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. __~ <br />~~~'III ~II ~~IIIIIII <br />United States Department of the Interior <br />I.~' RF.P LY RF:FF:R TO~~ <br />GEOLOGICAL SURVEI' <br />Box °_5046 <br />Ucncer Eedcral Centrr <br />Dcnvrr, Colorado R02°5 <br />Mail Stop #415 , <br />Water Resources Division <br />Colorado District <br />C. T. Illsley <br />Rockwell International <br />Rocky Flats Facility <br />P.O. Box 464 <br />Golden, Colorado 80401 <br />Dear Chuck: <br />June 14, 1979 <br /> <br />Ji;id ~ ~ 19?9 <br />CoIc~IGe `~1N;1 Rrrl,nlli,irlON <br />V ut :: a;u~al r?~sc~~rc°s <br />As I stated in the report "Hydrology of a nuclear-processing plant <br />site, Rocky Flats, Jefferson County, Colorado," (Hurr, 1976, p. 30), <br />"Recharge to the [Laramie-Fox Hills] aquifer occurs along the rather <br />limited outcrop area exposed to surface-water flow and leakage from <br />overlying alluvium." This exposure to surface-water flow includes <br />any water ponded in the clay pits along the trace of the lower <br />Laramie Formation west of the plant site. The source of the ponded <br />water may be direct precipitation, overland runoff, and in the case <br />of Rocky Flats Lake, direct delivery of ditch water. Leakage from <br />saturated alluvium adjacent to the clay pits may also contribute to <br />water in the pits. Because the water in these clay pits is a <br />source of recharge to the Laramie-Fox Hills aquifer, the chemical <br />quality of this water has a direct infl uence on the quality of <br />water in the aquifer. Consequently, any plans which affect the <br />operation, maintenance, or modification of the clay pits should <br />also consider the effect that plan would have on the recharge to, <br />and the water quality of the Laramie-Fox Hills aquifer. <br />Sincerely, <br />FOR THE DISTRICT CHIEF <br />/ e.q <br />R. T. Hurr <br />