El Dorado Hills 52 Project - edhapac.org

El Dorado Hills 52 ProjectAquatic Resources Delineation Report

November 2020 | AKT-20

Prepared for:

EDH 52, General Partnership7919 Folsom Boulevard, Suite 300

Sacramento, CA 95826

Prepared by:

HELIX Environmental Planning, Inc.1677 Eureka Road, Suite 100

Roseville, CA 95661

El Dorado Hills 52 Project

Aquatic Resources Delineation Report

Prepared for:

EDH 52, General Partnership 7919 Folsom Boulevard, Suite 300

Sacramento, CA 95826

Prepared by:

HELIX Environmental Planning, Inc. 1677 Eureka Road, Suite 100

Roseville, CA 95661

November 2020 | AKT-20

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TABLE OF CONTENTS

Section Page

EXECUTIVE SUMMARY ............................................................................................................................. ES-1

1.0 INTRODUCTION ................................................................................................................................ 1

1.1 Project Location .................................................................................................................. 1 1.2 Driving Directions ................................................................................................................ 1 1.3 Agent Contact information ................................................................................................. 1 1.4 Regulatory Setting............................................................................................................... 2

1.4.1 Waters of the U.S. .................................................................................................. 2 1.4.2 Waters of the State ................................................................................................ 3

2.0 ENVIRONMENTAL SETTING .............................................................................................................. 4

2.1 Location Description ........................................................................................................... 4 2.2 Existing Conditions .............................................................................................................. 4 2.3 Field Conditions .................................................................................................................. 4 2.4 Interstate or Foreign Commerce Connection ..................................................................... 5

3.0 METHODS ......................................................................................................................................... 5

3.1 Data Gathering .................................................................................................................... 5 3.2 Boundaries of the Delineation ............................................................................................ 5 3.3 Determination Procedures ................................................................................................. 5

3.3.1 Delineation Methods ............................................................................................. 5 3.3.2 Determination of Potential Jurisdiction ................................................................. 6 3.3.3 Plant/Habitat Nomenclature ................................................................................. 8

4.0 RESULTS ........................................................................................................................................... 8

4.1 Vegetation Communities/Habitat Types ............................................................................ 8 4.1.1 Non-Native Annual Grassland ................................................................................ 8 4.1.2 Riparian Woodland ................................................................................................ 8 4.1.3 Valley Oak Woodland ............................................................................................ 8 4.1.4 Disturbed/Developed ............................................................................................ 9

4.2 Climate ................................................................................................................................ 9 4.3 Soils ..................................................................................................................................... 9 4.4 Hydrology ............................................................................................................................ 9 4.5 USFWS National Wetlands Inventory ................................................................................. 9

5.0 AQUATIC RESOURCES ...................................................................................................................... 9

5.1.1 Seasonal Wetland ................................................................................................ 10 5.1.2 Seep ..................................................................................................................... 10 5.1.3 Wetland Swale ..................................................................................................... 10 5.1.4 Ephemeral Drainage ............................................................................................ 11 5.1.5 Intermittent Drainage .......................................................................................... 11

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TABLE OF CONTENTS (cont.)

Section Page

5.2 Potential Waters of the U.S. ............................................................................................. 12 5.3 Potential Waters of the State ........................................................................................... 12

6.0 SUMMARY ...................................................................................................................................... 13

7.0 REFERENCES ................................................................................................................................... 14

LIST OF APPENDICES A Figures B Aquatic Resources Delineation Map C List of Plants Observed in the Study Area D Representative Site Photos E Data Sheets

LIST OF TABLES No. Title Page 1 Aquatic Resources in the Study Area ............................................................................................. 12

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ACRONYMS AND ABBREVIATIONS

APN Assessor’s Parcel Number CVRWQCB Central Valley Regional Water Quality Control Board CWA Clean Water Act FAC Facultative Plants FACU Facultative upland plants FACW Facultative wetland plants HELIX HELIX Environmental Planning, Inc. msl mean sea level NRCS Natural Resource Conservation Service OBL obligate wetland plants OHWM Ordinary High Water Mark PCC Prior Converted Cropland RWQCB Regional Water Quality Control Board SWRCB State Water Resources Control Board UPL Upland USACE U.S. Army Corps of Engineers USDA U.S. Department of Agriculture USFWS U.S. Fish and Wildlife Service USGS U.S. Geological Survey WQC Water Quality Certification

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Aquatic Resources Delineation Report for El Dorado Hills 52 | November 2020

ES-1

EXECUTIVE SUMMARY This report presents the results of a delineation of the aquatic resources at the ±36-acre El Dorado Hills 52 site (Study Area), located in western El Dorado County, California. Aquatic resources were identified and delineated following the technical guidelines provided in the Corps of Engineers Wetlands Delineation Manual (USACE Manual) (Environmental Laboratory 1987), the U.S. Army Corps of Engineers (USACE) Arid West Regional Supplement (Supplement) (USACE 2008), the USACE A Field Guide to the Identification of the Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United States (Field Guide) (Lichvar and McColley 2008), and the 2020 Navigable Waters Protection Rule. The Supplement and Field Guide present wetland and OHWM indicators, delineation guidance, and other information that is specific to the Arid West Region.

A total of 0.740 acre of aquatic resources and other waters of the U.S. were mapped within the Study Area. This acreage consists of 0.133 acre of seasonal wetlands, 0.007 acre of seep, 0.006 acre of wetland swale, 0.234 acre of ephemeral drainage, and 0.360 acre of intermittent drainage. Approximately 17.9 acres of the northern portion of the Study Area was previously verified by the USACE in August of 2019 to contain 0.19 acre of waters of the U.S. (SPK-2013-00090). This acreage was carried forward in this delineation.


ES-2



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1.0 INTRODUCTION HELIX Environmental Planning, Inc. (HELIX) prepared this aquatic resources delineation report to present the results of a formal delineation of potential jurisdictional wetlands and other waters of the U.S. and State on the ±36-acre El Dorado Hills 52 Study Area (Appendix A, Figure 1). This report was prepared in accordance with the Minimum Standards for Acceptance of Aquatic Resources Delineation Reports (USACE 2016) and presents the results of HELIX’s review of available literature, aerial photographs, soil surveys, and fieldwork in the Study Area. The purpose of our delineation was to identify aquatic resources on the project site that potentially qualify as waters of the U.S. and/or waters of the State of California. Waters of the U.S. and State on the site are subject to regulatory jurisdiction by the U.S. Army Corps of Engineers (USACE) and the Central Valley Regional Water Quality Control Board (CVRWQCB). Impacts to such resources may require obtaining permits from one or both of these agencies. The results presented in this document are preliminary unless and until concurrence is received from the USACE or the CVRWQCB.

1.1 PROJECT LOCATION

The ±36-acre Study Area is located in El Dorado County north of U.S. Highway 50. It is bifurcated by Silva Valley Parkway and bordered on the west by Clarksville Crossing and on the southeast by Tong Road. The Study Area is located within Township 9 North, Range 8 East, Section 1 of the Clarksville USGS 7.5-minute series quadrangle (Appendix A, Figure 2). The approximate center of the Study Area is at latitude 38.662023° and longitude -121.055946°, NAD 83, and is located at an elevation between 705 feet and 795 feet above mean sea level (msl).

1.2 DRIVING DIRECTIONS

From downtown Sacramento, travel east on U.S. Route 50 for approximately 25 miles, toward El Dorado Hills and exit on Silva Valley Parkway (exit 31) and turn right (south). Travel south on Silva Valley Parkway for approximately 0.2 mile and turn right (north) on Old Silva Valley Parkway and travel approximately 0.3 mile. The Study Area is located on the east side of the road and parking is available on the side of the road or on turnouts.

