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APPENDIX A

PROJECT LOCATION

Project Area

Location

Lower Beaver Brook Environmental Assessment Section 14, T4S, R72W; 6th PM

UTM NAD 83: Zone 13N; 464742mE, 4395114mN

Longitude 105.411292°W, Latitude 39.705159°N USGS Squaw Pass, CO Quadrangle Clear Creek County, Colorado 0

750

1,500 Feet

Figure 1 Vicinity Map

Prepared for: Lookout Mountain Water District File: 10365 Figure 1.mxd (GS) October 19, 2018

Portions of this document include intellectual property of ESRI and its licensors and are used herein under license. Copyright © 2018 ESRI and its licensors. All rights reserved.

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APPENDIX B

WETLANDS DELINATION REPORTT

Denver • Durango • Hotchkiss • Idaho www.eroresources.com

Consultants in Natural Resources and the Environment

Wetland Delineation Report Lower Beaver Brook Dam Project Clear Creek County, Colorado

Prepared for—

Lookout Mountain Water District 1202 Bergen Parkway, Suite 215 Evergreen, Colorado 80439 (303) 526-2025

Prepared by—

ERO Resources Corporation 1842 Clarkson Street Denver, Colorado 80218 (303) 830-1188 ERO Project #10365

November 16, 2018

http://www.eroresources.com/

i ERO Project #10365 ERO Resources Corporation


Contents

Introduction .......................................................................................................................... 1

Location ................................................................................................................................. 1

Summary of Ecological Setting ................................................................................................ 3

Project Area Description......................................................................................................... 3

Methods ................................................................................................................................ 5 Wetland Delineation ........................................................................................................................ 5 Wetland Classification ...................................................................................................................... 6 Jurisdictional Determination ............................................................................................................ 7

Description of Wetlands and Other Waters ............................................................................. 7 Streams and Open Water ................................................................................................................. 8 Wetlands .......................................................................................................................................... 8 Wetland 1 ......................................................................................................................................... 8 Wetland 2 ......................................................................................................................................... 9 Wetlands 3 and 4 ............................................................................................................................. 9 Wetland 5 ......................................................................................................................................... 9 Wetland 6 ....................................................................................................................................... 10 Wetlands 7 and 8 ........................................................................................................................... 11

References ........................................................................................................................... 11

Tables

Table 1. Wetland area, Cowardin classification, and hydrogeomorphology (HGM) ....................... 8

Figures

Figure 1. Vicinity Map ...................................................................................................................... 2 Figure 2. Existing Conditions ........................................................................................................... 4

Appendices

Appendix A Photo Log Appendix B Routine Wetland Determination Datasheets Appendix C Plant Species List Appendix D Soil Map

1 ERO Project #10365 ERO Resources Corporation


November 16, 2018

Introduction

The Lookout Mountain Water District (District) retained ERO Resources Corporation (ERO) to provide a wetland delineation along sections of Beaver Brook upstream and downstream of Lower Beaver Brook Reservoir, in Clear Creek County, Colorado (project area; Figure 1). The District is proposing a dam improvement project, and the proposed project is predicted to inundate or result in the placement of dredged or fill material into wetlands and other waters that are subject to U.S. Army Corps of Engineers (Corps) jurisdiction. ERO assessed the project area for potential isolated wetlands, jurisdictional wetlands, and other waters of the U.S.

The Clean Water Act (CWA) was passed by the U.S. Congress in 1972 to protect the chemical, physical, and biological quality of waters of the U.S. The Corps’ Regulatory Program administers and enforces Section 404 of the CWA. Under Section 404, a Corps permit is required for the discharge of dredged or fill material into waters of the U.S., including wetlands. The Corps defines waters of the U.S. as “all navigable waters and their tributaries, all interstate waters and their tributaries, all wetlands adjacent to these waters, and all impoundments of these waters.” As a result of a series of Supreme Court rulings, the Corps issued guidance stating that the Corps considers traditionally navigable waters (TNWs), wetlands adjacent to TNWs, and tributaries to TNWs that are relatively permanent waters (RPWs) and their abutting wetlands jurisdictional waters. Other wetlands and waters that are not TNWs or RPWs will require a significant nexus evaluation to determine their jurisdiction. A significant nexus evaluation assesses the flow characteristics and functions of a tributary and its adjacent wetlands to determine if they significantly affect the chemical, physical, or biological integrity of downstream TNWs.

Location

The project area is in Section 14, Township 4 South, Range 72 West of the 6th Principal Meridian in Clear Creek County, Colorado (Figure 1). The UTM coordinates of the approximate center of the project area are 464742mE, 4395114mN of NAD 83 Zone 13N. The longitude/latitude of the project area is 105.411292°W/39.705159°N. The elevation of the project area ranges from approximately 7,815 feet to 7,915 feet above sea level.

Project Area

Location

Lower Beaver Brook Environmental Assessment Section 14, T4S, R72W; 6th PM

UTM NAD 83: Zone 13N; 464742mE, 4395114mN

Longitude 105.411292°W, Latitude 39.705159°N USGS Squaw Pass, CO Quadrangle Clear Creek County, Colorado 0

750

1,500 Feet

Figure 1 Vicinity Map

Prepared for: Lookout Mountain Water District File: 10365 Figure 1.mxd (GS) October 19, 2018

Portions of this document include intellectual property of ESRI and its licensors and are used herein under license. Copyright © 2018 ESRI and its licensors. All rights reserved.

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Summary of Ecological Setting

The U.S. Department of Agriculture (USDA) maps the project area within the central part of the Southern Rocky Mountains Major Land Resource Area (MLRA). This MLRA is characterized by strongly sloping mountain ranges, with basins, high mesas, and plateaus between the mountain belts (USDA, Natural Resources Conservation Service [NRCS] 2006). This MLRA is part of the Southern Rocky Mountains Province of the Rocky Mountain System and ranges in elevation from 6,500 to 14,400 feet. The climate of the MLRA depends on elevation, with greater precipitation and cooler temperatures at higher elevations. The average annual precipitation is between 7 and 63 inches, half of which occurs as snow during the winter. The mean annual temperature is between 26°F and 54°F, and the number of frost-free days ranges from 45 to 230.

