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On 5-28-98, six borings through the hold-down slabs were accomplished and two of the <br /> needed six samples were obtained before inclement weather forced the delay of <br /> • obtaining additional samples The weather conditions delayed any activity in the <br /> ' excavation until 6-2-98, at which time the four remaining samples and one composite <br /> sample were obtained for analysis Also, at this time an apparent area of contamination <br /> in one comer of the excavation was further excavated to determine the extent of the <br /> contamination, This contamination was subsequently found to be confined to the one <br /> area of the excavation See attached map for contamination location Due to the fact <br /> that contamination was found only in the one area, and, after conferring with A K Jain <br /> of the Real Estate Services Division, over-excavation of the area was not deemed <br /> necessary Excavated soil was stockpiled at the area to the northeast of the helicopter <br /> pad area and subsequently brought down to a two foot lift <br /> Excavation was then back-filled using sand to a height of eight inches from grade, <br /> compacted to a 95% compaction rate (see attached compaction report), and covered <br /> with reinforced concrete as per specifications of the contract <br /> Based on the enclosed results and witnessed work, we recommend and request that <br /> your department provide written recommendations on the above listed site Please <br /> address that in writing to A K Jain, Project Manager at 1300 "1" St, Suite 700 <br /> Sacramento, CA 95814 Please also carbon copy myself at this office for our file <br /> Also enclosed is the complete laboratory report, sampling location map, hazardous <br /> waste manifests for the tank removal and disposal and certificate of acceptance for your <br /> file and review <br /> If we can provide you with any further information in this matter, please do not hesitate <br /> to contact me at (530) 345-8562 <br /> Best Regards, <br /> William Irwin <br /> Project Manager <br /> Hm/WEI <br /> Enclosures <br /> CC File— Stockton Army Air Support Facility <br /> A K Jain, Project Manager, Real Estate Services Division <br /> Sgt Curt Lance, Field Representative, Stockton Army Air Support Facility <br /> i <br />