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<br />--- <br />cun I',~ <br /> <br />\.Iater Qual i ty <br /> <br /> <br />Samples for water-quality analysis were collected from Grange Hall Creek pe- <br />riodically at time' of dry-weather ~ and during ,elected period' of rainfall or <br />snowmelt runoff. Although most samples were collected at ,Ites 2 and 5 (fig. 2; <br />table 1). occasional ,ample, were also collected at sites 1, J, and 4. Results of <br />water-quality analyses are given in tables 24 through JJ (Hydrologic Data section. <br />at back of report). Analysis consisted of some but not neces,ari ly all of the <br />following; Specific conductance. pH. water temperature. fecal-col iform bacteria. <br />,eiected major anions and cations. su,pended sediment. selected nutrient'. oil and <br />grease. ,elected trace element'. and selected pe'ticldes and EOlychiorinated <br />biphenyls (PCB's). Specific conductance. pH, and water temperature were measured <br />at the time of sample collection. Fecal-coliform bacteria were determined at the <br />sampling site or at a U.S. Geological Survey fleid ,ervices laboratOry within a <br />few hours of collection. Sediment concentrations also were determined at this <br />iaboratory. All other determination, were made at the Denver Central Water Qual- <br />ity Laboratory of the U.S. Geological Survey. Methods for sample collection and <br />analysis are given In Goerlitz and Brown (1972), Greeson and others (1977). and <br />Skougstad and others (1979). <br /> <br />Data for dry-weather flow are given in tables 24,27.30, and 33: data for <br />rainfall runoff are given In tables 25.28. Jl. and JJ; data for ,nowmelt runoff <br />are given in tables 26. 29. and 32. Miscellaneous specific-conductanCe data are <br />given in table 34 (Hydrologic Data section. at back of report). <br /> <br />Water-quality standards for agricultural use In Colorado are sho'vJn in <br />table 2. Constituents were only included in table 2 If standard' have been e,tab- <br />lished and if concentrations of these constituents were determined. <br /> <br />7 <br />