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Riparian Vegetation Mapping

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Riparian Vegetation Mapping RIPARIAN VEGETATION MAPPING IN THE SOUTH FORK AMERICAN RIVER AND LOWER IOWA CANYON CREEK 2010 April 2011 Prepared For: Sacramento Municipal Utility District Power Generation Department 6201 S Street, Mail Stop B355 Sacramento, CA 95817 Prepared By: ECORP Consulting, Inc. 2525 Warren Drive Rocklin, California 95677 TABLE OF CONTENTS 1.0 INTRODUCTION .............................................................................................................. 1 1.1 Site Location ........................................................................................................... 2 1.2 Existing Site Conditions ......................................................................................... 2 2.0 METHODS ......................................................................................................................... 2 3.0 RESULTS AND DISCUSSION ......................................................................................... 3 3.1 Upland Communities .............................................................................................. 3 3.2 Riparian Communities ............................................................................................ 6 3.3 Riparian Vegetation Comparison: 2004-2010 ........................................................ 7 4.0 CONCLUSION ................................................................................................................... 9 5.0 REFERENCES ................................................................................................................. 11 LIST OF TABLES Table 1 – Dominant Species within Each Alliance .........................................................................3 Table 2 – Comparison of Alliance Acreage Between 2004 and 2010 .............................................7 Table 3 - Percent of the Total Vegetation Cover for Each Alliance Type .......................................8 LIST OF FIGURES Figure 1. Project Site and Vicinity Figure 2. Natural Resources Conservation Service Soil Types Figure 3. Vegetation Communities within the Study Area (2010) Figure 4. Vegetation Community Comparison LIST OF ATTACHMENTS Attachment A – 2004 Riparian Vegetation Map prepared by VESTRA Resources, Inc. Sacramento Municipal Utility District Upper American River Project FERC Project No. 2101 1.0 INTRODUCTION At the request of Sacramento Municipal Utility District (SMUD), ECORP Consulting, Inc. (ECORP) conducted a riparian vegetation mapping study in support of the proposed New Slab Creek Powerhouse Project (Project). The Project consists of modification of SMUD’s existing Upper American River Project (UARP), a 688 MW hydroelectric project consisting of eight powerhouses. The smallest is Slab Creek Powerhouse, a 0.4 MW facility lying at the base of Slab Creek Reservoir Dam on the South Fork American River (SFAR). This powerhouse generates power from the 10/36 cfs minimum release requirements under the existing license. Under the new UARP license, higher and more variable minimum releases ranging between 63 and 415 cfs will be released from Slab Creek Reservoir. Preliminary engineering feasibility studies have demonstrated the value of adding a new powerhouse at Slab Creek Reservoir to take advantage of the new minimum releases. However, the size of the release valve at the base of Slab Creek Reservoir Dam, which feeds into the existing powerhouse, limits the volume of water to approximately 260 cfs. Under the new license, SMUD will also provide boating flows below Slab Creek Reservoir of up to 1,500 cfs. Currently, boating flows can only be provided by spilling water over Slab Creek Dam. Alternatively, boating flows could be realized by boring a new hole through the base of the dam and installing a larger pipe and release valve. SMUD has determined the White Rock Tunnel Adit 3, a short tunnel that connects to the White Rock Tunnel, is the optimal location for a new powerhouse that can facilitate the minimum and boating releases required under the new license. Under SMUD’s proposal, a valve inserted into the White Rock Tunnel bulkhead would deliver water into a penstock leading to the new powerhouse at the end of the adit. The powerhouse would be located on the banks of the SFAR, directly downstream of Iowa Canyon Creek. A new bridge crossing the lowermost section of Iowa Canyon Creek would provide vehicular access to the new powerhouse. The purpose of this study was to document existing site conditions (including vegetation communities) and to map the distribution of riparian areas within and immediately downstream of the ¼-mile reach of the SFAR between Slab Creek Dam and the proposed new powerhouse site. The survey area included the stream channel and the adjacent areas within 300 feet (ft) of the normal high-water line. The lower portion of Iowa Canyon Creek, a tributary to the SFAR, was included within this survey area because of the proposed bridge construction across the creek. Current site conditions, vegetation communities, and riparian vegetation mapping results were compared to data collected in 2004 as part of the relicensing studies, to evaluate relative changes in the riparian communities over the six-year period. These data will also be used to document potential changes in the riparian communities during and post construction of the proposed powerhouse and associated discharge structure(s). 