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On March 1, 1988, twenty-four barholes were made at the site. <br /> The locations are denoted as B-1 through B-24 on Addendum B. The <br /> results of these barholes are recorded on Addendum E. <br /> On March 2 , 1988, each of the four driven wells were evacuated by <br /> use of a vacuum pump equal to twice the well volume, and then a <br /> sample was drawn into a ten-liter Tedlar bag. Each ten-liter bag <br /> was field tested for CH4 concentration and oxygen level. The <br /> results of these tests are recorded on Addendum F. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The ability to provide a quantitative analysis of methane gas <br /> production is predicated in part on the amount of organic <br /> materials present, temperature, moisture content, and makeup of <br /> the organics present. Absent these data some tentative <br /> conclusions can be drawn from the installation of drilled wells <br /> with static or dynamic testing. The preferred method would be to <br /> analyze data from each of these sources. <br /> In order to evaluate this site, several assumptions had to be <br /> made which are as follows: <br /> 1. Based on the river elevation, the depth of the fill is <br /> estimated to be between 20 and 30 feet. <br /> 2 . Based on the total of eleven pits excavated by "The <br /> Foundation Engineers Inc. " and 11J. H. Kleinfelder", there are <br /> no locations of highly concentrated organic materials. <br /> 3 . During the period this landfill was in operation, the <br /> preferred method of disposal of a large portion of organics <br /> was on site burning. <br /> 4 . Sketchy history of this site indicates majority of disposed <br /> waste would be of materials such as tree limbs and stumps <br /> which decompose slowly and construction debris such as <br /> concrete, etc. , which are non-gas producing. <br /> These assumptions are based on past experience, review of written <br /> logs completed at the time of the pit excavations and review of <br /> photos of the pits dug by "The Engineers Inc. " <br /> Both soils reports indicate the highest concentration of organics <br /> to be in the area depicted as lots 5 and 6 on Addendum A and B. <br /> In evaluating the data available at this time, it can be concluded <br /> that methane production is occurring at this site. The wells <br /> tested indicate the highest concentration of methane are in the <br /> area depicted as lots 5 and 6 on Addendum B. The concentrations <br /> found fall into the lower explosive level of between 12 percent <br /> and 42 percent LEL. Based on barhole, testing, it would appear <br /> 70-Y87010 3 <br />