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• the lower Burro Canyon and Upper Brushy Basin contact zone. Additional information regarding <br />Willow Spring is provided in Section 8.3. <br />The two Cherokee Wells appear to have limited productivity. The shallow well is approximately two- <br />feet in diameter and was probably installed using a churn drill. This well contained only two to three <br />feet of water when sampled in 1999 and required one-half hour to recover from hand bailing. The <br />deeper well, when sampled in 2000, did not fully recover from hand bailing after 70 minutes and the <br />sampler noted that the sound of dripping water could be heard inside the casing. Cotter's exploration <br />drilling in 1996 did not report any water in the upper Brushy Basin Member, although damp conditions <br />were reported over a five foot interval (110 to 115 feet) in Drill Hole JB-96-3. The limited occurrence <br />of water and low productivity of this zone is consistent with the fact that the sandstone lenses that <br />comprise this aquifer are thin and interbedded with mudstone <br />Middle Brushy Basin Sandstone <br />A second water-bearing sandstone lens was encountered in Boring BM00-1 at about 137 feet below the <br />• Burro Canyon/Brushy Basin contact. This sandstone zone occurred at a depth of 242 to 264 feet bgs. A <br />packer test was conducted over an interval from 250 feet to 280 feet bgs with 60 gallons of water being <br />pumped prior to taking a sample. The sample results, plotted on Figure G6, show that the meq ratio of <br />calcium to sodium plus potassium is about midway between the Burro Canyon Water and the Lower <br />Brushy Basin. Radionuclide levels were found to be at low to nondetect values. Analytical data for this <br />sample are presented in Table E-1. As discussed in Section 8.3, there are no known springs in the area <br />associated with this aquifer. <br />The Middle Brushy Basin Sandstone appears to have relatively high productivity compared to the other <br />water-bearing zones within the Brushy Basin Member. Cotter's exploration program in 1996 reported <br />from 10 to 30 gpm inflow on six of the seven wells at depths between 255 and 290 feet bgs. As <br />discussed in Section 7.2 below, this aquifer also appears to have been the major source of ground water <br />inflow into the Rajah 30 Mine shaft. <br />• <br />Whirlwind Mine 07 (rev. April 08) G-12 <br />