Appendix B Preliminary Jurisdictional Delineation · The field delineation was conducted on April 21, May 9, May 17, July 27, and July 28, 2017 and April 4, 2018. A total of 6.548

Appendix B Preliminary Jurisdictional Delineation

PRELIMINARY DELINEATION OF WATERS OF THE UNITED STATES, INCLUDING WETLANDS, FOR THE

PACIFIC GAS & ELECTRIC COMPANY R-914 L-021G PIPELINE REPLACEMENT PROJECT IN MARIN COUNTY, CALIFORNIA

SUBMITTED TO:

U.S. Army Corps of Engineers San Francisco District 1455 Market Street, 16th Floor San Francisco, California 94103-1398

P R E P A R E D F O R : P R E P A R E D B Y :

Pacific Gas and Electric Company Environmental Management–Gas Transmission 6111 Bollinger Canyon Rd San Ramon, CA 94583 Attn: Sean Poirier (925) 328-5113 Email: [email protected]

Stantec Consulting Services, Inc. 555 Capitol Mall Sacramento, CA 95814 Attn: John Holson (916) 669-5978 Email:[email protected]

May 2018

Pacific Gas and Electric Company. 2018. Preliminary Delineation of Waters of the United States, Including Wetlands, for the PG&E R-914 L-021G 1.62MI MP 18.12-20.07 Pipeline Replacement Project. May 2018. Marin County, CA. Prepared by Stantec Consulting Services, Inc., Sacramento, CA.

Preliminary Determination of Waters of the United States, Including Wetlands i PG&E R-914 L-021G Pipeline Replacement Project

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Contents

PG&E R-914 L-021G 1.62MI MP 18.12-20.07 Pipeline Replacement Project Preliminary Delineation of Waters of the United States, Including Wetlands ......................................................................... 1

Summary ................................................................................................................................................................ 1 Introduction ............................................................................................................................................................. 1

Contact Information ......................................................................................................................................... 1 Site Description and Location .......................................................................................................................... 2 Driving Directions ............................................................................................................................................. 2 Precipitation and Growing Season ................................................................................................................... 2 Vegetation ........................................................................................................................................................ 3 Hydrology ......................................................................................................................................................... 4 Soils ................................................................................................................................................................. 4

Delineation Methods ............................................................................................................................................... 5 Results .................................................................................................................................................................... 6

Wetlands .......................................................................................................................................................... 8 Other Waters ................................................................................................................................................. 11

References Cited .................................................................................................................................................. 12 Appendix A Project Wetland Delineation Map Appendix B WETS Table Appendix C Dominant Plant Species Observed in the Study Area Appendix D Routine Wetland Delineation Forms Appendix E Representative Photographs Table 1 Soil Map Units Occurring in the Study Area 2 Summary of Wetlands and Other Waters in the Study Area

Preliminary Determination of Waters of the United States, Including Wetlands 1 PG&E R-914 L-021G Pipeline Replacement Project

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PG&E R-914 L-021G Pipeline Replacement Project Preliminary Delineation of Waters of the United States,

Including Wetlands

Summary On behalf of Pacific Gas and Electric (PG&E), Stantec Consulting Services, Inc. (Stantec) conducted a delineation of wetlands and waters of the United States for the PG&E R-914 L-021G 1.62MI MP 18.12-20.07 Pipeline Replacement Project, which is located in San Rafael, Marin County, California. The study area (Appendix A. Project Wetland Delineation Map) consists of approximately 8,500 foot pipeline replacement project that occurs primarily in residential, commericial, and open space areas of San Rafael. The delineation was conducted in accordance with the Corps of Engineers Wetlands Delineation Manual (U.S. Army Corps of Engineers 1987), and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (U.S. Army Corps of Engineers 2008a).

The purpose of this delineation is to document and describe waters of the United States to support a Preliminary Jurisdictional Determination from the United States Army Corps of Engineers (Corps). This delineation of waters of the United States is subject to verification by the Corps, San Francisco District. Stantec advises all parties to treat the information contained herein as preliminary until the Corps provides written verification of the boundaries of its jurisdiction.

The determinations concerning waters of the United States, including wetlands, were based on current conditions, (i.e., normal circumstances) and made in accordance with relevant U.S. Environmental Protection Agency and Corps guidance. The determinations are subject to verification by the Corps. Stantec advises all interested parties to treat the information contained herein as preliminary pending written verification of jurisdictional boundaries by the Corps.

Introduction The field delineation was conducted on April 21, May 9, May 17, July 27, and July 28, 2017 and April 4, 2018. A total of 6.548 acres of wetlands and other waters of the United States were mapped within the study area (see Appendix A. Project Delineation Map) and include salt marsh (1.508 acres), emergent marsh (2.898 acre), seasonal wetlands (1.661 acre), riparian scrub (0.283 acre), two tidal drainages (0.161 acre), and an ephemeral drainage (0.037 acre).

Contact Information If the Corps wishes to conduct a field verification, PG&E requests that the Corps contact Sean Poirier, PG&E Land Planner (contact information provided below) to schedule a date and time to access the study area.


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Project Applicant Delineation Preparer

Pacific Gas and Electric Company 6111 Bollinger Canyon Rd San Ramon, CA 94583 Attn: Sean Poirier (925) 328-5113 Email: [email protected]

Stantec 555 Capitol Mall Sacramento, CA 95814 (916) 669-5978 ext. 204 Attn: John Holson Email:[email protected]

Site Description and Location The study area (sized 30.70 acres) consists of a linear gas transmission line stretching from southwest of Civic Center Drive and McInnis Parkway to north of the intersection of Silveira Parkway and North Avenue (north of McInnis Park Apartments), a total distance of approximately 8,500 feet. The study area is shown on the San Rafael, California U.S. Geological Survey 7.5-minute quadrangle, and the approximate center is located at latitude 38.009178°, longitude -122.530560° (North American Datum 83). The study area is located approximately 1.4 miles west of the San Francisco Bay. Dominant land uses include commercial, residential, and open space areas.