2010-026.2 Riparian Surveys/RIP_Veg_Map_Study_v2 1 Sacramento Municipal Utility District Upper American River Project FERC Project No. 2101 1.1 Site Location The Project is located just north of Slab Creek Road and immediately west (downstream) of the Slab Creek Reservoir Dam, in El Dorado County, California (Figure 1. Project Site and Vicinity). The site corresponds to a portion of Section 25, Township 11 North, and Range 11 East (MDBM) of the “Slate Mountain, California” 7.5-minute quadrangle (U.S. Department of the Interior, Geological Survey 1973). The approximate center of the site is located at 38° 46’ 20” North and 120° 42’ 05” West within the South Fork American River Watershed (#18020129, U.S. Department of the Interior, Geological Survey 1978). 1.2 Existing Site Conditions For the purposes of this study, existing riparian vegetation within and immediately downstream of the ¼-mile reach of the SFAR and other upland areas within 300 ft of the normal high water mark (including Iowa Canyon Creek) were evaluated during the summer of 2010. Riparian areas consist of several willow (Salix sp.) and alder (Alnus sp.) dominated vegetation communities. The north and south slopes of the river consists of mature forest communities dominated by ponderosa pine (Pinus ponderosa), canyon live oak (Quercus chrysolepis) and Douglas fir (Pseudotsuga menziesii) and a variety of understory species. All of these communities are described in the Results section. According to the Soil Survey of El Dorado County, California (U.S. Department of Agriculture, Soil Conservation Service 1974), four soil units, or types, have been mapped within the site (Figure 2. Natural Resources Conservation Service Soil Types): (AaF) Acidic rock land, (MbF) Mariposa very rocky silt loam, 50-70% slopes, (McF) Mariposa-Josephine very rocky loams, 50- 70% slopes, and (MmF) Metamorphic rock land. None of these soils units consist of listed hydric components, or contain hydric inclusions (U.S. Department of Agriculture, Soil Conservation Service 1992). 2.0 METHODS Field surveys were conducted on 26 August 2010 by ECORP biologists Debra Sykes and Daria Snider. During this survey, each plant community within the project area was identified based on the Alliance-level CalVeg system for North Sierran - Zone 3 (USDA 2010a and 2010b). The limits of each plant community were delineated onto an ortho-rectified aerial photograph (1:200) and a list of the current conditions of each plant community was recorded. Dominant species within each plant community were noted. Riparian plant community data collected in 2010 was compared to data obtained in 2004 (DTA 2004) as part of the UARP relicensing studies. However, a direct comparison of the 2004 and 2010 data was not possible due to differences in data collection techniques between the two data sets. The 2004 data was collected and mapped on a relatively broad scale using primarily aerial photography, which was later verified by selected ground truthing. This assessment did not include upland alliances located adjacent to riparian areas, which were mapped as barren or 2010-026.2 Riparian Surveys/Rip_Veg_Map_Study_v2 2 Sacramento Municipal Utility District Upper American River Project FERC Project No. 2101 rocky shore. The 2010 community data and mapping was based on community alliance polygons obtained using GPS, and included adjacent upland alliances. To maintain consistency with the total area evaluated in both 2004 and 2010, upland alliance percentages recorded for 2010 are presented but are not compared with the 2004 data which included upland areas as part of barren or rocky shore habitat. Consequently, the 2010 data could not be directly superimposed on the 2004 data; although a comparison of the size, general shape, and location of the vegetation polygons was conducted. Additional details regarding this analysis are presented in the Results and Discussion sections. Upland vegetation community data was not collected in 2004 and as a result, a comparison of upland community data could not be performed. 3.0 RESULTS AND DISCUSSION During the 2010 field survey, ten plant community alliances were documented within
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