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2.04.7 Hydrology Description <br />ROLLINS SANDSTONE WATER QUALITY <br />Alkalinity <br />Chloride <br />Sodium <br />TDS <br />BRL #2 DH -34B <br />3430 <br />625 <br />1940 <br />4660 <br />BRL #2 NM4X98 -29 <br />3420 <br />540 <br />1560 <br />3670 <br />BRL #2TC -03 -01 R <br />1996 <br />460 <br />1030 <br />3250 <br />Oxbow - SC -1 <br />2580 <br />3140 <br />3120 <br />7400 <br />Oxbow - SC -2 <br />3540 <br />3150 <br />3450 <br />8500 <br />MCC SOMA 28 -H <br />3940 <br />2610 <br />3060 <br />8230 <br />Reference: SOM 1992 AHR, MCC 1994 AHR <br />In general, groundwater within the Mesaverde Formation is of sodium <br />bicarbonate type, and the total dissolved solids ranges from 900 to 8,960 <br />ppm. High mineralization and high sulfate and sodium content of this <br />groundwater precludes the use for potable, stock and irrigation purposes. <br />Electrical conductance and total dissolved solids values from Mesaverde <br />sources are typically a factor of ten higher than similar parameters measured <br />from colluvial, near surface water sources (2,000 to 8,000 umhos v.s. 200- <br />800 umhos, respectively). The notable difference in water quality clearly <br />separates the groundwater systems and suggests the longer residence time <br />(and lower transmissivity) of the waterwithin the bedrock Mesaverde (referto <br />Groundwater Monitoring results). <br />Upper Perched Water Zone and Rollins Sandstone <br />The interpretation of the groundwater presence in the Mesaverde Formation <br />is based on the observation of water presence during the exploration drilling, <br />water level measurement during the geophysical well logging, and water level <br />measurements in the monitoring wells. The results of this interpretation are <br />shown on Maps 10, 10A and 10B. These maps show the perched water <br />bearing areas within the water bearing zones, the B -Seam and also areas <br />where the data points show these zones to be dry. As shown on Map 10, <br />East of Terror Creek, the upper perched water bearing zone is <br />discontinuous. It is not possible to predict a peizometric surface over an <br />extensive area for the upper perched water bearing zone because of the <br />variability of the water levels in the monitoring wells and the areas where <br />data indicates the upper perched water bearing zone is dry. Map 10A <br />presents the regional projection of the potentiometric surface above the 13- <br />Seam. West of Terror Creek, the potentiometric surface above the B -Seam <br />PR -14 2.04-42- 03/14 <br />