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. J ,W ~Y` <br />, ~~ ~ y <br />' ~~~~ <br />VJ ~ ~ Exhibit G <br />• ~ ~ w w~~ <br />these parantetes have heel analyred during the quarterly monitoring oonduc6ed for the Dowe Flats <br />mine permit appligtion. The paranretes, mrrcerttrations and MCIs are listed in Table G~. <br />Qtrarterly monitoring results indicate that the surface water at Dowe Flats meets all requirertarts for <br />drinking water except for turbidity. The turbidity MCL was exceeded at each surface water station, <br />except for station DFSW-1 during 3rd quarter, 1990, when the station was dry. A turbidity level of <br />5 turbidity units (I'U) is acceptable urtder oonditi these conditions could be met the <br />turbidity level is exceeded only twice; once ' uari~, 1990, at DFSW-2 and in the second <br />quarter, 1990, at station DFSW-3. ~~y~ ~1 <br />Klt~l.G~n ah~? <br />Parartreters not tested dtung quarterly monitoring incl ' 'ty, microbiologi~ 2 <br />a few specific organic compounds sttch; as para~ichloroben7erre and total trihalometlianes. <br />Historical Data Compared to Drinldn~Water Standards <br />The historical water quality data fmm St. Vrain Creek (Table Gam) does not readily compare to the <br />• drinking wafer standards. Many of the required analyses were not performed, and the analytical <br />methods that were employed were generally not oonsisGerrt with CDH monitoring requirements. <br />3.0 GROUND WATFli <br />Hyd~eoloev <br />The project site is situated along the axis of the doubly-plunging Dowe Flats syncline in a valley <br />mantled by urtoonsolidated valley fill deposits of Quaternary age. ]3etteath the valley fill deposits are <br />folded beds of the Pierre and Nobrara formations of Cretaoeotrs age. Older strata are exposed east <br />and west of the project site. <br />The axis of the Dowe flats syncline trends approximately north-south through Dowe Flats. It plunges <br />to the north along a line between sections 9 and 10, T3N, R70W and w the south in section 15, T3N, <br />R70W. The syncline is asymmetrical with 10 to 20 degree dips along the west limb and vertical to <br />ovetumed beds on the east. Interpretations of low altitude aerial photography suggest that there may <br />be extremely tight folds superimposed on the eastern limb of the syncline. In addition, exploruion <br />drilling data indicates that the Niobrara Formation is tightly folded at depth along the eastern limb of <br />• <br />