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<br />SUbject: <br /> <br />"Hydrology of a Nuclear-Processing Plant Site, Rocky Flats, Jefferson County, <br />Colorado," U.S. Geological Survey (USGS) Open-File Report 76-268. March <br />1976, <br /> <br />This report contains credible and well-researched information derived from a hydrologic, <br />geohydrologic, and geologic investigation of the Rocky Flats Plant site. The study was done <br />for the Atomic Energy Commission to determine how contaminants from an accidental spill <br />might be distributed as they move through the hydrologic system. <br /> <br />Information gathering for this report included geologic mapping, test drilling, surface and <br />borehole geophysical measurements, collection of well data, and installation of three stream <br />gages, three rain gages, and a stream sediment sampler. <br /> <br />Limitations <br /> <br />General <br /> <br />1. <br /> <br />Considerable Core Area and Buffer Zone construction has taken place since <br />the time of this report which would tend to change some of the hydrologic <br />characteristics of the basins. <br /> <br />2. The period of record for the rain and stream gages is limited to two years. <br /> <br />Data Included <br /> <br />1. Daily rainfall data for three stations at Woman Creek, Walnut Creek, and the <br />Core Area are provided for the period of April to October from 1972 to 1974. <br />There are some periods of no record. <br /> <br />2. Daily stream flow data for Walnut Creek, South Walnut Creek, and Woman <br />Creek are provided. The period of record of the gages varies. The period of <br />record is generally mid-1972 to rnid-1974. <br /> <br />3. The runoff from precipitation is approximately 1.4 percent. There was <br />insufficient data to calculate the percent runoff from rainfall for intense <br />thunderstorms. The rainfall-runoff relationship for Woman Creek is presented <br />in Figure 4 of the document. <br /> <br />4. <br /> <br />Graphs showing cumulative precipitation for seven different storms are <br />presented in Plate 3 of the document. <br /> <br />5. <br /> <br />The soil infiltration rate is significant. It is quoted from two sources as 0.2-6.0 <br />inches/hour and 3.9-7.35 inches/hour. <br /> <br />6. <br /> <br />Drainage basin data, including basin delineation, area, slope, and length are <br />presented in Plate 2 and Table 1 of the document. <br /> <br />7. <br /> <br />Extensive geologic data and interpretations for the plant site are presented. <br />These data include information on stratigraphy, bedrock formations, surficial <br />deposits, and geologic structure. <br /> <br />1. <br /> <br />This report is particularly useful in understanding the nature of rainfall-runoff <br />relationships and the interaction of surface water and groundwater. Helpful <br />illustrations are given. II <br /> <br />