Driving Directions To access the study area from downtown San Francisco, travel north on US-101 north approximately 14 miles, and take exit 456 to Smith Ranch Road. Turn right onto Smith Ranch Road for 0.6 miles until it intersects with the Sonoma – Marin Area Rail Transit. The gas line parallels the railroad on the west side and the south fork of Gallinas Creek on the east side.

Precipitation and Growing Season The topography of the study area is nearly level, with the landscape gradually sloping towards the San Francisco Bay in the east. Elevations in the study area range between approximately 5 and 40 feet above mean sea level (msl). Historical data used to describe the climate is collected at San Rafael Civic Center, approximately 0.2 mile west of the study area (Western Regional Climate Center 2017). The climate data is described in the Wetlands Climate Table (WETS) provided in Appendix B and summarized below:

• Type: The climate of the area is characterized by a Mediterranean climate with moderate winters and warm, dry summers.

• Precipitation: Precipitation in the study area primarily occurs as rain. The average annual rainfall is approximately 35 inches.

• Air Temperature: Air temperatures in the study area range between an average January high of 56.4 degrees Fahrenheit (ºF), and an average July high of 81.3ºF. The annual average high is approximately 70.1ºF.


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Vegetation Vegetation communities in the study area were classified based on the descriptions provided in A Manual of California Vegetation, Second Edition (Sawyer et al. 2009). The vegetation in the study area consists of wild oats grasslands, harding grass swards, coast live oak woodland, ornamental, arroyo willow thickets, Himalayan blackberry thickets, pickleweed mats, salt marsh bulrush marshes, soft rush marshes, cattail marshes, and Baltic rush marshes. The dominant plant species observed in the study area are presented in Appendix C.

Upland Land Cover Vegetation Types • Wild Oats Grassland. Wild oats grassland habitat occurs thoughout the project site

in upland, open space areas. Vegetation consists of opportunistic ruderal grass and forb species such as wild oats (Avena sp.), soft brome (Bromus hordeaceus), wild radish (Raphanus sativus), Italian thistle (Carduus pycnocephalus), and Mediterrenean mustard (Hirschfeldia incana).

• Harding Grass Swards. Harding grass vegetation occurs throughout the study area, generally just on the edges of some of the larger marshes on site. This vegetation is dominated by harding grass (Phalaris aquaticus), and contains smaller amounts of the aforementioned grassland species such as wild oats and Italian thistle.

• Coast Live Oak Woodland. The coast live oak forest community occurs in the middle of the study area in an area of open space. It is characterized by large coast live oak (Quercus agrifolia) trees with a grassland understory. In addition to the oak trees, grass and forb species such as wild oats, soft brome, and harvest brodiaea (Brodiaea elegans) occur in the understory.

• Ornamental. This vegetation type occurs throughout the project, both in the residential and commercial areas adjacent to the study area. Tree species in this vegetation include blue gum (Eucalyptus globulus), pepper tree (Schinus molle), California plane tree (Platanus racemosa), and ornamental pear (Pyrus calleryana).

• Himalayan Blackberry Thickets (Upland). Himalayan blackberry thickets vegetation was observed in both designated upland and wetlands communities on site. The upland component of this community occurs south of the Gallinas Creek north fork crossing. It is considered upland as it only met one (vegetation) of the three Corps wetland criteria. This vegetation is composed of dense, monotypic, Himalayan blackberry (Rubus armeniacus) vines 5 to 10 feet in height.

Wetland Land Cover Vegetation Types Associated wetland types are in parentheses. Please note that they are shown on the delineation map by their designated wetland type (Appendix B).

• Pickleweed Mats (Emergent Marsh). Pickleweed mats vegetation occurs on the edges of the north fork of Gallinas Creek, just south of Smith Ranch Road. This vegetation type is dominated by salt marsh pickleweed (Sarcocornia pacifica), with salt grass (Distichlis spicata) and salt marsh bulrush (Bulboschoenus maritimus) occurring as well in smaller quantities.


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• Salt Marsh Bulrush Marshes (Emergent Marsh). Salt marsh bulrush marshes vegetation occurs on the edges of the south fork of Gallinas Creek in southern portion of the study area, just north of Civic Center Drive. This vegetation is dominated by salt marsh bulrush, with species such as salt grass and rough cocklebur (Xanthium strumarium) occurring as well.

• Soft Rush Marshes (Emergent Marsh). North of Myrtle Avenue, within the perennial rye grass fields (wet meadow wetlands) vegetation, is a separate community dominated by soft rush (Juncus effusus). This vegetation, termed soft rush marshes, is dominated by clumps of soft rush, with wetland species such as iris-leaved juncus (Juncus xiphioides), perennial rye grass (Festuca perenne), and rabbitfoot grass (Polypogon monspeliensis) occurring in between clumps.

• Cattail Marshes (Emergent Marsh). Just south of Myrtle Avenue, tucked within the upland blackberry thicket vegetation, is a separate community dominated by cattail (Typha latifolia). This vegetation, termed cattail marshes, is dominated by cattails forming a nearly monotypic stand.

• Baltic Rush Marshes (Seasonal Wetland). Baltic rush marshes vegetation occurs just outside the ordinary high water mark of OW-3, in between the toe of a slope to the west and the edges of the channel to the east. In addition, this vegetation type occurs parallel to the railroad in the northern half of the study area. This vegetation is dominated by Baltic rush (Juncus articus var. balticus), and contains smaller amounts of species such as iris-leaved juncus, perennial rye grass, pale spikerush (Eleocharis macrostachya), and curly dock (Rumex crispus).

• Himalayan Blackberry Thickets (Riparian Scrub Wetland). The wetland component of this vegetation type makes up the riparian scrub wetland type observed on site. Located in between two large soft rush marshes in the middle of the study area, this vegetation is composed of dense, monotypic, Himalayan blackberry vines 3 to 6 feet in height.

• Arroyo Willow Thickets (Riparian Scrub Wetland). The wetland component of this vegetation type makes up the riparian scrub wetland type observed on site. Located at the north end of the study area, this vegetation is composed of dominated by arroyo willow trees, with Himalayan blackberry vines in the understory.

