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2010-12-17_REVISION - C1981019 (104)
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2010-12-17_REVISION - C1981019 (104)
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Last modified
8/24/2016 4:28:02 PM
Creation date
12/29/2010 4:19:14 PM
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Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Revision
Doc Date
12/17/2010
Doc Name
Rule 2.04.7 Hydrology Description
Type & Sequence
PR3
Media Type
D
Archive
No
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RULE 2 PERMITS <br />to be dry during subsequent attempts to sample them. Based on the maximum values of sampled <br />spring/seep flows, springs and seeps may contribute an aggregate maximum of approximately 0.75 cfs to <br />surface flows to Collom Gulch. In Jubb Creek, they may contribute up to 0.17 cfs. In Little Collom <br />Gulch, springs and seeps may contribute up to 0.32 cfs, but that discharge is apparently absorbed into <br />valley fill or retained in stock ponds at some point upstream of streamflow sampling location LLCG, <br />which was dry during all sampling attempts. Minimum (summer /fall) spring /seep flow contributions <br />ranged from 0.02 cfs to 0.07 cfs for the watersheds in question. <br />Surface Water Quality — Surface water and spring/seep samples were collected from December 2004 <br />through May 2006 in the Collom Gulch, Little Collom Gulch, and Jubb Creek drainages. The Colorado <br />Mined Land Reclamation Division's ( CMLRD) Guidelines for the Collection of Baseline Water Quality <br />Data were utilized during the baseline monitoring. Water quality sampling and laboratory analyses were <br />conducted in accordance with Rule 2.03.3(4) for analytes defined in Rule 2.04.7(2), and for analytes also <br />listed in the CMLRD Guidelines for the Collection of Baseline Water Quality and Overburden <br />Geochemistry. Field measurements for pH, electrical conductivity, temperature, dissolved oxygen, and <br />flow were taken monthly or semi - annually at stream sampling locations, and semi - annually at springs and <br />seeps, unless prevented by freezing or lack of surface flow. A sample was analyzed for the full suite of <br />recommended water quality constituents monthly at each Collom Gulch stream sampling location, and <br />semi - annually at Jubb Creek and the West Fork of Jubb Creek, except when no flow was present. No <br />water quality samples were taken at Little Collom Gulch or the East Fork of Jubb Creek, which were dry <br />during all sampling events. The seeps and springs were monitored for field parameters semi - annually. A <br />single full -suite sample was collected at each location in June or September 2005, and in a few cases <br />April 2006. <br />Baseline surface water quality monitoring data are presented in Tables 2.04.7 -46 through 2.04.7 -49. <br />These tables include those constituents identified in Rule 2.04.7(2)(b)(ii), except for acidity and dissolved <br />iron, which were not analyzed. Values presented for iron and manganese represent total recoverable <br />concentrations. Hydrographs are presented in figures 2.04.7 -40 to 2.04.7 -43, with total dissolved solids <br />(TDS) included to show seasonal variability with respect to stream flows. The trilinear diagrams in <br />Figures 2.04.7 -44 through 2.04.7 -50 demonstrate the relative proportions of inorganic cations and anions. <br />Each drainage basin is discussed individually below. <br />Collom Gulch — The water quality in Collom Gulch (sample locations UCG and LCG) contains calcium - <br />magnesium or calcium - sodium anions; and bicarbonate - chloride - sulfate cations. The total dissolved <br />solids content ranged from 310 mg/L at to 630 mg/L at UCG, and from 570 mg/L to 830 mg/L at LCG, <br />indicating an increasing trend in TDS concentration in the downstream direction. Average and individual <br />sample TDS values for LCG exceeded the USEPA secondary drinking water standard for TDS of 500 <br />mg/L. The average TDS value for UCG fell below the standard, but some individual values exceeded the <br />standard. When present in detectable quantities, the total recoverable iron concentration for individual <br />samples fell well below the USEPA aquatic life standard of 1.0 mg/L, and the secondary drinking water <br />standard of 0.30 mg/L. Average manganese concentrations at LCG of 0.07 mg/L exceeded the secondary <br />drinking water standard of 0.05 mg/L. <br />Little Collom Gulch — Little Collom Gulch was dry for all attempted sampling events. No water quality <br />data was produced for sampling point LLCG. <br />Jubb Creek — Based on two sample events, the water quality in the mainstem of Jubb Creek (sample <br />location CJC) is dominated by calcium- sodium anions; and a mixture of chloride- sulfate - bicarbonate <br />cations. Water quality in the West Fork of Jubb Creek (WFJC) exhibits a dominance of Calcium and <br />Magnesium anions; and chloride, sulfate, and bicarbonate cations. The total dissolved solids content <br />ranged from 1,750 mg/L at to 1,820 mg/L at CJC, and from 1,030 mg/L to 1,080 mg/L at WFJC, <br />Collom — Rule 2, Page 45 Revision Date: 1/23/09 <br />Revision No.: PR -03 <br />
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