1987-12-01_PERMIT FILE - C1981017 (177)

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• GEOLOGY Deeor^:ption of y^^roC..jio units and :hair hydro2cgio proper:iae" Ma a i m.ae System Series Geologic unit Symbol thickness Physical characteristics Hydrologic characteristics (feat) Clay, slit, sand, gravel, and boulders. 1laported- ,+ell yields are as much as 25 Colluvium Qc SO Ganeraliy poorly sorted and angular. gal/min. Source of rater for many Formed as s result of debris accumu- springs. Water quality dependent on latlon at foot of slopes. composition of.parent material. Clay, slit, sand, and gravel. Deposits Reported well yields are as much as 75 are moderately to poorly sorted and gal/m;n. important source of water In consist of either angular or rounded Carbondale arm&, Water quality variable fragments. and dependent on underlying bedrock and Holocene source of alluvial material. water Is a calcium sulfate type or a calcium bicar- Donate type. Dissolved-solids coacan- AlluvIva Qal 200 tratlon ranges from 245 to 1.460 mg/1. Selenl�a occurs in a,cast of u.5. Publlc health Service (1962) drinking-water standards where alluvium is in contact with the Eagle Valley Evaporits. Hydrau- < lic conductivity values range from 1.0 ft/d In the Cattle Creak valley to 100 ft/d In the Roaring Fork River valley. Olivine basalt, dark-gray, moderately to Reported welt yields generally range from highly vesicular and often dense. Com- 25 to 50 gal/oln; yields of 100 gel/min army jointed and fractured and weath- are not uncommon in collopsod areas. ers to o reddish-brown color. Basalt Is primary source of avatar In Cot- tle Creek drainage basin; no Information Pleistocene Basalt QD 1,000 available for basalt In western part of Crystal River drainage basin, water is • calcium bicsrbonsta typs. Dissolved- sollds concentration ranges from.ill to 475 ng/l. Hydraulic conductivity values • range from 1.0 to 40 ft/d. Pliocene Pradcminantly granodlorite and quartz No information availabls. kot an aquifer Miocene igneous rocks Ti �Indater- monzonite, light-gray, to brown, medium- In study area. .'e Oil Iocan'se minotd grained, dense, and hard. Fracturing 1 and Jointing ccvnnon. Claystone, nuds.tone, and shale with in- No information available. Hot an aquifer '- Wasatch tarbeds of siltstone and conglomerate. In study area. Eocene Formation Tw 6,00o Coarser grained beds tend to be arkosic and lenticular. Interbedded sandstone, shaly sand, shale, Data for only one well obtained; water Is and coal. Sandstones are tan in color, a calcium bicarbonate type. Dlasoived- Mesaverda mmv 2.700 massive, and form prominent ridges. solids concentration Is 161 mg/l. Formation Shales are greenish gray and locally ear Donaceous. Coals are economically Upper important. ' Cretaceous Dark gray shale. with Interbedded sand- Data for only one wall obtained; water Is y Mancos Km 4.000 stone, siltstone, and Ilmestdne. a Calcium bicarbonate type. Olssolved- Shale None, &.-a calcareous and slightly solids concentration Is 237 mg/1- carbonaceous. Locally fossiliferous. ., Predominantly light-gray. very fine to No ;nfor:ation avallobla. may be an squl- Dakota Sandstone medium, well-sorted, well-cemented, far In outcrop area. Lo—ar and sandstone with shale and siltstone Cretaceous Burro Canyon 300 )nteronds.. Chart-pebble conglomerates Formation ( are common. The sandstone weathers to .. a rust-brown color and forms ridges. Varicolored shale with interbedded light-1 No Information availablo. May be an aqui- groy sandstone and siltstone and dark- I far In outcrop area. Morrison gray Ilmustone. Sandstone beds are N formation 325 more prominent in the lower part of the formation; limestone bads, In the < upper middle. Jurassic KPu Sandstone, yellowish-grey to gray, very No Information available. May be an equl- Enerada ISO fine to medium, well-sorted, cross- i far in outcrop area. Sandstone bedded, and calcareous. Weathers to an orsnga-gray color; forms rldgas.