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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION CLEANUP AND ABATEMENT ORDER NO. 87-700 FOR CALIFORNIA TANK LINES, INC. AND CHEMICAL TRANSFER COMPANY SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1. California Tank Lines, Inc., and Chemical Transfer Company, (hereafter Discharger) at 3105 South El Dorado Street, Stockton, California, owns and operates a chemical transport company at said location. 2.' The Discharger is a State licensed 'hazardous' waste hauler. 3. On 23 March 1987 at approximately 0830 the Discharger phoned the State Office of Emergency Services (OES) reporting a 'hazardous' waste spill of approximately 2,600 gallons of a cupric chloride solution. The waste disintegrated a portion of the double -lined, stainless steel tanker it was stored in on-site, and allowed the 'hazardous' waste to drain onto the unpaved parking area where the tanker was stored. 4. The western portion of the site, where the spill occurred, drains into Walker Slough via an open earthen ditch and covered concrete and steel culverts. The distance from the site to the slough is approximately 1,000 feet. 5. Walker Slough combines downstream with Homestead Canal before flowing into French Camp Creek which discharges into the San Joaquin River and the Delta. 6. The beneficial uses of Walker Slough and the downstream receiving waters, including the Sacramento -San Joaquin Delta, are: municipal, agricultural and industrial water supply; recreation; esthetic enjoyment; and preserva- tion and enhancement of fish, wildlife and other aquatic resources. 7. Soil samples taken by staff during the afternoon of 23 March 1987 at the bank of Walker Slough contained copper with total concentrations as high as 8,914 mg/kg. The bank area where the samples were taken is alternately exposed and flooded by slough water resulting from tidal action. A soil sample in the earthen drainage ditch adjacent to the site contained copper at a total concentration of 6,408 mg/kg. Waste with copper levels in excess of 2,500 mg/kg are 'hazardous' waste [per Section 66699(b)] of Title 22, Division 4, of the California Administrative Code.