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.r <br /> THRIFTY OIL CO. <br /> F °C 3 1994 <br /> EN A pNMEN7 <br /> September 29, 1994 M1r1SERvtc S LTH <br /> { <br /> Ms. Linda Turkatte <br /> Public Health Services/Environmental Health Division <br /> County of San Joaquin <br /> 445 N. San Joaquin Street i w <br /> Stockton, California 95202 <br /> RE: T7td& Oil Co. Station #171 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> Monitoring Well Abandonment <br /> Dear Ms. Kirk, <br /> l � <br /> Please find enclosed an application for well destruction, California Licensed Contractor <br /> Questionnaire, check #123483 in the amount of $60.00, copy of Drillers C-57 License and <br /> Waiver in Lieu of Workers' Compensation form. These items are submitted as a first step to <br /> provide destruction of two on-site wells, MW-1 and VW-2.1 Duel to proposed tank replacement <br /> activities at the subject site, these two wells must be abandoned because of the potential <br /> encroachment from the new tanks, see attached figure. <br /> Destruction Procedure <br /> i� <br /> Monitoring wells MW-1 'and VW-2 have been constructed of 2',�inch diameter PVC casing to <br /> depths of about 60 and 50 feet below grade, respectively. -MW-1 has a screened interval from <br /> about 15 to 60 feet and VW-2 from about 15 to 50 feet. 'A portland cement grout seal exists <br /> from surface to about 12 feet below grade. Well boreholes were about 8-inches in diameter and <br /> a gravel pack of#3 sand was used. <br /> ik <br /> Thrifty proposes to abandon these wells in place using pressure grout techniques. A licensed <br /> C-57 Contractor will be used to perform the work. In generaLk the wells will be filled with <br /> portland cement grout to within 15 feet of the surface. Since new tanks will be placed in the <br /> area of wells to a depth of at least 15 feet, bentonite hole plug will be used as a temporary seal <br /> from the surface to 15 feet. During abandonment, the contractor will verify anticipated volume <br /> of grout to and actual grout and bentonite used in the field.` <br /> QO <br /> 10000 Lakewood Boulevard, Downey, CA 90240-4,w082 •(310) 923-9876 <br /> i� ij <br />