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Environmental Sciences and 605 Third Street 760.942.5147 &ASSOCIATES,INC. Engineering,Planning, Corporate Office- Professional Tk.,fP,CP-P[,I Projr,rs Management Services Encinitas,California 92024 Fax 760.632.0164 December 1, 2005 4502-04 Mr.Mark Clardy Mr. Douglas P. O'Neal California Regional Water Quality Control Board California EPA Central Valley Region Department of Toxic Substances Control 11020 Sun Center Drive#200 8800 Cal Center Drive Rancho Cordova, CA 95670 Sacramento, CA 95826 Re: Work Plan to Destroy Wells KS-7 and KI-7,Kearney-KPF Facility, Stockton, California. Dear Mr. Clardy and Mr. O'Neal: Dudek&Associates, Inc. (Dudek) has prepared this work plan to destroy groundwater wells KS-7 and KI-7 located on San Rafael Avenue, Stockton, CA(the Site) (Figure 1). The proposed work plan is described below. Water Development Corporation(WDC) will destroy wells ICS-7 and KI-7. The wells —_ - --will-he destroyed accorclug to than Joaquin oun =Envaro#mental Health Department Well Standards, San Joaquin County Ordinance Code Section 9-11.15.6 (Appendix A). Well destruction permits will be filed with San.Joaquin County— Environmental Health Department. A Health and Safety Plan was developed and will be followed by all personnel conducting field activities at the site(Appendix B). KS-7 Well Construction The total well depth of well KS-7 is 87.5-feet below land surface (bls) (Figure 2). A 4- inch Schedule 40 PVC 0.02-inch screen extends from 60 to 85-feet b1s. The 4-inch Schedule 40 PVC well casing extends from 0 to 60-feet bls. The annular seal extends from 0 to 47-feet bls. No. 60 foundry sand extends from 47 to 49-feet. Bentonite chips extend from 49 to 53-feetb1s. The filter pack extends from 53 to 87.5-feet bis. KI-7 Well Construction The total well depth of well KI-7is. 2.5-fe tbls (Figure 3). A 4-inch Schedule 40 PVC 0.02-inch screen extends from 110 tol22.5= eet bls. The 4-inch Schedule 40 PVC well I asing extends from 0 to 110-feet bls. The 16-inch diameter annular seal extends from 0 to 102-feet bls. A 10-inch mild steel conductor casing extends from 0 to 102-feet bls. The annular seal within the 10-inch diameter mild steel conductor casing extends from approximately from 0.5 to 90-feet bls. No. 60 foundry sand extends from 90 to 95.8-feet. Bentonite chips extend from 95.8 to 100-feet bls. The filter pack extends from 100 to 1254eet bls.