The project area is further divided into the Crystalline Mid-Elevation Forests ecoregion of Colorado (Chapman et al. 2006). The geology of the Crystalline Mid-Elevation Forests ecoregion consists largely of crystalline and metamorphic substrates. This ecoregion is located within the South Platte River watershed of Colorado, and streams flow from southwest to northeast, off the Continental Divide. The South Platte River eventually flows into the Missouri River. Most of the tributaries that flow into the South Platte River watershed contain riparian corridors dominated by deciduous woodlands and transitional shrubs and grasslands.

The majority of the ecoregion is located in the eastern half of the Southern Rockies. The vegetation is dominated by aspen, ponderosa pine, Douglas-fir, lodgepole pine, and limber pine, with an understory of shrubs, grasses, and wildflowers. The primary land use in this region includes wildlife habitat, livestock grazing, logging, mineral extraction, recreation, and growing residential subdivisions.

Project Area Description

The project area is bounded by Beaver Brook Canyon Road to the north, Hideaway Circle to the east, and open space to the west and south in Clear Creek County (Figure 1). Beaver Brook runs through the project area and is located upstream and downstream of Lower Beaver Brook Reservoir in the center of the project area (Figure 2). Photo points of the project area are shown on Figure 2, and the photo log is in Appendix A.

ERO Project #10365 3 ERO Resources Corporation

&

&

Wetland 8 (0.004 ac)

Wetland 6 (0.066 ac) DP6 !..!


P6 P5 !.

& DP7 P1

DP5 .! Wetland 5 (0.050 ac)

DP4

Lower Beaver Brook

Reservoir


Wetland 3 (0.014 ac) P4


Wetland 1 (0.005 ac) P3 .!

P2

DP3

!. DP2

.! DP1

Image Source: Google Earth©, May 2018

Lower Beaver Brook Environmental Assessment Figure 2 !. Data Point

Photo Point

Limit of Delineation

Ordinary High Water Mark (0.117 ac)

Open Water (2.286 ac)

Wetland (0.158 ac)

±

Existing Conditions

Prepared for: Lookout Mountain Water District

Project Area Boundary 0 100 200 Feet

File: 10365 Figure 2.mxd (GS) October 31, 2018

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Most of the project area consists of coniferous forests, with an understory of shrubs and grasses. The woody vegetation is dominated by mountain mahogany (Cercocarpus sp.), Ponderosa pine (Pinus ponderosa), Douglas-fir (Pseudotsuga menziesii), quaking aspen (Populus tremuloides), American plum (Prunus americana), common juniper (Juniperus communis), Woods’ rose (Rosa woodsii), and blue spruce (Picea pungens) (Photos 1 through 4). The herbaceous understory consists primarily of redtop (Agrostis gigantea), red bearberry (Arctostaphylos uva-ursi), aster (Aster sp.), prairie junegrass (Koeleria macrantha), needle and thread (Hesperostipa comata), smooth brome (Bromus inermis), intermediate wheatgrass (Thinopyrum intermedium), and Sierran false needle grass (Ptilagrostis kingii) (Photos 1 through 6). A few small wetlands are located along Beaver Brook and are dominated by Nuttall’s sunflower (Helianthus nuttallii), Emory’s sedge (Carex emoryi), bluejoint (Calamagrostis canadensis), speckled alder (Alnus incana), park willow (Salix monticola), red osier (Cornus alba), broadleaf cattail (Typha latifolia), sandbar willow (Salix exigua), fringed willow herb (Epilobium ciliatum), fowl manna grass (Glyceria striata), and dewy-stem willow (Salix irrorata).

Methods

Wetland Delineation On October 18, 2018, Clint Henke and Anica Sunshine with ERO surveyed the project area for potential isolated wetlands, jurisdictional wetlands, and other waters of the U.S. (2018 site visit). Before the 2018 site visit, ERO reviewed U.S. Geological Survey (USGS) quadrangle topographic maps and aerial photographs to identify mapped streams and areas of open water that could indicate wetlands or waters of the U.S.

ERO conducted the wetland delineation following the methods for routine on-site wetland determinations in areas of less than 5 acres as described in the 1987 Corps of Engineers Wetlands Delineation Manual (Environmental Laboratory 1987) and used methods in the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coastal Region (Version 2.0) (Corps 2010) to record data on vegetation, soils, and hydrology on routine determination forms (Appendix B). The Corps defines wetlands as “areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, marshes, bogs, and similar areas” (33 Code of Federal Regulations [CFR] 328.2[c]). Wetland boundaries were determined by a visible change in vegetation community, soils, topographic changes, and other visible distinctions between wetlands and uplands.

The wetland indicator status of plant species was identified using the National Wetland Plant List (Lichvar et al. 2016), taxonomy was determined using Flora of Colorado (Ackerfield 2015) and Colorado Flora: Eastern Slope (Weber and Wittmann 2012), and nomenclature was determined using the PLANTS Database (USDA, NRCS 2018a). Commonly occurring plant species in the project area, including the wetland indicator status, are listed in Appendix C. If present, hydric soils were identified using field observation for hydric soil indicators accepted by the Corps. Soil data were not always collected if



hydrophytic vegetation and hydrology were present and did not appear altered (Environmental Laboratory 1987). In addition, soil data were not collected in conditions where there was a clear lack of hydrology and hydrophytic vegetation indicators. Where soil data were collected, a Munsell soil color chart was used to determine soil color.

Intermittent, ephemeral, and perennial drainages with characteristics of a defined streambed, streambank, ordinary high water mark (OHWM), and other erosional features also were identified. The OHWM identifies the lateral jurisdictional limits of nonwetland waters of the U.S. Federal jurisdiction over nonwetland waters of the U.S. extends to the OHWM, defined in 33 CFR 328.3 as “the line on the shore established by fluctuations of water and indicated by physical characteristics such as a clear, natural line impressed on the bank, shelving, changes in the character of the soil, destruction of terrestrial vegetation, the presence of litter and debris, or other appropriate means that consider the characteristics of the surrounding areas.” The Corps defines “stream bed” as “the substrate of the stream channel between the OHWMs. The substrate may be bedrock or inorganic particles that range in size from clay to boulders.”

