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EXHIBIT A SCOPE OF SERVICES Task 1. Prepare a Study Plan Contractor will prepare a study plan for review and approval by City and Bay Area Air Quality Management District (BAAQMD). The plan will present detailed methods and procedures for the field studies of Tasks 2 through 6, discussed below, following Rules and Guidelines from BAAQMD. A project -specific health and safety plan will also be prepared as part of the study plan in accordance with federal Occupational Safety and Health Administration (OSHA) regulation 29CFR 1910.120. The health and safety plan will be followed during field work. City will provide Contractor a site base map showing the dimensions of existing site improvements for the preparation of the study plan. Task 2. Conduct Perimeter Gas Migration Study Contractor will install up to 5 temporary landfill gas monitoring probes around the east and south boundary (inboard) of the site, immediately outside the waste area, at intervals no greater than one thousand feet. The gas probes will be approximately 10 feet below ground surface. Landfill gas samples will be collected from each of the five monitoring probes for the analysis of methane and oxygen gases. The temporary gas monitoring probes will be removed after the completion of gas sample collection and holes will be sealed properly. Task 3. Perform Surface Emissions Scan Following the approval of the study plan (Task 1), Contractor's technical staff will perform a surface emissions scan on the site. This task involves walking a grid pattern on site with an organic vapor analyzer (OVA) equipped with a flame ionization detector (FID) to measure methane concentration near the surface. The OVA will be specifically calibrated for methane analysis. Any areas with surface methane reading exceeding 1,000 ppm will be recorded. Exhibit A Page 1 of 3 9/26/88 Rev. 1/10/90 Rev.