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HGDALl and HGDAL2, HGTI will discuss with CDMG the utility of monitoring stream ~ ' <br />water quality in Dry Creek immediately above Walker Ditch to determine whether the <br />alluvial aquifer increases at the Loadout pose any spatially significant stream <br />water quality and use potential problems immediately above the flood irrigated <br />fields fed by walker Ditch. <br />The stream water quality adjacent to and immediately below the Loadout is <br />marginally suitable for livestock use. water quality trend analyses previously <br />described will be utilized to determine if persistent concentration changes are <br />occurring that might exceed the livestock use standards. Persistent degzatlation <br />changes to Dry Creek at Site HGSD3 will be considered significant if livestock <br />standards are exceeded, thus precluding the Potential water use. These impact <br />trend analyses will be performed annually and submitted as part of the annual <br />hydrologic data reports. The trend analyses require a minimum of four data points, <br />so the first such analyses will not be performed until 1995. <br />Surface Water Monitoring. Surface water monitoring at Sites HGSD1 and HGSD3 will <br />be conducted semiannually (high snowmelt flow period between April and June and low <br />fl <br />d bet <br />S <br />t <br />b <br />d N <br />b <br />P <br />i <br />t <br />t <br />d <br />ow per <br />ween <br />ep <br />em <br />er an <br />ovem <br />er). <br />o <br />arame <br />ers <br />o be measure <br />semiannually include instantaneous discharge, field water quality parameters (pH, <br />temperature, and conductivity) and the parameter suite presented in Table 13-1, <br />Surface Water Parameter Long List. The surface water parameter suite (see Table <br />13-1) has been revised. Monitoring Por acidity, aluminum, barium, fluoride, <br />phosphate and molybdenum has been discontinued. Those parameters are not listed in <br />the stream standards sat forth by the Colorado Department o£ Public Health and <br />Environment (CDPHE) in Regulation 33, Classification and Numeric Standards for <br />Upper Colorado River Basin (Yampa River Segments 13d and 13e). There are also no <br />agricultural standards for these parameters in Regulation 31, Basic Standards for <br />Surface Water. The "Analytical Technique" for cadmium, copper, lead, manganese, <br />nickel, selenium, silver and zinc has been changed from "total recoverable" to <br />"potentially dissolved". This is the technique mandated by the CDPHE in <br />R®qulations 31 and 33. For similar reasons, the form of iron analyzed will be <br />"total recoverable". Finally, the analytical technique for mercury is total, not <br />"total recoverable" as previously reported in Table 13-1, and in the Annual <br />Hydrology Reports. Sample analyses will be performed by a contract laboratory <br />h <br />l <br />f <br />e State o <br />orado. <br />certified by t <br />Co <br />TR-06 <br />8 <br />Revised 06/05 <br /> <br />