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MINING REVIEW OF TANK CLOSURE DATA Linden Short Stop Linden, California z 1.0 Introduc-ion Per the request of Mr. Manuel Santos, ROY F. WESTON, INC. (WESTON) has reviewed the tank closure information and data for the Linden Short Stop site located at 18974 E. Highway 26 in Linden, Califor- nia. This review was conducted in order to assess the need for addition- al site investigation/remediation activities to assure clean ' closure of the tank removal site. - - 2.0 Background The three tanks (Figure 1) at the Linden short Stop were integrity 6 tested in 1.986. At this time, no tank leaks were discovered. In;� 1987 a minor pipeline failure was discovered. This failure was repaired by the property tenant. In 1988, the tank systems were retested and a lack of integrity was encountered. A piping leak had occurred. on January 5, 1989, all three of the tanks were removed. Upon completion of the tank removal, soil samples from beneath the tank locations were collected. These samples, according to Mr. Santos, contained petroleum hydrocarbon compounds, �H so additional excavation was completed in the area of the pipeline leak to remove additional soils. These sails were stockpiled adjacent to the excavated areas. The excavation area is shown on the section drawing contained as Figure 2. After the completion of the additional excavation, soil samples were collected from the bottom of the excavation area and from the excavated soil stockpiles. A total of nine samples were collected from the excavation area and eight samples were collected from the soil stockpiles. The samp?e'_Collection locations are shown on the field sampling logs presFcnted in Appendix A. Each sample collected was analyzed for Total: Petroleum Hydrocarbons (TPA) , Benzene, " Toluene, Xylene and Ethy;lbenzene (BTX&E) , Ethylene dibromide (EDB) , f Or anolead and Total Leed. These results are form in Table 1. The analytical reports are presented in tabular Y p presented in Appendix B. 3.0 Site Soil Classification kr� Due to the fact that no geologists were on-site during the tank removal program, the only available daita regarding the site Goil k characteristics is the well log for thei on-site well located within close proximity to the tank removal area. The data presented- - - ---- -" ---within-the-well-installation log (Appendix C) s twaransformed to comply with the uniform soil classification. system. The data (presented in Table 2) isnot as complete as is desirable, but is representative of the on-site conditions. Therefore the presents- - 1 - �t: