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<br />Wastewater treatment plant effluents were entering the River along the <br /> <br /> <br />entire length of the study area. Mechanical plants at Glenwood Springs, West <br /> <br /> <br />Glenwood Springs, New Castle, Grand Valley, and Grand Junction; aerated lagoon <br /> <br /> <br />systems at Rifle and De Begue; and Fruita with two lagoons in series were all <br /> <br /> <br />discharging during the study period. Other lagoons at Talbot Mobile Home <br /> <br /> <br />Trailer Park, Silt, Clifton #1, Clifton #2, and Palisade were not disCharging <br />during the sampling period. <br /> <br />SAMPLING LOCATIONS <br /> <br />TWenty-three sampling stations were established to determine causes and <br /> <br /> <br />locations of chemical and biological changes occurring as the River flows west <br /> <br /> <br />through the State (for exact -station locations see Table 1). Other locations <br /> <br /> <br />were sampled but were dropped from the program if changes in water quality were <br /> <br />not shown. <br /> <br />TWo stations, one below Dotsero and the second immediately upstream from <br /> <br />Grizzly Creek, provide baseline information on the River as the water enters <br /> <br />the study area. Other stations were established above and below sewage treatment <br /> <br />plant effluents and/or the confluence of tributaries with the Colorado. <br /> <br />METHODS llND MATERIALS <br /> <br />Chemical <br />Sampling and analysis techniques in general adhere to practices described <br />in "Standard Methods for Examination of Water and Wastewater", 13th edition, <br /> <br /> <br />1971. Water samples for chemical analysis were collected in two liter polyethylene <br /> <br /> <br />containers. The mobile lab was equipped during this study to perform the following <br /> <br /> <br />chemical and physical analyses; nitrate, nitrite, a1l1IOOnia, orthophosphate, <br /> <br />-8- <br />