1.3 AGENT CONTACT INFORMATION

Property Owner: EDH 52 General Partnership 7919 Folsom Boulevard, Suite 300 Sacramento, CA 95826 Phone: (916) 383-2500 Email: [email protected] Contact: Angelo Christie

Agent/Delineator: HELIX Environmental Planning, Inc. 11 Natoma Street, Suite 150 Folsom, CA 95630 Phone: (916) 365-8700 Email: [email protected] Contact: Patrick Martin

mailto:[email protected]


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1.4 REGULATORY SETTING

1.4.1 Waters of the U.S.

Any person, firm, or agency planning to alter or work in “waters of the U.S.,” including the discharge of dredged or fill material, must first obtain authorization from the USACE under Section 404 of the Clean Water Act (CWA; 33 USC 1344). Permits, licenses, variances, or similar authorization may also be required by other federal, state, and local statutes. Section 10 of the Rivers and Harbors Act prohibits the obstruction or alteration of navigable waters of the U.S. without a permit from USACE (33 USC 403).

On April 21, 2020, the Environmental Protection Agency (EPA) and USACE published the Navigable Waters Protection Rule to define “Waters of the United States” in the Federal Register. On June 22, 2020 the Navigable Waters Protection Rule: Definition of “Waters of the United States” (NWPR) became effective in 49 states, including California, and in all US territories.

The NWPR regulates traditional navigable waters and perennial or intermittent tributary systems, and defines four categories of regulated waters including:

• The territorial seas and traditional navigable waters; • Perennial and intermittent tributaries to those waters; • Certain lakes, ponds, and impoundments; and • Wetlands adjacent to jurisdictional waters.

The NWPR also defines 12 categories of exempted aquatic resources:

• Waters not listed as waters of the U.S. • Groundwater • Ephemeral features • Diffuse stormwater run-off • Ditches not identified as waters of the U.S. • Prior converted cropland (PCC) • Artificially irrigated areas • Artificial lakes and ponds • Water-filled depressions incidental to mining or construction activity • Stormwater control features • Groundwater recharge, water reuse, and wastewater recycling structures • Waste treatment systems

With non-tidal waters, in the absence of adjacent wetlands, the extent of USACE jurisdiction extends to the ordinary high water mark (OHWM) – the line on the shore established by fluctuations of water and indicated by a clear, natural line impressed on the bank, shelving, changes in soil character, destruction of terrestrial vegetation, or the presence of litter and debris. Wetlands are defined in 33 CFR Part 328 as:

“those areas that are inundated or saturated by surface or ground water at a frequency and duration to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions.”


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Federal and state regulations pertaining to waters of the U.S., including wetlands, are discussed below.

Clean Water Act (33 USC 1251-1376). The CWA provides guidance for the restoration and maintenance of the chemical, physical, and biological integrity of the nation’s waters.

Section 401 requires that an applicant for a federal license or permit that allows activities resulting in a discharge to waters of the U.S. must obtain a state certification that the discharge complies with other provisions of CWA. The Regional Water Quality Control Board (RWQCB) administers the certification program in California and may require State Water Quality Certification before other permits are issued.

Section 402 establishes a permitting system for the discharge of any pollutant (except dredged or fill material) into waters of the U.S.

Section 404 establishes a permit program administered by USACE that regulates the discharge of dredged or fill material into waters of the U.S. (including wetlands). Implementing regulations by USACE are found at 33 CFR Parts 320-332. The Section 404 (b)(1) Guidelines were developed by the USEPA in conjunction with USACE (40 CFR Part 230), allowing the discharge of dredged or fill material for non-water dependent uses into special aquatic sites only if there is no practicable alternative that would have less adverse impacts.

1.4.2 Waters of the State

Any action requiring a CWA Section 404 permit, or a Rivers and Harbors Act Section 10 permit, must also obtain a CWA Section 401 Water Quality Certification. The State of California Water Quality Certification (WQC) Program was formally initiated by the State Water Resources Control Board (SWRCB) in 1990 under the requirements stipulated by Section 401 of the Federal Clean Water Act. Although the Clean Water Act is a Federal law, Section 401 of the CWA recognizes that states have the primary authority and responsibility for setting water quality standards. In California, under Section 401, the State and Regional Water Boards are the authorities that certify that issuance of a federal license or permit does not violate California’s water quality standards (i.e., that they do not violate Porter-Cologne and the Water Code). The WQC Program currently issues the WQC for discharges requiring USACE permits for fill and dredge discharges within Waters of the United States, and now also implements the State's wetland protection and hydromodification regulation program under the Porter Cologne Water Quality Control Act.

On May 28, 2020, the SWRCB implemented the State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State (Procedures) for inclusion in the forthcoming Water Quality Control Plan for Inland Surface Waters and Enclosed Bays and Estuaries and Ocean Waters of California (SWRCB 2019). The Procedures consist of four major elements:

I. A wetland definition; II. A framework for determining if a feature that meets the wetland definition is a water of the

state; III. Wetland delineation procedures; and IV. Procedures for the submittal, review and approval of applications for Water Quality

Certifications and Waste Discharge Requirements for dredge or fill activities.


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Under the Procedures and the State Water Code (Water Code §13050(e)), “Waters of the State” are defined as “any surface water or groundwater, including saline waters, within the boundaries of the state.” “Waters of the State” includes all “Waters of the U.S.”

More specifically, a wetland is defined as: “An area is wetland if, under normal circumstances, (1) the area has continuous or recurrent saturation of the upper substrate caused by groundwater, or shallow surface water, or both; (2) the duration of such saturation is sufficient to cause anaerobic conditions in the upper substrate; and (3) the area’s vegetation is dominated by hydrophytes or the area lacks vegetation.” The wetland definition encompasses the full range of wetland types commonly recognized in California, including some features not protected under federal law, and reflects current scientific understanding of the formation and functioning of wetlands (SWRCB 2019).

Unless excluded by the Procedures, any activity that could result in discharge of dredged or fill material to Waters of the State, which includes Waters of the U.S. and non-federal Waters of the State, requires filing of an application under the Procedures.

2.0 ENVIRONMENTAL SETTING 2.1 LOCATION DESCRIPTION

The ±36-acre Study Area is located in El Dorado County north of U.S. Highway 50. It is bifurcated by Silva Valley Parkway and bordered on the west by Clarksville Crossing and on the southeast by Tong Road. The Study Area is located within Township 9 North, Range 8 East, Section 1 of the Clarksville USGS 7.5-minute series quadrangle. The approximate center of the Study Area is latitude 38.662023° and longitude -121.055946° (Appendix A, Figure 1). The elevation on the site is approximately 705 to 795 feet above msl. Appendix A, Figure 3 is an aerial photograph of the project site and vicinity. Surface runoff flows through and exits the Study Area via ephemeral and intermittent drainages, which flow in a northeast to southwest direction. Slopes range from less than one percent to 30 percent.

2.2 EXISTING CONDITIONS

The Study Area is split into a northern portion and a southern portion, which are bisected by Silva Valley Parkway that runs in a general northwest to southeast direction. Land uses surrounding the Study Area include residential development and an elementary school to the north and paved roads and undeveloped land to the east, west, and south.

2.3 FIELD CONDITIONS

Fieldwork for the aquatic resource delineation was conducted on October 13, 2020 and the weather during the site visit was sunny and warm. The climate of El Dorado Hills is Mediterranean, characterized by wet, cool winters and dry, hot summers. The nearest weather station is the Sacramento Executive Airport weather station in Sacramento, California, located approximately 26 miles west of the project site. Average daily maximum and minimum temperatures are 92° and 59° Fahrenheit (F) in July and 56° and 39° F in January (NRCS 2020a). The mean annual precipitation is 17.8 inches, with 100 percent occurring as rain from September through May. The weather station received approximately 6.14 inches of rainfall this rain season starting in October (NRCS 2020a). In the previous year, the weather station received 24.6 inches, which is 138% of normal (NRCS 2020a).


