HomeMy WebLinkAboutRP_Wetland Assessment Tech Memo_241112_v1 Soundview Consultants LLC
Environmental Assessment • Planning • Land Use Solutions
2907 Harborview Dr., Suite D, Gig Harbor, WA 98335
Phone: (253) 514-8952 Fax: (253) 514-8954
2452.0001 SE 128th Street 1 Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
To: Don and Julie Strohschein, 2001 Strohschein LLC File Number: 2452.0001
From: Matt DeCaro, Soundview Consultants LLC
Ryan Krapp, Soundview Consultants LLC Date: September 1, 2022
Re: Wetland Assessment Findings
15815 SE 128th Street, Renton, Washington 98059
Dear Don and Julie,
Soundview Consultants LLC (SVC) conducted a wetland assessment on the property located at 15815
SE 128th Street in the City of Renton, Washington (Figure 1) on August 9, 2022. The property consists
of three parcels situated in the Northeast ¼ of Section 14, Township 23 North, Range 5 East (King
County Tax Parcel Numbers 3664500007, 3664500008, and 3664500009). SVC investigated the site
to evaluate whether any potentially regulated wetlands are located on or adjacent to the subject
property.
Figure 1. Subject Property Location.
Technical Memorandum
2452.0001 SE 128th Street 2 Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Background Data
Prior to the site investigation, SVC staff conducted background research using the City of Renton and
King County Geographic Information System (GIS) data, Washington Department of Fish and
Wildlife (WDFW) Priority Habitat and Species (PHS) mapping tools, U.S. Fish and Wildlife Service
(USFWS) National Wetland Inventory (NWI), and Natural Resource Conservation Service (NRCS)
soil survey (Attachment B). All determinations were made using observable vegetation, hydrology, and
soils in conjunction with data from the King County topographic maps, USFWS, local precipitation
data, and various ortho-photographic resources.
No wetlands are mapped on the subject property by any of the critical area inventories, including the
City of Renton Sensitive Areas Map (Attachment B1), King County iMap (Attachment B2), USFWS
NWI (Attachment B3), or WDFW PHS database (Attachment B4).
The NRCS soil map (Attachment B5) identifies one soil series on the subject property: Alderwood
gravelly sandy loam, 8 to 15 percent slopes. The King County Hydric Soils List identifies Alderwood
gravelly sandy loam, 8 to 15 percent slopes, as a non-hydric soil, containing up to 5 percent hydric
inclusions of Shalcar and Norma in depressions and drainageways (NRCS, 2022).
Precipitation
Precipitation data was obtained from the National Oceanic and Atmospheric Administration (NOAA)
Seattle-Tacoma International Airport station to obtain percent of normal precipitation during and
preceding the investigations. A summary of data collected is provided in Table 1.
Table 1. Precipitation Summary1
Date Day Of Day
Before
1 Week
Prior
2 Weeks
Prior
30 Days Prior
(Observed/Normal)
Year to Date
(Observed/Normal)2
Percent of
Normal3
08/09/2022 Trace 0.00 0.00 0.00 0.00/0.48 32.03/26.65 0/120
Notes:
1. Precipitation volume provided in inches. Data obtained from NOAA (http://w2.weather.gov/climate/xmacis.php?wfo=sew) for Seattle-
Tacoma Airport, WA.
2. Year-to-date precipitation is for the calendar year from January 1 to the onsite date for August 9 visit.
3. Percent of normal is shown for the last 30 days and year to date data.
Precipitation levels during the August 2022 site investigation were dry for the prior 30 days (0.00
inches of precipitation) and within the statistical normal range for the 2022 calendar year (120 percent
of normal). Low precipitation levels are typical for the dry summer months, and the normality of
precipitation for the calendar year suggests that hydrologic conditions were normal at the time of the
site visit, which was completed in August when precipitation and groundwater levels re typically low.
Such conditions were taken into consideration in making wetland determinations.
Methods
A formal site investigation was performed by qualified SVC staff in August 2022. The site
investigation consisted of walk-through surveys of the subject property and any accessible areas within
300 feet of the subject property for potentially regulated wetlands and waterbodies as specified in
Renton Municipal Code (RMC) Section 4-3-050 (Critical Areas Regulations). During the investigation,
SVC staff was accompanied by a septic professional, Mr. Pete Couty with Alberta Septic Systems.
