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V �.1 a commonly used abandonment procedure'in years past- and although frequently done in conformance with local regulations, this method is known to leave voids which may contain residual product. Although several sources provided conflicting information as to the date of abandonment of the fuel tanks, it is believed that this occurred approximately five years ago. Immediately North, to the rear of Bill's Bait Shop lies a 3' wide, 4' deep trench which extends from the eastern property line, West to the western property line along Fresno Avenue. ,r The trench then continues North along the East property line. The largest portion of the 1789 site is occupied by a long, narrow asphalt paved parking lot which rests North of the bait shop. This area was formerly an alfalfa field. The Linde Division of the Union Carbide Corporation once occupied the 1681 site. A portion of the Linde facility is reputed to ti have been used as a disposal site for industrial waste materials, however, this area presently lies fallow- having only been cut and tilled for fire control for the past several years. As a result, there are no surface features which might serve to support the contention that a disposal facility once existed on site. Sites within the area upon which significant contamination events are known and/or believed to have occurred are: 1) 1405 South Fresno Avenue- a site which has been occupied by Tillie Lewis Foods, Ogden Foods, and Pet Foods. Health District records indicate that a 40,000 gallon concrete vault was demolished at this facility and soil beneath excavated to a depth of thirty feet with the subsequent removal of 10,000 cubic yards of soil contaminated with #5 fuel oil. Significant volumes of groundwater were apparently extracted to facilitate the soil excavation process. Sampling of three groundwater monitoring wells on March 9, 1988 revealed only low levels of petroleum hydrocarbons within Monitoring Well #1. Subsequent analyses of groundwater samples acquired at this site apparently failed to reveal any detectable levels of petroleum hydrocarbons within groundwater. Also removed from this site were one 1000 gallon underground regular gasoline storage tank and one 300 gallon underground unleaded gasoline storage tank. Data acquired on April 8, 1987 showed groundwater moving in a northerly direction across the site; while gradient was found to be to the Northeast on February 16, 1988. 2) The Holt Bros. Tractor Company, located 1/8 mile East of 1789 Charter Way was identified as a contaminated