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ranges from about 750 to 3,350 ft3/yr (0.24x104 to 1.1x10-0 ft3/s). Flow in the Arkansas River ranges from <br />about 50 to 6,000 ft'/s leading to dilution of groundwater from the site by a factor of about 0.45 million to 250 <br />million. Therefore, discharge of groundwater from the Site likely will have a negligible impact on the quality of <br />water in the Arkansas River. <br />2.3 Site Hydrology <br />Surface water bodies within the Permit area at the Site include Bear Creek and minor drainages tributary to the <br />Arkansas River (Figure 2). Beaz Creek is identified as an intermittent stream on the 1975 USGS topographic <br />map of the Florence quadrangle. The Bear Creek drainage covers an area of approximately five squaze miles <br />and includes a portion of the town of Penrose, farming communities, and the Portland quarry site. Land uses <br />within the basin are a mix of rural residential, agriculture, open range and grasslands, and limestone quarrying. <br />Upstream of the Permit boundary, irrigation return flow contributes a small amount of flow to the upper reaches <br />of Bear Creek during periods of irrigation. A discharge of 0.25 cubic feet per second (cfs) was measured in <br />Bear Creek at a point south of Highway 50 near the upstream Permit boundary of the Site in November 2000. <br />There may be no flow at all in Beaz Creek at this upstream Permit boundary during periods of no irrigation, as <br />was observed during the period from December 2000 through Apri12001. Due to an extended period of drought <br />conditions, there has been no reported flow in the upper reach of Bear Creek at least since the summer of 2002. <br />Flow from this upper portion of Bear Creek will be diverted to a location outside the Permit area. Details of the <br />diversion design can be found in the 112 Permit Amendment Application Permit No. M-77-344 (Holcim, 2002). <br />As it flows through the Site, Bear Creek becomes increasingly incised into the underlying limestone bedrock. <br />Flow in this portion of Beaz Creek is derived primarily from the inflow of groundwater where the stream has <br />intersected perched groundwater in the limestone. In November 2000, a discharge of 2.57 cfs was measured in <br />Bear Creek just upstream of the confluence with the Arkansas River. In October 2002, after an extended period <br />of drought conditions, stream discharge at this point was less than about 0.5 cfs. The effect of storm flow on <br />stream water discharge in Bear Creek has not been characterized. In the future, Bear Creek will be mined <br />through and will no longer exist. Mitigation of lost wetlands is being address by the U.S Army Corps of <br />Engineers 404 Permit. <br />BLASLAND, 8000K 8. LEE, INC. <br />12I13ro2 enginee/s 8 sclera/is l5 &3 <br />Crtowdwater MonimrinB Plm Il.dot <br />