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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 federal and state laws, regulations, plans, or policy are held to be equivalent to references to the Discharger herein. B. The Facility discharges wastewater to the Stockton Diverting Canal, a water of the United States, tributary to the Calaveras River within the Calaveras River Watershed. The Discharger was previously regulated by Order R5-2014-0013 and National Pollutant Discharge Elimination System (NPDES) Permit No. CA0081787 adopted on 7 February 2014 and expires on 1 March 2019. Attachment B provides maps of the area around the Facility. Figure B-2 provides a map depicting the Facility location, the locations of receiving water monitoring points RSW-001 and RSW-002, and discharge point EFF-001, Figure B-2 provides a map depicting the Stockton Diverting Canal, Discharge point EFF-001, and upstream receiving water flow monitoring station MRS (USACE), and Figure B-3 provides a Site Plan of the Facility. Attachment C provides flow schematics of the Facility, Figure C-1 provides an Overall System Process Flow Diagram, Figure C-2 provides an Electrochemical Precipitation System Flow Diagram, Figure C-3 provides an Ion Exchange System Flow Diagram, and Figure C-4 provides a Groundwater Extraction and Equalization Flow Diagram. C. The Discharger filed a report of waste discharge (ROWD) and submitted an application for reissuance of its waste discharge requirements (WDR's) and NPDES permit on 30 August 2018. D. Regulations at 40 C.F.R. section 122.46 limit the duration of NPDES permits to a fixed term not to exceed five years. Accordingly, Table 3 of this Order limits the duration of the discharge authorization. Under 40 C.F.R. section 122.6(d), States authorized to administer the NPDES program may administratively continue State-issued permits beyond their expiration dates until the effective date of the new permits, if State law allows it. Pursuant to California Code of Regulations, title 23, section 2235.4, the terms and conditions of an expired permit are automatically continued pending reissuance of the permit if the Discharger complies with all federal NPDES requirements for continuation of expired permits. II. FACILITY DESCRIPTION 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 that included a wood preservation process using solutions containing copper, chromium and arsenic. Wood preserving was discontinued at this site 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. On 28 November 1984 the Central Valley Water Board ratified a Settlement Agreement among the Department of Health Services (now Department of Toxic Substances Control (DTSC)), the Discharger, and the Central Valley Water Board. This Settlement Agreement required the Discharger to conduct a Remedial Investigation/Feasibility Study (RI/FS) 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 Central Valley Water Board staff, DTSC formally adopted the RAP on 29 August 1990. The RAP included the conceptual design of the groundwater remediation project, and the recommended groundwater remedial action for the extraction, treatment, and discharge of contaminated groundwater. A groundwater pilot study, including calcium polysulphate and ethanol injection, was initiated in June 2003 at the site to evaluate the effectiveness of in-situ reduction as a means to address mobile, chromium (VI) in the subsurface. The pilot study was conducted under Order R5-2003-0100. The DTSC is the lead agency for the site clean up. In June 2007, DTSC issued a ATTACHMENT F- FACT SHEET F-4