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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. R5-2003-XXXX NPDES NO. CA0081787 WASTE DISCHARGE REQUIRENIENTS FOR SPX CORPORATION MARLEY COOLING TOWER COMPANY GROUNDWATER EXTRACTION AND TREATMENT SYSTEM SAN JOAQL-L-1; COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Regional Board) finds that: 1. The Marley Cooling Tower Company(MCTC), a wholly owned subsidiary of SPX Corporation (hereafter Discharger) submitted a Report of Waste discharge, dated 24 December 1997, and applied for a permit renewal to discharge waste under the National Pollutant Discharge Elimination System (NPDES) from the Discharger's groundwater treatment plant. 2. The Discharger owns and operates a groundwater extraction and treatment system in the East Stockton Area of San Joaquin County. The Discharger previously operated a cooling tower fabrication plant at the site which included a wood preservation process using solutions containing copper, chromium and arsenic. Wood preserving was discontinued at this facility in January 1991, however past operational practices have resulted in contamination of soils and groundwater underlying the site. Soils have been contaminated with copper,chromium, and arsenic; groundwater has been contaminated with chromium and copper. The site is in Section 32, T2N,R7E, MDB&M, as shown on Attachment A, a part of this Order. 3. On 28 November 1984 the Regional Board ratified a Settlement Agreement between the Department of Health Services (now Department of Toxic Substances Control (DTSC)), the Discharger, and the Regional Board. This Settlement Agreement required the Discharger to conduct a Remedial Investigation/Feasibility Study(RLFS) to define the extent of contamination, to develop a Remedial Action Plan (RAP), and to implement all measures necessary to remediate existing site contamination. Following discussions with Regional Board staff, DTSC formally adopted the RAP on 29 August 1990. The RAP included the conceptual design of the groundwater remediation project. The recommended groundwater remedial action in the RAP includes the extraction, treatment, and discharge of contaminated groundwater. 4. To minimize dewatering of the local aquifer and to aid in flushing of contaminants, approximately 5% of the treated water may be reinjected into shallow soils in the area of a closed retort pit at 37 degrees, 58 minutes, 11 seconds latitude and 121 degrees, 14 minutes, 00 seconds longitude. The injected water is then recaptured by the groundwater extraction system. The discharge of treated water to groundwater is regulated by Discharge Specification C, a part of