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• at this site to date. Flow in this tributary reach exhibits intermittent eharacteristics <br />during the spring and early sunnier seasons. The early end mid-spring flows are <br />predominantly from melting of the snowpeck. The late spring end early summer flows were e <br />combination of flow from bank storage, artesian flow from improperly sealed USGS wells <br />(these wells have been sealed in 7994), and seepage from a developed spring supplied by <br />pe rehed ground water accumulated during the snowmelt period. The remainder of each year, <br />this ehannel reach shows ephemeral flow characteristics. The channel bottom is above the <br />water table and the channel flows only for short periods following precipitation events, <br />otherwise it is dry. <br />A review of the historic hydrogrephs indicates instantaneous peak flows ranged from 0.03 <br />to 0.5 cfs. Mean spring and summer flows ere 0.72 cfs end 0.007 cfs, respectively. <br />Si[e YSSF2 is located downstream from YSS3 below the Y-1 pond outf all in Section 19, R87Y. <br />The site was established in 3/97 and both instantaneous end continuous flow data have been <br />collected et this site to the present. Flow behavior in this reach of the Y-1 tributary <br />is the same es that described for Site YSS3. The only difference in contributing factors <br />• is discharge from Y-1 pond to the channel. The largest peak flows (0.25 to 0.96 cfs) <br />occur in the spring during the snowmelt influenced runoff period. Tabulation of the <br />season flow statistics shows mean flow rates of 0.12 cfs in the spring and 0.025 cfs in <br />the summer. Flow volumes measured 'in 7993 ere 33 times es greet in the spring es in the <br />summer. <br />Annand Draw. Site TSAF4 is located in Annand Drew in the SY'A of Section 8, RB7Y (see <br />Exhibit 7-1). Both instantaneous end Continuous flow date are collected et this site. <br />Instantaneous flow monitoring was initiated in 5/91 and continuous flow date was fSrst <br />collected in 3/92. Flow in the channel reach of Annand Draw monitored by Site YSA F4 can <br />be described as Intermittent end is similar to that described for Sites YSS3 and YSSF2 in <br />Y-1 tributary, The early end mid-spring flows are predominantly from melting of the <br />snowpac k, while the lest spring and early summer flows are a combination of flow from bank <br />storage, runoff from precipitation events because the ground is already fully saturated or <br />partially frozen, end perched spring flow largely recharged by snowmelt. The channel <br />reach during the remainder of each year exhibits ephemeral flow characteristics. The <br />channel bottom during these periods is above the water table and the channel flows only <br /> for short periods following precipitation events. <br /> From a review of the flow hydrogrephs, the period of snowmelt influence appears to start <br />99 <br />