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• <br /> SITE CONDITIONS AND HISTORY <br /> The approximate 4-acre site lies between the Mokelumne River, the <br /> Southern Pacific Railroad tracks, and the termination of Awani <br /> Drive. At the time of this testing, the brown sand Loma surface <br /> soil had been tilled leaving furrows and scattered vegetation on <br /> lots 1 through 5 as delineated on Addendum A. Lot No. 6 had <br /> numerous piles of fill dirt which had not yet been graded. <br /> The project site has a history of having been used as a landfill <br /> for dry organic waste and construction debris from 1935 to 1955. <br /> Available information as to the tonnage and makeup of the fill is <br /> apparently unrecorded. Apparently since 1955 the site was <br /> ! intermittently used to dispose of additional organic material <br /> reportedly "tree limbs and grass clippings. " <br /> Existing preconstruction preparations consisted of the removal of <br /> the top two feet of fill present during the soils investigation by <br /> "The Foundation Engineers, Inc. " and 11J. H. Kleinfelder" I and <br /> replacement with approximately four feet of "good Lodi dirt. " <br /> This preconstruction preparation was completed approximately three <br /> years ago. The fill dirt was not compacted other than that which <br /> nominally occurs during grading. <br /> 8 <br /> TESTING PROCEDURE <br /> The following procedures were used for field testing: <br /> 1. Install driven 1/2 steel pipe wells to a depth of nine feet. <br /> The bottom two feet to be perforated every inch at right <br /> angles to the preceding perforation (approximate location <br /> depicted on Addendum B) . <br /> 2 . Barhole at approximately 50-foot intervals around perimeter <br /> of site and utilizing GasTechtor and OVA test for the <br /> presence of CH4 (approximate location depicted as Addendum <br /> _ B) . <br /> 3 . Purge driven wells by twice their volume and collect Tedlar <br /> bag samples. <br /> 1 4 . Field test well samples and submit highest concentration <br /> sample to lab for N2 , 02 , CO2 , CH4 halogenated hydrocarbons, <br /> vinyl chloride, and benzene. <br /> 4 <br /> Testing <br /> On February 29, 1988, four driven wells were installed on the site <br /> at approximate locations denoted on Addendum B. The wells were <br /> designated as Wells 1A, 2B, 3C, and 4D. Preliminary well testing <br /> with a GasTechtor Model 1314 indicated CH4 concentrations of <br /> between 350 to 400 parts per million. r- <br /> 70-Y87010 2 <br />