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M <br /> 2 CONCLUSIONS AND RECOMMENDATIONS <br /> # Based on the scope of work performed during this investigation the following conclusions <br /> were developed: <br /> I <br /> f' 1. An undetermined amount of waste oil has been allowed to periodically overflow <br /> i from the facility's 200 former gallon underground tank. The tank was excavated and <br /> removed in November 1989. The tank was intact and showed only minor signs of <br /> l f deterioration. Although the age of the tank is unknown, it is believed to have been <br /> {" installed before 1970. # - <br /> Law <br /> 2. The downward leaching of the waste oil spilled from the tank has reached the water <br /> table and has contaminated the groundwater. t <br /> 3. Although the source of the contamination has been eliminated and the majority of <br /> the contaminated soils removed, the areal extent of groundwater contamination has <br /> not been established. <br /> is <br /> 4. In addition to constituents of petroleum hydrocarbons (toluene and xylene), the <br /> groundwater was also found to contain trace amounts of purgeable halocarbons <br /> (solvents) specifically 1,1-dichloroethane and 1,1,1-trichloroethane. <br /> z <br /> 5. Because of the low concentration of the compounds found in the groundwiliter,there <br /> t" is no immediate threat to public health and welfare. Based on the location of the <br /> tank excavation and the age of the tank it is possible however that the contaminar° <br /> plume has migrated off-site. <br /> *� Murray&Associates recommends the initiation of a program to determine the areal extent <br /> of both the groundwater contamination-and_the-retnainingsoil-contamination:Specifically — --- <br /> s this program should include: <br /> =1 <br /> 4a. <br />