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2.4 INTERSTATE OR FOREIGN COMMERCE CONNECTION

The Study Area is located in the Upper Cosumnes watershed (USGS Hydrologic Unit Code (HUC8) 18040013). The Study Area is upslope of an unnamed tributary to Carson Creek, which is tributary to Deer Creek and the Cosumnes River. The Cosumnes River is tributary to the Mokelumne River, a traditional navigable water used in interstate and foreign commerce.

3.0 METHODS 3.1 DATA GATHERING

The following sources were used in preparation of this jurisdictional delineation:

• Aerial photography taken November 7, 2019 downloaded from Esri®,

• U.S. Fish and Wildlife Service’s (USFWS) National Wetland Inventory online wetland mapper (USFWS 2020),

• Natural Resources Conservation Service (NRCS) web soil survey (NRCS 2020b),

• Corps of Engineers Wetlands Delineation Manual (Environmental Laboratory 1987),

• Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0) (USACE 2008),

• Field Indicators of Hydric Soils in the United States (Version 8.2) (NRCS 2018),

• A Field Guide to the Identification of the OHWM in the Arid West Region of the Western United States (Lichvar and McColley 2008), and

• USACE 2018 National Wetland Plant List for the Arid West (USACE 2018).

3.2 BOUNDARIES OF THE DELINEATION

The delineation area includes the entire 36-acre Study Area. Refer to the delineation map in Appendix B for the limits of the delineation.

3.3 DETERMINATION PROCEDURES

3.3.1 Delineation Methods

Fieldwork for the jurisdictional delineation was conducted by HELIX biologist Patrick Martin and Halie Goeman in accordance with the Corps of Engineers Wetlands Delineation Manual (Environmental Laboratory 1987), the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0) (USACE 2008), and the Corps of Engineers A Field Guide to the Identification of the Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United States (Field Guide) (Lichvar and McColley 2008). Vegetation, soils, and hydrologic characteristics were visually


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assessed by walking meandering transects through the entire project site to obtain 100 percent visual coverage. The plant species identifiable at the time of the survey were recorded (refer to Appendix C for the list of plants observed with the wetland indicator status for each species). Representative photographs are included as Appendix D.

The three-parameter method was used to determine the presence/absence of wetlands, which involves identifying indicators of hydrophytic vegetation, hydric soils, and wetland hydrology according to the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0) (USACE 2008) and the Arid West 2018Regional Wetland Plant List (USACE 2018). In the field, a Munsell Color (Gregtag Macbeth 2000) chart was used to determine moist soil colors. A total of three additional data points were taken throughout the Study Area in 2020 to classify the site’s soils, vegetation, and hydrologic characteristics and the accompanying data forms are included in Appendix E. The extent of wetlands and other waters within the Study Area were mapped in the field with a tablet wirelessly connected to an Arrow GPS unit with sub-meter accuracy. These data were exported into ArcMap 10.7.1® and used to produce the map of aquatic features in the delineation area and calculate the acreage of each aquatic feature.

3.3.2 Determination of Potential Jurisdiction

Waters of the U.S.

Under the NWPR, the USACE and EPA regulate traditional navigable waters and perennial or intermittent tributary systems. The four categories of regulated waters include:

I. The territorial seas and traditional navigable waters; II. Perennial and intermittent tributaries to those waters;

III. Certain lakes, ponds, and impoundments; and IV. Wetlands adjacent to jurisdictional waters.

The NWPR excludes from the definition of ‘‘waters of the United States’’ all waters or features not mentioned above. In addition to this general exclusion, the NWPR clarifies that waters of the U.S. do not include the following:

• Groundwater, including groundwater drained through subsurface drainage systems;

• Ephemeral features that flow only in direct response to precipitation, including ephemeral streams, swales, gullies, rills, and pools;

• Diffuse stormwater runoff and directional sheet flow over upland;

• Ditches that are not traditional navigable waters, tributaries, or that are not constructed in adjacent wetlands, subject to certain limitations;

• Prior converted cropland;

• Artificially irrigated areas that would revert to upland if artificial irrigation ceases;

• Artificial lakes and ponds that are not jurisdictional impoundments and that are constructed or excavated in upland or non-jurisdictional waters;


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• Water-filled depressions constructed or excavated in upland or in non-jurisdictional waters incidental to mining or construction activity, and pits excavated in upland or in non-jurisdictional waters for the purpose of obtaining fill, sand, or gravel;

• Stormwater control features constructed or excavated in upland or in non-jurisdictional waters to convey, treat, infiltrate, or store stormwater runoff;

• Groundwater recharge, water reuse, and wastewater recycling structures constructed or excavated in upland or in non-jurisdictional waters; and

• Waste treatment systems.

Waters of the State

The RWQCB will assert jurisdiction over any waters of the State, including wetlands, regardless of whether or not the feature qualifies as waters of the U.S. Under the Procedures and the State Water Code (Water Code §13050(e)), “Waters of the State” are defined as “any surface water or groundwater, including saline waters, within the boundaries of the state.” “Waters of the State” includes all “Waters of the U.S.” The following wetlands are waters of the State:

1. Natural wetlands,

2. Wetlands created by modification of a surface water of the state,

3. Artificial wetlands that meet any of the following criteria:

a. Approved by an agency as compensatory mitigation for impacts to other Waters of the State, except where the approving agency explicitly identifies the mitigation as being of limited duration;

b. Specifically identified in a water quality control plan as a wetland or other water of the state;

c. Resulted from historic human activity, is not subject to ongoing operation and maintenance, and has become a relatively permanent part of the natural landscape; or

d. Greater than or equal to one acre in size, unless the artificial wetland was constructed, and is currently used and maintained, primarily for one or more of the following purposes (i.e., the following artificial wetlands are not Waters of the State unless they also satisfy the criteria set forth in 2, 3a, or 3b):

i. Industrial or municipal wastewater treatment or disposal, ii. Settling of sediment,

iii. Detention, retention, infiltration, or treatment of stormwater runoff and other pollutants or runoff subject to regulation under a municipal, construction, or industrial 58 stormwater permitting program,

iv. Treatment of surface waters, v. Agricultural crop irrigation or stock watering,

vi. Fire suppression, vii. Industrial processing or cooling,

viii. Active surface mining – even if the site is managed for interim wetlands functions and values,


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ix. Log storage, x. Treatment, storage, or distribution of recycled water,

xi. Maximizing groundwater recharge (this does not include wetlands that have incidental groundwater recharge benefits), or

xii. Fields flooded for rice growing.

All artificial wetlands that are less than an acre in size and do not satisfy the criteria set forth in 2, 3.a, 3.b, or 3.c are not Waters of the State.

3.3.3 Plant/Habitat Nomenclature

Habitat nomenclature is generally derived from A Guide to Wildlife Habitats of California (Mayer and Laudenslayer 1988). Plant nomenclature is taken from The Jepson Manual: Vascular Plants of California, second edition (Baldwin et al. 2012).

4.0 RESULTS 4.1 VEGETATION COMMUNITIES/HABITAT TYPES

Terrestrial biological habitats and land covers present within the Study Area include non-native annual grassland, riparian woodland, valley oak woodland, and disturbed/developed, which are described in detail below. Aquatic resources are described in Section 5.0.

4.1.1 Non-Native Annual Grassland

Non-native annual grassland dominates the northern and southern portions of the Study Area. This vegetation community is characterized primarily by an assemblage of non-native annual grasses and forbs. Dominant vegetation includes ripgut brome (Bromus diandrus), soft chess (Bromus hordeaceus), and wild oat (Avena fatua) intermixed with red-stemmed filaree (Erodium cicutarium), popcornflower (Plagiobothrys sp.), black mustard (Brassica nigra), winter vetch (Vicia villosa), scarlet pimpernel (Anagallis arvensis), St. John’s wort (Hypericum perforatum), brodiaea (Brodiaea elegans), fiddleneck (Amsinckia sp.), rose clover (Trifolium hirtum), and milk-thistle (Silybum marianum). Isolated valley oak (Quercus lobata) trees also occur in the non-native annual grassland.

