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thought to be in error because the DSSUM value indicates that the TDS is too low. <br />The 1986 value shows essentially no change from past values. The U aquifer is also <br />monitored in well GZ2, which is approximately one mile upgradient of U well GF2. A <br />steady concentration in well GZ2 has been observed. (see Figure 4.8-33). The <br />December, 1982 measurement for TDS is thought to be too low because the DSSUM value <br />indicates the TDS should be close to the other values. TDS was significantly higher <br />at this upgradient well than it is at well GF2. <br />The U aquifer well (GF2) at this site contains water with a pH of <br />approximately 8.5, while the pH of water from U aquifer well GZ2 has generally been <br />between 6.5 and 7. <br />SAR values above 30 are seen at well GF2. The SAR values for GF2 could create <br />a problem for irrigation of tight soils. The SAR values from well GZ2 have been low <br />(less than 1). <br />QR AQUIFER <br />Figure 4.8-34 presents the TDS plot for well GA1. Concentrations of TDS in <br />water from the QR aquifer in this area have been fairly steady since 1974, at a <br />concentration of approximately 800 mg/l. Two of the TDS measurements are outliers <br />and are likely erroneous. <br />Well GE1 is used to monitor the QR aquifer (see Figure 4.8-35). TDS <br />concentrations for the QR aquifer in this area have been fairly steady with time <br />with no significant trends. Well GD2 is completed in the QR aquifer below the <br />4-233 x REVISED FFR 13'87 <br />