FIELD DOCUMENTS AND WORK PLANS 2000-2003

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TENTATIVE CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. R5-2003-XXXX WASTE DISCHARGE REQUIREMENTS FOR SPX CORPORATION MARLEY COOLING TOWER COMPANY STOCKTON FACILITY IN SITU GROUNDWATER REMEDIATION PILOT STUDY 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), a wholly owned subsidiary of SPX Corporation (hereafter collectively referred to as Discharger) submitted a Report of Waste Discharge (RWD), dated 8 November 2001, for a pilot study to evaluate the potential for in-situ treatment of groundwater containing chromium. The Discharger also submitted a(a) Supplemental Pilot Study Work Plan for In Situ Chromium Reduction at The Marley Cooling Tower Facility dated 21 January 2003 that proposed changes to the RWD, and (b) additional supporting information dated 1 and 16 April, and 1 May 2003. 2. The Discharger owns and previously operated a cooling tower fabrication plant at 150 N. Sinclair Avenue in the East Stockton Area in San Joaquin County(site). 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 the site 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. 3. The project site is shown on Attachment A, a part of this Order. The site is in Section 32, T2N, R7E,MDB&M. The project site plan is shown on Attachment B, a part of this Order. 4. The objective of the pilot study is to evaluate the(a) efficacy of in-situ hexavalent chromium reduction using calcium polysulfide and ethanol injection, (b) assess the secondary impacts of in- situ chemical reduction on groundwater quality, (c) identify design and operational factors that influence the successful performance of the in-situ chemical reduction approach, and (d) generate performance, design and cost data that can be used for design of a full-scale in-situ treatment system as a possible alternative to the current groundwater extraction and treatment system. 5. A sequence of alluvial sediments underlying the MCTC facility from the water table [(approximately 60 ft below ground surface (bgs)] to depths of at least 450 bgs comprises one aquifer. This aquifer is characterized by discontinuous lenses of sand, gravelly sand, clayey silt, silty clay, and clay. The aquifer can be divided into four hydrostratigraphic subimits: a) the shallow zone (water table to 80 ft bgs),b) the 100 ft zone (approximately 80 to 120 ft bgs), c) the intermediate zone (approximately 120 feet to depths ranging from 170 to 200 bgs) and, d)the deep zone extending from below 200 ft bgs to approximately 450 ft bgs. Groundwater generally flows in a southern direction in all zones. Groundwater velocity ranges from about 0.5 to 2.3 feet per day depending on the different zones.