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03/20/2006 14:52 FAX 760 942 5206 DUDEK & ASSOCIATES I9IUUa/UU6 <br /> Engineering,Planning, <br /> Corporate Office' <br /> &ASSOCIATES, INC. Environmental Sciences and 605 Third Street 760.942.5147 <br /> Professional Ttaa for CampltrProjects Management Services Encinitas,California 92024 Fax 760.632.0164 <br /> December 1,2005 <br /> 4502-04 <br /> Mr. Mark Clardy Mr. Douglas P. O'Neal <br /> California Regional Water Quality Control Board California EPA <br /> Central Valley Region Department of Toxic Substances Control <br /> 11020 Sun Center Drive#200 8800 Cal Center Drive <br /> Rancho Cordova, CA 95670 Sacramento, CA 95826 <br /> Re: Work Plan to Destroy Wells KS-7 and.KI-7,Kearney KPF Facility, <br /> Stockton, California. <br /> Dear Mr. Clardy and Mr. O'Neal: <br /> Dudek&Associates, Inc. (Dudek)has prepared this work plan to destroy groundwater <br /> wells KS-7 and KI-7 located on San Rafael Avenue, Stockton, CA(the Site)(Figure 1). <br /> The proposed work plan is described below. <br /> Water Development Corporation(WDC)will destroy wells KS-7 and KI-7. The wells <br /> will be destroyed according to the San Joaquin County—Environmental Health <br /> Department Well Standards, San Joaquin County Ordinance Code Section 9-11.15.6 <br /> (Appendix A). Well destruction permits will be filed with San Joaquin County— <br /> Environmental Health Department. A Health and Safety Plan was developed and will be <br /> followed by all personnel conducting field activities at the site(Appendix B). <br /> KS-7 Well Construction <br /> The total well depth of well KS-7 is 87.5-feet below land surface (bls) (Figure 2). A 4- <br /> inch Schedule 40 PVC 0.02-inch screen extends from 60 to 85-feet b1s. The 4-inch <br /> Schedule 40 PVC well casing extends from 0 to 60-feet b1s. The annular seal extends <br /> from 0 to 47-feet b1s. No. 60 foundry sand extends from 47 to 49-feet. Bentonite chips <br /> extend from 49 to 53-feet b1s. The filter pack extends from 53 to 87.5-feet b1s. <br /> KI-7 Well Construction <br /> The total well depth of well KI-7 is 122.5-feet b1s (Figure 3). A 4-inch Schedule 40 PVC <br /> 0.02-inch screen extends from 110 to 122.5-feet b1s. The 4-inch Schedule 40 PVC well <br /> casing extends from 0 to 110-feet b1s. The 16-inch diameter annular seal extends from 0 <br /> to 102-feet b1s. A 10-inch mild steel conductor casing extends from 0 to 102-feet b1s. <br /> The annular seal within the 10-inch diameter mild steel conductor casing extends from <br /> approximately from 0.5 to 90-feet b1s. No. 60 foundry sand extends from 90 to 95.8-feet. <br /> Bentonite chips extend from 95.8 to 100-feet b1s. The filter pack extends from 100 to <br /> 1254eet b1s. <br />