The boundaries of identified wetlands and other characteristics of potential waters of the U.S. were mapped using a Trimble Global Positioning System (GPS) unit. Data were differentially corrected using the CompassCom base station. All differential correction was completed using Trimble Pathfinder Office 5.4 software. GPS data were incorporated using ESRI® ArcGIS Desktop software. Additionally, where appropriate, wetlands were drawn on georectified aerials and then digitized.

Wetland Classification Delineated wetlands were classified according to the U.S. Fish and Wildlife Service’s (Service) Cowardin classification system (Cowardin et al. 1979) combined with a hydrogeomorphic (HGM) approach (Brinson 1993). The HGM approach assesses the chemical, physical, and biological functions of wetlands based on their geomorphic setting, water source, and hydrodynamics. HGM classes found in Colorado are mineral soil flats, organic soil flats, riverine, lacustrine fringe, slope, and depressional. The Cowardin classification uses a hierarchical structure of systems, subsystems, and classes to classify both wetlands and deepwater habitats. Wetlands with persistent or nonpersistent vegetation are classified in the Cowardin system as palustrine, which typically includes wetlands referred to as marshes, fens, wet meadows, and sloughs. The palustrine system also includes small, shallow, permanent, or intermittent water bodies such as ponds. Palustrine wetlands may be situated shoreward of lakes and river channels, on river floodplains, in isolated catchments, or on slopes (Cowardin et al. 1979). Under the palustrine system, wetlands are classified as emergent (erect, rooted, herbaceous, and usually perennial hydrophytes that remain standing until at least the next growing season), scrub-shrub (woody vegetation less than 20 feet tall), or forested (woody vegetation 20 feet or taller). In wetlands where more than one wetland type occurs, the wetland type of the largest area is used. For example, an area that is predominantly palustrine emergent (PEM) wetlands but also contains a small amount of palustrine scrub-shrub (PSS) wetlands would be categorized as PEM wetlands. Because of the limited



occurrence of the smaller wetland types within the larger wetland polygons, these areas were not separated out within the delineated polygons.

The Cowardin riverine system includes wetlands and deepwater habitats contained within a channel, except wetlands dominated by trees, shrubs, and emergent vegetation. The riverine system usually contains flowing water and is bounded on the landward side by uplands, channel banks, or other wetlands. Within the riverine system, wetlands are divided into the tidal, lower perennial (low gradient and slow water), upper perennial (high gradient and fast water), and intermittent subsystems. Within these subsystems, riverine wetlands are further classified as unconsolidated bottom, aquatic bed, streambed, rocky shore, unconsolidated shore, and emergent wetland (nonpersistent). During the wetland delineation, ERO classified the wetlands as palustrine emergent and palustrine scrub-shrub but did not classify open waters or streams.

Jurisdictional Determination To assist the Corps in making a preliminary jurisdictional determination, ERO reviewed the proximity and potential surface water connection of wetlands to known jurisdictional waters of the U.S. using aerial photo interpretation, landowner information, and information from the wetland survey. Within the project area, wetlands were distinguished as isolated, abutting or adjacent to a TNW, or abutting or adjacent to a tributary to a TNW. Abutting wetlands are not separated from a TNW or tributary by uplands, a berm, a dike, or a similar feature. Adjacent wetlands are bordering, contiguous, or neighboring a TNW or tributary and may be separated from a TNW or tributary by uplands, a berm, a dike, or similar feature. Wetlands or waters that have a surface water connection to the South Platte River may provide more than a speculative or insubstantial effect on the chemical, physical, or biological integrity of a TNW. The following sections contain information on potential surface water connections of wetlands and other waters within the project area.

Description of Wetlands and Other Waters

ERO assessed the project area for wetlands and other waters as described below. Data were collected from various locations in the project area to document the characteristics of uplands and wetlands and the transition areas between them. Each data point was given a label that corresponds to a location shown on Figure 2 and routine wetland determination forms in Appendix B. The following sections contain information on potential surface water connections of wetlands and other waters within the project area. Table 1 provides a summary of the mapped areas, including Cowardin classification and HGM for each wetland. Approximately 2.403 acres of open water and stream channel and 0.158 acre of wetlands occur in the project area (Figure 2).



Table 1. Wetland area, Cowardin classification, and hydrogeomorphology (HGM).

Water/Wetland ID Longitude Latitude Feature Size (acres)

Cowardin Classification HGM

Wetland 1 105.411747 39.703891 0.005 PEM/PSS Riverine Wetland 2 105.411484 39.703993 0.007 PEM/PSS Riverine Wetland 3 105.410611 39.704554 0.014 PEM/PSS Lacustrine Wetland 4 105.410573 39.704703 0.006 PEM/PSS Lacustrine Wetland 5 105.410971 39.706149 0.050 PEM/PSS Riverine Wetland 6 105.411369 39.706183 0.066 PEM/PSS Riverine Wetland 7 105.411214 39.706285 0.006 PEM/PSS Riverine Wetland 8 105.410955 39.707091 0.004 PEM Riverine

Beaver Brook N/A (linear feature)

N/A (linear feature)

0.03 Stream Riverine

Lower Beaver Brook Reservoir

105.410988 39.705177 2.286 Reservoir Lacustrine

PEM = palustrine emergent; PSS = palustrine scrub-shrub

Streams and Open Water The project area is in Hydrologic Unit 101900040401. Beaver Brook is shown as a perennial stream on the USGS Squaw Pass, Colorado, topographic quadrangle (Figure 1). North Beaver Brook flows into Beaver Brook in the northwest corner of the project area. Beaver Brook consists of a 4- to 6-foot-wide channel throughout the project area (Photos 2 and 3). Beaver Brook flows into Clear Creek approximately 5.11 miles northeast of the project area. Clear Creek eventually flows into the South Platte River. North Beaver Brook is shown on the USGS Squaw Pass, Colorado, topographic map and was flowing east into Beaver Brook in the project area during the 2018 site visit.

Wetlands Wetland 1 Wetland 1 (Data Point [DP] 3; Photo 2) is located on a wide terrace along the western bank of Beaver Brook in the southern portion of the project area. Wetland 1 is located upstream of Lower Beaver Brook Reservoir and consists of a 3- to 5-foot-wide wetland fringe.

