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Geosyntec'= <br /> consultants <br /> Local variations in the groundwater flow direction may occur within the interior of RRI <br /> in proximity to the drainage channels. Groundwater generally discharges into the unlined <br /> drainage channels but following precipitation events recharge to groundwater may occur <br /> along some portions of the unlined drainage channels (Tetra Tech, 2002; PRC, 1997b). <br /> The geochemistry of the surface water in the drainage channels and groundwater is <br /> similar during the dry season providing a line of evidence that groundwater is discharging <br /> into the surface water drainage channels (Figure 9). Additionally, VOCs have been <br /> detected in water samples collected from the drainage channel at Site 3 where the VOC <br /> groundwater plume intersects the drainage channel (ERS, 2012). <br /> During the summer months, evapotranspiration from abundant plants(trees, grasses, and <br /> brush) in some areas may extract groundwater and cause localized depressions of the <br /> potentiometric surface(Tetra Tech, 2002). <br /> RRI Groundwater Monitoring Work Plan 14 1 June 2018 <br />