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Figure 4, th maximum groundwater graaient occurs in the <br /> southern portion of the site and is approximately 0.002, or <br /> 10. 5 ft/mile. The minimum groundwater gradient occurs in <br /> the northern portion of the site and is approximately <br /> 0. 0003, or 1 . 6 ft/mile. The figure depicts a southerly <br /> gradient although well MW2 appears to have a water level <br /> somewhat higher than expected in a uniform regional flow. <br /> This may be due to a non-homogeneous flow field, to minor <br /> recharge effects, or to inaccuracies in survey of level <br /> measurements. The effect is not enough to alter flow direc- <br /> tion significantly across the site. There are no indica- <br /> tions that any significant zone of perched groundwater <br /> exists beneath the site. Any perched water which may be <br /> present is likely very localized and/or intermittent and, <br /> therefore, cannot be considered a significant source of <br /> usable groundwater. <br /> Laboratory analyses of the groundwater is summarized in <br /> Table 1. The geochemical conditions beneath the site cannot <br /> be determined based on one set of analyses. However, none <br /> of the sample results exceeded Title 22 Maximum Contaminant <br /> Levels ( MCLS ) for Drinking Water. The total dissolved <br /> solids (TDS) concentration in MW5 is equal to the short term <br /> MCL of 1500 ppm. This is somewhat inconsistent with the <br /> electrical conductivity (EC) of 789 umhos/cm and the EC/TDS <br /> ratio of the other samples which were between the normal <br /> range of 1 . 5 and 1 . 7 . The EC/TDS ratio for MW3 ( 0. 74) was <br /> also atypical. Due to an oversight at the laboratory, only <br /> nitrate (NO3 ) and total kjeldahl nitrogen ( TKN) instead of <br /> total nitrogen (NO2+ NO3+ TKN) were determined. This over- <br /> sight had very insignificant consequences since very little <br /> or no reportable NO2 would be expected to be observed. Even <br /> so, future samples will be analyzed for total nitrogen. TVG <br /> personnel will continue to monitor the five wells, as re- <br /> quired by Monitoring and Reporting Program No. 88-147, to <br /> evaluate the impact of land disposal of process water on <br /> groundwater quality. <br /> 5 <br />