Vegetation Emergent and scrub-shrub wetlands were delineated in the project area south of Lower Beaver Brook Reservoir. The vegetation in Wetland 1 is dominated by speckled alder, Ponderosa pine, juniper, park willow, bluejoint, and fowl blue grass (Poa palustris). Other vegetation observed includes quaking aspen, Douglas-fir, blue spruce, Woods’ rose, and Emory’s sedge. At DP3, the vegetation met the dominance test for hydrophytic vegetation. DP3 also met the prevalence index for hydrophytic vegetation.



Soils Soil types in the project area have been identified by the NRCS Soil Surveys for Clear Creek County, Colorado. The NRCS mapped one primary soil association in Wetland 1 (USDA, NRCS 2018b; Appendix D). The soils were mapped as Tahana-Legault-Rock outcrop complex, 30 to 70 percent slopes.

The soils at DP3 were assumed hydric due to the data point meeting the dominance test and prevalence index for hydrophytic vegetation requirements. See Appendix B for additional details on soil for this data point.

Hydrology Hydrology indicators were observed at DP3. Secondary hydrology indicators at DP3 included geomorphic position and the FAC-Neutral test.

Wetland 2 Wetland 2 is located on a wide terrace along the western bank of Beaver Brook in the southern portion of the project area (Photo 3). Wetland 2 is located upstream of Lower Beaver Brook Reservoir and consists of a 5- to 8-foot-wide wetland fringe. Emergent wetlands were delineated in the project area south of Lower Beaver Brook Reservoir. The vegetation in Wetland 2 is dominated by American cow- parsnip (Heracleum maximum), Nuttall’s sunflower, Emory’s sedge, and bluejoint. Other vegetation observed includes Woods’ rose.

Wetlands 3 and 4 Wetlands 3 and 4 are located along the eastern shore of Lower Beaver Brook Reservoir in the eastern portion of the project area (Photo 4). Wetlands 3 and 4 consist of 3- to 5-foot-wide emergent wetland fringes and are located above the OHWM of the Reservoir. The vegetation in Wetlands 3 and 4 is dominated by redtop, speckled alder, and bluejoint.

Wetland 5 Wetland 5 (DP4 and DP5) is in a small inundated depression along Beaver Brook, adjacent to the northern edge of the Lower Beaver Brook Reservoir dam structure in the northern portion of the project area (Photo 5). Wetland 5 is located downstream of Lower Beaver Brook Reservoir and is fed by water from the Reservoir.

Vegetation Emergent and scrub-shrub wetlands were delineated in the project area north of Lower Beaver Brook Reservoir. The vegetation in Wetland 5 is dominated by broadleaf cattail, willow, and red osier. Other vegetation observed includes Baltic rush (Juncus arcticus subsp. ater), redtop, fowl manna grass, fringed willow herb, Emory’s sedge, and Canada thistle (Cirsium arvense). At DP4, the vegetation met the dominance test and prevalence index for hydrophytic vegetation. DP5 consisted primarily of upland species and did not meet the dominance test for hydrophytic vegetation.



Soils Soil types in the project area have been identified by the NRCS Soil Surveys for Clear Creek County, Colorado. The NRCS mapped one primary soil association in Wetland 5 (USDA, NRCS 2018b; Appendix D). The soils were mapped as Mammoth-Ohman-Rock outcrop complex, 30 to 60 percent slopes.

The soils at DP4 were assumed hydric due to the data point meeting the dominance test and prevalence index for hydrophytic vegetation requirements, as well as the presence of inundated conditions. The soils at DP5 were assumed nonhydric due to a lack of hydrophytic vegetation. See Appendix B for additional details on soil for these data points.

Hydrology Hydrology indicators were observed at DP4. Primary hydrology indicators at DP4 included surface water to a depth of 5 inches. A lack of hydrology at DP5 was assumed due to a lack of hydrophytic vegetation.

Wetland 6 Wetland 6 (DP6 and DP7; Photo 6) is in a small inundated depression, adjacent to the northern edge of the Lower Beaver Brook Reservoir dam in the northern portion of the project area. Wetland 6 is located downstream of Lower Beaver Brook Reservoir and is fed by seepage from the Reservoir dam.

Vegetation Emergent and scrub-shrub wetlands were delineated in the project area north of Lower Beaver Brook Reservoir. The vegetation in Wetland 6 is dominated by sandbar willow, fringed willow herb, and fowl manna grass. Other vegetation observed includes curly dock (Rumex crispus), Canada thistle, and Woods’ rose. At DP7, the vegetation met the dominance test and prevalence index for hydrophytic vegetation. DP6 consisted primarily of upland species and did not meet the dominance test for hydrophytic vegetation.

Soils Soil types in the project area have been identified by the NRCS Soil Surveys for Clear Creek County, Colorado. The NRCS mapped one primary soil association in Wetland 6 (USDA, NRCS 2018b; Appendix D). The soils were mapped as Mammoth-Ohman-Rock outcrop complex, 30 to 60 percent slopes.

The soils at DP7 were assumed hydric due to the data point meeting the dominance test and prevalence index for hydrophytic vegetation requirements, as well as the presence of inundated conditions. The soils at DP6 were assumed nonhydric due to a lack of hydrophytic vegetation. See Appendix B for additional details on soil for these data points.

Hydrology Hydrology indicators were observed at DP7. Primary hydrology indicators at DP7 included surface water to a depth of 1 inch. A lack of hydrology at DP6 was assumed due to a lack of hydrophytic vegetation.



Wetlands 7 and 8 Wetlands (Wetlands 7 and 8) were delineated along Beaver Brook downstream of the Reservoir dam in the northern portion of the project area. Wetland 7 is fed by water from the Reservoir and is dominated by sandbar willow and dewy-stem willow. Wetland 8 consists of a 3-foot wetland fringe along the western edge of Beaver Brook and is dominated by bluejoint.

References

Ackerfield, J. 2015. Flora of Colorado. 1st edition. Botanical Research Institute of Texas. Fort Worth, TX.

Brinson, M.M. 1993. A hydrogeomorphic classification of wetlands. Technical Report WRP-DE-4, U.S. Army Engineers Waterways Experiment Station, Vicksburg, MS.

