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HGDALl 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 degzatlation changes to Dry Creek at Site HGSD3 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 fl d bet S t b d N b P i t t d ow per ween ep em er an ovem er). o arame ers o be measure 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 Por acidity, aluminum, barium, fluoride, phosphate and molybdenum has been discontinued. Those parameters are not listed in the stream standards sat forth by the Colorado Department o£ 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 R®qulations 31 and 33. For similar reasons, the form of iron analyzed will be "total recoverable". Finally, the analytical technique for mercury is total, not "total recoverable" as previously reported in Table 13-1, and in the Annual Hydrology Reports. Sample analyses will be performed by a contract laboratory h l f e State o orado. certified by t Co TR-06 8 Revised 06/05