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.i, <br /> Harding Lawson Associates <br /> Nil 11 4 <br /> April 24, 1998 <br /> 40344.01 <br /> Margaret Lagorio, Supervising REHS <br /> San Joaquin County Public Health Services <br /> i <br /> Environmental Health Division i <br /> 304 East Weber Avenue <br /> Stockton, California 95202. <br /> Work Plan Addendum, Change of Driller, and <br /> Notification of Drilling Date for <br /> Limited Phase II Investigation <br /> Courtyard Tanks and Sump at Newark Paperboard Mills;.. <br /> 800 West Church Street, Stockton, California <br /> Site Code 1063 <br /> Dear Ms. Lagorio. :. <br /> On behalf of Newark Sierra Paperboard Corp. (Newark-Sierra), Harding Lawson Associates(HLA) submits <br /> this work plan addendum, notification of a change in drilling subcontractor and scheduled drilling date <br /> ± for a limited phase II investigation at the above�referenced site., HLA'.s Work Plan,Courtyard Tanks and <br /> Sump, Newark Paperboard Mills, 800 West Church Street, Stockton California was submitted to theSan <br /> Joaquin County Public Health Services, Environmental Health Division(PHS/EHD)in.response to the <br /> PHS/EHD letter dated.September_30, 1997 requiring a workplan forgadditional'investiagtion at the above <br /> site. I.A!s work plan was approved by PHS/EHD in a letter to Newark-Sierra dated January 5, 1998. <br /> At your request, HLA is notifying PHS/EHD of a change in drilling subcontractor from Gregg Drilling to PC <br /> Exploration of Roseville.California,:a California-licensed C-57 driller(License # 26556). -The rig is a <br /> confined-space auger rig and solid or hollow-stem augers will be used. Samples will becollected at: <br /> minimum five foot intervals for lithologic description-and potential laboratory analysis. Attached is a <br /> copy of an authorization letter to sign drilling permits for PC-Exploration. <br /> The field work is scheduled for April 28 1997, drilling will begin as early as 8:30 to 9:00 AM. A grout <br /> inspection is being requested for the afternoon and I will coordinate with you during the AM as to the <br /> exact time grouting will commence. Your ongoing cooperation on this project is,greatly appreciated by <br /> HLA and Newark-Sierra. If there are any questions,please do not hesitate to`call. <br /> Yours very truly, <br /> HARDING LAWSON ASSOCIATES'' <br /> Gary Haeck,Ph.D.,R.G. <br /> Project Geologist <br /> Enclosures: Well drillers authorization letter <br /> GDF/GLF/dp/G:\WP\GDH\GH40344P.339.; <br /> Engineering and <br /> Environmental Services 10265 Rockingham Drive,Suite 150,Sacramento,CA 95827 916/364-0793 Fax:(916)364-5633 <br />