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<br />~, ~ 3 is on a tributary to Rito Seco which is fed from a spring. <br />The water quality of RS-3 is more indicative of groundwater <br /> quality which is the source of the flow, than water quality <br />' in the main portion of Rito Seco. In general, the water in Rito <br /> Seco is good and able to support the existing classification <br />' as a Class 1 Cold Water Aquatic Life stream with Class 1 <br /> Recreational Use and Agriculture Uses. The Receiving Stream <br />i ' Standards also list the use of this stream as a domestic water <br />supply, however, no evidence could be obtained tc support the <br />t use of Rito Seco waters as a domestic water supply. <br />' The single-stage sediment samplers that are installed <br />at each of the six surface water gaging staticns have not <br />sampled any storm events to date. Due to a low snow pack uuring <br />' the 1987-1988 winter season, spring runoff in this area was <br />quite low. A program to attempt to grab suspended sediment <br />' samples during storm events as they occur has recently been <br />instituted. This program will help produce data relative to <br />the existing suspended sediment load during storm events. The <br />sediment load is expected to be quite high in tFiis area due <br />t to the earthen channel and embankment, as well as high runoff <br />from the adjacent watershed. <br />' G.3 Groundwater <br />' G.3.1 Local Geology <br />t The geology in the vicinity of the San Lui<_ Project is <br />composed predominantly of Precambrian age granitic: gneiss and <br />biotite amphibole gneiss. Overlying these rocks are Tertiary <br />age Santa Fe Conglomerate, in places up to 17~)-ft thick, <br />including local alluvium. The Santa Fe Conglomerate is <br />' generally absent above 8,800 ft in elevation over most of the <br />property. <br />1 <br /> <br />G-28 <br />1 <br />