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• • • TENTATIVE CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. WASTE DISCHARGE REQUIREMENTS MARLEY COOLING TOWER COMPANY GROUNDWATER EXTRACTION AND TREATMENT SYSTEM AND SODIUM DITHIONITE/ETHANOL INJECTION PILOT TEST SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Regional Board) finds that: 1. The Marley Cooling Tower Company(MCTC) (hereafter Discharger), a wholly owned subsidiary of SPX Corporation submitted a Report of Waste Discharge, dated 8 November 2001, to conduct a pilot test to speed up remediation of chromium in soil and groundwater. 2. The Discharger owns and operates a cooling tower fabrication plant in the East Stockton Area in San Joaquin County. As part of the fabrication operations, the Discharger operated a wood preservation process utilizing solutions containing copper, chromium and arsenic. Wood preserving was discontinued at this plant in January 1991, however past operational practices left waste constituents in soils and groundwater underlying the site. Soils contain copper, chromium, and arsenic; groundwater contains elevated concentrations of chromium and copper. The site is in Section 32, T2N, R7E, MDB&M, as shown on Attachment A, a part of this Order. 3. The Discharger has been permitted to extract groundwater and discharge up to 0.72 million gallons per day(mgd) of treated groundwater and stone water runoff under an NPDES permit to the Stockton Diverting Canal, a water of the United States and a tributary to the Calaveras River, at 37 degrees, 58 minutes, 19 seconds latitude and 121 degrees, 13 minutes, and 34 seconds longitude. 4. The soil and groundwater remediation activities to date have included (a) excavation and off-site disposal of soils containing arsenic exceeding the recommended action levels from ditches and commercial and residential properties, (b)replacement of the synthetic liner in the bottom of the retort pit with an upgraded liner, retort fluid capture system, and a leak detection system, (c) installation and operation of a 500 gallon per minute groundwater extraction and treatment system, and (d) installation and operation of a soil flushing system. 5. A soil flushing system has been in operation for about five years around the retort pit area on the North Yard and consists of injection wells, extraction wells, monitoring wells and tubes, and lysimeters. The purpose of the soil flushing sytem is to reduce and eliminate a continuing source of hexavalent chrome to groundwater from the soils. Soil flushing operates in conjuction with the groundwater extraction and treatment system. Groundwater is pumped from the extraction wells at an average rate of 500 gpm and treated. Approximately 35 gpm (5%) of the treated water is induced by gravity into five injection wells in the unsaturated zone between 20 and 70 ft below ground level beneath the retort pit. The injected water is used to flush the unsaturated zone soil and mobilize chromium and other wood-treating chemicals to groundwater. The injected water containing the mobilized wood-treating chemicals is then recaptured by the extraction, and cycled tentative MCTC pilottest WDR 8/22/022:02 PM