4.1.2 Riparian Woodland

Riparian habitat occurs along the riverine perennial marsh and perennial drainage in the northern drainage system. Dominant vegetation includes broadleaf cattail (Typha latifolia), willow (Salix sp.), spike rush (Eleocharis macrostachya), pennyroyal (Mentha pulegium), Himalayan blackberry (Rubus armeniacus), Fremont cottonwood (Populus fremontii), and isolated valley oak trees.

4.1.3 Valley Oak Woodland

Valley oak woodland is found in a small area on the southwest boundary of the Study Area where a small stand of mature valley oak trees overhangs a small perennial drainage. The understory is primarily annual grassland with small areas of milkweed (Asclepias fascicularis) and pennyroyal immediately adjacent to the drainage.


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4.1.4 Disturbed/Developed

Disturbed/developed areas occur throughout the Study Area. Disturbed/developed areas include graded roads and a stockpile area. The ruderal/disturbed areas are sparsely vegetated with red-stemmed filaree, soft chess, wild oat, and winter vetch.

4.2 CLIMATE

The climate of El Dorado County is Mediterranean, characterized by wet, cool winters and dry, hot summers. The nearest weather station with complete climate data is the Sacramento Executive Airport weather station in Sacramento, California, located approximately 26 miles west of the project site. Average daily maximum and minimum temperatures are 92° and 59° Fahrenheit (F) in July and 56° and 39° F in January (NRCS 2020a). The mean annual precipitation is 17.8 inches, with 100 percent occurring as rain from September through May. The weather station received approximately 6.14 inches of rainfall this rain season starting in October (NRCS 2020a). In the previous year, the weather station received 24.6 inches, which is 138% of normal (NRCS 2020a).

4.3 SOILS

The Natural Resources Conservation Service (NRCS) has mapped one soil unit within the Study Area (Appendix A, Figure 4). Auburn Silt Loam, 2 to 30 Percent Slopes. General characteristics associated with this soil type are described below (USDA, NRCS 2020b).

Auburn Silt Loam, 2 to 30 Percent Slopes (AwD): The soils in this series are well drained. Permeability is moderate. Vegetation associated with this soil series includes annual grasses, forbs, and oaks. The hydric soils list for El Dorado County does not identify this soil as hydric (USDA, NRCS 2020c).

4.4 HYDROLOGY

The Study Area is located in the Upper Cosumnes River watershed (HUC8 18040013). The hydrologic regime on the Study Area is predominantly year-round irrigation runoff from the adjacent development to the north, seasonal stormwater runoff, and direct precipitation, which primarily falls between November and March. Annual average precipitation is approximately 15 to 20 inches. Surface water runoff runs in a general northeast to southwest direction.

4.5 USFWS NATIONAL WETLANDS INVENTORY

The USFWS National Wetlands Inventory online database was reviewed to determine if there are any wetlands or other waters of the U.S. mapped by the USFWS in the Study Area or vicinity. The National Wetlands Inventory does not identify any wetlands or other waters of the U.S. in the Study Area. Off-site and to the west and east, the NWI identifies an unnamed tributary to Carson Creek (Appendix A, Figure 5).

5.0 AQUATIC RESOURCES A total of 0.740 acre of aquatic resources and other waters of the U.S. were mapped within the Study Area. This acreage consists of 0.133 acre of seasonal wetlands, 0.007 acre of seep, 0.006 acre of wetland


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swale, 0.234 acre of ephemeral drainage, and 0.360 acre of intermittent drainage (Appendix B). This acreage includes 0.19 acre of waters of the U.S. that was previously verified by the USACE within a 17.9-acre portion of the northern portion of the Study Area (SPK-2013-00090). This previously verified acreage was carried forward in this delineation. A description of all of the features delineated within the Study Area are provided in the following sections.

5.1.1 Seasonal Wetland

A total of 0.133 acre of seasonal wetlands has been delineated within the Study Area (Appendix B). Seasonal wetlands are often depressions or topographic folds within the landscape that inundate for short periods of time following intense rains, but do not maintain seasonal aquatic or saturated soil conditions for durations long enough for colonization by perennial, obligate plant species. As such, plant species in seasonal wetlands are generally of two types: species that can tolerate short periods of inundation but have not adapted to withstand sustained aquatic or saturated soil conditions, and short-lived (primarily annual) species that take advantage of ephemeral aquatic and/or saturated soil conditions. Many of the seasonal wetlands within the Study Area are adjacent to the ephemeral drainage on the northern portion of the Study Area. There are also two depressional seasonal wetlands on the Study Area appear to have formed as a result of historic excavation as they are located next to large, steep mounds. Dominant vegetation includes rabbitsfoot grass (Polypogon monspeliensis), spike rush, and nutsedge (Cyperus eragrostis).

5.1.2 Seep

A total of 0.007 acre of seep has been delineated within the Study Area (Appendix B). Seeps are characterized as areas where subsurface flows intersects the soil surface. Typically, water flows from seeps persist for some period after the rainy season or, more rarely, nearly year-round. Seeps accessing sufficient amounts of subsurface water can support isolated wetland vegetation (such as on a hillside) or they may form the headwaters of other jurisdictional drainage or wetland features, such as wetland swales. Vegetation in seeps often consists of plant species associated with seasonal and semi-permanent marsh habitats. When seeps are active for only short periods beyond the rainy season and into the warm season, herbaceous perennial wetland species typically dominate, as is typical of the seeps within the Study Area. Vegetation in the seep include consisted almost entirely of iris leaved rush (Juncus xiphioides) (OBL). Hydric soil indicators in the seep included a redox dark surface with distinct or prominent redoximorphic features located along root channels of living roots and as concentrations in the matrix. Wetland hydrology requirements were met by oxidized rhizospheres, saturation visible on aerial imagery and the FAC-neutral test.

5.1.3 Wetland Swale

A total of 0.006 acre of wetland swale was delineated on the Study Area (Appendix B). The wetland swale within the Study Area is associated with SW-3 on the northern portion of the Study Area and conveys water from that feature to ED-16 during high flow events. Dominant vegetation occurring within the wetland swale includes curly dock (Rumex crispus), pennyroyal, coyote-thistle (Eryngium vaseyi), brome fescue (Festuca bromoides), rye grass, annual hair grass (Deschampsia danthonioides), and rabbitsfoot grass.


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5.1.4 Ephemeral Drainage

A total of 0.234 acre of ephemeral drainages have been delineated within the Study Area (Appendix B). Ephemeral drainages are not wetlands as they do not meet the three-parameter criteria for vegetation, hydrology, and soils but do convey water and exhibit an ordinary high water mark. Water flows within ephemeral drainages are fed primarily by precipitation and surface water runoff. These features convey water during and immediately after storm events, but do not flow continuously throughout the winter and spring. Typically, these features exhibit a defined bed and bank and show signs of scouring as a result of rapid flow events. Although the channels of the ephemeral drainages within the Study Area are largely unvegetated, what vegetation is present includes winter vetch, ripgut brome, ryegrass, phacelia (Phacelia cicutaria), and medusahead (Elymus caput-medusae).

5.1.5 Intermittent Drainage

A total of 0.360 acre of intermittent drainage (ID-18) has been delineated within the Study Area (Appendix B). Intermittent drainages receive substantial seasonal flows of significant velocity and may appear as perennial features during the normal wet season. These seasonal flows often scour the channel of vegetation. Intermittent drainages may support fringe wetland vegetation types, such as seasonal or semi-permanent marsh or riparian wetlands. Conversely, intermittent drainages may be associated with hydrophytic vegetation communities that lack further wetland indicators. A typical hydroperiod of intermittent drainages is one that begins with the onset of substantial rains in the normal wet season and persists for an extended, variable amount of time into summer.