Hydrology Hydrology in the study area is driven by local drainages, creeks, and ditches as well as tidal influence from the San Francisco Bay. The north and south forks of Gallinas Creek in the study area generally follow the existing topography and drain freshwater east to the San Francisco Bay, which is considered a traditional navigable water (TNW). During high tide, however, the flow is reversed and brackish/salt water enters the creek from the San Francisco Bay.

Soils Five soil map units occur in the study area and are described in the Web Soil Survey (Natural Resources Conservation Service 2017). Four soil map units in the study area are considered hydric; Xerorthents-Urban land complex (0 to 9 percent slopes), Reyes Clay, Blucher-Cole


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complex (2 to 5 percent slopes), and Novato Clay. Details on the soil types can be viewed below in Table 1.

Table 1. Soil Map Units Ocurring in the Study Area

Soil Map Unit Name Hydric (Yes/No) Drainage Class Landform

Blucher-Cole complex, 2 to 5 percent slopes

Yes Somewhat poorly drained

Basin floors

Novato Clay Yes Very poorly drained Tidal marshes

Reyes Clay Yes Somewhat poorly drained

Tidal marshes

Xerorthents, fill No -- Valley floors/backslope

Xerorthents-Urban land complex (0 to 9 percent slopes)

Yes -- Tidal flats/salt marshes

Delineation Methods Stantec conducted an on-site routine delineation of wetlands and “other waters” of the United States based on field observations of positive indicators for wetland vegetation, hydrology, and soils; and indicators of an ordinary high water mark (OHWM). This methodology is consistent with the approach outlined in the Corps of Engineers Wetlands Delineation Manual (U.S. Army Corps of Engineers 1987), and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (U.S. Army Corps of Engineers 2008a). Taxonomic nomenclature for plant species is in accordance with The Jepson Manual: Vascular Plants of California (Baldwin et al. 2012). Wetland indicator status for plant species was confirmed using The National Wetland Plant List (Lichvar et al. 2016), and the “50/20 Rule” or “Prevalence Index” was applied to determine plant dominance (U.S. Army Corps of Engineers 2008a). Presence of primary and secondary wetland hydrology indicators were documented for each wetland feature. The OHWM was determined using the approach outlined in A Field Guide to the Identification of the OHWM in the Arid West Region of the Western United States (U.S. Army Corps of Engineers 2008b). Wetlands and other waters exhibiting atypical conditions were delineated in accord with the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region for situations involving atypical hydric soils.

Soil pits were dug in each representative wetland feature to a depth sufficient to document the presence or confirm the absence of hydric soil or hydrology indicators. Soils were examined to assess field indicators of hydric soils. Positive indicators of hydric soils were observed in the field in accordance with the criteria outlined in Field Indicators of Hydric Soils in the United States (Vasilas et al. 2010). Soil colors were determined using a Munsell® soil color chart. The hydric status of each soil map unit occurring in the study area was reviewed using the Web Soil Survey (Natural Resources Conservation Service 2017). At least one set of data points was selected to best represent the wetland feature type and the adjacent uplands. Data points were also placed in suspect areas to confirm wetland or upland status.


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Prior to conducting the on-site routine delineation, the U.S. Fish and Wildlife Service’s National Wetlands Inventory Wetlands Mapper (U.S. Fish and Wildlife Service 2018) was reviewed to determine if any wetlands or deepwater habitats as described by Cowardin et al. (1979) have been previously mapped in the study area. Features delineated during the on-site routine delineation were classified using Cowardin (1979) based on existing National Wetlands Inventory mapping, or assigned a Cowardin type if not previously mapped. The Corps Aquatic Resources Excel spreadsheet, which includes specific information about the wetland and other waters features delineated, including their Cowardin type, was completed and submitted as a separate deliverable with this report.

Twenty-four data points were located to characterize and document each wetland or other water feature type, and the adjacent upland. Field observations were conducted on April 21, May 9, May 17, July 27 and July 28, 2017, and April 4, 2018.

The boundaries of delineated features and the associated data points were mapped using a Trimble Mapping Grade Global Positioning System (GPS) capable of sub-foot accuracy. Where the use of the GPS was not practicable or satellites were not available, the features were delineated by hand onto ortho-rectified color aerial photographs. The GPS and hand-drawn location data were overlaid onto an aerial photograph of the study area to develop the delineation map.

Results Potential waters of the United States occur in the study area as wetlands and other waters, and include seven salt marsh wetlands and two tidal drainages (Gallinas Creek).

The boundaries and acreages of the waters of the United States occurring in the study area are illustrated in Appendix A. A total of 6.548 acres of waters of the United States were delineated. A summary of the delineated features is presented in Table 2. Routine wetland determination data forms are presented in Appendix D. Representative photographs of the delineated features and data point locations are presented in Appendix E.

Table 2. Summary of Wetlands and Other Waters in the Study Area

Potential Waters Type

Total Acreage in Study Area

Cowardin Type1

Vegetation Type

Wetlands

SM-1 Salt Marsh Wetland 0.564 E2 Salt Marsh Bulrush Marshes

SM-2 Salt Marsh Wetland 0.517 E2 Salt Marsh Bulrush Marshes

1 Cowardin et al. 1979


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Cowardin Type1

Vegetation Type

SM-3 Salt Marsh Wetland 0.275 E2 Pickleweed Mats

SM-4 Salt Marsh Wetland 0.152 E2 Pickleweed Mats

EM-1 Emergent Wetland 0.156 PEM1 Soft Rush Marshes


EM-3 Emergent Wetland 0.011 PEM1 Cattail Marshes



SW-1 Seasonal Wetland 0.159 PEM2 Baltic Rush Marshes









RS-1 Riparian Scrub 0.156 RP Himalayan Blackberry Thicket

RS-2 Riparian Scrub 0.127 RP Arroyo Willow Thickets


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Cowardin Type1

Vegetation Type

Total Wetlands 6.349

Other Waters of the United States

TD-1 Tidal drainage (South Fork Gallinas Creek)

0.035 R1 N/A

TD-2 Tidal drainage (North Fork Gallinas Creek)

0.127 R1 N/A

ED-1 Ephemeral Drainage 0.024 R4 N/A

ED-2 Ephemeral Drainage 0.013 R4 N/A

Total Other Waters of the United States 0.199

Total Waters of the United States 6.548

Wetlands Salt Marsh

Salt marsh occurs as four wetlands; two of these (SM-1 and SM-2) are at southern end of the site, paralleling the south fork of Gallinas Creek along the west side of the railroad tracks.The other two (SM-3 and SM-4) occur at the north end of the project site, on either side of the north fork of Gallinas Creek (Appendix A). All four of these wetlands are situated at a lower elevation than the surrounding urban zones, and receive precipitation, subsurface flows, and tidal water from Gallinas Creek and the surrounding area.