Chapman, S.S., G.E. Griggith, J.M. Omernik, A.B. Price, and D.L. Schrupp. 2006. Ecoregions of Colorado (color poster with map, descriptive text, summary tables, and photographs): Reston, VA, U.S. Geological Survey (map scale 1:1,200,000). ftp://ftp.epa.gov/wed/ecoregions/co/co_front.pdf.

Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deepwater habitats of the United States. Department of the Interior, U.S. Fish and Wildlife Service, Office of Biological Services Program. No. FWS/OBS-79/31.

Environmental Laboratory. 1987. Corps of Engineers Wetland Delineation Manual, Technical Report 7- 87-1, U.S. Army Engineer Waterways Experiment Station. Vicksburg, MS.

Lichvar, R.W., D.L. Banks, W.N. Kirchner, and N.C. Melvin. 2016. The National Wetland Plant List: 2016 wetland ratings. Phytoneuron 2016-30:1-17. Published April 28, 2016. ISSN 2153 733X. Last accessed October 31, 2018.

U.S. Army Corps of Engineers (Corps). 2010. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coasts Region (Version 2.0). U.S. Army Research and Development Center. Vicksburg, MS.

U.S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS). 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. Agriculture Handbook 296. Washington, DC: U.S. Department of Agriculture.

U.S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS). 2018a. The PLANTS Database. http://plants.usda.gov. National Plant Data Team, Greensboro, NC 27401-4901 USA. September 1.

U.S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS). 2018b. Department of Agriculture. http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx. Last accessed September 1.

Weber, W.A., and R.C. Wittmann. 2012. Colorado Flora: Eastern Slope. 4th edition. University Press of Colorado. Boulder, CO.

ftp://ftp.epa.gov/wed/ecoregions/co/co_front.pdf

http://plants.usda.gov/

http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx


ERO Project #10365 ERO Resources Corporation

Appendix A Photo Log

PHOTO LOG WETLAND DELINEATION REPORT – LOWER BEAVER BROOK DAM PROJECT

CLEAR CREEK COUNTY, COLORADO

OCTOBER 18, 2018

Photo 2 ‐ View of fringe wetlands (Wetland 1) along Beaver Brook upstream of the Reservoir. View is to the southwest.

Photo 1 ‐ Overview of vegetation downstream of the Lower Beaver Brook Reservoir dam structure in the northern

portion of the project area. View is to the north.



OCTOBER 18, 2018

Photo 4 ‐ Overview of the Reservoir and abutting wetlands (Wetlands 3 and 4) on the opposite edge of the Reservoir. View is to the northeast.

Photo 3 ‐ View of fringe wetlands (Wetland 2) along Beaver Brook upstream of the Reservoir. View is to

the southwest.



OCTOBER 18, 2018

Photo 6 ‐ Overview of wetlands (Wetland 6) adjacent to the Reservoir dam structure, in the northern portion of the project area. View is to the southwest.

Photo 5 ‐ Overview of wetlands (Wetland 5) adjacent to the Reservoir dam structure, in the northern portion of

the project area. View is to the north.



Appendix B Routine Wetland Determination Datasheets

WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region

Lower Beaver Brook Dam Clear Creek County 10/18/18 Project/Site: City/County: Sampling Date:

US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0

Applicant/Owner: Lookout Mountain Water District State: CO

Sampling Point: DP-1

Investigator(s): C. Henke, A. Sunshine

Landform (hillslope, terrace, etc.): terrace

Section, Township, Range: Section 14, T4S, R72W; 6th PM

Local relief (concave, convex, none): none

Slope (%): 1%

Subregion (LRR): E Lat: 39.702760059 Long: 105.413076283 Datum: NAD83

Soil Map Unit Name: Tahana-Legault-Rock outcrop complex, 30 to 70 percent slopes

Are climatic / hydrologic conditions on the site typical for this time of year? Yes ✔ NWI classification: none

No (If no, explain in Remarks.)

Are Vegetation , Soil , or Hydrology significantly disturbed? Are “Normal Circumstances” present? Yes ✔ No

Are Vegetation , Soil ✔ , or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present? Yes ✔ No

Hydric Soil Present? Yes No ✔

Wetland Hydrology Present? Yes No ✔

Is the Sampled Area within a Wetland? Yes No ✔

Remarks:

Upland terrace adjacent to Beaver Brook. VEGETATION – Use scientific names of plants.

Absolute Dominant Indicator

Tree Stratum (Plot size: 30' x 30' ) % Cover Species? Status

1. Populus tremuloides 5 Y FACU

2. Picea pungens 5 Y FAC

3.

4. 10 = Total Cover

Sapling/Shrub Stratum (Plot size: 15' x 15' )

1. Salix monticola 20 Y OBL

2. Prunus americana 15 Y FACU

3. Picea pungens 5 N FAC

4. Alnus incana 10 N FACW

5. Juniperus communis 3 N UPL

53 = Total Cover

Herb Stratum (Plot size: 5' x 5' )

1. Arctostaphylos uva-ursi 1 N FACU

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

1 = Total Cover

Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover % Bare Ground in Herb Stratum

Dominance Test worksheet: Number of Dominant Species

That Are OBL, FACW, or FAC: 2 (A)

Total Number of Dominant

Species Across All Strata: 4 (B)

Percent of Dominant Species

That Are OBL, FACW, or FAC: 50 (A/B)

Prevalence Index worksheet: Total % Cover of: Multiply by:

OBL species 20 x 1 = 20

FACW species 10 x 2 = 20

FAC species 10 x 3 = 30

FACU species 21 x 4 = 84

UPL species 3 x 5 = 15

Column Totals: 64 (A) 169 (B)

Prevalence Index = B/A = 2.64

Hydrophytic Vegetation Indicators: 1 - Rapid Test for Hydrophytic Vegetation

2 - Dominance Test is >50%

✔ 3 - Prevalence Index is ::3.01

4 - Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet)

5 - Wetland Non-Vascular Plants1

Problematic Hydrophytic Vegetation1 (Explain) 1Indicators of hydric soil and wetland hydrology must

be present, unless disturbed or problematic.

