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SENT BY:A 3-20-91 3:42FM ; 4158295493ti 209 836 3529:# 2 <br /> Ererconmamol Consukanrs • 6761 Sierra*r 415 829.0661 <br /> Suite D FAX 415 $29.5493 <br /> Dublin, CA 94568 <br /> March 20, 1991 <br /> File No. 0389019.01 <br /> Mr. S. Paul Verma <br /> Associate Civil Engineer <br /> City of Tracy <br /> 560 Tracy Boulevard <br /> Sacramento, California 95376 <br /> Subject: Addendum to Soil Sampling Plan <br /> for Contaminated Soil at the <br /> Tracy Airport Land Treatment Facility <br /> Tracy, Qyfornia <br /> Dear Mr. Verma: <br /> This letter should be sent to Robert A. Evans. <br /> Per your letter dated March 19, 1991, SCS Engineers (SCS) on behalf of City of Tracy <br /> (City) developed the following clarifications to the soil sampling plan dated March <br /> 13, 1990 for contaminated soil at the Tracy Airport Land Treatment facility. <br /> 1. The proposed random grid sampling scheme applies to the entire land <br /> treatment area. <br /> 2. First sampling event will be conducted by SCS upon the approval of <br /> sampling plan by Regional Water Quality Control Board (RWQCB). A <br /> schedule for subsequent sampling events will be prepared by SCS and the <br /> remediation contractor after the award of contract by the City. The schedule <br /> will be submitted to RWQCB upon completion. Seven samples will be <br /> collected during each sampling event, based on the random grid shown in <br /> Figure #3. <br /> Orcinnan Columbus Kensos City los Angeles New York Norfolk Phoenl¢ Son FronclSCo Seorde Tompo Woshingron, D.C, <br />