Laserfiche WebLink
<br />032386 <br /> <br />financial resources, efforts were made to incorporate existing technology to improve the overall <br /> <br />quality and resolution of measurements taken, eliminate unnecessary activities, and automate <br /> <br />routine data collection tasks. This program balances a broad based, high quality, data collection <br /> <br />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 />Lake Powell on a quarterly basis. Efforts are made to describe the physical and chemical conditions <br /> <br />of the major strata of the reservoir in the main Colorado River channel and the major tributary arms <br /> <br />of the San Juan and Escalante Rivers. <br /> <br />Sampling takes place over a week-long period and consists of measurements and chemical <br /> <br />samples collected at 20-25 established stations along the main channel and major tributary arms. <br /> <br />After initial surface observations are made, a profile ofthe physical parameters of temperature, <br /> <br />specific conductance, dissolved oxygen, pH, redox potential, and turbidity throughout the water <br /> <br />column is collected. This provides details of the density stratification patterns separating the <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 systems. <br /> <br />Based on the stratification patterns seen from the physical profile, depths for discrete chemical <br /> <br />sampling are determined, with the objective of characterizing the major ion and nutrient content of <br /> <br />the significant layers of the reservoir. Sample processing is performed on shipboard for later <br /> <br />analysis at a remote laboratory. Alkalinity titrations of these samples are also performed on <br /> <br />shipboard. <br /> <br />Biological sampling consists of chlorophyll sampling of surface samples, collection of discrete <br /> <br />06102/98 <br /> <br />DRAFT <br /> <br />, oe 9 of 62 <br />