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KLEINFELDER ATTACHMENT A PROPOSAL/WORKPLAN REMOVAL OF DEBRIS DISPOSAL AREAS FORMER SPRECKELS SUGAR PLANT NO. 2 18800 SOUTH SPRECKELS ROAD MANTECA, CALIFORNIA 1.0 INTRODUCTION 1.1 Background Two parties are currently engaged in the transfer of ownership of the former Spreckels Sugar Plant site in Manteca, California. In support of these negotiations, Kleinfelder was retained to assess the condition of the property relative to environmental impacts and geotechnical concerns. Kleinfelder conducted a Phase I Environmental Site Assessment (ESA) of the property (Kleinfelder Job No. 20-397801.P01, dated October 18, 1996). Several potential landfill sites were located during the EPA. The presence of these sites added a degree of uncertainty to the ownership transfer negotiations and Kleinfelder initiated a separate phase of work focused on obtaining additional information about the landfill sites found during the ESA. The objective of that phase of work was to confirm (or refute) the existence of the landfills, assess the lateral and vertical extent of waste in the landfills, characterize the types of waste found in the landfills, assess if releases to the environment have occurred from the landfills, and prepare recommendations for mitigation of any on site disposal areas. Results of the investigation are contained in the report "Investigation of Suspected Landfill' Locations, Phase I ESA Recommendation No. 11, Former Spreckels Sugar Plant, Manteca, California" dated February 24, 1997. The investigation revealed two disposal areas, one containing miscellaneous concrete rubble and a small amount of a lime waste (Site B disposal area), and the second containing construction debris (Site C disposal area). Site B disposal area is approximately 11,000 square feet in area and contains an estimated 2,800 cubic yards of debris, soil and lime. Site C disposal area has a surface area of approximately 26,000 square feet and contains as estimated 8,600 cubic yard of debris. Soil samples collected beneath the Site C disposal area did not show evidence of contamination. Methane gas was detected at both disposal areas in low concentrations. The highest concentration was found in the Site C disposal area but that concentration was still below the lower explosive limit for methane. Varying amounts of near surface rubble/debris was found in other areas (Site A, Site D, Site E) but the debris does not appear to be extensive enough to be classified as a disposal area. 20-3978-O1.W36/2017P117 Page 1 of 0 1997,Kleinfelder,Inc. September 5, 1997