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March 2005 Hayden Gukb Loadaut - 2004 Annuat Hydrology Report 1 Poge 4 of the current and foxmer surface water monitoriag stations are shown on Figure 1, Mauitoring Site L ocationr. MWH conducted a monitoring event in January 2004. Data fiom this event was included in the 2003 Annual Hydrology Report. Dry Creek was Ilowing at HGSDl in January and the site was sampled; however, the creek was frozen at HGSD3 and consequently not sampled at this site. The spring mnoff monitoring event, which was also conducted by MWH, occurred on June 1, 2004. Samples were collected at both Dry Creek locations. The Eall monitoring event, which was conducted by Hydro- EnvJronmental occurred on November 2, 2004, and both Dry Creek locations were sampled. Surface water quality data for 2004 are included in Appendix C, Surface Water,Qualaty Data. A review of the laboratory analyses for samples collected during the June monitoring event shows that the surface water constituents from HGSDl and HGSD3 are similar to previous years. New maximum concentrations were recorded at the HGSDl location in January 2004. Calcium (227 mg/1), total recoverable copper (0.03 mg/1), total recoverable molybdenum (0.0071 mg/1) and fluoride (0.5 mg/1) concentrations were greater than previously reported concentrations. Data from the other two monitoring events were within previously observed ranges. The Colorado Department of Public Health and Environment (CDPHE) has established use ' classifications and numeric standazds for Dry Creek in Regulation 33, Classification and Numeric standazds Eor Upper Colorado River Basin (Yampa River Segment 13d). Classified stream uses are agriculture, recreation ]a and aquatic life warm 2. The primary water use for Dry Creek is agriculture ' (both irrigation and livestock watering); however, the CDPHE also determined there is a reasonable chance of primary contact recreation as a water use, and consequently, classified the stream as recreation class la. The aquatic life wazm 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 [he creek are intermittent and water temperatures in the summer frequently approach 30 ~C. HGTI has compiled a list of applicable agriculture water quality criteria. Table 5, Companron of 1004 Surface [Y/ater Quakty to flgnculture Standards, summarizes the applicable standards along with a ' comparison of those standards to 2004 surface water quality data. The following constituent exceeded its respective standazd during 2004; • selenium (a[andazd of 0.018 mg/1): HGSDl - 6/1/04: 0.032 mg/1 The manganese standard of 0.200 mg/1 has often been exceeded at the upstream location, HGSDI during previous sampling events. However, no manganese exceedances were reported during 2003. While sulfate and total dissolved solids (TDS) do not have agriculture standards promulgated in Colorado, the LXtyoming Department of Environmental Quality has established livestock drinking water standazds for these constituents that can be used as benchmazk values to assess the appropriateness of a water for agriculture use. Sulfate and TDS concentrations commonly exceed the WDEQ values. • sulfate (guideline of 500 mg/I) HGSD1 - 1/27/04: 2,040 mg/1; 6/1/04: 1,810 mg/1; and, 11/2/04: 1,350 mg/l HGSD3 - 6/2/04: 3,620 mg/1; 11/2/04: 2,560 mg/1 HGSD • total dissolved solids (guideline of 2,500 mg/1): HGSD1 - 1/27/04: 3,500 mg/l); 6/1/04: 3,210 mg/1 HGSD3 - 6/1/04: 3,620; 11/2/04: 2,560 mg/1 Hydro-Environmental Solutions, Inc. 57 10~a Street, Suite B * P.O. Bax 772996 Steamboat Sprixgr, CO 80477 (970) 846-5112