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Hubber;on Gulch .411uvium <br />~~ <br />The alluvium in Hubber;on Gulch occurs in the lower reaches of the gulch in <br />and adjacent to the permit ar?a. Dectn tJ wat?r data indicates that the <br />aquif?r may vary from semi-confinetl to water table conditions. The amount of <br />head, if any, is y^enerally less than S `» t. +vat?r quality analyses of two <br />alluvial wells indicate that tnes? calcium-bicarbonate type 'Maters do net meet <br />U.S EPA drinking standard;. '~anganese. suifat?, TDS, antl chromium are found <br />to be in expess of standards. h?s? 'rater; d0 meet StoC< wdt?ring Crit?rid, <br />and may be used for irrigation dependent 'JOCn crcc anp 5011. cnaracteri5tics. <br />Springs and Saes <br />An initial spring survey in .;ui%, 19i9, lccated 14 springs and seeps in and <br />Heir the permit ar?a. The ma;c ri tv of these springs and seeps occur in valle% <br />bottcros. The recharge to these valley bottom springs may be from a <br />discontinuous alluvial aquifer, from colluvial slumps, or from perched <br />aquifers draining to stream sediments. Se•/eral springs issue from the <br />Williams Fork Fcrmaticn, while two other; issue from the overlying Twenty Mile <br />Sandstcne. Some cf the springs are used to fill stock ponds in the ar?a, <br />while the majority either con.tribut? flew to the Creeks or provide recharge tc <br />down gradient alluvium. <br />Olsen Spring, whi,:;n has an adjud'•C3`ea dcmestic wat?r right associit?, with <br />it, issues from the Dry Creek Ai'uvium about 20 feet from Dry Cr??k. ibis <br />spring is located abcut 9,000 feet dcwnstream rrom mining. <br />Both Huboersen Gulch and Dry Creek ma% pct?ntially be impacted by ,Wining, <br />specifically by spoils discharge recnar~ing the streams. Oeoer~dent upon the <br />time of year, Dry Cre?k may be recharging its alluvium, or the alluvium may be <br />adding water t0 the Cr??K. F~,,rther-C r?, dependent UGOn 1OC31 COndit10n5, <br />discharges from the pr?dicte: seeils aquif?r ma% infiltrate the Hubb?r;cn <br />Gulch alluvium. This water may f~ow through the alluvium downgradien*_ to <br />recharge the Dry Creek alluvium from whim Olsen Spring issues. <br />It 15 proiected by the applicant that, due to dilution, there will be no <br />impact to Olson Spring quality which may be attributed to mining. An alluvial <br />cross-section of wells in Hubberson Gulch upgradient of the Spring will help <br />monitor the 3dV3nCe of any plume in that gulch. A water quality monitoring <br />plan was initiated at Olson Spring to provide baseline data of this sprinq. <br />If the quality Or dUartity of tr.? spr-in3 is adv?r;e!y imeactatl by mining, <br />Peabody '~Odi Gcmpany m3% pe r?d;`.'?d ty pf~vide in dCC?ptab;? i~t2rndtly? <br />wit?r supply. For `Urtn2r dI;CU;;iGn ~df till 5, ;?'_ SettlOn V:: - adtnr R`gh*; <br />and Replacement. <br />Ten springs which 3r? pr?52nt In 'Jr 3tl]3CenC t0 the perm t dr?a `.~?r2 CnC52n <br />for further stud`/. At ?acn cf these sit?;, three `,vat?r cuaiity and discharge <br />measurement; were ma.e durir,o the summa- and fall of 193. T%p~call%, quality <br />and quantity variad from spring to spring. <br />_ 17 <br />