2452.0001 SE 128th Street 3 Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Wetlands are regulated features per RMC Section 4-3-050 and subject to restricted uses/activities
under the same title. Wetland presence or absence was determined in general accordance with RMC
4-3-050F(2)(e) and as outlined in the U.S. Army Corps of Engineers’ (USACE) Wetlands Delineation
Manual (Environmental Laboratory, 1987) as modified according to the guidelines established in the
Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and
Coast Region, Version 2.0 (USACE, 2010) and Field Indicators of Hydric Soils in the United States (USDA,
2018). Pink surveyor’s flagging was labeled alpha-numerically and tied to 3-foot lath stakes or nearby
vegetation at formal sampling locations (DP-1 to DP-3) to mark the points where detailed data was
collected.
Results
The subject property consists of three tax parcels, totaling 3.0 acres in size. One farmhouse with
associated infrastructure is located on the northern end of the subject property that appears to have
been abandoned approximately 2 years ago. Crushed concrete and gravel have been spread around
and compacted on the property to facilitate outdoor storage. Residential uses and public streets
surround the site with a church located offsite to the east.
The septic tank for the abandoned farmhouse is located south of the home, and the drainfield lines
were located by a septic professional to the north of the home, running perpendicular across the
slope. This septic drainfield was likely active for at least 50 years, releasing nutrients and hydrology
down and into the soils of an ephemeral drainage swale that is present to the north of the drainfield.
This grassy swale also receives storm water runoff from the surrounding compacted gravel surfaces
and conveys excessive hydrology downslope to the northeast on an approximately 3 to 5 percent grade
through a narrow ditch (see exhibit in Attachment A) that is cut through the raised gravel roadbed.
This grassy area containing the artificially constructed drainage area has been maintained as a mowed
lawn for decades.
Three representative data plots were collected on the subject property to document the lack of
wetlands on the subject property. Data sheets are provided in Attachment C. Data plots DP-1 and
DP-2 were collected within the grassy swale downslope of the septic system described above. No
hydric soil indicators were identified at either of these representative data plot locations.
Redoximorphic features and depleted matrices are present at DP-1 and/or DP-2; however, the
redoximorphic features are not present in sufficient concentrations or at shallow enough depths in
the soil profile to meet any hydric soil indicator, while the depleted layer at DP-1 is too deep to meet
any hydric soil indicator. Therefore, while movement of water through the swale has altered soil
conditions, no hydric soils are present within the swale.
The septic professional used a probe and discovered a hard pan soil layer at approximately 30 inches
below ground surface, with loose, well-draining soils between the hard pan layer and the soil surface.
This soil profile, coupled with the added compacted gravel surfaces upslope of the swale and the
historical additional inputs from the septic drainfield, have directed excessive hydrology (and
nutrients) through this swale during the wet winter months. However, our observations suggest that
the water quickly drains, failing to provide hydrologic conditions necessary for a wetland to form.
Hydrophytic vegetation is present due to the dominant species observed being facultative grass and
forb species. However, no primary indicators of hydrology were observed and only one secondary
indicator of hydrology (geomorphic position) is present. The area does not meet the vegetative FAC
2452.0001 SE 128th Street 4 Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Neutral test, a secondary indicator of wetland hydrology, due to a preponderance of dominant
facultative and non-dominant facultative upland plant species. Active mole mounds are present in the
entire swale which, while not a formal upland indicator, suggest the area does not normally exhibit
wetland hydrology conditions. Photographs of the data plots and general site conditions from the
August 2022 investigation are included in Attachment D.
Conclusions
No wetlands are present onsite. The grassy swale area north of the existing farmhouse does not meet
wetland hydrology or hydric soil indicators necessary to be considered a wetland. Therefore, future
redevelopment of the subject property should be unencumbered by any wetlands or associated
protective buffers.
If you have any questions, please feel contact us at your convenience at (253) 514-8952.
Sincerely,
____________________________ September 1, 2022
Matt DeCaro Date
Associate Principal
____________________________ September 1, 2022
Ryan Krapp Date
Environmental Scientist
2452.0001 SE 128th Street 5 Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
References
Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-
1, US Army Engineer Waterways Experiment Station, Vicksburg, Mississippi.
Hitchcock, C.L. and A. Cronquist. 2018. Flora of the Pacific Northwest: An Illustrated Manual, 2nd Edition.
University of Washington Press. Seattle, Washington.
Munsell Color. 2000. Munsell Soil Color Charts. New Windsor, New York.
Natural Resources Conservation Services (NRCS). 2022. Soil Data Access Hydric Soils List (Soil Data
Access Live). Website:
https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcseprd1316620.html.
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.
