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• Wells and springs in the Vermejo and Raton Formations generally yield less than 10 gallons per minute from individual water-bearing layers, but coal seams yields may be as much as 35 gallons per minute. Pumpage usually results in large drawdowns. Specific capacities in 17 wells range from 0.006 to 0.43 gallons per minute per foot of drawdown with a mean of 0.11 gallons per minute per foot. Low specific capacities exist because sandstones in the coal- • bearing formations are tightly cemented and water-bearing coal seams have only secondary permeability. Mean laboratory permeabilities for core plugs taken from well USGS 78-1 (T33R67SO4) are 4X10-5 ft/day, horizontal, and 1X10-4 ft/day, vertical (Howard, in prep., p. 33). Results of aquifer tests of Raton and Vermejo strata are listed in Table 1. Tab 1e 7.4-1--Aquifer Tests in Raton Basin Sp.elfle Capfelty tlydrfullt COnductlvicY rrfn~if~lrity 1 19~llOn~ per slnuu per L9ot1 1l u t per d~Yl flat t9u~r• per d~yl ~ Aqu Stet NuIDb~L OL NuNWt Ot NumWr at Tut• Afnu N~~n TUtf A.n9• N~~n Tf ~t• f~n9• Nun Alluvlua 7 f.f-7f 15.7 10 0.01 f-lff0 lff f O.lf-570 f3.f Pot wn CanYOn 7 0.007-0. 0![ 0.0]3 MO T1JTL NO TLSTf V~rm~7o-Rttm 17 O.OOf-0.17 0.11 ]f 0-f S.f 1.57 )f f-f 0.7 10.5 Coil end cat non~e~0u• NOT L/yL IlIC 1] 0-S. ff l.ff 13 0-]t .0 f.lf ~ .n.l• LfnO ttOn~ NOR SfLCIyIC 1] 0-S.f7 0.57 1] 0-1l.7 f.f0 S S lucon~ •M cn~l• NOT e)LCSlIC f 0-fi.f 7.75 f 0-l0.7 lf.f Trin Sdfd 1 O.Of3 1 0.075 1 1.75 ' O~kac~ 1 1.0 NO TLSTS NO TLLT9 Ground water varies from bicarbonate to sulfate in composition. Most of the ground water is sodium bicarbonate with 500-1500 mg/L dissolved solids. At higher elevations, some of the ground water is calcium bicarbonate with less than 500 mg/L of dissolved solids. In stream valleys some oP the ground water is sodium sulfate with 500- 1500 mg/L of dissolved solids. 65