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3, and SB-4) to further define the extent of petroleum hydrocarbons in the soil at the site and re-sample the groundwater momtor wells per the PHS/EHD's request 22 Well Location Survey A survey of all private, commercial, and municipal wells within a half-mile radius of the site was ' conducted using information available from the California Department of Water Resources The survey indicated that a total of four wells are on record as being dniled within a half-mile radius of ' the site which include two domestic, one irrigation, and one "test hole" The well locations and owner information are presented on Figure 3 I 3.0 SCOPE OF WORK 3 1 Underground Storage Tank Removal ' On September 19, 1991 three USTs and related product dispensers and piping were replaced at the site as part of a facility upgrade The USTs consisted of one 12,000-gallon tank which contained regular unleaded gasoline, one $,000-gallon tank which contained regular leaded gasoline, and a ' 6,000 gallon tank which contained premium unleaded gasoline Visual inspection of the tanks and tank piping showed no holes or apparent signs of leakage (Canonic, 1992a) ' After removal of the USTs and theP ump islands, soil samples were collected from the tank and ' pump island excavations These soil samples were submitted for analyses for TPHg and BTEX Soil samples from the beneath the leaded gasoline tank and the pump island excavations were also ' analyzed for EDB and total lead Following tank removal and soil sampling, approximately 300 cubic yards of soil excavated to facilitate the removal of the tanks was transported offsite to ' Callahan Ranch in Red Bluff, California for treatment by aeration/bioremediation The tank pit was backfilled with the soils excavated from the new tank excavation by the contractor The fill was ' compacted to minimize settling ' TOC1434 PAR 3 N0D052.0] Mayy 31 ll 199944 ] -0 1