Renton Municipal Code. 2022. Section 4-3-050 Critical Areas Regulations. Website:
https://www.codepublishing.com/WA/Renton/#!/Renton04/Renton0403/Renton0403050.h
tml#4-3-050. Current through June 13, 2022.
Snyder, Dale E., Philip S. Gale, Russell F. Pringle. 1973. Soil Survey of King County Area, Washington.
United States Department of Agriculture, Soil Conservation Service, in cooperation with the
Washington Agricultural Experiment Station.
United States Army Corps of Engineers (USACE). 2010. Regional Supplement to the Corps of Engineers
Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Ver2.0), ed. J.S. Wakeley,
R.W. Lichvar, and C.V. Noble. ERDC/EL TR-10-3. U.S. Army Engineer Research and
Development Center. Vicksburg, Mississippi.
United States Army Corps of Engineers (USACE). 2020. National Wetland Plant List, version 3.5.
http://wetland-plants.usace.army.mil/.
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment A – Existing Conditions
DP-3
DP-2
DP-1
Esri, HERE, Garmin, (c) OpenStreetMap contributors, and the GIS usercommunity, EagleView Technologies, Inc.
15815 SE 128TH STREETRENTON, WA 98059 KING COUNTY PARCEL NUMBERS:3664500007, 3664500008, & 3664500009
SE 128th Street
EXISTING CONDITIONS
¢
PRELIMINARYINFORMATION ONLYNOT FOR CONSTRUCTIONSOUNDVIEW CONSULTANTS LLC ASSUMESNO LIABILITY OR RESPONSIBILITY FORCONSTRUCTION, IMPROVEMENTS, ORESTIMATES BASED ON THIS PLAN SET
DATE:
JOB:
BY:
SCALE:
FIGURE NO.
8/25/2022
2452.0001
RK
1
0 90 18045 Feet
1 " = 90 '
www.soundviewconsultants.com
2907 Harborview Dr., Suite D, Gig Harbor, WA 98335Phone: (253) 514-8952 Fax: (253) 514-8954
Soundview ConsultantsEnvironmental Assessment • Planning • Land Use Solutions LLC
'&Data Point
"Existing Septic Tank
Existing Septic Drainfield
! ! ! ! ! ! ! !Ditch
Site Boundary
Aerial Imagery: King Co - 2021
SE 128th St
15
8
t
h
A
v
e
S
E
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment B – Background Information
This attachment includes the following:
• City of Renton Sensitive Areas Map (B1);
• King County iMap (B2);
• USFWS NWI Map (B3);
• WDFW PHS Map (B4); and
• NRCS Soil Survey Map (B7).
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment B1 – City of Renton Sensitive Areas Map
Approximate
Subject Property
Location
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment B2 – King County iMap
Subject Property
Location
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment B3 – USFWS NWI Map
Subject Property
Location
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment B4 – WDFW PHS Map
Subject Property
Location
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment B5 – NRCS Soil Survey Map
Subject Property
Location
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment C – Non-Wetland Data Forms
US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0
WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast 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.
Absolute Dominant Indicator Tree Stratum (Plot size: 30 ft) % Cover Species? Status
1.
2.
3.
4.
= Total Cover Sapling/Shrub Stratum (Plot size: 30 ft)
1.
2.
3.
4.
5.
= Total Cover Herb Stratum (Plot size: 10 ft)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
= Total Cover Woody Vine Stratum (Plot size: 30 ft)
1.
2.
= Total Cover % Bare Ground in Herb Stratum
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:
Rapid Test for Hydrophytic Vegetation
Dominance Test is >50%
Prevalence Index is ≤3.01
Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet)
Wetland Non-Vascular Plants1
Problematic Hydrophytic Vegetation1 (Explain)
1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.
Hydrophytic
Vegetation
Present? Yes No
Remarks:
2452.0001 / SE 128th St Renton / King 8/9/2022
Don & Julie Strohschein WA DP-1
Ryan Krapp 14, 23N, 5E
Swale Concave 2
A2 47.487891 -122.12904445 WGS 84
Alderwood gravelly sandy loam, 8 to 15 percent slopes None
Not all three wetland criteria met; only hydrophytic vegetation indicator met. Data collected at bottom of swale in the northeast
portion of the subject property, downgradient of the septic drainfield.
