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<br />. <br /> <br />002285 <br /> <br />subjects that include sedimentation, circulation patterns, trace element chemistry, remote sensing, <br /> <br />and public health issues (potter and Drake, 1989). <br /> <br />C. Details of Current Monitoring Program <br />. The current moriitoring program was initiated in 1990 in response to the need to understand- <br />how physical and chemical processes in Lake Powell and the operation of Glen Canyon Dam <br />influence the quality of water released to Colorado River in Grand Canyon. Based on limited <br /> <br />personnel and financial resources, efforts were made to incorporate existing technology to <br /> <br />improve the overall quality and resolution of measurements taken, eliminate unnecessary <br /> <br />activities, and automate routine data collection tasks. This program balances a broad based, high <br /> <br />quality, data collection program with limited resources. <br /> <br />1. Quarterly Lake Wide Sampling <br /> <br />Based on characteristic seasonal patterns and conditions, lake-wide sampling is conducted on <br /> <br /> <br />Lake Powell on a quarterly basis. Efforts are made to describe the physical and chemical <br /> <br /> <br />conditions of the major strata of the reservoir in the main Colorado River channel and the major <br /> <br /> <br />tributary arms of the San Juan and Escalante Rivers. <br /> <br /> <br />Sampling takes place over a week-long period and consists of measurements and chemical <br /> <br /> <br />samples collected at 20-25 established stations along the main channel and major tributary arms. <br /> <br /> <br />After initial surface observations are made, a profile of the physical parameters of temperature, <br /> <br /> <br />specific conductance, dissolved oxygen, pH, redox potential, and turbidity throughout the water <br /> <br /> <br />column is collected. This provides details of the density stratification patterns separating the <br /> <br /> <br />significant layers of the reservoir, location of inflow currents, dissolved oxygen patterns and <br /> <br />overall chemical conditions in the reservoir. Results are recorded on portable data logging <br /> <br />equipment for immediate viewing in the field and automated transfer to data management <br /> <br />systems. <br /> <br />03/06/98 <br /> <br />DRAFT <br /> <br />Page 9 of 62 <br />