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The source of this contamination could be very old from such <br />things as oiled concrete forms, etc. <br />The 550 -gallon tank being discussed herein was installed in 1950 <br />in a concrete pit. The tank was replaced by a new 2000 -gallon <br />tank when a larger generator was installed in 1974. The 550 - <br />gallon tank has been empty and not used for 14 years. <br />Soil samples were taken at 20' (bottom of tank) and at 28'. The <br />contamination has had at least 14 years to migrate 8' to 28' <br />deep. This has not occurred. <br />CONCLUSION: <br />The contamination at the end of the tank probably occurred during <br />construction in 1950 or some time before 1974 and has been there <br />14 to 38 years. <br />LUFT Table 2-2 evaluation yields 44 points. <br />1. <br />Minimum <br />depth to groundwater <br />55-20' = 351+ <br />5 <br />2. <br />Fracture <br />in subsurface <br />None <br />10 <br />3. <br />Average <br />precipitation <br />10"-25" <br />9 <br />4. <br />Manmade <br />conduits <br />None <br />10 <br />5. <br />Unique site <br />features <br />None <br />10 <br />TOTAL 4� <br />Maximum allowable TPH Level (PPM) = 1000 <br />Based on LUFT Table 2-2 and that the contamination has been there <br />for a minimum of 14 to 38 years, it is recommended that it be <br />left in place and that the tank be filled in place. <br />If there are any questions or additional information is needed, <br />please do not hesitate to contact me. <br />Sin,qerely, <br />James Elder, P.E. <br />Attachments: <br />Vicinity Map <br />Site Plan <br />Borehole Location Map <br />Laboratory Report dated October 6, 1988 <br />Laboratory Report dated October 21, 1988 <br />Copy of application to fill tank in place <br />