2
2
0 100%
0
Holcus lanatus 40 Yes FAC
Agrostis capillaris 30 Yes FAC
Ranunculus repens 15 No FAC
Taraxacum officinale 10 No FACU
Prunella vulgaris 5 No FACU
Hypochaeris radicata 1 No FACU
101
0
-1
Hydrophytic vegetation criteria met only due to dominant grass species in a manicured lawn.
US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0
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) 2 cm Muck (A10) Histic Epipedon (A2) Stripped Matrix (S6) Red Parent Material (TF2) Black Histic (A3) Loamy Mucky Mineral (F1) (except MLRA 1) Very Shallow Dark Surface (TF12) Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Other (Explain in Remarks) Depleted Below Dark Surface (A11) Depleted Matrix (F3) Thick Dark Surface (A12) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) wetland hydrology must be present, Sandy Gleyed Matrix (S4) Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:________________________________
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) Water-Stained Leaves (B9) (except MLRA Water-Stained Leaves (B9) (MLRA 1, 2, High Water Table (A2) 1, 2, 4A, and 4B) 4A, and 4B) Saturation (A3) Salt Crust (B11) Drainage Patterns (B10) Water Marks (B1) Aquatic Invertebrates (B13) Dry-Season Water Table (C2) Sediment Deposits (B2) Hydrogen Sulfide Odor (C1) Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) Geomorphic Position (D2) Algal Mat or Crust (B4) Presence of Reduced Iron (C4) Shallow Aquitard (D3) Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) FAC-Neutral Test (D5) Surface Soil Cracks (B6) Stunted or Stressed Plants (D1) (LRR A) Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7) Other (Explain in Remarks) Frost-Heave Hummocks (D7) Sparsely Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No Depth (inches):
Water Table Present? Yes No Depth (inches):
Saturation Present? Yes No Depth (inches): (includes capillary fringe) Wetland Hydrology Present? Yes No
Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
DP-1
0 - 4 10YR 3/2 100 ----SiLo Silty loam
4 - 10 10YR 3/2 97 7.5YR 4/4 3 C M SiLo Silty loam w/ cobble
10 - 13 10YR 3/2 95 7.5YR 4/4 5 C M GrLo Gravelly loam
13 - 16+10YR 4/2 95 7.5YR 4/4 5 C M GrClLo Gravelly clay loam
Hard pan
30"
Hydric soil indicators not present. Redox concentrations in the 4"-10" layer are less than 5% and do not meet for F6. The
redox concentrations in the 10"-13" layer are too deep (>8 inches) to meet for F6. The depleted matrix in the 13-16"
layer is too deep to meet for F3 or A11 and the layers above the depleted matrix are too light (> 2.5/1) to meet for A12.
None
None
None
No wetland hydrology criteria met. Only one secondary indicator present (D2 - geomorphic position). D5 - FAC Neutral
Test not met based on observations (all dominant vegetation is FAC; remaining non-dominant vegetation consists of 3
FACU species, 1 FAC species, and no FACW species.)
US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0
WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast 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.
Absolute Dominant Indicator Tree Stratum (Plot size: 30 ft) % Cover Species? Status
1.
2.
3.
4.
= Total Cover Sapling/Shrub Stratum (Plot size: 30 ft)
1.
2.
3.
4.
5.
= Total Cover Herb Stratum (Plot size: 10 ft)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
= Total Cover Woody Vine Stratum (Plot size: 30 ft)
1.
2.
= Total Cover % Bare Ground in Herb Stratum
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:
Rapid Test for Hydrophytic Vegetation
Dominance Test is >50%
Prevalence Index is ≤3.01
Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet)
Wetland Non-Vascular Plants1
Problematic Hydrophytic Vegetation1 (Explain)
1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.
Hydrophytic
Vegetation
Present? Yes No
Remarks:
2452.0001 / SE 128th St Renton / King 8/9/2022
Don & Julie Strohschein WA DP-2
Ryan Krapp 14, 23N, 5E
hillslope Convex 2-3
A2 47.486970 -122.12914666 WGS 84
Alderwood gravelly sandy loam, 8 to 15 percent slopes None
Not all three wetland criteria met; only hydrophytic vegetation indicator met. Data collected at head of swale in the northeast portion
of the subject property, downgradient of the septic drainfield.
3
3
0 100%
0
Holcus lanatus 45 Yes FAC
Agrostis capillaris 25 Yes FAC
Ranunculus repens 20 Yes FAC
Taraxacum officinale 7 No FACU
Hypochaeris radicata 2 No FACU
Rumex crispus 1 No FAC
100
0
0
Hydrophytic vegetation criteria met only due to dominant grass species in manicured lawn.
