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f <br /> ALTON <br /> GEOSCiENCE <br /> November 10, 1998 <br /> San Joaquin County Public Health Services Alton Project No. 3 0-013 6 <br /> Environmental Health Division_ <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> �x <br /> ATTN: MS. MARGARET LAGORIO <br /> i SITE: FORMER MOBIL BULK PLANT 04-343 ., <br /> 500 EAST GRANTLINE ROAD Noll j 2 1888 <br /> TRACY, CALIFORNIA ESV; ;A_,a— <br /> tr lel TA LE~s j.. ?l-�l <br /> RE: WORKPLAN FOR WELL DESTRUCTIONS PEr M'T/ SERVICL.D' <br /> w <br /> i Dear Ms, Lagorio: <br /> 4 <br /> F <br /> On behalf of Mobil Business Resources Corporation, Alton Geoscience submits this workplan for the <br /> k destruction of monitoring wells at the former Mobil Bulk Plant 04-343 located at 500 East Grandine <br /> Road, Tracy, California(Figure 1). <br /> Prior to the abandonment of these wells, a well destruction permit will be acquired from the San <br /> Joaquin County Public Health Services Environmental Health Division; and an encroachment <br /> permit will be acquired from the City of Tracy Department of Public Works. The San Joaquin <br /> County Public Health Services Environmental Health Division well permit application is included <br /> in Appendix A. <br /> Alton Geoscience proposes to destroy rune monitoring wells (AW-1, AW-2, AW-4, and AW-7 <br /> through AW-12) (Figure 2). These monitoring wells will be destroyed by drilling out and removing <br /> all well casing, annular seal and gravel pack,materials from the boring. Copies of the well <br /> construction details are provided in Appendix A. The monitoring wells will then be sealed with neat <br /> cement, placed from the bottom of each boring to the surface in one continuous pour using a tremie <br /> pipe. Monitoring wells AW-3, AW-5, and AW-6 will be left in place as directed by the California <br /> Regional Water Quality Control Board Central Valley Region(see letter in Appendix B). <br /> All rinsate and groundwater displaced during the destruction of these wells will be stored onsite in <br /> properly labeled drums until it is properly disposed of at a Mobil-approved licensed disposal <br /> facility. Upon completion of the well abandonments, a copy of the well destruction report will be <br /> submitted to your office for review. <br /> If you have any questions regarding this workplan, please call Ms. Cherine Foutch, Mobil Engineer, at <br /> (925)625=1173, or Mr. Matt Katen, Alton Geoscience Project Manager, at(925)606-9150, ext 103. <br /> IRVINE LIVE R M 0 R E NORTH RI D G E SAN D I E G 0 SANTA FE S P RI N'GS <br /> 30A Lindbergh Avenue • Livermore,California 94550-9503 • (925)606-9150 • FAX(925)606-9260 www.altongeo.com <br />