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~~ <<~ <br />• <br />U <br />• <br />1.0 IlV'ITZODUCTION <br />EXIIIBTf G -WATER INFORMATION <br />~~ ~ <br />~,`~~,` , <br />~ ~S' <br />The Dowe Flats Project is located in a gently sloping valley between Rabbit Mountain to the east and <br />Indian Mountain to the west (Figure G-1). The valley slopes at an approximate grade of two peroent <br />or less to the south and is drained by inlertnittent streams of the St. Vrain Cteek system. The <br />unnamed Dowe Flats stream system flows southward through the property and intersecxs the Supply <br />Ditch, an irrigation ditch located north of St. Vrain Crerk akmg the southern edge of the property. <br />The principle drainage in the vicinity of the project area is eastward flowing St. Vrain Creek. It <br />originates in the mountains west of the town of Lyons and occurs approximately one mile to the south <br />of the Cotenancy property. <br />4, Township (T) 3 North (N), Ran (R) 90 VTe~ <br />?D WQS'f" ~ <br />v <br />A hydrologic monitoring network has beer[ established to monitor the surface water and ground wale <br />at the Dowe Flats property. Monitoring locations (Figure G-2) were placed in upgradient aM <br />downgradient positions to establis b~sehne water quality. <br />The project area is used primarily for agriculture and livestock grazing. Boulder ty-Aper~ <br />land is situated to the noNteast and east. Some private resdences and yntex Chemicals (S tex <br />waste facility is located to the north. The west ode of Dowe Flats is comprised of undeveloped <br />grazing land and a dairy farm. Other livestock properties are situated in the southern portion of the ~~ <br />project area. ~ w„$. ~ <br />""1 <br />The primary source of ground water in the project area is an unconsolidated shallow alluvial aquifer <br />of Quaternary age that ranges between 12 and 30 feet thick. Cretaceous-age sedimentary formations, or <br />the Niobrara Formation and Piece Shale, underlie the unconsolidated alluvium. Both formations are ~nrtc;tci- <br />clasvfied as aquifers with inadequate well yields of less than one gallon per minute (CGS, 1980). <br />Domestic and stock wells are located on some of the properties especially north and south of the ~ ~ ~ <br />project area. In addition, there are appro ' 7 monitoring wells permitted by Syntex in Section ~" <br />2.0 SURFACE WATER <br />Site Description <br />The Dowe Flats Project area is located in a broad, gently-sloping drainage basin that is flanked on the <br />rxnth, east and west by more steeply-sloping terrain. The drainage system flows from ridges to the <br />