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Marcb 2007 Hayrien Gulcb I~arlau! - 2006 Annual 3.0 HYDROLOGIC MONITORING 3.1 SAMPLING AND MEASURING TECHNIQUES Field measurements were recorded for conductivity, pH and temperature. Surface water flow was measured with a Swoffer Mode12100 portable velocity meter, or visually estimated. Static groundwater level measurements were taken with an electronic water level indicator. Field conductivity and pH meters were calibrated prior to each days use. The conductivity meter was calibrated using a potassium chloride solution with an electrical conductivity in the 413 to 6,668 miao- Siemens per centimeter (µS/cm) range. The pH meter was calibrated using NBS traceable buffers with pH values of 7.0 and 10.0 units. Surface water and groundwater samples collected for laboratory analysis were collected using standazd industry practices and U.S. Environmental Protection Agency guidance to assure the data is representative of the water resource being observed. Table 1, CDPS Permit COG-850008 Analytical Lirt, presents the pazameter list Eor the sediment pond outfall samples. Table 3, Surface Water Analytical Lirt, shows the laboratory analyses for the surface water samples. Table 4, GmundwaterAnalytical List, presents the laboratory analyses foz the groundwater samples. Analyses were performed by ACZ Laboratories, Inc. (ACZ) of Steamboat Springs, Colorado. ACZ performs all analyses by U.S. Environmental Protection Agency (EPA) or equivalent methods. The surface water analytical suite was modified during 2005 as pazt of Technical Revision No. 6 (TR- O6), which the CDRMS approved in June, 2005. The analytical suite was modified as part of TR-OG to assure compliance with CDPHE regulations which were amended in January 2004 (Regulation 33) and Mazch 2005 (Regulation 31). With the approval of TR-06, sample analyses For aciditp, aluminum, barium, fluoride, molybdenum and phosphate have been discontinued because these pazameters aze not listed in the stream standazds set forth by the CDPHE in Regulation 33, Classification and Numeric Standazds Eor Upper Colorado River Basin (Yampa Rives segments 13d and 13e). There aze also no agricultural standazds for these constituents in Regulation 31, Basic Standards for Surface Water. The "analytical technique" for cadmium, copper, lead, manganese, nickel, selenium, silver and zinc has been changed from "total recoverable" to "potentially dissolved." This is the technique mandated by the CDPHE in Regulations 31 and 33. For similar reasons, the form of iron analyzed was changed to "total recoverable." Finally, the analytical technique fot mercury is total, not "total recoverable" as had been reported in previous annual hydrology reports. 3.2 SURFACE WATER DATA 3.2.7 Colorado Wastewater Discharge Permit System (CDPS) Monitoring There aze two sediment ponds that aze regulated in accordance with the Colorado Wastewater Discharge Permit System. The ponds aze identified as the Truck Loop Pond (Outfall OOlA), and the Rail Loop Pond (Outfall 002A). The locations of the two sediment ponds aze shown on Figure 1, Manitanng Site Lacationr. Discharge from both ponds was observed in 2006 for the fast time in several yeazs. Table 2, Summary of Sediment Pant CPDS Manitanng, presents a summary of the CDPS monitoring observations for 2006. Appendix A, CDPS Water Quality Data, includes a listing of water quality statistics for the Loadout CDPS sites. Hydro-Environmental Solutions, Inc. P.O. Box 772996 57 108 Street, Suite B Steamboat Springy, CO 80477 (970) 871-6125