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r <br /> I .. <br /> 100 Pine Street. 10th Floor <br /> San Francisco. CA 94111 f w; <br /> C4157 434-9400 FAX C4151 434-1365 f;3 13sf s.`#a I AL HE iy�IUC -�#1 GEOMATRIX <br /> s Fi 7 <br /> 17 April 1997 9 7 A P:, r=, <br /> Project C2677 47. 52 <br /> Mr. Mike Infurna , <br /> San Joaquin County Public Health Services <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Well Destruction <br /> Dividend Property <br /> Tracy,California <br /> Dear Mr. Infurna: <br /> On behalf of Chevron Pipe Line Company (CPL), Geomatrix Consultants, Inc. (Geomatrix),over- <br /> saw the,destruction of all'19 groundwater monitoring wells'at the subject site on 7 April 1997. <br /> The destructions were performed by Gregg Drilling and Testing,Inc. under a permit from your <br /> office. Destruction was accomplished by overdrilling the casing and annular fill materials,pulling <br /> the casing from the ground, filling the boreholes to within.3 feet of the ground surface with ben- <br /> tonite chips, hydrating the bentonite,and filling the°upper 3 feet of the borehole with soil. These <br /> well destruction procedures and any deviations from procedures described in the Geomatrix Well <br /> Destruction Work Plan, dated 1 November 1996, were authorized by your office prior to destroy- <br /> . .*. r t.r_ .. <br /> ing the wells. <br /> As you know, in a 11 October 1996 letter to CPL the Regional Water Quality Control Board, <br /> Central Valley Region, granted closure of the Dividend Property. It is our understanding that the <br /> completion of the well destructions, and the prior submittal of the Soil Management Plan,fulfills <br /> all current regulatory requirements of CPL with respect to environmental issues at this site. Please <br /> call either of the undersigned if you have any questions. <br /> Sincerely,_ <br /> GEOMATRIX CONSULTANTS, INC. <br /> X <br /> Michael R. Keim rtin B.Bloes <br /> Project Scientist enior Scientist <br /> NffUUWB/pp <br /> I:\W PDOCS\C2677\DESTR-ZT.DOC <br /> +Ss. 1..7fi'.'•'�i. :}Re : .i•_' �x `k i :/• .t:. ..�:' •j_ :. ... .I . t �)r f;i {. `10 •.5 :3=. <br /> cc: Katie Hower=`Che'vr`on Pipe Line Company ' <br /> of r^r^. <br /> !Wendy CohenCaliforriia Regional WaterQuahty C{ontrol`Board, Central Valley Region <br /> Geornatrix Consultants, Inc. <br /> Engineers,Geologists,and Environmental Scientists <br />