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<br />I, '\ 1 <br />)u , J J <br /> <br />HIGH TDS WATER FROM NAVAJO AQUIFER <br />JIAS ISOTOPIC SIGNATURE OF WATER FROM <br />THE UPPER PALEOZOIC AQUIFER <br /> <br />Water samples from sites In the Navajo aquifer with a oK1Sr signature sirrular to waler from the <br />Upper Paleozoic aquifer generally have the highest dissolved-solids concentration relative (0 <br />other Navajo aquifer sample sites (figure below). Si;( of the ten sites with a diswlved-solids <br />concentration greater than 6.500 mg/L plol within the range of oK1Sr values expected in water <br />from the Upper Paleozoic aquifer and a seventh and eighth sile plot close to the expected <br />range. The oVSr signature of these eight Navajo aquifer wells would indicate mixing wilh a <br />significant volume of water from the Upper Paleozoic aquifer (mean = 11,900 mgIL. number = <br />4). The remaining (wo sites (N25 and N40) that have a significantly lighter oll7Sr than wafer <br />from the Upper Paleozoic aquifer. may indicate mix.ing with an unknown source(s) of salinity. <br /> <br />Am'th Progress Reporl--February /995 <br />