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_ WORK PLAN POTENTIALLY CONTAMINATED SOILS EL RANCHO ROCK &SAND, INC. QUARRY RECLAMATION PAGE 2 diesel fuel, gasoline, and motor oil; de-greasers, solvents, paint thinner and other unknown compounds. It is anticipated that any potential contamination encountered during excavation will not be immediately recognizable, and must be treated as an unknown, hazardous contaminant. Type 2 Contamination. There may be potentially contaminated soils at the facility, in work areas which predate the recent plant facility operations. A scrap yard, or "bone yard" of abandoned equipment is present near the eastern edge of the property. Some equipment in this area dates from the old "Linden Aggregates" operation. Operators of the El Rancho Rock & Sand, Inc. quarry stated to Condor in 1991 that they were told to leave this equipment alone years ago, as it was part of a bankruptcy proceeding relating to the Linden Aggregates operation. Dark spotting on the ground surface in these areas appears to be indicative of old oil and diesel fuel spills. Type 3 Contamination. The operation of heavy equipment during the implementation of reclamation efforts may result in minor drips and puddles of fuels and oils. These would be indicated by minor dark surface stains. Type 4 Contamination. "Stained" and potentially surface-contaminated concrete was noted in the containment berm structure that was used to enclose above-ground storage tanks adjacent to the office trailer. Please refer to Figure 1, Site Grading Plan, for an illustration of the location of this structure. The above-ground storage tanks were removed from the site in 1993. The front berm wall of the containment berm structure was fractured and knocked over at that time. 3.0 PROPOSED METHODOLOGY This Work Plan describes the proposed methodology for documentation and remediation of any _ potentially contaminated soils or concrete encountered during earthmoving activities associated with implementation of the approved Reclamation Plan. Project management and supervision will be provided by Condor Earth Technologies, Inc., under the direction of a California Certified Engineering Geologist, on behalf of El Rancho Rock and Sand, Inc. Contractor services will be provided by Warren E. Gomes Excavating, Inc. This Work Plan was prepared at the request of Mr. Tom Gau, San Joaquin County Development Services Division, to be submitted to the Department of Environmental Health in order that any potentially contaminated materials encountered during implementation of reclamation be adequately addressed and remediated per the direction of the Department of Environmental Health.