As described below, SM-1, SM-2, SM-3, and SM-4 contain hydrophytic vegetation and exhibit indicators of wetland hydrology and hydric soils. Therefore, they possess all three diagnostic environmental characteristics necessary to qualify as a wetland as defined by the Corps (U.S. Army Corps of Engineers 1987). Adjacent upland areas lack one or more of these diagnostic characteristics.

Vegetation Vegetation in the wetlands can be classified as hydric as the wetlands met the dominance test hydrophytic vegetation indicator. One hundred percent of the dominant species are more likely to occur in wetlands than wetlands. The dominant vegetation within SM-1,and SM-2 includes salt marsh bulrush and saltgrass. The dominant vegetation within SM-3 and SM-4 includes salt marsh pickleweed, saltgrass, and salt marsh bulrush. The indicator status of these species can be seen in Appendix B, Dominant Plant Species in Study Area.


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Soils The soils observed in the wetlands exhibited hydric soil indicators, with all four wetlands observed as having depleted matrix (Indicator F3). This indicator is a result of iron being reduced in an anaerobic state and commonly occurs in areas that are permanently saturated or inundated. Therefore, soils were considered hydric in these wetlands.

Hydrology The wetlands exhibited two primary indicators of wetland hydrology. Surface water was present in SM-1 and SM-2 (Indicator A3). In all four wetlands the soils were saturated to the surface during both high and low tides (Indicator A3). Only at high tide did wetlands SM-3 and SM-4 show surface water (Indicator A1).

Emergent Wetlands Emergent wetlands occur in several areas on site that get more water due to flows and/or topography (i.e. depressions and swales). Two of the emergent wetlands (EM-1 and EM-2) occur in the middle of the study area, while three occur in the northern portion (EM-3, EM-4, and EM-5). These wetlands receive water from precipitation, subsurface flows, and runoff from the surrounding area.

As described below, the emergent wetlands contain hydrophytic vegetation and exhibit indicators of wetland hydrology, and hydric soils. Therefore, they possess all three diagnostic environmental characteristics necessary to qualify as a wetland as defined by the Corps (U.S. Army Corps of Engineers 1987). Adjacent areas lack one or more of these diagnostic characteristics.

Vegetation Vegetation in these wetlands can be classified as hydric as the wetlands met the dominance test hydrophytic vegetation indicator. In all cases the dominant species are more likely to occur in wetlands than uplands. The dominant vegetation in the perennial emergent wetlands can be classified as soft rush marshes (EM-1, EM-2, EM-4, and EM-5) and cattail marshes (EM-3). Dominant species in these vegetation types are soft rush and cattail, respectively. The indicator status of these species can be seen in Appendix C, Dominant Plant Species in Study Area.

Soils The soils observed in the wetland exhibited hydric soil indicators, with the all data points in these wetlands observed as having depleted matrix (Indicator F3). This indicator is a result of iron being reduced in an anaerobic state and commonly occurs in areas that are permanently saturated or inundated. Therefore, soils were considered hydric in these wetlands.

Hydrology The wetlands exhibited three and in some cases four primary indicators of wetland hydrology. The water table was within 4 to 6 inches of the surface (Indicator A2), soil was saturated to the surface (Indicator A3), and a hydrogen sulfide odor (Indicator C1). In addition, EM-3 had surface water (Indicator A1). Therefore, wetland hydrology was considered present in these wetlands.


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Seasonal Wetlands Seasonal wetlands occur in the middle area of the project site (SW-1 through SW-9), in between the railroad tracks to the east and the housing developments on the west side. They receive precipitation, tidal flows, subsurface flows, and runoff from the surrounding area.

As described below, the wetlands contain hydrophytic vegetation and exhibit indicators of wetland hydrology, and hydric soils. Therefore, they possess all three diagnostic environmental characteristics necessary to qualify as a wetland as defined by the Corps (U.S. Army Corps of Engineers 1987). Adjacent areas lack one or more of these diagnostic characteristics.

Vegetation Vegetation in the wetlands can be classified as hydric as the wetlands met the dominance test hydrophytic vegetation indicator. The majority of the dominant species are more likely to occur in wetlands than uplands. The dominant vegetation within these wetlands includes Baltic rush and Italian rygrass with species such as curly dock, rough cocklebur, and iris-leaved rush occurring as well in smaller quantities. The indicator status of these species can be seen in Appendix C, Dominant Plant Species in Study Area.

Soils The soils observed in the wetlands exhibited hydric soil indicators, with all the data points in these wetlands observed as having depleted matrix (Indicator F3). This indicator is a result of iron being reduced in an anaerobic state and commonly occurs in areas that are permanently saturated or inundated. Therefore, soils were considered hydric in these wetlands.

Hydrology The wetlands exhibited one or more primary indicators of wetland hydrology. Indicators observed include algal mat or crust (B4), and a hydrogen sulfide odor (Indicator C1). Therefore, wetland hydrology was considered present in these wetlands.

Riparian Scrub Wetland A Himalayan blackberry riparian scrub wetland (RS-1) occurs in between EM-1 and EM-2 in the middle of the project area, and an Arroyo willow riparian scrub wetland (RS-2) at the northernmost end of the project area. Wetland RS-1 contains Himalayan blackberry shrubs that form an almost continuous canopy. Wetland RS-2 is dominated by Arroyo willow shrubs, with other species such as Coast live oak, black walnut (Juglans californica), and Himalayan blackberry occurring as well but in smaller quantities. These wetlands receives precipitation, tidal flows, subsurface flows, and runoff from the surrounding area.

