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3. TEXT CHANGES <br />Page 3-6 <br />(11, A) <br />Column 1, paragraph 2, sentence 2: "From the lower <br />Mahogany to :' should read: "From the middle <br />Mahogany to ...:' <br />(11, A) <br />Column 1, paragraph 2, sentence 3: "...these secondary <br />effects are less ...:' should read: "...these secondary <br />effects, though they exist, are less ...:' <br />(11) <br />Colttmn 1, paragraph 6, sentences 4 and 5: "Thru thin <br />....elastic properties:' should read: "Three thin (2-3 feet <br />thick each) beds of low yield clay rich many shale stone <br />occur above [he Boies Bed in the L-5 Zone. These beds <br />are known az the "rubber beds" because of their plastic <br />behavior when unconfined. Experience obtained during <br />drilling indicates that these beds probably could seal small <br />cracks in the rock by swelling into the crack. The beds <br />appear to be continuous over the area of the well field." <br />(11, A) <br />Column 2, paragraph 2 {full), sentence 1: "... up to <br />the lower Mahogany Zone ... :' should read: "... up <br />to the middle Mahogany Zone ...:' <br />Page 3-8 <br />(11) <br />Column 1, paragraph 1, sentence 4: "Although the <br />leached zone below ...:' should read: "Although the R- <br />6 Zone below ...:' <br />Page 3-8 through 3-14 <br />(6 thru 14, A) <br />Section 3.4, Water Resources has been reprinted. <br />3.4 WATER RESOURCES <br />3.4.1 Sttrface Water <br />3.4.1. f Surface Water Quantity <br />The sodium leases lie within the Piceance hydrologic basin. <br />Piceance and Yellow creeks, which both drain into the While <br />River, are the principal drainages within this basin. <br />Surface runoff in the Piceance Basin is from snowmelt <br />during spring months and high-intensity summer thunder- <br />storms. Most annual flow from Piceance and Yellow creeks <br />is sustained by groundwater discharge. The groundwater <br />discharge to surface flows has been estimated to be 80 percent <br />of the total Flow of these creeks (Weeks et al. 1974}. <br />Recharge to the groundwater system is principally from <br />snowmelt. Snow accumulates during the winter months at <br />elevations in excess of 7,000 feet. snowmelt produces a <br />period of high streamflow during the spring (Weeks et al. <br />1974). Table 3-1 summarizes the principal characteristics <br />of the two streams. <br />Different periods of record are available for the two <br />streams; therefore, the numbers presented in Table 3-1 are <br />not directly comparable. The flow from Yellow Creek is <br />more ertatic than the Flow From Piceance Creek, and the <br />majority of the surface flow leaving the Piceance Bazin comes <br />from Piceance Creek. <br />The drainage system within the sodium lease area is <br />characterized by a series of intermittent and ephemeral <br />streams; rolling uplands; steep valley sideslopes; and short, <br />narrow, relatively flat valley bottoms near Yellow Creek. <br />Steep slopes, coupled with intense storms, have resulted in <br />localized mass-wazting of land forms along the upper and <br />middle channel reaches, leading to the accumulation of <br />alluvial fill and the creation of alluvial Cans at the conFluence <br />of drainages within Yellow Creek. In many sections, the <br />channel bottom is on sandstone and shale bedrock. The <br />channel gradient of the tributary drainages throughout the <br />lease area averages 2.5 percent. <br />The sodium lease tract area drains into two streams, <br />Yellow Creek and Piceance Creek (Map 3-2). The majority <br />of the area (96.5 percent) is drained by the Yellow Creek <br />watershed, and the remainder {3.5 percent) is drained b}' <br />the upper portion of Horse Draw, a tributary to Piceance <br />3-2 <br />