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<br />The Site mission has changed from nuclear weapons production to SNM management. waste managemen~ <br />and environmental restoration. Nearly every building is anticipated to be decontaminated and <br />decommissioned over a period of several years; presenting the potential for release of additional <br />contamination from the Site. <br /> <br />Setting: <br />. Rocky Flats Environmental Technology Site, Golden. Colorado <br />. 6550 total acres: 640 acres of industrialized area surrounded by 5910 acres of Buffer Zone. <br />. Intermontane climate with 15 inches average annual precipitation. <br />. Native tall grass prairie, riparian woodland, upland wetland, and aquatic deep-water habitats. <br />. Drainage of interest for this study: <br />Walnut Creek, a perennial stream with 0.10 cfs basef!ow with annual yield ofabout 100 acre-feeL <br />, <br /> <br />Figure 1. Location of hydrologic features and stream gaging and storm water monitoring <br />stations at Rocky FIaIs. <br /> <br /> <br />J'-'-- "--.--'-- ;J--- <br /> <br />LEGEND <br /> <br />-:::' <br /> <br />A GQ.QlflQ ard Sanc'.lng <br />. S1:Q:tlon <br /> <br />l <br /> <br />../'-- StreQl'lS, ~t;c"es, <br />.. DrttiOClge: F'~o..tlK'e~ <br /> <br />- S\?curl"ty f\1r:G~ <br /> <br />-$- PreCipl"tQ.tlon Gfl.gO? <br /> <br />~ <br /> <br /> <br />\ <br />~ <br /> <br />. <br /> <br />tEET <br /> <br />Rrt:TS i <br />Ga.gii1g Sta-':jQii ~E";:YG6(:! <br />StOI"M!'fo.te-r <br />Monltor-lng LocCl. tlons <br />IJ.I"Id P,..eoplta.tlon Gc:Lge~ <br /> <br />L_________ __._._.___._ H_. ---- --.--."-- <br /> <br />I <br />1750 3500 i <br /> <br />_ .m ._____.......___... ___If:::.,; <br /> <br />Depending on storm intensity and duration, Pu-239,240 can be difficult to detect in Site stormwate,. <br />Therefore, sampling on the rising limb of the hydrograph is done to maximize the potential for delecti..,g tbe <br />Pu-239,240 without dilution. The investigation described herein was developed to determine radionuc!ide <br />removal characteristics of the wet detention facilities, and to design stormwater control protocol to ens"re <br />that pond operations produce water quality in compliance with State stream standards. <br />