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999 <br /> <br />STATE OF COLORADO <br />~~On(:DIVIS~ON OF MINERALS AND GEOLOGY <br />DeparlmEnl of Natural Resources <br />1 31 ;Sherman SL, Rnom' I S <br />Denver, Colorado d0?03 <br />Phone. 13031 96d~35G7 <br />FA1: (303) 83?-9106 <br />(0'~wrE,r~can Soo(c` <br />DIVICION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFETY <br />sill o,.-ens <br />Governor <br />April 17, 1999 r/ c.~~g E. w.,l~her <br />E~ecul ire Direcor <br />Michael P. Long <br />To: Allen Sorenson ~~// Division Director <br />From: Harry H. Posey - ~ ~ r /~Jwr y Pb s ~ Y <br />Subject: Hydrogeochemical Review: American Soda, L.L.P.; Yankee Gulch Minerals <br />Project; Rio Blanco County; M-99-002 <br />This review focuses only on geological, hydrological, geochemical and hydrochemical aspects of <br />the permit. It is presumed that all of the following documents constitute part of the permit <br />application. (1) The MLRB Regular Operation (l 12) Reclamation Permit Application, Yankee <br />Gulch Sodium Mineral Project, January 1999; (2) Draft Soil Conservation, Erosion and Sediment <br />Control, Reclamation, and Revege[a[ion Plan October 1998; (3) Deleted under confidentiality <br />provisions of Rule 1.3(3). <br />GENERAL COMMENTS <br />1. Deleted under confidentia[ity provisions of Rule !.3(3). <br />DMO status. One feature of this operation indicates that it should be classified as a <br />Designated Mining Operation (DMO)• and another feature suggests that it may be <br />determined to be a DMO. <br />a. Segments 14 through 18 of the White River Basin include Piceance Creek and its <br />tributaries. These are classified for aquatic life, recreation and agriculture. Among the <br />regulated parameters for surface water that are exceeded in some of the groundwaters are <br />B, CI2, CI-, SOa, and Se. Alluvial groundwater, and at least part of [he upper aquifer, and <br />possibly parts of the lower aquifer as well, meet [he classification for drinking water. <br />Among the regulated parameters for drinking water, SOa, CI ,and F- and some metals in <br />the lower aquifer commonly exceed drinking water standazds. <br />• <br />The upper aquifer is generally an underground source of drinking water (USDW), <br />according to classifications under the Federal Safe Drinking Water Act, because it <br />generally contains less than 10,000 mg/L TDS. Information in [he permit application and <br />