As described below, these wetlands contains hydrophytic vegetation and exhibit indicators of wetland hydrology, and hydric soils. Therefore, it possesses all three diagnostic environmental characteristics necessary to qualify as a wetland as defined by the Corps (U.S. Army Corps of Engineers 1987). Adjacent areas lack one or more of these diagnostic characteristics.

Vegetation Vegetation in the wetlands can be classified as hydric as the wetland met the dominance test hydrophytic vegetation indicator. The majority of the dominant species are more likely to occur in


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wetlands than uplands. The vegetation consisted of almost entirely of Himalayan blackberry in RS-1, and was dominated by arroyo willow in RS-2. The indicator status of this species can be seen in Appendix C, Dominant Plant Species in Study Area.

Soils The soils observed in the wetland exhibited hydric soil indicators, with all the data points in these wetlands observed as having depleted matrix (Indicator F3). This indicator is a result of iron being reduced in an anaerobic state and commonly occurs in areas that are permanently saturated or inundated. Therefore, soils were considered hydric in these wetlands.

Hydrology The wetland exhibited two primary indicators of wetland hydrology. The soil had surface soil cracks (Indicator B6) and water-stained leaves (Indicator B9). Therefore, wetland hydrology was considered present in these wetlands.

Other Waters Tidal Drainage (Gallinas Creek)

Two forks of Gallinas Creek (north and south), classified as a tidal drainage (TD-1 and TD-2), occur on the project site flowing from east to west and north to south, respectively, with freshwater during times of low tide, and reverse flow with brackish/saltwater during times of high tide. An abrupt change in vegetation community was used to determine the high tide line, per the guidance in the Corps regulations (33 CFR 328.3). Other high tide line indicators observed at the seasonal drainage were sediment deposition and the presence of litter and debris.

Sources of water for the north and south forks of Gallinas Creek include surface runoff, precipitation, residential irrigation, and tidal water from the San Francisco Bay. Gallinas Creek is hydrologically connected to the San Francisco Bay approximately 1.4 miles to the east of the project site.

Ephemeral Drainage Two ephemeral drainages occur on site, ED-1 and ED-2, as seen in Appendix A. ED-1 occurs in the middle portion of the study area, draining water from the nearby open space and residential areas into the Gallinas Creek. The other ephemeral drainage, ED-2, occurs in the middle portion of the study area, draining water from the nearby open space and residential areas into the Gallinas Creek. The presence of a bed and bank and an abrupt change in vegetation community was used to determine the OWHM for both of these drainages, per the guidance in the Corps regulations (33 CFR 328.3). Other OHWM indicators observed at the ephemeral drainages were sediment deposition and the presence of litter and debris.

Sources of water for the drainages include surface runoff, precipitation, and residential irrigation. This drainage is connect to the south fork of Gallinas Creek; Gallinas Creek is hydrologically connected to the San Francisco Bay approximately 1.4 miles to the east of the project site.


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References Cited Baldwin, B. G., D. H. Goldman, D. J. Keil, R. Patterson, T. J. Rosatti, and D. H. Wilken, editors. 2012. The Jepson manual: vascular plants of California, second edition. University of California Press, Berkeley, California.

Cowardin, L. M., Carter, V., Golet, F., LaRoe, E. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Department of the Interior. Fish and Wildlife Service.

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.

Natural Resources Conservation Service. 2016. Web Soil Survey. Sacramento County, California. http://websoilsurvey.nrcs.usda.gov/app/ cited February 2, 2017.

Sawyer, J. O., T. Keeler‐Wolf, and J. M. Evens. 2009. A Manual of California Vegetation, 2nd edition. California Native Plant Society, Sacramento, CA.

U.S. Army Corps of Engineers. 1987. Corps of Engineers Wetlands Delineation Manual. U.S. Army Engineer Waterways Experiment Station, Environmental Laboratory. Report No. Y-87-1.

U.S. Army Corps of Engineers. 1993. Marin County Shoreline Study, San Rafael Canal. Corps of Engineers, San Francisco District. San Francisco, California.

U.S. Army Corps of Engineers. 2008a. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0). U.S. Army Engineer Research and Development Center.

U.S. Army Corps of Engineers. 2008b. A field guide to the Identification of the Ordinary High Water Mark (OHWM) in the arid west region of the western United States. U.S. Army Engineer Research and Development Center.

Vasilas, L. M.,G. W. Hurt, and C. V. Noble, eds. 2010. Field indicators of hydric soils in the United States. A guide for identifying and delineating hydric soils. Version 7.0 ed: USDA, NRCS in cooperation with the National Technical Committee for Hydric Soils.

Western Regional Climate Center. 2017. San Rafael Civic CTR, California (047880) Period of Record Monthly Climate Summary, Period of Record: 01/01/1894 to 05/31/2017.

Appendix A Project Wetland Delineation Map

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Tidal Drainage (0.161 ac)Salt Marsh (1.508 ac)Ephemeral Drainage (0.037 ac)Emergent Marsh (2.898 ac)Riparian Scrub (0.282 ac)Seasonal Wetland (1.661 ac)

!. Upland data point!. Wetland data point

!( Photo Location

Ordinary High Water Mark (OHWM)

Mean High Tide Line (MHTL)

Study Area (30.70 ac)

Pacific Gas and Electric CompanyGas Transmission Pipeline Replacement Project

Order No. 74008652: R-914 Pipeline ReplacementWetland Delineation Map

Sheet 1 of 8

Waters of the U.S.Proposed Pipeline AlignmentBell HoleHDD PitWork AreaPipe String and Laydown AreaStaging AreaProposed HDD Alignment

Project Components

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RS-1SM-2

TD-1

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Bell Holefor Retirement

HDD1 Exit Pit HDD2 Entry Pit

MHTLOHWM

MHTL

Dp-1

Dp-2

Dp-3

Dp-4Dp-18

Dp-19Dp-20

Dp-21

Dp-22

Dp-23 Dp-24 Dp-25 ED-1

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!.!. !.!.

