Laserfiche WebLink
a~ LOCAL GROUND WATER HYDROLOGY <br />v+ <br />A discussion of the local ground water hydrology is pertinant <br />to this report since the permit area is located within a sequence <br />of sedimentary formations. All of these are saturated and supply <br />small to moderate amounts of water locally. The reader is refered <br />to the Geology section for a detailed description of these forma- <br />tions. <br />TheRetonCreckNo.2MinePrOjeCt is situated in an area where the water <br />bearing Raton Formation, Vermejo Formation and Trinidad sandstone <br />have all been exposed by erosion and fluvial development. The <br />underlying impervious Pierre shale is also exposed to the north. <br />Figure 1 is a map showing the surface exposures of these aquifers <br />in relation to the proposed project and surface drainages. In- <br />termittant streams generally flow in these steep canyons. Out- <br />croppings of coal in the Vermejo Formation are also indicated, <br />together with locations of past coal mining sites. <br />Followiny is a brief description of each aquifer which occurs <br />in the Starkville area. <br />Trinidad Sandstone <br />The Trinidad sandstone is the basal aquifer unit within the <br />permit area,averaging 100 feet in thickness. This tabular sand- <br />stone is fine to medium grained and slightly arkosic with occasional <br />thin beds of silty shale. Cementing material is calcium-carbonate <br />and silica', the degree of which varies from place to place. <br />The formation exists in a water table condition where it <br />outcrops. Recharge is through flow from the west and local <br />Hf° <br />FISHER, HARDEN 6 FISHER <br />Revised 5/93 <br />120 <br />