g, CML <br /> CA4,EO���P <br /> Senior Geologist Principal Engineer <br /> DWL/mft <br /> Enclosures: <br /> Figure 1 Groundwater Flow Direction Rose Diagram <br /> Figure 2 Site Plan with Proposed Monitoring Well Locations <br /> Figure 3 Site Plan with Proposed Vapor Point Locations <br /> Attachment 1 Chevron's Soil Vapor Sampling Technical Toolkit(Version 1.4) <br /> cc: Darin Rouse, Chevron Environmental Management Company <br /> Jim Barton,Regional Water Quality Control Board <br /> John Parker,Boulevard Auto <br /> Mark Springs <br /> Robin Ringstad <br /> 08262822.dm <br /> BLASLAND, BOUCK&LEE, INC. <br /> engineers,scientists,economists <br />