PERMFILE46234

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: TAB 07 HYDROLOGIC DESCRIPTION
• Media Type: D
• Archive: No

• Concentrations
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ll of several trace elements have been detected at all four Grassy Creek
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F
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Fe, P
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more standards greater then 1 mg/I (Ba, B, F, Fe, Pb, end Zn), only Fe has been measured
at higher tonte ntrations (7 mg/l et Yells YGAL18, YGAL17, and YGAL15).
Sage Creek. Yells YSAL1, YSAL3, YSALB, end YSAL12 all monitor alluvial water quality
progressing upstream along Sege Creek (see Exhibit 7-1). As in the Grassy Creek drainage,
water quality is variable. YGAL12, located furthest updrainage, typically exhibits e
LeM BNC03504 water type during the fell through spring seasons, and a CeHpHL03 water type
during summer (see Appendix 7-4 end Table 7-12). YSALB, installed approximately 1/4 mile
downstream, exhibits a consistent MgCe504HC03 water type during ell four seasons, although
occasionally bicarbonate exerts more influence (MgCeHC03SO4) during June following
appreciable recharge from snowmelt runoff. Well YSAL3, approximately .5 miles below
TSALB, exhibits anomalous water types compared to ell four Sage Creek alluvial wells,
either Ne504HC03 during the spring and occasionally summer seasons, or NeHC03504 during
fall end winter. TSAL1 exhibits similar water types as YSAL 12, CeNBHC03504 during the
spring through fall and CeNg504 HC03 during the winter.
• TDS values measured in the four Sege Creek alluvial wells range from 344 mg/l at YSAL12 up
to 1146 mg/l at YSALB. Generally, TDS in the Sage [reek alluvium increases as the seasons
progress toward winter following spring snoumeLt. Yith the exception of YSALB, su Lfate
has not exceeded 400 mg/l in Wells YSAL1, YSAL3, or YSAL12. Early sulfate measurements
conducted by the USGS at YSALB (920 to 1200 mg/l) are considered suspect, es PYCC sulfate
analyses conducted since June of 1991 have ranged from 146 to 539 mg/l. Sulfate
concentrations in ell four wells follow the same general seasonal TDS pattern: increasing
following spring snowmelt into winter.
Field pH values measured in the Sege Creek alluvium range from 6.7 up to 8.3 standard
units (S.U.). Wells YSAL1, YSAL3, and YSALB have yielded pN values from 7.0 to 8.1 S.U.
since June of 1990, while at least two measurements collected at YSAL12 since that date
have been less then 7.0 S.U. In general, alluvial ground water along Sege Creek is
slightly alkaline with no distinct seasonal pattern.
Xerdnesa ee CeC03 has ranged from 276 (YSAL3) to 870 mg/l (YSALB). Higher hardness values
• (1400 to 1500 mg/l) measured by the USGS at TSALB prior to 1990 ere considered
unrepresentative; regardless, Sege Creek alluvial ground water is classified es very herd.
Seasonal variations in hardness are evident although slight et Wells YSAL1 end YSALB,
43 Revised 03/01/95