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Kennedy/Jenks Consultants Section 1: Introduction This Work Plan for Improved Detection Monitoring Program (Work Plan) has been prepared by Kennedy/Jenks Consultants, Inc. (Kennedy/Jenks) and Musco staff on behalf of the Musco Family Olive Company (Musco). The Work Plan is submitted in response to the letter from the Regional Water Quality Control Board, Central Valley Region (RWQCB)titled, Review of 2009 Annual Monitoring Summary Report for Class II Surface Impoundments and Detection Monitoring Program, Musco Family Olive Company, San Joaquin County, dated 9 June 2010. 1.1 General Background The Musco olive processing facility is located at 17950 Via Nicolo Road in Tracy, California. Musco has operated at this location since 1983. The facility and associated Class II Surface Impoundments 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 two Class II Surface Impoundments are located in Section 34, Township 2 South, Range 4 East. This Work Plan addresses approximately 15 acres immediately surrounding the Class II Surface Impoundments. The location of the Site is shown on Figure 1. Management of process wastewater at the facility is currently regulated under two Waste Discharge Requirements Orders (WDRs) issued to Musco by the RWQCB. WDR No. R5-2010-0025 regulates application of process wastewater to Musco's onsite land application system. 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. Musco currently monitors eleven groundwater monitoring wells associated with the Title 27 ponds. As allowed by the presence of groundwater within the wells, Musco collects and analyzes groundwater samples on a quarterly basis. In accordance with the WDRs, the analytical results are submitted to the RWQCB. Currently, nine of these monitoring wells are dry but are monitored quarterly for the presence of water and two are sampled quarterly in accordance with the WDRs. The locations of the groundwater monitoring wells are presented on Figure 2. Musco also operates an unsaturated zone monitoring network, which consists of 37 suction lysimeters. The lysimeters are installed beneath the secondary liner at depths of either five or ten feet below the bottom of the liner and are monitored semi-annually in accordance with the WDRs. The locations of the suction lysimeters are presented on Figure 3. 1.2 Objectives and Approach The objective of this Work Plan is to address comments received from the RWQCB regarding the ongoing detection monitoring systems associated with the two wastewater surface impoundments. The letter received by Musco from the RWQCB requires the following (RWQCB 2010): Work Plan for Improved Detection Monitoring Program Page 1 Musco Family Olive Company, Tracy, California A us-amupWminpW A104 Wm=wwwtg,mftV�N_27dmpof dmum.n[lreport_text-09-26.doc