US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0
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) 2 cm Muck (A10) Histic Epipedon (A2) Stripped Matrix (S6) Red Parent Material (TF2) Black Histic (A3) Loamy Mucky Mineral (F1) (except MLRA 1) Very Shallow Dark Surface (TF12) Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Other (Explain in Remarks) Depleted Below Dark Surface (A11) Depleted Matrix (F3) Thick Dark Surface (A12) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) wetland hydrology must be present, Sandy Gleyed Matrix (S4) Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:________________________________
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) Water-Stained Leaves (B9) (except MLRA Water-Stained Leaves (B9) (MLRA 1, 2, High Water Table (A2) 1, 2, 4A, and 4B) 4A, and 4B) Saturation (A3) Salt Crust (B11) Drainage Patterns (B10) Water Marks (B1) Aquatic Invertebrates (B13) Dry-Season Water Table (C2) Sediment Deposits (B2) Hydrogen Sulfide Odor (C1) Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) Geomorphic Position (D2) Algal Mat or Crust (B4) Presence of Reduced Iron (C4) Shallow Aquitard (D3) Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) FAC-Neutral Test (D5) Surface Soil Cracks (B6) Stunted or Stressed Plants (D1) (LRR A) Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7) Other (Explain in Remarks) Frost-Heave Hummocks (D7) Sparsely Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No Depth (inches):
Water Table Present? Yes No Depth (inches):
Saturation Present? Yes No Depth (inches): (includes capillary fringe) Wetland Hydrology Present? Yes No
Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
DP-2
0 - 5 10YR 3/2 100 ----SiLo Silty loam
5 - 14 10YR 3/2 99 7.5YR 4/3 1 C M SiGrLo Silty gravelly loam
14 - 18+10YR 4/3 95 7.5YR 4/4 5 C M GrLo Gravelly loam
Hard pan
30"
Hydric soil indicators not present. Redox concentrations in the 5-14" layer are less than 5% and do not meet for F6.
14-18+" layer is too bright (chroma > 2) to qualify as a depleted matrix. In addition, the 14-18+" layer is too deep to be
considered for A11 or F3.
None
None
None
No wetland hydrology criteria met. Only one secondary indicator present (D2 - geomorphic position). D5 - FAC Neutral
Test not met based on observations (all dominant vegetation FAC; remaining non-dominant vegetation consists of 2
FACU species, 1 FAC species, and no FACW species.)
US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0
WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast 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.
Absolute Dominant Indicator Tree Stratum (Plot size: 30 ft) % Cover Species? Status
1.
2.
3.
4.
= Total Cover Sapling/Shrub Stratum (Plot size: 30 ft)
1.
2.
3.
4.
5.
= Total Cover Herb Stratum (Plot size: 10 ft)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
= Total Cover Woody Vine Stratum (Plot size: 30 ft)
1.
2.
= Total Cover % Bare Ground in Herb Stratum
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:
Rapid Test for Hydrophytic Vegetation
Dominance Test is >50%
Prevalence Index is ≤3.01
Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet)
Wetland Non-Vascular Plants1
Problematic Hydrophytic Vegetation1 (Explain)
1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.
Hydrophytic
Vegetation
Present? Yes No
Remarks:
2452.0001 / SE 128th St Renton / King 8/9/2022
Don & Julie Strohschein WA DP-3
Ryan Krapp 14, 23N, 5E
hillslope Convex 2-3
A2 47.486970 -122.12914666 WGS 84
Alderwood gravelly sandy loam, 8 to 15 percent slopes None
No wetland criteria met. Data collected in vacant compacted gravel lot in the central portion of the subject property.
1
3
0 33%
Populus balsamifera 5 Yes FAC
5
Trifolium pratense 20 Yes FACU
Plantago lanceolata 15 Yes FACU
Plantago major 10 No FAC
Taraxacum officinale 5 No FACU
Hypochaeris radicata 5 No FACU
Hypericum perforatum 3 No FAC
58
0
42
Hydrophytic vegetation criteria not met.
