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• Given the lenticular nature of the Vermejo Formation, there is a potential <br />for occurrence of small perched groundwater reservoirs where favorable <br />lithologic and recharge characteristics exist. Any such reservoirs which <br />exist are expected to be limited in size and areal extent. Given the <br />uncertainties relative to the capacity and location of perched groundwater <br />reservoirs, beneficial use is unlikely and has not been attempted to date. <br />The Raton and Poison Canyon Formations which are located a minimum of 350 <br />to 400 feet above Southfield mine workings, display similar lithologic <br />and stratigraphic characteristics to those previously subscribed for the <br />Vermejo Formation. Relatively low permeability siltstone and shales along <br />with extensive cross-bedding and inter-bedding effectively limit potential <br />storage and movement of any significant quantities of groundwater. <br />The Corley Company Well, completed in the Raton Formation, has a yield of <br />approximately one (1) gallon per minute. There are no other known users <br />• of groundwater from either the Poison Canyon or Raton Formations within <br />the groundwater basin. ___ _ _ _ <br />Colluvial/alluvial materials occur as surficial deposits over much of the <br />general area. These materials are the result of mass wasting and erosion <br />of the Wet Mountain uplift to the south and west and vary significantly <br />in consist and size. These colluvial/alluvial materials are either <br />unconsolidated or poorly to moderately cemented and have the potential to <br />store and transmit significant quantities of groundwater. However, these <br />surficial deposits are intersected by the numerous ephemeral drainage in <br />this area and as a result areal extent and continuity are limited and any <br />groundwater resources contained in the colluvial/alluvial materials <br />discharge to the surface water system at the exposed downgradient margins. <br />Within the groundwater basin, the only areas where colluvial/alluvial <br />deposits play a significant role in the hydrologic system is in the <br />floodplain and immediately adjacent terrace areas of the Arkansas River <br />and tributary perennial drainages. <br />The Trinidad Sandstone, a fine to medium grained cross-stratified <br />sandstone approximately 90 feet thick, is considered the basal unit <br />relative to groundwater hydrology within the groundwater basin. The <br />2.04.7-4 <br />