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KLEINFELDER I EXECUTIVE SUMMARY The City of Lodi Landfill received waste composed of lawn trimmings, leaves, tree stumps, and construction debris (concrete, asphalt, metallic slag, and rock) from approximately 1 1935 to 1955. The e site is approximately 3.7 acres in size and currently appears to contain refuse mixed with,soil to a maximum depth of about 20 feet. Under the provisions of Section 13273 of the California Water Quality Act, a Solid Waste Assessment Test must be performed at all landfills, except those that qualify for and request an exemption under the criteria of Section 13273.1. To assess whether the site is eligible for this exemption, Kleinfelder performed a preliminary investigation designed- to assess whether the landfill is-likely to leak or be leaking hazardous waste. Like the SWAT this preliminary investigation tested the waste, vadose zone, ground water, and surface water for evidence of leakage. In September 1988,Kleinfeldercollected samples of the waste and vadosezone from four AN& borings through the landfill. e' elder also installed .ands ampled one well within the landfill and sampled the Mokelumne River upstream and downstream of the landfill. Visual observations made during this phase of work and previous. phases indicate that approximately 60 to 70 percent of the fill is largely (at least 90 percent) composed of soil. Approximately 30 percent of the filled area appears to contain layers of disposed wastethat are 15 to 85 percent refuse. Based on these estimated volumes and concentrations, it appears that approximately 25,000 cubic yards of waste was disposed at this site. 'No volatile organic compounds were detected in samples of the waste,vadose zone, ground water, or surface water collected in this investigation. Low concentrations of total petroleum hydrocarbons (27 to 94 mg/kg), analyzed by EPA Method 418.1,were detected in the fill and vadose zone below the fill. The samples from the fill had slightly higher concentrations of total petroleum hydrocarbons than did samples from below the fill. These results may indicate the presence of heavier, nonvolatile hydrocarbons or they may indicate the presence of bacteria that are digested by the aggressive freon extraction method used by Chemwest Analytical Laboratories. 137-88-1663 1