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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION Revised MONITORING AND REPORTING PROGRAM NO. 97-229 CALIFORNIA WATER CODE SECTION 13267 FOR J.R. SIMPLOT COMPANY LATHROP FACILITY SAN JOAQUIN COUNTY The J.R. Simplot Lathrop facility consists of 341 acres of property on Howland Road at Loui Avenue in the City of Lathrop. J.R. Simplot Company (Discharger) owns and operates a fertilizer manufacturing plant, one storm water pond, and three Class II surface impoundments (Figure 1). Groundwater monitoring data collected from monitoring wells downgradient of the formerly asphalt-lined surface impoundment indicate that past discharges from the waste management units have resulted in releases of pollutants that have degraded groundwater quality. Elevated levels of total dissolved solids, consisting primarily of sulfate, sodium, chloride, nitrate, and ammonia, exceed the concentration limits established by the Water Quality Objectives for protection of beneficial uses. This pollution has impaired the beneficia use of the underground water resource. The Discharger has undertaken evaluation monitori as well as some corrective actions to monitor and re-line the impoundments to meet the liner requirements in the California Code of Regulations, Title 27, Division 2, Subchapter 3. The Discharger has performed limited field investigations to delineate lateral and vertical extent of past releases, and limited excavation of source areas. However, the potential for additional corrective actions may be warranted based on future monitoring. This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California Water Code and is necessary to delineate groundwater pollutant plumes, determA whether surface impoundments are impacting water quality, and determine whether remediation efforts are effective. Existing data from the site show the presence of total dissolved solids, nitrates, sulfates, and ammonia emanating from the property under the control of the Discharger. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer. This revised Monitoring and Reporting Program supersedes previous MRP No. 97-229. Compliance with this Monitoring and Reporting Program is ordered by Waste Discharge Requirements (WDRs) Order No. 97-229. As the owner of the property, J.R. Simplot Company is considered a "person who has discharged, discharges, or is suspected of having discharged or discharging" waste within the region. J.R. Simplot Company owns the property where the waste is located and the evidence contained in the Central Valley Regional Water Quality Control Board (Regional Water Board) files indicates that the activities at the site produced waste and those wastes are present at the site. In particular, a leak at the UN-32 tank area, an automobile collision damaging process water piT and processing equipment failure east of the ammonium sulfate plant have each caused releases of wastes since 2006. J. R. Simplot submitted a Corrective Action Work Plan and Evaluation Monitoring Reports and evaluated the pond discharge pump area and underground piping. J. R. Simplot has also performed field investigations to define the extent of these impacts. Therefore, J.R. Simplot is required to monitor groundwater, surface water impoundments; the unsaturated zone, and leachate collection systems as specified in this document. Compliance with this Monitoring and Reporting Program, and with the companion Standard Provisions and Reporting Requirements, is ordered by Waste Discharge Requirements Order No.