A brick check dam has been constructed across a portion of the feature near datapoint 4a (Appendix B). This check dam has resulted in periods of water backing up during flow events that have supported the establishment of hydrophytic emergent vegetation upstream of datapoint 4a. The area containing emergent vegetation is dominated by common knotweed (Persicaria lapathifolia) and curly dock with areas of dense cattails and Himalayan blackberry and a small clump of willows. This area is entirely within the ordinary high water mark of the intermittent drainage.

Table 1 below provides a summary of aquatic resources mapped within the Study Area.


12

Table 1 AQUATIC RESOURCES IN THE STUDY AREA

Feature Lat./Long. Cowardin Classification1

Area (ac.)

Area (sq. ft.)

Length (ft.)

Avg. Width (ft.)

Wetlands SW-1 38.66254651 / -121.0564125 PEM2 0.008 348.48 -- -- SW-2 38.66215585 / -121.0582332 PEM2 0.007 304.92 -- -- SW-3 38.662031 / -121.056976 PEM2 0.075 3267.00 -- -- SW-4 38.66253163/ -121.0568429 PEM2 0.003 130.68 -- -- SW-5 38.66247183/ -121.0568167 PEM2 0.005 217.80 -- -- SW-6 38.66235351/ -121.0567944 PEM2 0.010 435.60 -- -- SW-7 38.6621443/ -121.0568692 PEM2 0.006 261.36 -- -- SW-8 38.66207073/ -121.0567484 PEM2 0.004 174.24 -- -- SW-9 38.66196011/ -121.0567973 PEM2 0.003 130.68 -- -- SW-10 38.66196011/ -121.0567973 PEM2 0.004 174.24 -- -- SW-11 38.66189125/ -121.0569108 PEM2 0.002 87.12 -- -- SW-12 38.66012735/ -121.0573589 PEM2 0.007 304.92 -- -- SP-13 38.660456/ -121.057044 PEM1 0.007 304.92 -- -- WS-13 38.661785/ -121.057015 PEM2 0.006 261.36 88 --

Wetlands Total 0.147 6,403.32 88 -- Other Waters ED-15 38.661593/ -121.058623 R4SB 0.028 1219.68 73 -- ED-16 38.66240343/ -121.0567807 R4SB 0.036 1568.16 724 -- ED-17 38.66209325/ -121.0564943 R4SB 0.018 784.08 398 -- ED-18 38.662473/ -121.058284 R4SB 0.151 6577.56 333 -- ID-19 38.660444/ -121.05731 R4SB 0.360 15681.6 982 --

Other Waters Total 0.593 25,831.08 2510 -- Total Aquatic Resources 0.740 31,874.40 2,598 --

1 Cowardin Codes for Wetlands: System (P = Palustrine; R = Riverine) Subsystem (4 = Intermittent) – Class (EM = Emergent; SB = Streambed) – Subclass (1 = Persistent; 2 = Non-persistent; 7 = Vegetated) – Modifiers (E = Seasonally Flooded/Saturated; K = Artificial; f = Farmed; x = Excavated).

5.2 POTENTIAL WATERS OF THE U.S.

Ephemeral drainages are currently not considered to be jurisdictional features under the 2020 Navigable Waters Protection Rule (see Section 1.4.1). Therefore, the 0.234 acre of ephemeral drainages within the Study Area would not be expected to be considered waters of the U.S. Seasonal wetland 1 and seasonal wetland 2 (total of 0.015 acre) may also not be considered waters of the U.S. as they appear to have formed from historic excavations and are therefore a product of upland excavations and likely isolated from the remaining of the aquatic features on the site. The seep (0.007 acre) may also not be considered a water to the U.S. since it is not adjacent to the intermittent drainage feature and otherwise appears to be hydrologically isolated. The remaining 0.484 acres of aquatic resources within the Study Area would be expected to be considered waters of the U.S. subject to verification by the USACE.

5.3 POTENTIAL WATERS OF THE STATE

All aquatic resources in the Study Area (0.740 acre) are expected to be considered waters of the State subject to verification by the CVRWQCB under current regulatory guidance (see Section 1.4.2).


13

6.0 SUMMARY HELIX conducted an aquatic resources delineation of the 36-acre Study Area in El Dorado Hills in El Dorado County. A total of 0.740 acre of aquatic resources was mapped within the Study Area. This acreage is comprised of 0.133 acre of seasonal wetland, 0.007 acre of seep, 0.006 acre of wetland swale, 0.234 acre of ephemeral drainage, and 0.360 acre of intermittent drainage. This aquatic resource delineation is preliminary and subject to verification by the resource agencies.


14

7.0 REFERENCES Baldwin, B.G., D.H. Goldman, D.J. Keil, R. Patterson, T.J. Rosatti, D.H. Wilken, editors. 2012. The Jepson

Manual: Vascular Plants of California, second edition. University of California Press, Berkeley.

Environmental Laboratory. 1987. Wetlands Research Program Technical Report Y-87-1 Corps of Engineers Wetland Delineation Manual. January 1987

Gregtag Macbeth. 2000. Munsell Soil Color Charts. New Windsor, NY.

Lichvar, Robert W. and Shawn McColley. 2008. A Field Guide to the Identification of the Ordinary High-Water Mark (OHWM) in the Arid West Region of the Western United States. Vicksburg, MS: U.S. Army Corps of Engineers Research and Development Center.

Mayer, K.E. and W.F. Laudenslayer. 1988. A Guide to Wildlife Habitats of California. State of California, Resources Agency, Department of Fish and Game, Sacramento, CA 166pp.

Soil Survey Staff, Natural Resources Conservation Service, United States Department of Agriculture (NRCS). 2018. Field Indicators of Hydric Soils in the United States, Version 8.2. L.M. Vasilas, G.W. Hurt, and J.F. Berkowitz (eds.). USDA, NRCS, in cooperation with the National Technical Committee for Hydric Soils.

2020a. Climate Data and Summary Reports from AgACIS. Accessed online September 2, 2020 at: http://agacis.rcc-acis.org/?fips= 06067.

2020b. Web Soil Survey. Available online at: http://websoilsurvey.nrcs.usda.gov/. Accessed October 13, 2020.

2020c. National List of Hydric Soils. Available online at: https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcseprd1316620.html https://www.nrcs.usda.gov/wps/portal/nrcs/main/soils/use/hydric/. Accessed October 13, 2020.

State Water Resources Control Board (SWRCB). 2019. State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State. Available online at: https://www.waterboards.ca.gov/water_issues/programs/cwa401/docs/procedures_conformed.pdf.

U.S. Army Corps of Engineers (USACE). 2018. Arid West 2018 Regional Wetland Plant List.

2016. Minimum Standards for Acceptance of Aquatic Resource Delineation Reports (Sacramento District).

2008. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0). J.S. Wakeley, R.W. Lichvar, and C.V. Noble, eds., Technical Report prepared for the U.S. Army Engineer Research and Development Center, Vicksburg, MS.

http://agacis.rcc-acis.org/?fips=%2006067


15

U.S. Fish and Wildlife Service (USFWS). 2020. National Wetlands Inventory. Accessed online October 13, 2020 at: < http://www.fws.gov/wetlands/Data/mapper.html>.


