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CLEANUP AND ABATEMENT ORDER -2- PORT OF STOCKTON FUELS TERMINALS SAN JOAQUIN COUNTY 7. The beneficial uses of the ground water described in the Water Quality Control Plan for the Sacramento-San Joaquin Delta Basin, (5B) , (Basin Plan), include domestic, municipal , industrial , and agricultural supply. 8. Ground water beneath the Terminal Area occurs at depths as shallow as two feet, and rarely gr at than eight feet. 9. Surface water runoff from the Fuel Terminal Area is conveyed to a concrete- lined ditch which is pumped directly into the San Joaquin River. 10. Ground water contamination at the Fuel Terminal Area is present over a large area, as shown by the following facts: a. After 431 barrels of gasoline overflowed from an ARCO tank on 2 February 1981, a fire started which destroyed a 7600-barrel tank, and released its content to the ground. b. Ground water samples taken when an underground tank was removed at ST Services on 5 May 1986 contained benzene (1600 parts per billion (ppb), toluene (2000 ppb) , xylene (3100 ppb), trichloroethne (TCE) (94 ppb), and a trace of PCB' s (0.4 ppb) . Ground water samples taken when another underground tank was removed at ST Services on 4 December 1986 contained high levels of gasoline (Total Petroleum Hydrocarbons (TPH) in the ground water was at a level of 240,000 ppb; diesel level in the soil was 1900 ppb.) c. Ground water samples taken when an underground tank was removed on 1 April 1987 at Tesoro Petroleum contained trichlorofluoromethane (169 ppb) , 1,2-dichloroethane (1,2-DCA) (12.6 ppb), gasoline (18.3 mg/1 ), and diesel (1800 mg/1 ). d . Fuel leaked from pipelines connecting the Fuel Terminal Area to the docks at the Port into an excavation for a water line on 6 July 1987. e. On 25 February 1988, gasoline floating on ground water rose to the ground surface in a ditch to the west of the Time Oil facility. This prompted action by Board staff and the San Joaquin Local Health District which resulted in an investigation by three of the facility opertors at the Port. Up to three feet of gasoline was floating on the ground water. The investigation only determined the extent of floating gaso- line in the localized area at Time Oil Company, along the Southern Pacific Pipeline, and along adjacent property boundaries of Tesoro Petroleum. It was not successful in determining the source of the gasolin Time Oil has been extracting ground water containing gasoline fro 11 installed on its property. mFr-59A)A'rzts*3 WtuL >