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Table 1. Surface-water gaging stations at the Rocky Flats Environmental Technology Site [Locations of gaging stations are shown in figure 1; USGS, U.s. Geological Survey] Site number Gaglng-stetlon name USGS atatlon Identlllcatlon OSOI OS02 OS03 OS04 OS05 OS06 OS09 OSlO OSI1 OSI6 SW027 SW029 SW093 SW118 SWI34 SW998 395240105095500 395253105095500 395407105095900 395452105113800 395306105131700 395253105131700 395342105110800 395335 IOSll 2700 395403105104700 395301105120800 395313IOSll0500 395310105113300 395349105114900 395347105120900 395331105134400 395332105124600 Woman Creek at Indiana Street Mower Ditch at Indiana Street Walnut Creek at Indiana Street Rock Creek at Highway 128 North Woman Creek at West Buffer Zone Fence Line South Woman Creek at West Buffer Zone Fence Line South Walnut Creek helow Pond B-4 South Walnut Creek ahove B-Series Bypass Wslnut Creek below Pond A-4 Antelope Springs Creek above Woman Creek South Interceptor Ditch above Pond C-2 Pond C- t Walnut Creek below Portal 3 Walnut Creek above Portal 3 Gravel Pit at Rocky Flats T-130 Ditch at McKay Bypass uranium, tritium, gross beta, and gross alpha), metals (dissolved and total recoverable), major ions (dis- solved and total recoverable), nutrients, and organics (volatile and semivolatile organics, and pesticides). The water temperature, pH, and specific conductance of c;:ach sample were measured directly at the time the sample was retrieved from the gaging station. All suspended-sediment samples collected in water year 1996 were analyzed for concentration. Some suspended-sediment samples also were ana- lyzed for sand break (percent sand and percent silt plus clay). Definitions of water-quality terms used in this report are provided in Appendix 2 ("Glossary") at the back of this report. Sample COllection Water-quality samples were collected manually (manual samples) or with automatic samplers (com- posite samples). Manual samples were cOllected at the midpoint of the flow using a grab (or dip) technique. Each sampling site was equipped with an automatic sampler that could collect composite water samples during periods of runoff. The samplers were operated using a flow-paced sampling technique, in which the sampler electronics were programmed to pump dis- crete, equal-volume aliquots of water (usually 24) into a common collection vessel (Isco, Inc., 1990, p. 4-2). The timing for collection of each aliquot was a func- tion of incremental changes in flow volume, as com- puted by the sampler electronics. This technique yields a discharge-weighted sample for which analyti- cal results (constituent concentration) can be used to compute constituent loads for the sampled flow. Most samples (with the exception of the organ- ics and some suspended-sediment samples) were collected as composites with the automatic samplers. Following composite-sample collection, USGS per- sonnel retrieved the samples and reset the automatic samplers for subsequent sampling. Individual chemi- cal-quality and suspended-sediment samples then were split from the composite samples. Additional information concerning sampling methods used by the USGS at the Site is provided by Stevens and others (1975), Guy and Norman (1982), Wershaw and others (1987), Britton and Greeson (1989), Fishman and Friedman (1989), and EG&G Rocky Flats, Incorpo- rated (1992). 4 Surface-Water Quantity and Quality Data, Rocky Flata Environmental Technology Site Near Denver, Colorado, Water Vear 1996