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.✓ 1./ The quality of the shallow groundwater in the west Stockton area is generally poor. The site falls well within the saline groundwater plume, the eastern extent of which is located approximately 2.2 miles east of the site. As part of their groundwater quality monitoring program, the SJCFCWCD regularly samples two supply wells from the Newark Sierra Paperboard Facility, located approximately 4,500 feet northeast of the Ranuio property. The sampled wells (1N6-l0Q7 and 1N6 -10Q10) contained very high levels of total dissolved solids (1,888 and 1,613 parts per million [ppm]), chlorides (878 and 743 ppm), and specific conductance (2,950 and 2,520 µmhos/1) during the last sampling event in the fall of 1994. These levels are all in excess of the respective Maximum Contaminant Levels (MCLs) established by the California Department of Health Services. Mr. Elmer Fowler, Supervisor of Cal Water Service, indicated that his company currently has no supply wells in that area. Furthermore, Mr. Fowler indicated that Cal Water Service has no plans to develop any supply wells in that area because they already have sufficient supplies to handle any residential or commercial developments that may occur in the future. Cal Water Service is a purveyor of public water systems in the Stockton area. Pertinent portions of the SJCFCWCD Fall 1994 and Spring 1995 reports are included in Appendix A. 3.0 BACKGROUND The site is located at the northeast corner of Charter Way and Fresno Avenue in Stockton, California. The site previously housed three underground fuel storage tanks (one 500 -gallon, one 1,000 -gallon, and one 5,000 -gallon capacity) which were reportedly operated by Signal Oil Company and Bill's Bait Shop. The tanks were reportedly abandoned in place by filling with slurry in 1981. 3.1 History of Soil and Groundwater Investigation In August 1989 Uriah Environmental of Livermore, California was retained to explore potential subsurface contaminants. A total of 12 exploratory soil borings were advanced to collect soil and water samples from beneath the site. Analytical results indicated that soil had been groun&eVanuioklosure 3