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Geosyntec c consultants 3. EVS®MODELING OF COC DISTRIBUTION IN GROUNDWATER A 3D representation of the distribution of cis-1,2-DCE and VC in groundwater was generated in the EVS® software by C Tech. EVS® uses kriging methodology to interpolate between known data values. In this case, EVS® was used to interpolate groundwater elevations and cis-1,2-DCE and VC concentration data. The water quality monitoring data, gridding technique, results, and limitations of the method are discussed in the following sections. 3.1 Methodoloev 3.1.1 Data Used for Modeling The following areas of RRI were selected for cis-1,2-DCE and VC distribution maps: • Island-wide(Figure 11, 12); • Site 3 (Figure 13, 14); • Site 4 (Figure 15,16); • Central Area(Figure 17, 18); and • Landfill Area(Figure 19, 20). Island-wide plume maps for cis-1,2-DCE and VC were generated using the most recent water quality data from the 263 wells at RRI sampled between 2006 and 2016 by ERS (Table 3). Of the 263 sample results included in the models, 126 were from the RRI monitoring event conducted in the fourth quarter (September to December) 2015. Groundwater elevations from monitoring wells and the San Joaquin River collected during the September to December 2015 monitoring events were used to generate a groundwater potentiometric surface at which the plume models were cut.Only the portion of the plume within the saturated zone is displayed in models. 195 wells were gauged between September and December 2015 (Table 4). The surface water elevation of Stockton Deep Water Channel and San Joaquin River surrounding RRI were set in the models to 4 feet above msl based on the average fourth quarter 2015 surface water elevation at USGS stream gage#11304810 in the San Joaquin River at Garwood Bridge, Stockton (USGS, 2018). The stream gage surface water elevation range was 1.8 to 7.2 feet above msl during the period and fluctuated daily due to tidal influences. RRI Groundwater Monitoring Work Plan 15 1 June 2018