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• Grassy Creek has stream standards and is classifed as usable for recreation <br />(Class 1), agriculture, as a Class I cold water aquatic stream, and as a water <br />supply. Standards exists for pH, dissolved oxygen, fecal coliforms, major cations, <br />and major anions as well as some metals and cyanide. The water quality <br />monitoring in Grassy Creek shows sulfate and bicarbonate as the dominant anions <br />and calcium and sodium+potassium as the dominant cations. Although there are <br />changes in quantities of these parameters from upstream to downstream, these <br />remain the dominant ions. <br />As one result of the lack of consistent flows, there are no known water <br />rights on any of the tributaries discussed above, based on a review of the State <br />Engineer's Office records. The closest surface water rights for any stream are on <br />Beaver Creek and Four Mile Creek, located more than two miles outside of the <br />Amendment No. 8 permit boundary. The primary use of the water on both <br />• streams is for irrigation. There are a number of water rights associated with <br />springs within atwo-mile radius of the Cresson Project. These are shown on <br />Drawing G-2. Only one spring with a water right lies within the boundary of the <br />diatreme as shown on Drawing G-2. No information is available on the extent of <br />flow or use of this spring. Springs outside of the diatreme are not expected to be <br />affected by the Cresson Project due to the distinct boundary effects of the <br />diatreme as discussed in the following section on the ground water system in the <br />region. <br />4.6.1.2 Ground Water <br />Ground water in the District occurs in two distinct hydrologic zones that <br />are strongly controlled by the geologic setting: the volcanic diatreme and the <br />surrounding granitic rocks. A description of the general geology of the region, <br />and specifically the geology beneath project areas was previously provided in <br />• <br />26 <br />