Hydrophytic Vegetation

✔ Present? Yes No

Remarks:


SOIL Sampling Point: DP-1

Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type1 Loc2 Texture Remarks

1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3: Histosol (A1) Sandy Redox (S5) 2 cm Muck (A10)

Histic Epipedon (A2) Stripped Matrix (S6) Red Parent Material (TF2)

Black Histic (A3) Loamy Mucky Mineral (F1) (except MLRA 1) Very Shallow Dark Surface (TF12)

Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Other (Explain in Remarks)

Depleted Below Dark Surface (A11) Depleted Matrix (F3)

Thick Dark Surface (A12) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and

Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) wetland hydrology must be present,

Sandy Gleyed Matrix (S4) Redox Depressions (F8) unless disturbed or problematic.

Restrictive Layer (if present): Type: Rock

Depth (inches): 2"

Hydric Soil Present? Yes No ✔ Remarks:

Soils problematic; restrictive rock layer at 2".

HYDROLOGY

Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1) Water-Stained Leaves (B9) (except Water-Stained Leaves (B9) (MLRA 1, 2, High Water Table (A2) MLRA 1, 2, 4A, and 4B) 4A, and 4B) Saturation (A3) Salt Crust (B11) Drainage Patterns (B10)

Water Marks (B1) Aquatic Invertebrates (B13) Dry-Season Water Table (C2)

Sediment Deposits (B2) Hydrogen Sulfide Odor (C1) Saturation Visible on Aerial Imagery (C9)

Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) Geomorphic Position (D2)

Algal Mat or Crust (B4) Presence of Reduced Iron (C4) Shallow Aquitard (D3)

Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) FAC-Neutral Test (D5)

Surface Soil Cracks (B6) Stunted or Stressed Plants (D1) (LRR A) Raised Ant Mounds (D6) (LRR A)

Inundation Visible on Aerial Imagery (B7) Other (Explain in Remarks) Frost-Heave Hummocks (D7)

Sparsely Vegetated Concave Surface (B8)

Field Observations: Surface Water Present? Yes No ✔ Depth (inches):

Water Table Present? Yes No ✔

Depth (inches):

Saturation Present? Yes No ✔ Depth (inches): (includes capillary fringe)


Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

Did not contain any apparent primary or secondary indicators. Failed FAC-Neutral test.



Project/Site: Lower Beaver Brook Dam

Applicant/Owner: Lookout Mountain Water District

City/County: Clear Creek County

State: CO

Sampling Date: 10/18/18






Slope (%): 1%












Remarks:

Upland terrace adjacent to Beaver Brook. VEGETATION – Use scientific names of plants.



1. Alnus incana 25 Y FACW

2. Picea pungens 20 Y FAC

3.

4. 45 = Total Cover


1. Salix sp. 10 Y FACW

2.

3.

4.

5. 10 = Total Cover


1. Poa palustris 70 Y FAC

2. Aster sp. 3 N NI

3.

4.

5.

6.

7.

8.

9.

10.

11.

73 = Total Cover


1.

2.

















✔ 2 - Dominance Test is >50%







✔ Present? Yes No

Remarks:




0-5 10YR 2/2 100 SaClLo










Restrictive Layer (if present): Type: Rock

Depth (inches): 5"


Soils problematic; restrictive rock layer at 5".

HYDROLOGY













Depth (inches):




Remarks:






State: CO







Slope (%): 1%












Remarks:

Wetland terrace on west bank of Beaver Brook. VEGETATION – Use scientific names of plants.



1. Alnus incana 20 Y FACW

2. Populus tremuloides 5 N FACU

3. Pinus ponderosa 10 Y FACU

4. Pseudotsuga menziesii 5 N FACU

40 = Total Cover


1. Picea pungens 5 N FAC

2. Rosa woodsii 5 N FACU

3. Juniperus communis 10 Y UPL

4. Salix monticola 10 Y OBL

5. 30 = Total Cover


1. Calamagrostis canadensis 60 Y FACW

2. Poa palustris 20 Y FAC

3. Carex emoryi 5 N OBL

4.

5.

6.

7.

8.

9.

10.

11.

85 = Total Cover


1.

2.
























✔ Present? Yes No

Remarks:













Restrictive Layer (if present): Type: Cobble/Rock

Depth (inches): 0"

Hydric Soil Present? Yes ✔ No Remarks:

Soils problematic; restrictive cobble/rock layer at 0". Soils assumed based on prevalence of hydrophytic vegetation and hydrology indicators.

HYDROLOGY





Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) ✔ Geomorphic Position (D2)


Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) ✔ FAC-Neutral Test (D5)






Depth (inches):


Wetland Hydrology Present? Yes ✔ No


Remarks:

Low terrace.






State: CO




Landform (hillslope, terrace, etc.): depression


Local relief (concave, convex, none): concave

Slope (%): 1%


Soil Map Unit Name: Mammoth-Ohman-Rock outcrop complex, 30 to 60 percent slopes







Hydric Soil Present? Yes ✔ No


Is the Sampled Area within a Wetland? Yes ✔ No

Remarks:

Wetland abutting Lower Beaver Brook Reservoir. VEGETATION – Use scientific names of plants.



1.

2.

3.

4. 0 = Total Cover


1. Salix sp. 5 Y FACW

2. Cornus alba 5 Y FACW

3.

4.

5. 10 = Total Cover


1. Typha latifolia 75 Y OBL

2. Juncus arcticus 1 N OBL

3. Agrostis gigantea 5 N FAC

4. Glyceria striata 5 N OBL

5. Epilobium ciliatum 5 N FACW

6. Carex emoryi 5 N OBL

7. Cirsium arvense 2 N FAC

8.

9.

10.

11.

98 = Total Cover


1.

2.
























✔ Present? Yes No

Remarks:













Restrictive Layer (if present): Type:

Depth (inches):


Hydric soils assumed based on inundated conditions.

