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G; MATPIX <br /> DETECTION MONITORING PROGRAM WORK PLAN <br /> J. R. SIMPLOT COMPANY <br /> Lathrop Plant <br /> San Joaquin County, California <br /> 1.0 INTRODUCTION <br /> Geomatrix Consultants, Inc. (Geomatrix), has prepared this Detection Monitoring Program <br /> (DMP) Work Plan on behalf of J. R. Simplot Company (Simplot) for the installation of <br /> additional DMP monitoring wells at Simplot's Lathrop, California plant. This work plan was <br /> prepared to meet detection monitoring system requirements outlined in Title 27 of the <br /> California Code of Regulations (Title 27). <br /> The facility is located on the south end of the City of Lathrop in San Joaquin County, <br /> California(Figure 1). Figure 2 shows a detailed view of the site including the locations of the <br /> existing groundwater monitoring wells, stormwater pond, and three Class II surface impound- <br /> ments (North Pond, South Pond, and West Pond). <br /> 2.0 BACKGROUND <br /> Simplot operates one stormwater pond and three Class II surface impoundments at their <br /> fertilizer manufacturing plant in Lathrop. Discharge to these impoundments is regulated by the <br /> California Regional Water Quality Control Board—Central Valley Region (RWQCB) under <br /> Waste Discharge Requirements (WDRs) Order 97-229. Simplot has established a monitoring <br /> program to regularly collect samples and water level measurements from existing groundwater <br /> monitoring wells surrounding the impoundments, to inspect and collect samples and inflow <br /> data from each impoundment and from leachate collection and recovery systems, and to collect <br /> samples from vadose-zone monitoring lysimeters. These data are reported to the RWQCB on a <br /> quarterly basis. The monitoring program is regulated by the RWQCB under the WDRs and <br /> Monitoring and Reporting Program No. 97-229, which was adopted as a part of the WDRs. <br /> The Class II surface impoundments and the associated water quality monitoring programs must <br /> also comply with the provisions of Title 27. <br /> The current groundwater monitoring network consists of four groundwater monitoring wells <br /> and six suction lysimeters. According to the WDRs, wells LP-1, LP-2, and LP-3 are <br /> considered compliance wells, and well PW-1-48 is considered a background well (Figure 2). <br /> IAPROJEC n6741.000\6741-06.doc 1 <br />