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. ! ERM-West,Inc. <br /> - December 19, 1995 ;cwt ` ;R sereito-mail <br /> ['l I M 1 &Wg eNto,CA 95814 <br /> E (916)444-9378 <br /> F) C i:L, 2 0(9 gY!4e 5T1?(Fax) <br /> Mr.. Harlin Knoll Ah N: cvl- <br /> -San..Joaquin County Public Health Services <br /> ! Environmental Health Division <br /> P.O. Box 388 <br /> 445 N. San Joaquin Street <br /> Stockton, CA 95201-388 <br /> - (209)468-3442 <br /> ERM <br /> Subject: Well Abandonment_ Permit <br /> Application for monitoring wells at <br /> Santa-Fe Railway Company's Scotts <br /> Avenue Facility, Stockton, <br /> -California. <br /> Dear Mr. Knoll: <br /> On-behalf of Santa Fe Railway Company (Santa Fe), ERM-West, Inc., has <br /> prepared this permit application to abandon three monitoring wells (MW-1, <br /> MW-2, and MW-3) at Santa Fe's Scotts Avenue Facility. <br /> As mentioned in your office's letter to Mr. Mick Hardin dated October 11, <br /> 1995, the Scotts Avenue site no longer requires additional investigation or <br /> monitoring. Removal or abandonment of the monitoring wells will be <br /> required as part of the site closure process. <br /> Abandonment <br /> -_-Abandonment of monitoring wells .MW=1, MW-2,and MW-3 will be <br /> accomplished by injecting cement grout into the existing PVC casing through <br /> a tremie pipe placed at-the bottom of the well casings. The wells will be filled <br /> with grout`to a depth of approximately 3 to 4 feet below ground surface. The <br /> grout mixture will consist of.the typical cement to water ratio of 5 to 7 bags of <br /> `cement per 55-gallon rnixing-drum. Based on the construction of the <br /> -monitoring wells, approximately 1.3 gallons of cement-grout will be added per <br /> foot of well. After the grout has settled and hardened overnight, the top 3 to 4 <br /> feet of casing will be cut. The remaining-opening will be filled with <br /> additional cement grout, and the surface will be restored to existing <br /> conditions at the site. <br /> i <br /> Schedule j <br /> i <br /> Abandonment of the monitoring wells will be scheduled once approval of <br /> this permit application is issued. <br /> A member of the Environmental <br /> = Resources Management Group <br />