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WEST & HANSEN ENGINEERS, INC. <br /> P O Box 5891, Vacaville, California 95696 • (707) 461-1360 <br /> November 1 , 1991 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, Ca 95827-3098 <br /> Attn: Mr. Michael H. Mosbacher PE <br /> Project Engineer <br /> Subject- STOCKTON ARMY AVIATION SUPPORT FACILITY AIRCRAFT WASH <br /> PAD; 2000 STIMSON ROAD, STOCKTON 95206; SITE <br /> INVESTIGATION REPORT <br /> Dear Mr. Mosbacher, <br /> West & Hansen Engineers, Inc. is pleased to submit our Site <br /> Investigation Report for the Stockton Army Aviation Support <br /> Facility, located at 2000 Stimson Road in Stockton. The site <br /> assessment presented in this report was based on the scope of work <br /> described in our Site Assessment Workplan dated February 4 , 1991 <br /> and approved by the Central Valley Regional Board July 3, 1991 . <br /> As detailed in this report, we have recommended additional site <br /> investigation for most of the washpad system. The soil <br /> contamination encountered during our sub-surface exploration was <br /> more extensive than originally suspected. <br /> The California Department of the Military is currently in the <br /> process of contracting for washpad removal . We believe the soil <br /> contamination under the pad can be adequately and expeditiously <br /> remediated during that project . Our detailed recommendation for <br /> washpad remediation is presented in this report. <br /> For any additional information please contact me at ( 707 ) 451 -1360 . <br /> We look forward to receiving your comments on our report. <br /> Yours truly, <br /> &tc" _ Z'Li, <br /> Brian W West PE <br /> RCE CA 32319 (exp. 12/31 /92 ) <br /> West & Hansen Engineers, Inc. <br /> BWW/es <br /> cc : Mike Golden, OSA <br /> Anne Debevec, CMD <br /> SGT. Curt Lance, Stockton AASF <br />