!.!.

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McInnis Pkwy

Yosemite Rd

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Bell Hole for Retirement

HDD1 Exit Pit HDD2 Entry Pit

Dp-1Dp-2

Dp-5 Dp-6

Dp-7

Dp-8

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SW-2 SW-3

SW-4 SW-5

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Project Components

!.!.

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Yosemite RdYosemite Rd

Glacier Way

Silveir

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Gallinas Creek

Bell Hole for Retirement MHTLMHTL

Dp-7

Dp-8

Dp-9Dp-10

Dp-11Dp-12

Dp-13

TD-2

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Sheet 4 of 8


Project Components

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Yosemite Rd

Silveira

Pkwy Smith Ranch Road

Silveira Pkwy

Silveira Pkwy

North Ave

Galli nas Creek

HDD2 Exit Pit Bell Hole for Retirement

Bell Hole for Retirement

MHTLMHTL

Dp-12Dp-13 Dp-14

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SM-41011

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Sheet 5 of 8


Project Components

!. !.

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Silveira Pkwy

North Ave

Smith Ranch Rd

Bell Hole for Retirement Bell Hole for sniff hole

OHWMED-2

EM-4 SW-8SW-9 SW-9

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Project Components

EM-5EM-5

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Project Components

EM-5 EM-5 RS-2

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Sheet 8 of 8


Project Components

Appendix B WETS Table

WETS Table

WETS Station: SAN RAFAEL-CIVIC CENTER, CA

Requested years: 1971 - 2018

Month Avg Max Temp

Avg Min Temp

Avg Mean Temp

Avg Precip

30% chance

precip less than

30% chance precip

more than

Avg number days precip

0.10 or more

Avg Snowfall

Jan 56.2 41.8 49.0 6.88 2.99 8.11 8 0.0

Feb 61.0 43.9 52.4 6.71 2.55 8.12 7 0.0

Mar 64.4 45.3 54.8 4.53 1.90 5.42 7 0.0

Apr 68.1 47.0 57.5 1.77 0.68 2.14 3 0.0

May 72.5 50.0 61.2 0.69 0.14 0.57 2 0.0

Jun 77.7 53.2 65.4 0.13 0.00 0.11 0 0.0

Jul 81.1 54.8 68.0 0.04 0.00 0.00 0 0.0

Aug 80.9 55.1 68.0 0.06 0.00 0.00 0 0.0

Sep 79.9 54.0 67.0 0.25 0.00 0.15 1 0.0

Oct 74.3 51.0 62.7 1.56 0.36 1.54 2 0.0

Nov 64.1 45.9 55.0 3.92 1.29 4.68 5 0.0

Dec 56.5 41.5 49.0 6.06 2.32 7.18 7 0.0

Annual: 25.35 39.86

Average 69.7 48.6 59.2 - - - - -

Total - - - 32.59 43 0.0

GROWING SEASON DATES

Years with missing data: 24 deg = 18 28 deg = 22 32 deg = 24

Years with no occurrence: 24 deg = 30 28 deg = 22 32 deg = 4

Data years used: 24 deg = 30 28 deg = 26 32 deg = 24

Probability 24 F or higher

28 F or higher

32 F or higher

50 percent * No occurrence

No occurrence

1/6 to 1/7: 366 days

70 percent * No occurrence

No occurrence

12/18 to 1/27:

405 days

* Percent chance of the growing season occurring between the Beginning and

Ending dates.

STATS TABLE - total precipitation (inches)

Yr Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annl

1894 10.79 5.46 0.85 0.98 1.69 1.00 1.61

4.24

0.72 17.06

44.40

1895 18.75 2.70 4.06 0.91 0.88 1.74

M0.15

2.69 3.99 35.87

1896 M19.67 0.11 4.78 M9.25 33.81

1897

1898

1899

1900

1901

1902

1903 M0.00 0.00 T 1.03

9.51 2.42 12.96

1904 1.33 15.38 15.99 1.05 0.00 0.00 0.00 0.00 6. 5. 2.45 4.01 51.

