REV01524 - Laserfiche WebLink

Home Browse Search

-9- The actual extent of unconsolidated alluvial deposits may be a critical factor in the final alluvial valley floor determinations for Foidel Creek. To the extent possible, alluvial deposits should be delineated separately from colluvial deposits. 4../ The application states that information in previously submitted permits provides documentation that unconsolidated deposits on Foidel Creek and South Fork Foidel Creek are not subirrigated. Based on the available information, we are not satisfied that this is the case. Soil, vegetation and alluvial water level information provided for the South Fork and main stem in the vicinity of Pinnacle Peak do not conclusively rule out subirrigation in those areas. In fact, the meadow vegetation type dominated by sedges and rushes (which are typically hydrophytic) would strongly suggest the existence of subirrigation. It is possible that ground water is not accessible to plants during the entire growing season, but that enough water may be available for a long enough time period to exert a significant influence on species composition and plant community productivity. Bi-monthly alluvial well data from 1979 presented in Table 105 of the Eckman Park Permit for AB, AE and AC series wells would seem to support this contention. The application further states that the meadow vegetation type dominated by sedges and rushes is not agriculturally useful. However, information in Twentymile Coal Company's Foidel Creek Permit indicates that similar sedge/rush dominated meadow communities are harvested for hay on Fish Creek and at the confluence of Middle Creek and Foidel Creek. Based on the information discussed above, unconsolidated deposits upstream from the water gap on Foidel Creek to the South Fork confluence and unconsolidated bodies upstream on both the South Fork and main stem would potentially meet geomorphic and water availability criteria based on the presence of unconsolidated deposits and vegetation information which indicates the~resence of agriculturally useful subirrigated vegetation.-/Som'e questio areal extentnt andcontinuity of unconsolidated \t question No.~A''of this section)., f~ final MfF areas-wig-}-be~ttra~e'afte>~tfi~ailuvial mapping Division personnel have conducted site visits areas. ~s remain as to the w~dtFi;~ streamlaid deposits (see e se issues are resolved and to the potential AVF 5. 1/ No information on soil, vegetation or ground water depth has been provided for the unconsolidated deposits immediately downstream from the water gap or upper Foidel Creek in the vicinity of Reservoir No. 1. The only information regarding these areas was the opinion set forth in the Eckman Park application that, based on analysis of color IR photography, areas in the vicinity of Reservoir No. 1 did appear to be subirrigated, while the unconsolidated deposits below the water gap appeared not to be subirrigated. ~fe (~dF z~ 1~S~z~ U p~ab~e~n ,'