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CLEANUP AND ABATEMENT C. CR R5-2008-0710 HJ BAKER & BRO. INC AND THE PORT OF STOCKTON MOLTEN SULFUR PROCESSING PLANT, SAN JOAQUIN COUNTY the south of the Site at a rate of less than 5-gallons per minute. Ponded water at the truck off-loading area had a pH 3.1 SU; ponded water at the wash-down area had a pH of 4.1 SU; and water running from the truck off-loading ramp had a pH of 2.8 SU. The pH of soil samples obtained on the Site was acidic; concentrations samples had a pH of 6.2, 2.7, 2.0, 2.1, and 6.1 SU2 . On 3 December 1997, Baker filed a Notice of Intent to comply with the General Permit to Discharge Storm Water Associated with Industrial Activity (General Permit), and included the 3.8 acres of the Clay Pit and its Road 21 facility in its Notice of Intent. Central Valley Water Board issued WDID 5B39S000860 to Baker for the 3.8 acre Clay Pit and the Road 21 facility. On 10 February 1998, the Central Valley Water Board inspected Baker's Clay Pit facility and found General Permit violations. The inspection indicated that storm water was running off from the sulfur storage area, and the pH and conductivity were indicative of significant pollutants in the runoff. On 10 June 1998, the Central Valley Water Board received a letter from Baker stating that it was performing site improvements, including the installation of new berms or the raising of existing berms. At its October 2004 Central Valley Water Board meeting, the Central Valley Water Board requested that staff inspect the sulfur prill (dry bulk) facilities at the Port (i.e., Baker, Port, Martin Operating Partnership, and Metropolitan Stevedore) to determine whether the dry bulk facilities were degrading waters of the state or if they posed a threat to water quality. In a 10 February 1998 Board inspection by the Board's storm water program, field tests were performed on storm water run off for electrical conductivity and pH. The pH ranged from 2.0 to 3.9 SU, and the electrical conductivity ranged from 760 to 3,860- umhos/cm. In a June 2005 stormwater sampling event at the south drainage ditch, Baker reported a specific conductance concentration of 3,500 umhos/cm. The Board's storm water program uses 200 umhos/cm as an indicator value for specific conductance that there may be a lack of or inadequate Best Management Practices installed at the facility. On 30 March 2005, Board staff inspected the dry bulk facilities, obtained field samples, and recorded observations. Staff noted ponded sulfur-contact water within the Clay Pit (to a depth that was covering a —2-inch industrial hose); sulfur drift on bare earth in contact with ponded rainwater; groundwater that had been pumped from the Port's below ground conveyor tunnel; and that storm ditches and a sump had evidence of impact from sulfur. Board staff observed sulfur pull along Stork Road adjacent to Baker's facility. The field sample results from the February 1998, March 2005 inspections, and from the June 2005 storm water sampling event are listed below: 2 Environmental Site Assessment Proposed Lease Facility, July 1997.