16


Appendix AFigures


£¤50

EL DORADOCOUNTY

SACRAMENTO COUNTY

BassLake

Folsom Lake

Folsom

Cameron Park

El DoradoHills

Figure 1Site and Vicinity Map

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K

El Dorado Hills 52 Property

0 1 Miles

EL DORADO

AMADOR

BUTTE

CALAVERAS

NEVADA

PLACER

SACRAMENTO

SAN JOAQUIN

SOLANO

SUTTER

TUOLUMNE

YOLO

YUBA

STUDY AREA

STUDY AREA

USGS 7.5 Min. Clarksville QuadTownship 9N, Range 8E, Section 1Approximate Location:38.662023 -121.055946 Coordinate System/Datum:NAD 83 CORS96 State Plane CA Zone IIApproximate acreage: ± 36.0 acres

Silva Val ley Pkwy

White Rock Rd

Green Valley Rd

El Dorado Hil ls Blvd

Latrobe Rd

Broadstone Pkw y

Figure 2Topographic Map

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Source: USGS National Map, 2020

K


0 2,000 Feet

Longitude/ Latitude: 38.662023 -121.055946

USGS Base Map: Clarksville 7.5 Minute QuadMount Diablo Meridian Township 9N, Range 8E, Section 1

Study Area

Silva Valley Parkway

Clarksville CrossingTon g Road

I½

Figure 3Aerial Map

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11.mx

d 11/1

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K


0 250 Feet

Study AreaStudy Area


Clarksville CrossingTon g Road

I½

Figure 4Soils Map

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mxd 1

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Source:NRCS, 2020; Aerial (DigitalGlobe, 11/07/2019)

K


0 250 Feet

Soil Types

AwD, Auburn Silt Loam, 2-30% Slopes



ClarksvilleCrossing

Tong Road

I½

Figure 5National Wetland Inventory Map

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Source: NWI, 2020; Aerial (DigitalGlobe, 11/7/2019)

K


0 500 Feet

Legend

Study Area - 36.0 AcresFreshwater Emergent WetlandRiverine


Appendix BAquatic Resources Delineation Map


Photo#21 SW-9

38.659372°, 121.05509748°

38.6632586° 121.05715729°

SW-1SW-4SW-5

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Silva Valley ParkwayClarksville Crossing Tong Road

Drawn By: JCD

Appendix B±0 150 300

Feet

1 inch = 150 feet

AQUATIC RESOURCES DELINEATION MAP

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El Dorado Hills 52El Dorado Hills, El Dorado County, California

November 10, 2020DESCRIPTIONDATE BY

REVISIONS

USACE REGULATORY FILE #: VERIFIED BY: TBDDATE OF VERIFICATION: TBD

OTHER FEATURES!A Coordinate Point

S Culvert

!< Upland Data Point

! Wetland Data Point

#0 Well

Label Acres Latitude LongitudeSW-1 0.008 38.66254651 -121.0564125SW-2 0.007 38.66215585 -121.0582332SW-3 0.075 38.662031 -121.056976SW-4 0.003 38.66253163 -121.0568429SW-5 0.005 38.66247183 -121.0568167SW-6 0.010 38.66235351 -121.0567944SW-7 0.006 38.6621443 -121.0568692SW-8 0.004 38.66207073 -121.0567484SW-9 0.003 38.66207073 -121.0567484

SW-10 0.004 38.66196011 -121.0567973SW-11 0.002 38.66189125 -121.0569108SW-12 0.007 38.66012735 -121.0573589

Subtotal: 0.133

Label Acres Latitude LongitudeSP-13 0.007 38.660456 -121.057044

Subtotal: 0.007

Label Acres Length (Ft) Latitude LongitudeWS-14 0.006 88 38.661785 -121.057015

Subtotal: 0.006 88

Label Acres Length (Ft) Latitude LongitudeED-15 0.028 73 38.661593 -121.058623ED-16 0.036 724 38.66240343 -121.0567807ED-17 0.018 398 38.66209325 -121.0564943ED-18 0.151 333 38.662473 -121.058284

Subtotal: 0.234 1,528

Label Acres Length (Ft) Latitude LongitudeID-19 0.360 982 38.660444 -121.05731

Subtotal: 0.360 982

Acres Length (Ft)TOTALS: 0.740 2,598

Seep

Ephemeral Drainage

Intermittent Drainage

AQUATIC RESOURCES INDIVIDUAL FEATURE TABLE

Seasonal Wetland

Wetland Swale

• Th e b ou ndaries and ju risdictional statu s of all waters sh own on th is map are prelim inary and su b jec t to verification by th e U.S. Arm y Corps of Engineers.• Approxim ately 17.9 acres of north ern portion of Stu dy Area was previou sly verified by USACE on Au g u st 19, 2019 (SPK-2013-00090)• North ern portion originally delineated By: Kelly Bayne of Footh ills Associates, Decem ber 15, 2015.• Delineation u pdated By P. Martin on October 13, 2020.• Aqu atic resou rces were mapped by HELIX u sing an EOS Arrow Global Positioning System• Th is delineation u tilizes th e Corps’ 1987 th ree-parameter meth odology and Arid West Su pplem ent to delineate ju risdictional waters of th e U.S.• Th e Hydrologic Unit Code for th is site is 18040013• Topog raph ic c ontou r interval is 5 feet.• Digital base data provided by R SC Engineering• Coordinate System: NAD 83 UTM Zone 10N• Projec tion: Transverse Mercator• Datu m : North American Datu m 1983

NOTES

Appendix CList of Plants Observed in the

Study Area


El Dorado Hills 52

Appendix C

List of Plants Observed within the Study Area

C-1

Family Scientific Name Common Name Indicator Status*

Fabaceae Acmispom americanus var. americanus American bird’s foot trefoil UPL

Poaceae Aegilops cylindrica Jointed goat grass --

Poaceae Avena fatua Wildoats --

Asteraceae Baccharis pilularis ssp. Consanguinea Coyote brush --

Poaceae Briza minor Little rattlesnake grass FAC

Themidaceae Brodiaea elegans Harvest brodiaea FACU

Poaceae Bromus diandrus Ripgut brome --

Poaceae Bromus hordeaceus Soft brome FACU

Asteraceae Carduus pycnocephalus Italian thistle --

Asteraceae Centromadia fitchii Spikeweed FACU

Agavaceae Chlorogalum pomeridianum var. pomeridianum

Common soaproot --

Asteraceae Cirsium vulgare Bull thistle FACU

Euphorbiaceae Croton setiger Turkey mullein --

Convolvulaceae Cuscuta californica California dodder --

Poaceae Cynodon dactylon Bermuda grass FACU

Cyperaceae Cyperus eragrostis Tall cyperus FACW

Apiaceae Daucus pusillus Wild carrot UPL

Poaceae Deschampsia danthonioides Annual hair grass FACW

Poaceae Deschampsia elongata Slender hair grass FACW

Themidaceae Dichelostemma capitatum ssp. Capitatum

Wild hyacinth FACU

Asteraceae Dittrichia graveolens Stinkwort --

Campanulaceae Downingia spp. Downingia OBL

Cyperaceae Eleocharis acicularis Needle spikerush OBL

Cyperaceae Eleocharis macrostachya Pale spikerush OBL

Poaceae Elymus caput-medusae Medusahead --

Onagraceae Epilobium brachycarpum annual willowherb FAC

Onagraceae Epilobium cf. ciliatum Fringed willowherb FACW

Onagraceae Epilobium densifolrum Denseflower willowherb FACW

Geraniaceae Erodium botrys Big heron bill FACU

Geraniaceae Erodium cicutarium Coastal heron’s bill --

Apiaceae Eryngium castrense Great Valley button-celery OBL

Phrymaceae Erythranthe guttata (Mimulus guttatus) Yellow monkey flower OBL

Poaceae Festuca microstachys Small fescue --

Poaceae Festuca myuros Rattail sixweeks grass FACU

Poaceae Festuca perennis Italian rye grass FAC

Rhamnaceae Frangula californica ssp. Tomentella Hoary coffeeberry --

Poaceae Gastridium phleoides Nit grass FACU

Geraniaceae Geranium dissectum Cutleaf geranium --

Geraniaceae Geranium molle Crane’s bill geranium --

Poaceae Glyceria declinata Low manna grass FACW

Asteraceae Holocarpha virgata ssp. virgata Narrow tarplant --

Poaceae Hordeum marinum Barley FAC

Hypericaceae Hypericum perforatum ssp. Perforatum Klamathweed FACU

Asteraceae Hypochaeris glabra Smooth cat’s-ear --

Juncaceae Juncus bufonius Toad rush FACW

Juncaceae Juncus capitatus Leafy bracted dwarf rush FACU

El Dorado Hills 52

Appendix C (cont.)

