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Task 4. Collect Landfill Gas for Attachment I Chemical Analysis Contractor will install five temporary landfill gas collection probes on site to a maximum depth of approximately 15 feet, at locations agreed by City and BAAQMD. Landfill gas samples will be collected from each of the five probes for the analyses of Calderon Attachment I compounds (volatile halogenated compounds), and methane, nitrogen and non-speciated total organics. The temporary gas monitoring probes will be removed after the completion of gas sample collection and holes sealed properly. Task 5. Collect Landfill Gas for Methane and Organic Content Study At twenty random grid locations on the site, Contractor will collect landfill gas samples from waste filled areas by driving a gas collection probe into the vertical center of each of the twenty identified waste areas. Gas samples will be collected using either Tedlar bags or SUMMA canisters and will be analyzed for methane, nitrogen and non-speciated total organics. A total of 15 gas samples will be collected and analyzed under Task 5 (additional 5 gas samples under Task 4 above). City will provide a backhoe and an operator at no charge to Contractor to remove cover soil and wastes, as necessary, for gas collection and waste composition study (Task 6). City will also be responsible for underground utility clearance prior to excavation, for site security, and for restoration of the site to its original conditions. Task 6. Study Waste Composition At twenty random grid locations agreed by the BAAQMD, City will remove cover soil and expose waste materials, which will be physically examined and described by Contractor. Relative percentage of composition of wastes will also be estimated At two selected locations, City will remove approximately one cubic yard of wastes from each location, place the waste in a suitable bind and dry the waste naturally. Contractor will separate the dried waste into identifiable categories, such as plastics, papers, metals, concrete, by mud, etc, and weigh the waste in each category. As stated above, City will provide a backhoe and an operator at no charge to Contractor to remove cover soil and waste for the waste composition study. City will be responsible for underground utility clearance prior to excavation, for site security, and for restoration of the site to its original conditions. City will also provide two bins to contain the excavated waste and be responsible for their drying operation and security. Exhibit A Page 2 of 3 9/26/88 Rev. 1/10/90 Rev.