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Lodi City Landfill November 16,2011 North of Awani Drive,Lodi,California Project No. 104690061 Their report stated that the northern half of Lot No. 1 received fill with a very high organic con- tent and at the time of the investigation, the material was near saturation and a strong odor was noted. It was stated that decomposition of wastes was in progress and that gasses were probably being generated which may build up locally and because the fill is not uniform gases may move laterally through the fill and distribution may be random; therefore venting systems were rec- ommended. Kleinfelder proposed to construct a gas collection system (trench filled with clean gravel) at the northern portion of the site (placed near the center of Lot 1 running in an east-west direction to within approximately 50 feet of the river) to collect gas migrating from the north onto the proposed building sites. The plate referred to in their report showing the locations of the test pits was missing. The test pit logs are confusing since they look like boring logs and state "Boring Terminated 18 foot depth, Test Pit Excavated 2-16-83." In September 1988,Kleinfelder prepared a work plan titled "City of Lodi Landfill, Preliminary As- sessment Work Plan,Lodi, California."The work plan provided the following information pertaining to the history of the site. The City of Lodi Landfill is an approximately 3.7 acre site that at that time was reported to contain refuse mixed with soil to a maximum depth of approximately 20 feet.Wastes reportedly were disposed of at the site from approximately 1935 to 1955 and included lawn trim- mings,leaves,tree stumps and construction debris(concrete,asphalt,and rock). The work plan stated that based on the small size of the site and the high concentration of sandy soil mixed with the refuse (up to 90% in places), it appeared that the site contains less than 50,000 cubic yards of refuse. "Therefore,preliminary assessment activities were proposed to as- sess the potential of hazardous wastes leaking from the landfill. If no evidence of hazardous waste in or under the landfill is found in the preliminary assessment, this site may be eligible for deletion from the list of landfills required to perform Solid Waste Assessment Tests (SWATS) un- der the provisions of Section 13273 of the California Water Quality Act." The work plan proposed to advance four soil borings and convert one boring to a groundwater monitoring well. It was proposed to collect and analyze samples of the wastes, the soil/waste in- terface, and the vadose zone underlying the landfill; collect and analyze a groundwater sample from beneath the landfill; and collect and analyze surface water samples from the Mokelumne River upstream and downstream of the landfill. In March 1988, Mandeville & Associates, A Division of Kleinfelder prepared a report titled "Gas Investigation Residential Development, Lodi, California." Their report presented findings of an investigation "...to determine if organic material deposited had produced gases as a result of decomposition, determine gas migration limits, and to sample gas to determine quan- tity/quality and major constituents."The report stated that the top 2 feet of fill present during the earlier soils investigations (The Foundation Engineers, Inc. 1982, Kleinfelder, 1983) was re- placed with approximately 4 feet of "good Lodi dirt." The removal and replacement of soils reportedly occurred approximately in 1985 and the fill dirt was "not compacted other than that which normally occurs during grading." 104690061 R Snal.dm 6