HYDROLOGY


✔ Surface Water (A1) Water-Stained Leaves (B9) (except Water-Stained Leaves (B9) (MLRA 1, 2,

High Water Table (A2) MLRA 1, 2, 4A, and 4B) 4A, and 4B) Saturation (A3) Salt Crust (B11) Drainage Patterns (B10)









Field Observations: Surface Water Present? Yes ✔ No Depth (inches): 5"

Water Table Present? Yes No Depth (inches):

Saturation Present? Yes No Depth (inches): (includes capillary fringe)



Remarks:






State: CO




Landform (hillslope, terrace, etc.): berm


Local relief (concave, convex, none): convex

Slope (%): 1%





Are Vegetation , Soil , or Hydrology significantly disturbed? Are “Normal Circumstances” present? Yes ✔ Are Vegetation , Soil , or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

No


Hydrophytic Vegetation Present? Yes No ✔




Remarks:

Upland berm adjacent to wetland depression. VEGETATION – Use scientific names of plants.



1.

2.

3.

4. 0 = Total Cover


1. Cercocarpus sp. 5 Y UPL

2.

3.

4.

5. 5 = Total Cover


1. Hesperostipa comata 30 Y UPL

2. Koeleria macrantha 30 Y UPL

3. Aster sp. 5 N NI

4. Achillea millefolium 2 N FACU

5. Phleum pratense 2 N FAC

6. Elymus canadensis 15 N FAC

7. Ribes inerme 3 N FAC

8.

9.

10.

11.

98 = Total Cover


1.

2.


















3 - Prevalence Index is ::3.01





Hydrophytic Vegetation ✔ Present? Yes No

Remarks:














Depth (inches):


Non-hydric soils assumed based on prevalence of upland vegetation.

HYDROLOGY











Field Observations: Surface Water Present? Yes No Depth (inches):





Remarks:

Lack of hydrology assumed, based on prevalence of upland vegetation.






State: CO




Landform (hillslope, terrace, etc.): hillslope



Slope (%): 2%





Are Vegetation , Soil , or Hydrology significantly disturbed? Are “Normal Circumstances” present? Yes ✔ Are Vegetation , Soil , or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

No


Hydrophytic Vegetation Present? Yes No

Hydric Soil Present? Yes No

Wetland Hydrology Present? Yes No

Is the Sampled Area

within a Wetland? Yes No ✔ Remarks:

Upland on hillslope adjacent to wetland depression west of Lower Beaver Brook.

VEGETATION – Use scientific names of plants.



1.

2.

3.

4. 0 = Total Cover


1. 0

2.

3.

4.

5. 0 = Total Cover


1. Heterotheca villosa 10 N UPL

2. Bromus inermis 30 Y UPL

3. Thinopyrum intermedium 30 Y UPL

4. Artemisia campestris 5 N FACU

5. Verbascum thapsus 3 N FACU

6. Centaurea sp. 3 N UPL

7.

8.

9.

10.

11.

81 = Total Cover


1.

2.

= Total Cover

% Bare Ground in Herb Stratum 19

















3 - Prevalence Index is ::3.01





Hydrophytic Vegetation ✔ Present? Yes No

Remarks:














Depth (inches):


Non-hydric soils assumed based on prevalence of upland vegetation.

HYDROLOGY











Field Observations: Surface Water Present? Yes No Depth (inches):





Remarks:

Lack of hydrology assumed, based on prevalence of upland vegetation.






State: CO




Landform (hillslope, terrace, etc.): depression



Slope (%): 2%









Hydric Soil Present? Yes ✔ No


Is the Sampled Area within a Wetland? Yes ✔ No

Remarks:

Wetland from seepage from dam. Base layer consists of rock/riprap.

VEGETATION – Use scientific names of plants.



1.

2.

3.

4. 0 = Total Cover


1. Salix exigua 50 Y FACW

2.

3.

4.

5. 50 = Total Cover


1. Cirsium arvense 5 N FAC

2. Rosa woodsii 2 N FACU

3. Epilobium ciliatum 35 Y FACW

4. Rumex crispus 10 N FAC

5. Glyceria striata 35 Y OBL

6. Salix exigua 5 N FACW

7.

8.

9.

10.

11.

92 = Total Cover


1.

2.
























✔ Present? Yes No

Remarks:













Restrictive Layer (if present): Type: Riprap

Depth (inches): 0"


Problematic soils, restrictive layer of riprap at surface. Hydric soils assumed, based on prevalence of hydrophytic vegetation.

HYDROLOGY


✔ Surface Water (A1) Water-Stained Leaves (B9) (except Water-Stained Leaves (B9) (MLRA 1, 2,

High Water Table (A2) MLRA 1, 2, 4A, and 4B) 4A, and 4B) Saturation (A3) Salt Crust (B11) Drainage Patterns (B10)









Field Observations: Surface Water Present? Yes ✔ No Depth (inches): 1"





Remarks:

Surface water is a combination of dam seepage and water from the outlet.



Appendix C Plant Species List

Commonly occurring plant species in the project area.

Common Name Scientific Name Wetland Indicator Status1 Herbaceous

American cow-parsnip Heracleum maximum Facultative Aster Aster sp. NI Baltic rush Juncus arcticus subsp. ater Facultative wetland Bluejoint Calamagrostis canadensis Facultative wetland Broadleaf cattail Typha latifolia Obligate wetland Canadian thistle Cirsium arvense Facultative Common timothy Phleum pratense Facultative Common yarrow Achillea millefolium Facultative upland Curly dock Rumex crispus Facultative Emory’s sedge Carex emoryi Obligate wetland Fowl blue grass Poa palustris Facultative Fowl manna grass Glyceria striata Obligate Fringed willow herb Epilobium ciliatum Facultative wetland Great mullein Verbascum thapsus Facultative upland Hairy false goldenaster Heterotheca villosa Upland Intermediate wheatgrass Thinopyrum intermedium Upland Knapweed Centaurea sp. Upland Needle and thread Hesperostipa comata Upland Nodding wild rye Elymus canadensis Facultative Nuttall’s sunflower Helianthus nuttallii Facultative wetland Pacific wormwood Artemisia campestris Facultative upland Prairie junegrass Koeleria macrantha Upland Red bearberry Arctostaphylos uva-ursi Facultative upland Redtop Agrostis gigantea Facultative Sandbar willow Salix exigua Facultative wetland Sierran false needle grass Ptilagrostis kingii Facultative upland Smooth brome Bromus inermis Upland White-stem gooseberry Ribes inerme Facultative Woods’ rose Rosa woodsii Facultative upland

