REP17148

• Permit No: C1992081
• IBM Index Class Name: Report
• Doc Date: 3/30/2006
• Doc Name: 2005 Annual Hydrology Report
• From: Hydro-Environmental Solutions Inc
• To: DMG
• Annual Report Year: 2005
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

March 2006 Hayrkn Gukh Loadout - 2005.4nnua(Hydro(ogy Report ~ Page 4
Per the requirements of the CDPS pemit COG-850008 quarterly Dischazge Monitoring Reports
(DMRs) were submitted to the appropriate regulatory agencies under separate cover. For
completeness purposes, copies of the 2005 DMRs aze provided in Appendix B, CDPS Discharge
Moxitarixg ReporYt.
3.2.2 Stream Monitoring
Two stream monitoring locations were sampled in the vicinity of the Loadout along Dry Creek.
Permit specified monitoring consists of semi-annual (spring and fall) monitoring for flow and water
quality.
The upstream surface watu monitoring site (HGSDI) is located approximately 0.5 miles upstream of
the Loadout pemut boundary. This site is located on Dry Creek just downstream of Routt County
Road 53. The downstream surface water monitoring site (HGSD3) is located on Dry Creek within the
rail loop, downstream of the Loadout facility azea. A third location (HGSD2), which is downstream of
where the rail spur transitions to the rail loop and of HGSD3, was abandoned in 1995. The locations
of [he current and former surface water monitoring stations aze shown on Figure 1, Monitoring Site
L,ocatioxr.
The spring runoff monitoring event occurred on May 20, 2005. The fall monitoring event was
conducted on October 20, 2005, and both Dry Creek locations were sampled.
Surface water quality data for 2005 are included in Appendix C, Surface WaterQuality Data. A review of
the laboratory analyses for samples collected during the May monitoring event shows that the surface
water constituents from HGSDI and HGSD3 are similar to previous years. In general, the potentially
dissolved concentrations were similaz to the total recoverable values. Constituents that historically
were not detected in the total recoverable form were also generally not detected in the potentially
dissolved form.
The HGSDI sample collected in May had a new maximum concentration for total recoverable iron
(3.04 milligrams per liter [mg/1]), however, this value is significantly less than the previous maximum
total iron concentration (5.68 mg/1). This HGSDI sample also had a new maximum total recoverable
manganese concentration (0.92 mg/1) -this value is slightly higher than the maximum total manganese
concentration (0.79 mg/1).
The October sample collected at HGSD3 had a new maximum concentration for total recoverable
iron (0.96 mg/1), however, this value is significantly less than the previous maximum total iron
concentration (5.79 mg/1). This sample also had a new maximum total recoverable manganese
concentration (0.7 mg/1), which is higher than the maximum total manganese concentration (0.35
mg/1).
The Colorado Department of Public Health and Environment has established use classifications and
numeric standards fox Dry Creek in Regulation 33, Classification and Numeric Standazds for Upper
Colorado River Basin (Yampa River Segment 13d). Classified stream uses aze agriculture, recreation
la and aquatic life warm 2. The primary water use for Dry Creek is agriculture (both irrigation and
livestock watering); however, the CDPHE also detennuted there is a reasonable chance of primary
contact recreation as a water use, and consequently, classified the stream as recreation class 1a. The
aquatic life warm 2 classification is based on a finding that Dry Creek is not capable of sustaining a
wide variety of aquatic life, primarily because of physical habitat limitations -stretches of the creek aze
intermittent and water temperatures in the summer frequently approach 30 °C. Because agriculture is
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Steamboat Spn~rrgt, CO 80477
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