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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION IRECEIVE , MONITORING AND REPORTING ORDER NO. R5-2015-0810 CALIFORNIA WATER CODE SECTION 13267 JUL 0 2 2015 FOR ENVIRONMENTAI. GLENN SPRINGS HOLDING, Inc. 1''r" �T',,�"'T FORMER OCCIDENTAL CHEMICAL CORPORATION_ LATHROP FACILITY, SAN JOAQUIN COUNTY This Order is issued to Glenn Springs Holding, Inc. (GSH), former Occidental Chemical Corporation (hereafter Discharger) pursuant to California Water Code section 13267, which authorizes the Executive Officer of the California Regional Water Quality Control Board, Central Valley Region (hereafter Central Valley Water Board) to issue a Monitoring and Reporting (MRP) Order (Order). The Executive Officer finds: INTRODUCTION 1. The former Occidental Chemical Corporation (OCC) facility (Site) is located at 16777 South Howland on 341 acres of land, in the town of Lathrop, San Joaquin County, Section 35, Township1 S, Range 6E (Figure 1). 2. The Best Fertilizers Company (Best) developed the Site initially and began manufacturing fertilizers at this location in 1952 OCC acquired Best in 1963 and transferred its assets including the Site to OCC Oxychem Division. OCC operated the Site as a pesticide and fertilizer manufacturing facility from 1953 until the end of 1982. In 1983 the Site and certain assets were conveyed to the J.R. Simplot Company (Simplot). Simplot continues to manufacture fertilizers at the Site and OCC retains responsibility for implementing environmental remediation of groundwater at the Site pursuant to the 1982 Stipulation and Judgment Approving Settlement (No. CIV S-79-989 MLS) with the United States and the State of California. Glenn Springs Holdings, Inc. now manages the groundwater cleanup on behalf of OCC. 3. At the Site, soil and groundwater have been impacted with various chemicals, identified below, due to past industrial activities and waste disposal practices. This pollution has impaired the beneficial use of the underlying aquifers. 4. Site investigation and cleanup activities have been ongoing since the early 1980s. Source removal (soil excavations) has been completed at some areas of the Site. Groundwater remediation (extraction and treatment) system operation commenced in 1982 and is ongoing. The groundwater treatment system is permitted to process up to 750 gallons per minute (gpm) and typically processes approximately 350 to 500 gpm. Groundwater is currently being extracted from eighteen (18)-wells and treated using granular activated carbon (GAC).