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<br />0180 <br /> <br />T1 <br /> <br /> <br />Lake <br />McKinney <br /> <br />Fountain <br />Creek <br /> <br />T2 <br /> <br />Arkansas River <br /> <br />....R4 .... A4 'YA5 "'AB <br />eG3 <br /> <br />eG5 <br />YA7 <br /> <br />yRl <br /> <br />yAl <br /> <br /> <br />YA2 <br /> <br />Pueblo <br />Reservoir <br /> <br />John Marlm <br />Reservoir <br /> <br />E)(PLANAT10N <br /> <br />... R1 SURFACE-WATER SAMPLING SITE--Number <br />refers to site number in table 4 <br /> <br />. G1 GROUND-WATER SAMPLING SITE--Number <br />refers to site number in table 4 <br /> <br />Figure 8.--Relative orientation of sampling sites and major streams, <br />reservoirs, -and canals in the study area. <br /> <br />Water samples from Pueblo and John Martin Reservoirs (sites RI and R4) <br />and from Lake Meredith (site R2) were collected at locations established for <br />previous monitoring projects. An inflow location was selected at Pueblo <br />Reservoir to represent conditions near the upstream end of the study area. <br />All other reservoirs were sampled at a central location. Bottom-sediment <br />samples were collected from shallow areas near inflow locations. Biota <br />samples were collected at various locations in and around the reservoirs, <br />depending on habitat distribution and species availability. Samples were <br />collected from three reservoirs in the Great Plains Reservoirs, which were <br />assumed representative of a single site (site R3). This site is located east <br />of John Martin Reservoir (site R4) but receives water diverted from the <br />Arkansas River upstream from site R4. <br /> <br />The sampled wells were completed in shallow alluvium that is hydrauli- <br />cally connected to the Arkansas River. The sites in Colorado were selected <br />because the wells supply water to large populations. The Kansas sites were <br />selected because the wells had the highest concentrations of selenium detected <br />during previous surveys. Several municipal wells were available for sampling <br />at each site; therefore, specific conductance was measured in water pumped <br />from each well at the site, and the well that had the largest specific- <br />conductance value was selected for sampling. <br /> <br />25 <br />