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Last modified
1/26/2010 2:21:28 PM
Creation date
10/12/2006 1:27:45 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8274.400
Description
Colorado River Basin Salinity Control - General Basinwide Salinity Issues - NPDES
Basin
Colorado Mainstem
Water Division
5
Date
9/1/1995
Author
Applied Hydrology
Title
Salinity Control Study - NPDES Permit No. CO - 0042161 - Prepared for Twentymile Coal Company
Water Supply Pro - Doc Type
Report/Study
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<br />r, <br /> <br />NPDE$ Permit No. CO-0042161 <br />Salinity Control Study <br /> <br />TwentymiIe Coal Company <br /> <br />/-of. <br />/-4 <br />l'V <br />W <br /> <br />2.0 Salt Loading Analysis Approach <br /> <br />The salt loading of the 00 I Outfall was analyzed for this report using data from discharge <br />monitorlng reports for the last four and one half years (April, 1990 through September, 1994). <br />Discharge from this point began in 1989. .. <br /> <br />Discharged salt impacts were evaluated in terms of salt loading (salt mass release rate, in tons <br />per day) land IDS concentration (mglL) in the receiving stream. <br /> <br />Data us~ in the analysis include discharge flow rate, IDS concentr,ation and specific <br />conductabce. Specific conductance measurements were used to estimate IDS when IDS was <br />not analYzed. Site specific relationships between IDS and field specific conductance were <br />derived ~r the discharge point 001 (Station 115) and upstream and downstream monitoring <br />stations 616 and 1(02), by regression from analyzed IDS and field specific conductance at each <br />location, ~ Scatter plots showing these regression relationships for each of these stations are <br />provided ,in Appendix I. <br /> <br />Measure4 flow, IDS, and field specific conductance for each of these stations are provided in <br />Appendix: II. Laboratory results for specific conductance (shaded cells) are reported in place <br />of field nieasurements in the tables when available. Specific conductance measurements were <br />used to eStimate IDS when the latter was not analyzed. <br /> <br />The salt mass loads at each discharge point are also included in Appendix II.' The salt loads <br />are calculated from IDS concentration and the measured flow as: <br /> <br />salt load (tons/day) = IDS (mglL) x discharge rate (cfs) * 0.0026915; <br /> <br />where <br />the factor,(O,0026915) adjusts for the indicated units of concentration (mg/I), flow (cfs) aM <br />load (tons(day). When a flow measurement was reported for a given date but neither IDS or <br />specific cOnductance measurements were reported, IDS was estimated as the average of the <br />IDS values in preceding and subsequent monitoring dates. <br /> <br />Measured ;f1ows, IDS concentrations, and calculated salt loads for each monitoring date were <br />averaged dver each month through the period from April, 1990 through September, 1994, and <br />the monthly averages are shown in Table 1 as baseline conditions at the discharge point 001 <br />(Station 11'5) and at the upstream monitoring point on Fish Creek (Station 16), Note that flows <br />and conce~trations are not typically included for the months October through March because <br />the monitoring stations are usually frozen over during these months. <br /> <br />The salt load, in Fish Creek below the discharge point is estimated in Table 2 by adding <br />average m~nthly flows and salt loads for the discharge and for Station 16, and compared with <br />data measured at Station 302 downstream of the mixing wne for the discharge outfalL The <br />estimated monthly average IDS concentration in Fish Creek downstream of the outfall in <br />Table 2 is ~alculated from the average monthly flow and salt loading below the diScharge point <br />as: <br /> <br />AHA F'lleoamc: 14SA1.CN1.DOC <br /> <br />Page 8 <br /> <br />11,59 AM 09n9/95 <br /> <br />. ! <br />tU;~ <br />
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