List of Plants Observed within the Study Area

C-2

Family Scientific Name Common Name Indicator Status*

Juncaceae Juncus cf. mexicanus Mexican rush FACW

Juncaceae Juncus cf. tenuis Slender rush FACW

Juncaceae Juncus xiphioides Iris leaved rush OBL

Asteraceae Lactuca serriola Prickly lettuce FACU

Asteraceae Lasthenia fremontii Vernal pool goldfields OBL

Asteraceae Leontodon saxatilis Hairy hawkbit FACU

Linaceae Linum usitatissimum Common flax --

Lythraceae Lythrum hyssopifolia Hyssop loosestrife OBL

Lamiaceae Mentha pulegium Pennyroyal OBL

Poaceae Muhlenbergia rigens Deer grass FAC

Polemoniaceae Navarretia intertexta Interwoven navarretia FACW

Poaceae Paspalum dilatatum Dallis grass FAC

Polygonaceae Persicaria sp. Smartweed OBL

Boraginaceae Plagiobothrys stipitatus Stalked popcorn-flower FACW

Poaceae Pleuropogon californicus Semaphore grass OBL

Poaceae Poa annua Annual blue grass FAC

Lamiaceae Pogogyne zizyphoroides Sacramento Mesa-mint OBL

Poaceae Polypogon monspeliensis Rabbitsfoot grass FACW

Salicaceae Populus fremontii [deltoides] ssp. fremontii

Fremont's cottonwood FAC

Rosaceae Prunus sp. Cherry tree FACU

Fagaceae Quercus douglasii Blue oak --

Fagaceae Quercus wislizeni Interior live oak --

Ranunculaceae Ranunculus bonariensis var. trisepalus Vernal pool buttercup OBL

Ranunculaceae Ranunculus muricatus Spiny buttercup FACW

Brassicaceae Rorippa curvissiliqua Curvepod yellow cress OBL

Rosaceae Rubus armeniacus Himalayan blackberry FAC

Polygonaceae Rumex crispus Curly dock FAC

Polygonaceae Rumex pulcher fiddledock FAC

Salicaceae Salix exigua Narrow leaved willow FACW

Salicaceae Salix cf. lasiolepis Arroyo willow FACW

Asteraceae Senecio vulgaris Common groundsel FACU

Asteraceae Sonchus asper Prickly sow thistle FAC

Poaceae Stipa pulchra Purple needle grass --

Lamiaceae Trichostema lanceolata Vinegar weed FACU

Fabaceae Trifolium variegatum Variegated clover FAC

Typhaceae Typha sp. Cattail OBL

Scrophulariaceae Verbascum blattaria Moth mullein UPL

Plantaginaceae Veronica cf. americana American brooklime OBL

Fabaceae Vicia sativa Spring vetch FACU

Gentianaceae Zeltnera muehlenbergii Muehlenberg's centaury FAC Scientific and common names from:

Baldwin, B.G.. D.H. Goldman, D.J. Keil, R. Patterson, T.J. Rosatti, D.H. Wilken, editors. 2012. The Jepson Manual: Vascular Plants of California, second edition. University of California Press, Berkley or U.S. Army Corps of Engineers Cold Regions Research and Engineering Laboratory, Arid West 2018 Regional Wetland Plant List

* Acronyms: FAC – facultative, FACU – facultative upland, FACW – facultative wetland, OBL – obligate, UPL – upland; -- Not Listed (considered upland) (USACE 2018)

Appendix DRepresentative Site Photos


El Dorado Hills 52

Representative Site Photos Appendix D

Photo 1: View of wetland data point 7B. Taken 10/13/20.

Photo 2: View of wetland data point 8A. Taken 10/13/20.

El Dorado Hills 52


Photo 3: View of upland data point 8B. Taken 10/13/20.

Photo 4: View of wetland data point 9A. Taken 10/13/20.

El Dorado Hills 52


Photo 5. View of upland data point 9B. Taken 10/13/20.

Photo 6. View of wetland data point 10A. Taken 10/13/20.

El Dorado Hills 52


Photo 7. View of upland data point 10B. Taken 10/13/20.

Appendix EData Sheets


US Army Corps of Engineers Arid West – Version 2.0

WETLAND DETERMINATION DATA FORM – Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes 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:

VEGETATION – Use scientific names of plants. Dominance Test worksheet: Number of Dominant Species That Are OBL, FACW, or FAC: (A) Total Number of Dominant Species Across All Strata: (B) Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet: Total % Cover of: Multiply by: OBL species x 1 = FACW species x 2 = FAC species x 3 = FACU species x 4 = UPL species x 5 = Column Totals: (A) (B)

Prevalence Index = B/A = Hydrophytic Vegetation Indicators: Dominance Test is >50% Prevalence Index is 3.01 Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet) Problematic Hydrophytic Vegetation1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status 1. 2. 3. 4. = Total Cover Sapling/Shrub Stratum (Plot size: ) 1. 2. 3. 4. 5. = Total Cover Herb Stratum (Plot size: ) 1. 2. 3. 4. 5. 6. 7. 8. = Total Cover Woody Vine Stratum (Plot size: ) 1. 2. = Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust

Hydrophytic Vegetation Present? Yes No

Remarks:

El Dorado Hills 52 El Dorado County Dec. 15, 2015

EDH 52, GP CA 1B

Kelly Bayne and Charlotte Marks Township 9 North, Range 8 East, Section 1

Hillslope concave <1

C 38 39 44.15"N 121 03 22.66"W NAD 83

Auburn Silt Loam, 2 to 30 Percent Slopes None✔

✔

✔

✔

✔✔

Festuca perennis 5 Y FAC

5

Ephemeral drainage; although the soils do not meet the definition of a wetland, the feature has an OHWM. Therefore, it is considered an ephemeral drainage.

95

1

1

100

✔

✔


SOIL Sampling Point:

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) 1 cm Muck (A9) (LRR C) Histic Epipedon (A2) Stripped Matrix (S6) 2 cm Muck (A10) (LRR B) Black Histic (A3) Loamy Mucky Mineral (F1) Reduced Vertic (F18) Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Red Parent Material (TF2) Stratified Layers (A5) (LRR C) Depleted Matrix (F3) Other (Explain in Remarks) 1 cm Muck (A9) (LRR D) Redox Dark Surface (F6) Depleted Below Dark Surface (A11) Depleted Dark Surface (F7) Thick Dark Surface (A12) Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1) Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic. Restrictive Layer (if present): Type: Depth (inches):

Hydric Soil Present? Yes No

Remarks:

HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required) Surface Water (A1) Salt Crust (B11) Water Marks (B1) (Riverine) High Water Table (A2) Biotic Crust (B12) Sediment Deposits (B2) (Riverine) Saturation (A3) Aquatic Invertebrates (B13) Drift Deposits (B3) (Riverine) Water Marks (B1) (Nonriverine) Hydrogen Sulfide Odor (C1) Drainage Patterns (B10) Sediment Deposits (B2) (Nonriverine) Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2) Drift Deposits (B3) (Nonriverine) Presence of Reduced Iron (C4) Crayfish Burrows (C8) Surface Soil Cracks (B6) Recent Iron Reduction in Tilled Soils (C6) Saturation Visible on Aerial Imagery (C9) Inundation Visible on Aerial Imagery (B7) Thin Muck Surface (C7) Shallow Aquitard (D3) Water-Stained Leaves (B9) Other (Explain in Remarks) FAC-Neutral Test (D5) 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)

Wetland Hydrology Present? Yes No

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

1B

0-8 7.5YR 3/2 100 None Loam

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Remarks:







Remarks:


EDH 52, GP CA 2B


Hillslope concave 1

C 38 39 45.19"N 121 03 19.74"W NAD 83


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Erodium botrys 40 Yes FACUHolocarpha virgata 20 Yes UPLHordeum murinum 40 Yes FACU

100

0

0

3

0

3208010020

100 420

4.2

✔






Remarks:




2B

0-12 7.5YR 3/4 100 None Loam

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Remarks:







