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1 INTRODUCTION On behalf of Cove Contractors, Miller Brooks Environmental, Inc. (Miller Brooks), has prepared this Technical Report and Groundwater Monitoring Well Investigation Workplan for their facility located at 3242 South EI Dorado Street in Stockton, California (Site; Figure 1). As shown on Figure 2, The Central Pacific Railway bounds the southeastern length of the site; The Union Pacific Railroad bounds the western edge of the site; a metal recycling yard, Universal Service Recycling, bounds the site to the north; Duck Creek, which flows west and empties into Walker Slough at the Union Pacific Railroad, bounds the site to the south. According to the County Assessor records, the site property (APN 177-02-29) comprises 8.69 acres. On June 28, 2007, Cove Contractors received a document titled Notice of Adoption of Waste Discharge Requirements for Cove Contractors Landfill, Cove Contractors, Inc. and EI Dorado Property Management, San Joaquin County (WDR) from the Central Valley Regional Water Quality Control Board (RWQCB) (Order No. R5-2007-0084). The WDR required Cove Contractors to submit quarterly and semi-annual groundwater monitoring reports in order to meet the evaluation, detection, and corrective action monitoring specifications for the groundwater monitoring wells located on the Site. In addition, the WDR also required the submittal of a technical report evaluating five quarters of groundwater monitoring data on the organic and inorganic concentrations of the background-monitoring well (MW-5). This evaluation would determine if MW-5 shall continue to function as the background or upgradient well. Section 3.0 discusses why MW-5 should not be utilized as a background well; therefore, recommending that removal of on-site wells and subsequent installation of additional off-site wells is required in order to establish a true background/upgradient well network. The installation of additional off-site monitoring wells is proposed in this workplan (Section 4.0) to further evaluate the upgradient groundwater conditions at the Site. This workplan will provide the scope of work necessary to destroy some of the on-site monitoring wells from the current groundwater monitoring well network, and to install new upgradient groundwater monitoring wells. Miller Brooks submitted a Sample Collection and Analysis Plan (Miller Brooks, 2007) to the Central Valley RWQCB outlining the monitoring activities and data evaluation of current on-site monitoring wells, in accordance with the WDR. Sampling and evaluation of these newly installed off-site wells will be incorporated into the quarterly and semi-annual monitoring events, as described in the Sample Collection and Analysis Plan, and will be evaluated in comparison to the current on-site monitoring well network. The following sections provide a brief background discussion, a technical evaluation of MW-5, description of the groundwater investigation, health and safety procedures, data evaluation, reporting, and schedule of future activities. AWiLcEN aAr OKAF P:\707 Cove Contractors\WDR\Tech Report and WP 2008\Tech Report and WP-FINAL.doc