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<br />through 1978. This could be due to the higher rates of ground-water flow in this <br />area from the increased gradient. <br />Well GBB2 is used to monitor the Second White Sandstone aquifer at the GBB <br />site. This well has been influenced by cement contamination. TDS values for well <br />GBB2 have been affected by the cement. The plot of well GBB2 (see Figure 4.8-46) <br />should not be used to indicate any changes in the aquifer at this site. <br />A pH of slightly less than 7 to approximately 9 has been observed for well <br />GE3. The pH of well GBB2 has been elevated above the expected value. The pH of <br />water from well GBB2 was in the expected range during the September of 1986 sampling <br />(see Table 4.8-10a). At least one casing volume needs to be removed from well GBB2 <br />to obtain a field pH that is representative of this aquifer. <br />A variation of SAR values from 3.6 to 40 from well GE3 have been observed. <br />Well GBB2 has SAR values of approximately six. <br />ALLUVIAL AQUIFER <br />The alluvial aquifer TDS at well GBB3 has been fairly steady with time (see <br />Figure 4.8-47). Only a few TDS data values are available for alluvial 4ell J1. <br />Figure 4.8-48 indicates an increasing trend in TDS for the Johnson Gulch well. <br />Additional monitoring is needed to establish any long-term trends for :this aquifer. <br />The pH of water from well GBB3 has been in the expected range. The variations <br />in pH of water from well GBB3 seem natural. The pH values from alluvial well J1 <br />have been slightly above 7 and seem to be stable. <br />4-233 cc E,,'iri D rim