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HGDALS and HGDAL2, HGTI will discuss with CDMG the utility of monitoring stream water quality in Dry Creek immediately above Walker Ditch to determine whether the alluvial aquifer increases at the Loadout pose any spatially significant stream water quality and use potential problems immediately above the flood irrigated fields fed by Walker Ditch. The stream water quality adjacent to and immediately below the Loadout is marginally suitable for livestock use. water quality trend analyses previously described will be utilized to determine if persistent concentration changes are occurring that might exceed the livestock use standards. Persistent degradation changes to Dry Creek at Site HGS D3 will be considered significant if livestock standards are exceeded, thus precluding the potential water use. These impact trend analyses will be performed annually and submitted as part of the annual hydrologic data reports. The trend analyses require a minimum of four data points, so the first such analyses will not be performed until 1995. Surface Water Monitoring. Surface water monitoring at Sites HGSD1 and HGSD3 will be conducted semiannually (high snowmelt flow period between April and June and low flow period between September and November). Parameters to be measured semiannually include instantaneous discharge, field water quality parameters (pH, temperature, and conductivity) and the parameter suite presented in Table 13-1, Surface Water Parameter Long List. The surface water parameter suite (see Table 13-1) has been revised. Monitoring for acidity, aluminum, barium, fluoride, phosphate and molybdenum has been discontinued. These parameters are not listed in the stream standards set forth by the Colorado Department of Public Health and Environment (CDPHE) in Regulation 33, Classification and Numeric Standards for Upper Colorado River Basin (Yampa River Segments 13d and 13e). There are also no agricultural standards for these parameters 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. Finally, for similar reasons, the form of iron analyzed will be "total recoverable". Sample analyses will be performed by a contract laboratory certified by the State of Colorado. Tx-06 8 Revised 05/05