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1.4 GROUND WATER HYDROLOGY <br /> • During drilling activities, ERM typically encountered ground water in <br />' borings at depths between 30 and 40 feet bgs The ground water <br /> potentiometric surface at the property ranges from approximately <br /> 31 to 35 feet bgs <br />' ERM evaluated ground water flow at the former UST location using the <br /> three on-site monitoring wells Table 1 presents the ground water <br /> elevations recorded during quarterly sampling events Ground water flow <br /> direction in the aquifer beneath the site fluctuates, although the majority of <br /> monitoring events indicate a northwestern trend of flow The most recent <br /> ground water elevation contour map, along with a rose diagram displaying <br /> historical ground water flow direction, is shown on Figure 5 Ground <br /> water wells are a common source of potable water in the Great Valley <br /> geomorphic province, however, no water supply wells exist within a <br /> 2,000-foot radius of the site A copy of the Environmental Data Resources <br />' (EDR) Radius Map has been included as Figure 6 This information <br /> satisfies Item #1 of the PHS/EHD checklist <br /> 1 <br /> r <br /> r <br /> ERM 3 9343 50/UPRR/11/06/02 <br />