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SACRAMENTO Letter to Mr. Richard McCombs January S, 19°8 Page 6 contamination increases in the lower soils, aeration may not be permitted by the regulatory agencies. Until a permit has been obtained, the contaminated soil should be covered with plastic to prevent contaminant migration by rainwater runoff and the release of unpermitted air emissions. Partially filled and empty chemical storage drums were scattered about the northern portion of the operations yard, When the contents of the drums have been determined, the drums should be properly disposed of to prevent soil contamination. The presence of copper and lead in the storage pond area does not present a significant risk of environmental impairment if the metal content of the soil does not increase downwards, and if the soil passes an Extraction Procedure Toxicity Test. Additional testing nor metals may be done in conjunction with a groundwater contamination investigation. Recommendations To reduce the risk of en-�ironmental impairment, the following actions are recommended: + 87-12-1: A preliminary subsurface investigation should be conducted to determine the extent of contamination released from the underground fuel storage tank. Additional work should be based on the results of the preliminary investigation. E 87-12-2: The property owner should obtain all necessary permits from the San Joaquir, County Air Pollution Control District for aeration of contaminated soils. The permits should be acquired and treatment started as soon as possible. Until the permits are obtained, the existing pile of contaminated soil should be covered with plastic. s 87-12-3: The abundant garbage -and debris should be disposed of properly. Additionally, the contents of any partially filled storage drums should be determined, and all f . drums should be disposed of properly.