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r � Kennedy/Jenks Consultants Section 2: Background The Musco olive processing facility (Facility) and associated land application areas are referred to as "the Site"for the purposes of this Work Plan. The Site encompasses approximately 280 acres of property in the southwest quarter of Section 34, Township 2 South, Range 4 East and in the northeast quarter of Section 4, Township 3 South, Range 4 East. The location of the Site is shown on Figure 1. The primary features at the Site are shown on Figure 2. 2.1 Regulatory Status Summary Management of process wastewater at the Facility is currently regulated under separate Waste Discharge Requirements Orders issued to Musco by the RWQCB. WDR No. R5-2005-0024 regulates and specifies required monitoring for the surface impoundments (Title 27 ponds), to which the more concentrated wastewaters and spent brine solutions are discharged. WDR No. R5-2002-0148 and Cleanup and Abatement (CAO) Order R5-2002-0149, issued in 2002, regulate application of process wastewater to Musco's onsite land application system. After WDR No. R5-2002-0148 was issued in September 2002, Musco submitted a number of technical reports documenting its activities and improvements. Many of these activities were summarized in the Background Groundwater Quality Report(Kennedy/Jenks 2004a) and Report of Waste Discharge (Kennedy/Jenks 2004b) submitted to the RWQCB in July 2004. More recent technical submittals include the Pilot Study Results Summary Report (Kennedy/Jenks 2006) submitted in August 2006, an Amended Conceptual Compliance Plan (Stoel Rives 2006) submitted to the RWQCB in September 2006, and an Amended Report of Waste Discharge in January 2007 (Kennedy/Jenks 2007). Following a series of meetings with Musco representatives, on 4 June 2007, the RWQCB issued a letter requiring Musco to complete several tasks, including preparation of a Work Plan for characterization of soils underlying the 1-MG pond (RWQCB 2007). 2.2 1-MG Pond The 1-MG pond was originally designed in 1983 as a fresh water retention pond; however, it was never used as such. The design drawing for the 1-MG pond indicates the dimensions of the pond were 90 feet by 70 feet, with sloping sides. According to Musco's records, the original floor of the pond was at an elevation of 310 feet AMSL and the top of the bank is at 321 feet AMSL. Between 1992 and completion of the 84-MG reservoir in 2002, the 1-MG pond was used for storage of reclaimed process water. After construction of the 84-MG reservoir, the 1-MG pond was used as a pumping station for transferring water from the Facility to the reservoir and as a convenient location for solids separation prior to discharge of water to the reservoir. Based on water quality monitoring data from well MW-5, Musco has concluded that the 1-MG pond may be leaking, possibly as a result of repeated dredging over a period of several years (Kennedy/Jenks 2007). Accordingly, in 2007 Musco plans to replace the 1-MG pond with an aboveground tank. Work Plan for Soil Characterization, Page 2 Musco Family Olive Company, Tracy, California