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I <br /> Mr. Mike Collins <br /> July 9, 1993 <br /> Page 2 <br /> [t. <br /> I <br /> • Excavated soil will be stockpiled on site, next to the existing biocells, and covered <br /> by plastic. <br /> • The geotechnical expertise of Kleinfelder, Inc. will be used to assure a safe and <br /> proper excavation. <br /> i <br /> • After confirmation that all impacted-soil has been removed from the excavation, <br /> the bottom 20 to 25 feet of the excavation will be backfilled with free-draining <br /> gravel. After placement, the gravel will be submitted to vibratory compaction for <br /> several hours to ensure settlement. The treated soil from the biocells will then be <br /> used to backfill the remainder of the excavation. ' Soil will be placed in the <br /> excavation in 1-foot lifts and compacted to proper density. Density measurements <br /> will be conducted b Kleinfelder, Inc. <br /> 1 <br /> y I <br /> • The stockpiled soil will be placed in the biocells as soon as they are empty and <br /> will be subjected to "bioremediation" as per the existing Work Plan. <br /> • <br /> Either you or another San Joaquin County representative will be contacted before <br /> any new phase of work commences at the site. <br /> Your prompt approval of this addendum to the existing Work Plan at the subject site will be <br /> L. appreciated. If you have any questions, please contact me at (916) 444-0123. # <br /> Sincerely. <br /> LBROWN AND CALDWELL <br /> k <br /> gi *y <br /> 4iceoIogist <br /> LP:Ik <br /> cc: Mr. Pat Cullen, Brown and Caldwell v <br /> Mr. Les Smith, Kause Construction <br /> Brawn and Caldwell 7058�REPORMW ORK-PL.N-AD D <br /> { <br /> L�_nsultants <br />