Remarks:


EDH 52, GP CA 3A


Hillslope None 3

C 38 39 42.86"N 121 03 24.91"W NAD 83


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Eleocharis macrostachya 100 Yes OBL

100

1

1

100

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Remarks:




3A

0-12 7.5YR 3/2 80 7.5YR 4/6 20 C PL Loam

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Remarks:







Remarks:


EDH 52, GP CA 3B


Hillslope none 3

C 38 39 43.18"N 121 03 25.71"W NAD 83


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Erodium botrys 40 Yes FACUHolocarpha virgata 20 Yes UPLHordeum murinum 40 Yes FACU

100

0

3

0

3208010020

100 420

4.2

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Remarks:




3B

0-12 7.5YR 3/4 100 None Loam

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Remarks:







Remarks:


EDH 52, GP CA 4A


Perennial marsh concave 3

C 38 39 36.82"N 121 03 26.80"W NAD 83


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Eleocharis macrostachya 95 Yes FACWTypha sp. 5 No OBL

100

0

1

1

100

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Remarks:




4A

0-8 10YR 2/2 80 10YR4/6 20 C PL Clay/Loam

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316














Remarks:







Remarks:


EDH 52, GP CA 4B


Hillslope convex 2

C 38 39 36.25"N 121 03 26.29"W NAD 83


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Eleocharis macrostachya 91 Yes FACWErodium cicutarium 5 N UPLGeranium molle 2 N UPLHypericum perforatum 2 N FACU

100

1

1

100

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Remarks:




4B

0-12 10YR 3/3 100 None Loam Roots

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Remarks:







Remarks:


EDH 52, GP CA 5B


Hillslope convex 2

C 38 39 36.25"N 121 03 26.29"W NAD 83


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Avena fatua 70 Yes UPLErodium cicutarium 5 No UPLGeranium molle 2 No UPLHolocarpha virgata 5 No UPLBromus hordeaceus 18 No FACU

100

0

0

1

0

721841082

100 482

4.82

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Remarks:




5B

0-12 10YR 3/3 100 None Loam Roots

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Remarks:







Remarks:


EDH 52, GP CA 6A



C 38 39 37.64"N 121 03 25.63"W NAD 83


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0

Appears man-made; depressional with perimeter mound. No vegetation at time of sampling.

0

0

0

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no vegetation present at time of survey; assumed to be wet.






Remarks:




6A

0-8 7.5YR 3/2 95 7.5YR 5/8 5 C PL Loam Distinct mottles

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Remarks:







Remarks:

El Dorado Hills 52 El Dorado County Oct. 13, 2020

EDH 52, GP CA 7B

Patrick Martin, Halie Goeman Township 9 North, Range 8 East, Section 1


C 38 39 37.64"N 121 03 25.63"W NAD 83


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0

Quercus lobata 5 Y FACU

5

Carex praegracilis 40 Y FACWAvena fatua 10 N --Stipa pulchra 12 Y --Deschampsia danthonioides 10 N FACWBromus madritensis 8 N UPLTorilis arvensis 5 N --Bromus diandrus 10 N --

0

0

Low area along ephemeral stream with hydrophytes, but supports a dominance of upland vegetation and lacks other wetland criteria. This is likely a floodplain in uplands that rarely floods.

5

1

3

33

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Dominated by upland species and supports some hydrophytes.






Remarks:




7B

0-10 10YR 3/4 100 silt Loam rocky

No hydric soil indicators detected.

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Remarks:







Remarks:


EDH 52, GP CA 8A



C 38 39 37.64"N 121 03 25.63"W NAD 83


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0

Deschampsia danthonioides 15 Y FACWEleocharis macrostachya 20 Y OBLTorilis arvensis 5 N --Bromus diandrus 10 N --Stipa pulchra 5 N --

55

0

Herbaceous riparian wetland along ephemeral stream.

45 0

2

2

100

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Dominated by hydrophytes.






Remarks:




8A

0-12 7.5YR 4/2 90 7.5YR 4/6 10 C M silt Loam rocky

Prominent redoximorphic features in the matrix and pore linings in depleted soil support the hydric soil indicator Depleted Matrix (F3).

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Low area likely floods during precipitation events and likely has a high water table during the growing season.














Remarks:







Remarks:


EDH 52, GP CA 8B



C 38 39 37.64"N 121 03 25.63"W NAD 83


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0

Quercus lobata 8 Y FACU

8

Bromus diandrus 40 Y --Carduus pycnocephalus ssp. pycnocephalus 10 Y --

50

0

Low floodplain dominated by upland vegetation.

50 0

0

3

0

32825050

58 282

4.9

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Dominated by upland vegetation.






Remarks:




8B

0-12 7.5YR 4/2 90 7.5YR 4/6 10 C M/PL silt Loam rocky

Prominent redoximorphic features in the matrix and pore linings in depleted soil support the hydric soil indicator Depleted Matrix (F3).

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Low area likely floods during precipitation events and likely stays saturated enough to form oxidized rhizospheres along the living root channels.














Remarks:







Remarks:


EDH 52, GP CA 9A



C 38 39 37.64"N 121 03 25.63"W NAD 83


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0

Baccharis pilularis 10 Y --

10

Juncus xiphioides 90 Y OBLStipa pulchra 10 N --

100

0

Seep spring dominated by obligate wetland plant Juncus xiphioides.

0 0

2

2

100

90 90

10020110 190

1.7

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Isolated patch of Juncus xiphioides represents a seep spring. Occurs in annual grassland where perennial bunchgrass Stipa pulchra is encroaching on this seep spring.






Remarks:




9A

0-10 7.5YR 3/2 90 7.5YR 4/6 10 C M/PL Loam

Prominent redoximorphic features in the matrix and pore linings on a dark surface support the hydric soil indicator Redox Dark Surface (F6).

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Seep spring dominated by obligate wetland plants likely has a high water table during the growing season.














Remarks:







Remarks:


EDH 52, GP CA 9B



C 38 39 37.64"N 121 03 25.63"W NAD 83


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0

0

Stipa pulchra 90 Y --Epilobium brachycarpum 10 N FAC

100

0

Seep spring dominated by obligate wetland plant Juncus xiphioides.

0 0

0

1

100

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Stipa pulchra perennial grassland on edge of seep spring.






Remarks:




9B

0-10 7.5YR 3/3 100 Loam

No hydric soil indicators detected.

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No wetland hydrology indicators detected.














Remarks:







Remarks:


EDH 52, GP CA 10A



C 38 39 37.64"N 121 03 25.63"W NAD 83


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0

0

Epilobium brachycarpum 25 Y FACLythrum hyssopifolium 20 Y OBLBriza minor 10 N FACPolygon monspeliensis 20 Y FACWMentha pulegium 25 Y OBL

100

0

Herbaceous seasonal wetland along stream.

0 0

4

4

100

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Dominated entirely by hydrophytes.






Remarks:




10A

0-12 7.5YR 3/2 90 7.5YR 4/6 10 C M/PL clay loam

Prominent redoximorphic features on a dark surface fulfill hydric soil criteria for Redox Dark Surface (F6).

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Seasonal wetland along drainage is very wet. Soil is damp in the soil pit but it is not saturated. During the growing season, this data point likely has a high water table.














Remarks:







Remarks:


EDH 52, GP CA 10B



C 38 39 37.64"N 121 03 25.63"W NAD 83


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0

0

Acmispon americanus 25 Y UPLLactuca seriola 20 Y FACUEpilobium brachycarpum 20 Y FACBromus hordeaceus 20 Y FACU

85

0

Upland area along seasonal wetland near stream.

15 0

1

4

25

60201604025025

85 345

4.1

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Dominated by upland vegetation.






Remarks:




10B

0-4 7.5YR 3/4 100 clay loam

Hardpan4

No hydric soil indicators detected. Hard layer at 4 inches.

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No wetland hydrology detected.

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El Dorado Hills 52 Project - edhapac.org