Shrubs American plum Prunus americana Facultative upland Blue Spruce Picea pungens Facultative Common juniper Juniperus communis Upland Mountain mahogany Cercocarpus sp. Upland Park willow Salix monticola Obligate wetland Red osier Cornus alba Facultative wetland Sandbar willow Salix exigua Facultative wetland Speckled alder Alnus incana Facultative wetland Woods’ rose Rosa woodsii Facultative upland

Trees Blue spruce Picea pungens Facultative Douglas-fir Pseudotsuga menziesii Facultative upland Ponderosa pine Pinus ponderosa Facultative upland Quaking aspen Populus tremuloides Facultative upland Speckled alder Alnus incana Facultative wetland

1Obligate wetland—Occurs with an estimated 99% probability in wetlands. Facultative wetland—Estimated 67%–99% probability of occurrence in wetlands. Facultative—Equally likely to occur in wetlands and nonwetlands (34%–66% probability). Facultative upland—67%–99% probability in nonwetlands, 1%–33% in wetlands. Upland—>99% probability in nonwetlands in this region. NI—No indicator or no information available. Positive and negative signs are used to more specifically define frequency of occurrence in wetlands; a positive sign indicates a frequency toward the higher end of a category (more frequently found in wetlands), and a negative sign indicates a frequency toward the lower end of a category (less frequently found in wetlands). Source: Ackerfield 2015; Lichvar et al. 2016; USDA, NRCS 2018a; Weber and Wittmann 2012.



Appendix D Soil Map

Soil Map—Georgetown Area, Colorado, Parts of Clear Creek, Gilpin, and Park Counties

Natural Resources Conservation Service

Web Soil Survey

National Cooperative Soil Survey

10/30/2018

Page 1 of 3

39° 42' 25'' N

464500 464560 464620 464680 464740 464800 464860

39° 42' 25'' N

Soil Map may not be valid at this scale.

39° 42' 8'' N

464500 464560 464620 464680 464740 464800 464860

39° 42' 8'' N

Map Scale: 1:2,620 if printed on A portrait (8.5" x 11") sheet.

N 0 35 70 140 Feet

Meters 210

0 100 200 400 600

Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84

4394820

4394880

4394940

4395000

4395060

4395120

4395180

4395240

4395300

105°

24'

51'

' W

105°

24'

51'

' W

105°

24'

34'

' W

105°

24'

34'

' W

4394820

4394880

4394940

4395000

4395060

4395120

4395180

4395240

4395300


Web Soil Survey


10/30/2018

Page 2 of 3


MAP LEGEND MAP INFORMATION

Area of Interest (AOI) Area of Interest (AOI)

The soil surveys that comprise your AOI were mapped at

1:24,000.

Soils

Soil Map Unit Polygons

Soil Map Unit Lines

Soil Map Unit Points

Special Point Features Blowout

Borrow Pit

Clay Spot

Closed Depression

Gravel Pit

Gravelly Spot

Landfill

Lava Flow

Marsh or swamp Mine or Quarry

Miscellaneous Water

Perennial Water

Rock Outcrop

Saline Spot

Sandy Spot

Severely Eroded Spot

Sinkhole

Slide or Slip

Sodic Spot

Please rely on the bar scale on each map sheet for map

measurements.

Source of Map: Natural Resources Conservation Service

Web Soil Survey URL:

Coordinate System: Web Mercator (EPSG:3857)

Maps from the Web Soil Survey are based on the Web Mercator

projection, which preserves direction and shape but distorts

distance and area. A projection that preserves area, such as the

Albers equal-area conic projection, should be used if more

accurate calculations of distance or area are required.

This product is generated from the USDA-NRCS certified data as

of the version date(s) listed below.

Soil Survey Area: Georgetown Area, Colorado, Parts of Clear

Creek, Gilpin, and Park Counties

Survey Area Data: Version 12, Sep 10, 2018

Soil map units are labeled (as space allows) for map scales

1:50,000 or larger.

Date(s) aerial images were photographed: Jul 4, 2010—Oct 16,

2017

The orthophoto or other base map on which the soil lines were

compiled and digitized probably differs from the background

imagery displayed on these maps. As a result, some minor

shifting of map unit boundaries may be evident.

Warning: Soil Map may not be valid at this scale.

Enlargement of maps beyond the scale of mapping can cause

misunderstanding of the detail of mapping and accuracy of soil

line placement. The maps do not show the small areas of

contrasting soils that could have been shown at a more detailed

scale.

Spoil Area

Stony Spot

Very Stony Spot

Wet Spot

Other

Special Line Features

Water Features

Streams and Canals

Transportation

Rails

Interstate Highways

US Routes

Major Roads

Local Roads

Background Aerial Photography


Map Unit Legend

Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI

32 Mammoth-Ohman-Rock

outcrop complex, 30 to 60

percent slopes

14.1 56.8%

56 Tahana-Legault-Rock outcrop

complex, 30 to 70 percent

slopes

10.7 43.2%

Totals for Area of Interest 24.8 100.0%


Web Soil Survey


10/30/2018

Page 3 of 3

Access/Staging/Stockpile-- Existing Access Road, Plan to clear areas adjacent to the access road to allow for staging and stockpiles

New Concrete Dam Construction and Removal of Existing Dam

Temporary Staging/Stockpile in the reservoir pool area

Temporary Diversion Pipeline from Diversion Dam to Water Treatment Plant Pipeline will be above ground

Inflow Measurement Flume(Permanent)

Temporary Diversion Dam(used during construction toprovide water to the Treatment Plant)

Temporary Pool created by the Diversion Dam-- Not planning to remove vegetation in the pool area, temporary inundation of area

Temporary Access Disturbance foraccess to construct diversion/flume Some use for Staging/Stockpile

q 0 100 200

Feet

R:\

18

00

\18

67

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Job. #: 1867.01.01 FIGURE 1

Lower Beaver Brook DamDRAFT Impact Map

NO

VE

MB

ER

20

18

LegendImpact

Permanent

Temporary

DRAFT Info from EROOpen Water

Ordinary High Water Mark

Wetland

Concrete Dam Footprint

DRAFT

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