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f� <br /> 100 Pine Street. 10th Floor <br /> San Francisco. CA 94111 GEOMATRIX <br /> C415] 434-9400 • FAX C4151 434-1365 <br /> 24 October 1997 <br /> Project No. 4097.01 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services PAYMENT <br /> 304 E. Weber Street, 3rd Floor l�1=M t7! <br /> Stockton, California 95202 OCT 2 7 1997 <br /> Subject: Destruction of Well TW-1 SAN joA.�u+rjwUNn• <br /> Hanson Property PUBUC KEALT#4 SERVICES <br /> ENVIRONMENTALI.4MTH AIVISIPt" <br /> 7750 Schulte Rd. <br /> Tracy, California 95736 <br /> Dear Mr. Infurna: <br /> This well destruction plan has been prepared on behalf of Chevron Pipe Line Company(CPL), <br /> in response to your 10 October 1997 letter to CPL. In your letter,you stated that"...further <br /> investigation at the north end of the parcel is not warranted," and that the"monitoring well <br /> currently onsite will need to be destroyed." <br /> CPL intends to destroy this monitoring well, identified as TW-1, at the Hanson Property on <br /> Friday, 31 October 1997, in accordance with San Joaquin County standards and under permit <br /> from your office. Destruction will be accomplished by overdrilling the casing and annular fill <br /> materials with 8-1/4-inch diameter augers (the same diameter used during well installation)to <br /> 1 foot below the base of the borehole,pulling the casing from the ground, and filling the <br /> borehole with cement grout to within 3 feet of the ground surface. The upper 3 feet of the <br /> borehole will be filled with native soil. Horizontal location of TW-1 will be confirmed in the <br /> field by measuring distances to the well from a known point. Well destruction services will be <br /> provided by HEW Drilling Company of Palo Alto, California. <br /> We look forward to your approval of this work plan and of the well destruction permit at your <br /> earliest opportunity. Please call either of the undersigned if you have any questions. <br /> Sincerely, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Maria C. Ledesma Martin B. Bloes <br /> Staff Geologist Senior Scientist <br /> MCIIMBB/pp <br /> IAWPDocs\4097\tw1 destr.doc <br /> Enclosure: $60 Check(Application Fee) <br /> Geomatrix Consultants, Inc. <br /> Engineers, Geologists, and Environmental Scientists <br />