12 08 41

1905 8.61 5.43 6.32 1.18 2.38 0.00 0.00 0.00 23.92

1906

1907

1908

1909

1910

1911

1912

1913

1914

1915

1916

1917

1918

1919

1920

1921

1922

1923

1924

1925

1926

1927

1928

1929

1930

1931

1932

1933

1934

1935

1936

1937

1938

1939

1940

1941

1942

1943

1944

1945

1946

1947 5.78 0.70 0.79 1.21 0.00 0.00 0.00

6.16

1.49 2.11 18.24

1948 3.07 2.31 4.70 7.21 0.54 0.04 T 0.00 0.18

0.69

1.34 7.15 27.23

1949 M0.96 M5.16 9.92 T 0.37 M0.00 0.05 M0.10 0.04

0.09

2.96 4.19 23.84

1950 12.38 8.02 2.01 1.97 M0.54 0.04 0.00 0.00 0.00

4.47

9.63 11.96

51.02

1951 6.97 3.92 2.58 1.82 1.49 0.00 M0.00 T T 1.88

5.75 16.04

40.45

1952 17.37 M3.91 M4.73 1.71 0.52 1.05 0.00 0.00 M0.03

0.02

4.23 19.80

53.37

1953 M8.89 M0.00 5.86 5.07 M0.81 0.22 0.00 0.10 0.00

0.53

4.05 0.51 26.04

1954 8.56 4.80 8.36 4.14 0.00 0.27 0.00 0.27 0.00

0.18

6.14 5.38 38.10

1955 5.28 2.35 0.39 M4.11 0.04 0.00 M0.00 0.00 0.04

0.11

4.72 22.65

39.69

1956 13.21 M9.81 M0.62 M0.01 0.01 0.00 0.14

3.59

0.05 0.17 27.61

1957 6.45 M7.49 4.84 M1.92 5.51 0.01 0.00 0.00 1.62

M7.85

0.87 36.56

1958 M8.28 19.03 8.06 8.27 0.40 0.56 0.02 0.00 0.03

0.08

0.25 2.50 47.48

1959 10.02 8.34 0.70 0.46 0.01 0.00 0.00 0.04 4.45

0.00

0.00 M1.48

25.50

1960 M8.99 8.54 M3.47 1.33 M0.18 0.00 0.00 0.00 0.00

0.55

M3.49

4.70 31.25

1961 4.68 1.89 4.93 1.15 0.16 0.00 M0.00 0.00 0.24

0.60

6.19 4.44 24.28

1962 3.59 15.38 7.00 0.36 0.02 T M0.00 M0.01

10.04

0.86 6.56 43.82

1963 11.60 4.41 6.87 6.16 0.41 0.00 0.00 0.00 0.00

2.52

7.87 0.95 40.79

1964 4.73 0.20 0.10 0.56 0.68 2.28 T 0.03 0.00

3.20

5.83 12.27

29.88

1965 8.93 2.05 2.62 4.64 0.00 0.00 0.02 0.77 0.00

T 7.67 5.79 32.49

1966 10.44 5.53 0.41 0.62 0.21 0.05 0.00 0.11 0.06

0.00

11.09

9.35 37.87

1967 20.28 0.84 8.43 6.46 0.09 2.33 0.00 0.00 0.02

0.44

2.71 5.94 47.54

1968 9.77 5.56 4.06 0.32 0.15 0.00 T 0.32 0.00

3.25

5.10 14.10

42.63

1969 16.49 13.01 1.69 2.45 0.02 T 0.00 0.00 0.09

4.73

1.19 14.24

53.91

1970 19.85 3.53 2.41 0.12 0.06 0.26 0.00 0.00 0.00

2.24

9.72 14.35

52.54

1971 2.29 0.16 2.83 1.18 0.39 0.00 0.00 0.00 0.23

0.04

3.64 6.75 17.51

1972 1.99 1.99 0.59 2.99 0.00 0.22 0.00 0.00 0.68

6.98

9.92 6.29 31.65

1973 16.99 11.07 3.66 0.16 0.00 0.00 0.00 0.00 0.20

3.12

18.69

6.57 60.46

1974 7.51 2.08 9.73 2.49 0.10 0.08 1.56 0.00 0.00

1.54

0.80 3.94 29.83

1975 2.59 14.81 9.98 2.25 0.08 0.01 0.23 0.02 0.00

4.75

0.58 0.72 36.02

1976 0.35 1.45 3.54 1.98 0.00 0.00 0.00 1.02 0.62

0.52

2.97 2.67 15.12

1977 3.30 2.37 2.92 0.31 0.89 0.00 0.00 0.00 2.68

0.61

10.27

7.01 30.36

1978 8.42 6.05 2.75 0.06 0.00 0.00 0.00 1.77

0.00

3.13 0.84 23.02

1979 11.03 9.00 2.92 1.32 1.57 0.00 0.00 0.00 0.03

3.58

5.15 9.85 44.45

1980 10.19 12.30 1.68 M3.23 0.31 0.13 0.06 0.00

0.13

M0.18

4.91 33.12

1981

1982

1983

1984 0.00 0.02 0.00 0.00 M0.09

M1.91

M9.80

2.23 14.05

1985 1.20 2.41 4.39 0.30 0.00 0.00 0.00 0.00 0.00

1.13 M2.34

11.77

1986 8.45 18.93 7.76 1.11 0.20 M0.00 0.00 0.00 M0.93

0.08

0.09 M1.77

39.32

1987 3.84 6.43 4.11 0.37 M0.06 0.00 0.00 0.00 0.00

1.50 9.72 26.03

1988 6.39 0.54 0.00 2.11 0.38 M0.27 0.00 0.00 0.00

0.01

3.04 M4.21

16.95

1989 1.69 1.50 9.24 0.54 0.05 0.40 0.00 1.49

2.26

2.20 0.00 19.37

1990 3.99 2.92 0.81 0.12 2.94 M0.00 0.00 0.00 0. 0. 0.54 1.82 13.

