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GE—O OMA7'RIX CORRECTIVE ACTION WORK PLAN Lathrop Facility San Joaquin County, California 1.0 INTRODUCTION The J. R. Simplot Company(Simplot) Lathrop facility(facility) is located in the southern part of the City of Lathrop, California, east of Interstate Highway 5 (Figure 1). Simplot operates one storm water pond and three Class II surface impoundments at the facility(Figure 2). Discharge to these impoundments is regulated by the California Regional Water Quality Control Board—Central Valley Region(RWQCB)under Waste Discharge Requirements Order No. 97-229 (WDRs) (RWQCB, 1997a) and the associated Monitoring and Reporting Program (MRP) (RWQCB, 1997b). In a February 11, 2005, letter to Simplot, the RWQCB requested that Simplot submit"a Corrective Action Program to clean up groundwater"and provide comments on a"draft revised Monitoring and Reporting Program." This report has been prepared on behalf of Simplot to respond to the Corrective Action Program(CAP)request. Simplot has separately responded to the RWQCB with comments on the draft revised MRP. This report is organized into sections addressing background information(Section 2.0), groundwater hydrogeology(Section 3.0), groundwater quality(Section 4.0),corrective action work plan(Section 5.0), and preliminary schedule(Section 6.0). References used in preparation of this report are included in Section 7.0. 2.0 BACKGROUND The following background information is summarized from a variety of facility references. The Lathrop facility is located at 16777 Howland Road in the southern part of the City of Lathrop, California. The Lathrop facility is shown on Figure 1. 2.1 LATHROP FACILITY OPERATIONS Best Fertilizers Company(Best) developed the Lathrop facility in 1952 for manufacturing fertilizers. In 1957,manufacturing of the pesticide 1,2-dibromo,3-choloropropane (DBCP)was added to facility operations. Occidental Chemical Corporation (Occidental) acquired Best in 1963. DBCP was manufactured until 1976. Simplot purchased the facility from Occidental in 1983 and currently operates a fertilizer manufacturing and warehousing facility on the property. In 1981, Occidental entered into a Stipulation and Judgment (No. CIV S-79-989 MSL) with the 1:\6000s\6741.000\Archive\6741-13.doc 1