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Delta �. Environmental Consultants, Inc. 3300 Data Drive,Suite 100 Rancho Cordova,CA 95670 t 916/638-2085 FAX:916/638-8385 MAR 2 0 1991= EN'✓fn pN� March 12, 1991 p� MIT SERV C� rkj Ms. Eleanor Ratliff San Joaquin County Local Health District Environmental Health Division P.O. Box 2009 Stockton, California 95201 Subject: Work Plan For Well Abandonment Beacon Station No. 696 2448 West Kettleman Lane, Lodi, Califon iia Delta Project No. 40-90-839 Dear Ms Ratliff: Delta Environmental Consultants,Inc. (Delta),is conducting a hydrogeologic investigation for Ultramar Inc. (Ultramar),at 2448 West Kettleman Lane,Lodi,San Joaquin County,California. The investigation is intended to evaluate the extent of petroleum hydrocarbons present in the soil and ground water beneath the site. As a result of investigative work performed by previous consultants since 1985, a total of 33 monitoring and soil vapor recovery wells have been installed at thJ site. Delta has been requested by Ultramar to properly abandon eight monitoring wells which do not contain water and have been vapor-tested and shown to not be useful for soil vapor extraction. The locations of these eight wells are shown in the enclosed Generalized Site Map and include monitoring wells MW-16R, MW-17R, MW-18R, MW-22, MW-29, MW-30, MW-31, and MW-33. The property on which these wells are located is sch uled for development as a commercial retail shopping center. The development of this property will inimize the potential for infiltration of surface water into the upper aquifer zone. The site is schedulec to be graded and will be engineered to provide for surface runoff to be channeled into storm drains. lit addition, asphalt, concrete, and structures will cover a large percentage of the surface in the vicinity c f these wells forming an impermeable cap that will prevent downward percolation of water.