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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION CLEANUP AND ABATEMENT ORDER NO. 92-707 AMENDING CLEANUP AND ABATEMENT ORDER NO. 91-720 FOR SOUTHERN PACIFIC TRANSPORTATION COMPANY TRACY YARD, SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1 . On 9 July 1990, the Executive Officer issued Cleanup and Abatement Order No. 90-715 for Southern Pacific Transportation Company (hereafter Discharger), for soil and ground water pollution at the Tracy Yard in San Joaquin County. 2. On 30 April 1991 , the Executive Officer issued Cleanup and Abatement Order No. 91-720, Amending Cleanup and Abatement Order No. 90-715 for Southern Pacific Transportation Company. 3. On 18 July 1991 , the State Water Resources Control Board adopted Resolution No. 91-65, Amending Central Valley Regional Water Quality Control Board Cleanup and Abatement Order No. 91-720 for Southern Pacific Transportation Company. 4. On 8 January 1992, the Executive Officer issued Monitoring and Reporting Program No. 92-801 for Southern Pacific Transportation Company, Tracy Yard, San Joaquin County. 5. This Order amends and incorporates all the findings in Order No. 91-720. 6. Order No. 91-720 remains in full force and effect except as modified by this amending Order. 7. Monitoring of soils and ground water at the Tracy Yard has shown the following pollutants to be present in excess of background levels, and in many cases, in concentrations in excess of applicable water quality objectives: petroleum-derived fuels; chromium; lead; acetone; bromodichloromethane; 2-butanone; benzene; chloroethane; 1 ,3-dichlorobenzene; 1 ,1-dichloroethane; 1 ,1-dichloroethylene; cis- and trans-l,2-dichloroethylene; dichloromethane; ethylbenzene; isopropylbenzene; naphthalene; tetrachloroethylene; toluene; 1 ,1 ,1-trichloroethane; trichloroethylene; trichlorofluoromethane; vinyl chloride; and xylenes. 8. Pollutants known to exist in petroleum-derived fuels include: total petroleum hydrocarbons (gasoline, diesel, kerosene, motor oil and heavier ranges); benzene;