13 13 40

1991 4.67 12.85 0.94 0.09 0.31 0.00 0.29 0.00

1.89

1.22 3.26 25.52

1992 2.63 11.06 5.14 1.43 0.00 0.10 0.00 0.00 0.00

3.85

0.21 11.10

35.52

1993 18.53 8.74 2.07 0.83 1.20 0.65 0.00 0.00 0.00

0.75

4.17 4.17 41.11

1994 3.91 10.75 1.08 1.49 0.00 0.00 0.00 0.00

0.51

11.71

5.29 34.74

1995 24.11 0.98 13.36 3.16 1.54 0.79 0.00 0.00 0.00

0.25

0.08 15.40

59.67

1996 11.88 14.58 2.61 3.75 2.80 0.00 0.00 0.00 0.00

0.80

4.01 13.02

53.45

1997 11.07 0.19 0.76 0.25 0.36 0.25 0.00 1.07 0.14

0.98

10.86

4.25 30.18

1998 11.00 22.69 2.72 2.32 4.57 0.00 0.00 0.00 0.01

0.70

7.10 1.12 52.23

1999 3.70 9.70 4.14 2.63 0.12 0.20 0.00 0.00 0.08

M0.00

M0.00

0.45 21.02

2000 8.13 12.79 1.83 2.41 1.37 0.11 0.00 M0.00 0.11

3.39

1.27 0.66 32.07

2001 M5.37 7.40 1.47 0.18 0.00 0.12 0.00 0.00 0.13

0.64

8.76 14.11

38.18

2002 3.96 1.29 2.12 0.36 0.61 0.00 0.00 0.00 0.00

0.00

M2.18

20.57

31.09

2003 4.15 3.18 2.82 4.47 1.70 0.00 0.01 0.00 0.00

M0.00

M0.87

M8.44

25.64

2004 M4.52 M25.15 M0.57 M0.05 M0.00 M0.00 M0.00 M0.00 M0.00

M0.00

M0.00

M0.00

30.29

2005 M0.00 M5.02 7.22 2.07 3.35 0.53 0.00 0.00 0.00

0.33

2.05 M15.58

36.15

2006 4.97 3.33 11.53 8.09 0.35 0.00 0.00 0.00 0.00

M0.48

M0.00

M0.00

28.75

2007 0.30 7.64 0.20 1.61 0.41 0.00 0.00 0.00 0.03

2.35

0.76 3.56 16.86

2008 14.20 3.18 0.11 0.08 0.01 0.00 0.00 0.00 0.00

1.20

3.70 3.72 26.20

2009 0.56 11.84 M1.77 0.57 1.22 0.01 0.00 0.00 0.31

6.72

0.48 3.82 27.30

2010 12.39 7.39 4.31 4.34 0.98 0.00 0.00 0.00 0.00

2.98

3.77 8.12 44.28

2011 1.87 6.63 10.92 0.19 M0.32 0.74 M0.00 M0.00 M0.00

M0.00

M1.33

M0.00

22.00

2012 M0.00 1.83 10.78 M0.15 0.00 0.02 0.00 0.00 0.00

1.43

7.06 M12.95

34.22

2013 M0.32 M0.17 0.95 0.83 0.02 0.43 0.00 0.00 M0.59

0.00

1.25 0.50 5.06

2014 0.00 9.22 2.77 1.67 0.00 0.00 0.02 0.00 0.34

0.72

2.45 17.17

34.36

2015 0.00 3.74 0.27 M1.63 0.00 0.17 0.04 0.00 0.16

0.02

0.87 4.95 11.85

2016 11.12 0.99 M0.01 M0.80 M0.08 M0.00 M0.00 M0.00 M0.00

6.40

3.94 6.83 30.17

2017 21.26 14.70 4.40 5.16 0.00 0.11 0.00 M0.00 0.02

0.15

3.85 0.02 49.67

2018 M0.99 0.24 8.54 M2.64 12.41

Notes: Data missing in any month have an "M" flag. A

"T" indicates a trace of precipitation.

Data missing for all days in a month or year is blank.

Creation date: 2016-07-22

Appendix C Dominant Plant Species Observed in the Study Area

Appendix C. Wetland Indicator Status for Dominant Plant Species Observed in the Study Area

Scientific Name Common Name Wetland Indicator Statusa

Wild Oats Grassland

Avena fatua Wild oats UPL

Bromus hordeaceus Soft brome FACU

Carduus pycnocephalus Italian thistle UPL

Harding Grass Swards

Phalaris aquatica Harding grass FACU

Coast Live Oak Woodland

Quercus agrifolia Coast Live Oak

Avena fatua Wild oats UPL

Bromus hordeaceus Soft brome FACU

Ornamental

Eucalyptus globulus Blue gum UPL

Schinus molle California pepper tree UPL

Himalayan Blackberry Thickets

Rubus armeniacus Himalayan blackberry FAC

Wetland Types

Pickleweed Mats

Sarcocornia pacifica Pickleweed OBL

Distichlis spicata Saltgrass FAC

Bulboschoenus maritimus Salt marsh bulrush OBL

Salt Marsh Bulrush Marshes

Bulboschoenus maritimus Salt marsh bulrush OBL

Soft Rush Marshes

Juncus effusus Soft rush FACW

Cattail Marshes

Typha latifolia Cattail OBL

Baltic Rush Marshes

Juncus articus var. balticus Baltic rush FACW

Arroyo Willow Thickets

Salix lasiolepis Arroyo willow FACW

Appendix C. Wetland Indicator Status for Dominant Plant Species Observed in the Study Area

Scientific Name Common Name Wetland Indicator Statusa

Sources: U.S. Army Corps of Engineers 1987; Lichvar et al. 2016; Baldwin et al. 2012. a Indicator Status Definitions:

OBL = Obligate, almost always occurs in wetlands (>99% probability of occurrence) FACW = Facultative wetland, usually occurs in wetlands (66%–99% probability) FAC = Facultative, equally likely to occur in wetlands or nonwetlands (34%–66% probability) FACU = Facultative upland, usually occurs in nonwetlands but occasionally in wetlands (1%–33%

probability) UPL = Obligate upland, almost never occurs in wetlands (<1% probability)

Appendix D Routine Wetland Delineation Data Forms

Appendix E Representative Photographs

Photo 1. Looking north at SM-1.

Photo 2. Looking northwest SM-1.

Photo 3. Looking northwest at the south fork of Gallinas Creek at low tide.

Photo 4. Looking north at EM-2.

Photo 5. Looking north at SW-1 and ED-1.

Photo 6. Looking southwest at SW-1.

Photo 7. Looking north at SW-2.


Photo 9. Looking west at EM-3.

Photo 10. Looking north at SM-3, SM-4, and bridge crossing of the north fork of

Gallinas Creek (TD-2).

Photo 11. Looking northwest at SM-2, SM-4, and TD-2.

Photo 12. Looking south at SM-4 and TD-2.

Photo 13. Looking east at SW-9.


Photo 15. Looking south at EM-4.

Photo 16. Looking west at ED-2.

Appendix C Project Site Photographs

Photo 1. Looking north at SM-1.

Photo 2. Looking northwest SM-1.

Photo 3. Looking northwest at the south fork of Gallinas Creek at low tide.

Photo 4. Looking north at EM-2.

Photo 5. Looking north at SW-1 and ED-1.




Photo 9. Looking west at EM-3.

Photo 10. Looking north at SM-3, SM-4, and bridge crossing of the north fork of

Gallinas Creek (TD-2).

Photo 11. Looking northwest at SM-2, SM-4, and TD-2.

Photo 12. Looking south at SM-4 and TD-2.

Photo 13. Looking east at SW-9.


Photo 15. Looking south at EM-4.

Photo 16. Looking west at ED-2.

Appendix D Design Drawings

Documents

Appendix B Preliminary Jurisdictional Delineation · The field delineation was conducted on April 21, May 9, May 17, July 27, and July 28, 2017 and April 4, 2018. A total of 6.548