US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0
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) 2 cm Muck (A10) Histic Epipedon (A2) Stripped Matrix (S6) Red Parent Material (TF2) Black Histic (A3) Loamy Mucky Mineral (F1) (except MLRA 1) Very Shallow Dark Surface (TF12) Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Other (Explain in Remarks) Depleted Below Dark Surface (A11) Depleted Matrix (F3) Thick Dark Surface (A12) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) wetland hydrology must be present, Sandy Gleyed Matrix (S4) Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:________________________________
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) Water-Stained Leaves (B9) (except MLRA Water-Stained Leaves (B9) (MLRA 1, 2, High Water Table (A2) 1, 2, 4A, and 4B) 4A, and 4B) Saturation (A3) Salt Crust (B11) Drainage Patterns (B10) Water Marks (B1) Aquatic Invertebrates (B13) Dry-Season Water Table (C2) Sediment Deposits (B2) Hydrogen Sulfide Odor (C1) Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) Geomorphic Position (D2) Algal Mat or Crust (B4) Presence of Reduced Iron (C4) Shallow Aquitard (D3) Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) FAC-Neutral Test (D5) Surface Soil Cracks (B6) Stunted or Stressed Plants (D1) (LRR A) Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7) Other (Explain in Remarks) Frost-Heave Hummocks (D7) Sparsely Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No Depth (inches):
Water Table Present? Yes No Depth (inches):
Saturation Present? Yes No Depth (inches): (includes capillary fringe) Wetland Hydrology Present? Yes No
Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
DP-3
0 - 3 ------Gr Compacted gravel
Compacted gravel
3"
Hydric soil indicators not present. Upland topsoil removed and gravel placed/compacted for storage lot.
None
None
None
No wetland hydrology criteria met.
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment D – Site Photographs
Current Site Conditions
Current Site Conditions
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
DP-1 Soil Profile
DP-1 Soil Pit
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
DP-1 Vicinity
DP-1 Vicinity
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
DP-2 Soil Profile
DP-2 Soil Pit
DP-2 Vicinity
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
DP-2 Vicinity
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
DP-3 Soil
DP-3 Vicinity
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
DP-3 Vicinity
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
Attachment E — Qualifications
All field inspections, jurisdictional wetland determinations, and supporting documentation, including
this Wetland Assessment Findings Technical Memorandum prepared for 2001 Strohschein
LLC, were prepared by, or under the direction of, Matt DeCaro of SVC. In addition, site inspections
were performed Ryan Krapp and report preparation was completed Ryan Krapp and Alex Murphy.
Matt DeCaro
Associate Principal
Professional Experience: 13 years
Matt DeCaro is an Associate Principal and Senior Scientist with a diverse background in
environmental planning, wetland science, stream ecology, water quality, tree assessments, site
remediation, NEPA compliance, and project management. He manages a wide range of industrial,
commercial, and multi-family residential projects throughout Western Washington, providing
environmental permitting and regulatory compliance assistance for land use projects from their
planning stages through entitlement and construction. His local expertise, diverse professional
background, and positive relationships with regulatory personnel are integral components of his
successful project outcomes.
Matt earned a Bachelor of Science degree with a focus in Environmental Science from the Evergreen
State College in Olympia, Washington, with additional graduate-level coursework and research in
aquatic restoration and salmonid ecology. Matt has received 40-hour wetland delineation training
(Western Mountains, Valleys, & Coast and Arid West Regional Supplements) and regularly performs wetland,
stream, and shoreline delineations. Matt has been formally trained in the use of the 2014 Washington
State Wetland Rating System and Determination of Ordinary High Water Mark by WSDOE, and he is a Pierce
County Qualified Wetland Specialist and Wildlife Biologist. He has attended USFWS survey
workshops for multiple threatened and endangered species, and he is a Senior Author of WSDOT
Biological Assessments. Matt holds 40-hour HAZWOPER training and has managed Phase I
Environmental Site Assessments, subsurface investigations, and contaminant remediation projects
throughout the Pacific Northwest. His diverse experience also includes NEPA compliance for federal
permitting projects; noxious weed abatement; army ant research in the Costa Rican tropical rainforest;
spotted owl surveys on federal and private lands; and salmonid spawning and migration surveys.
Ryan Krapp
Environmental Scientist / Field Lead
Professional Experience: 10+ years
Ryan Krapp is an Environmental Scientist and Field Lead with a background in conducting wetland
delineations, habitat assessments, botanical surveys, avian surveys, threatened & endangered species
surveys, and fisheries studies. He has considerable experience in production of Environmental
Assessments and Biological Assessments and Evaluations under NEPA guidelines for projects
regulated by the U.S. Forest Service, U.S. Army Corps of Engineers, and Bureau of Indian Affairs as
well as leading Section 7 ESA consultation with the U.S. Fish and Wildlife Service. Project planning,
permitting, and compliance are all part of his professional experiences and practices at SVC.
Ryan has managed environmental investigation projects including wetlands, streams, and critical
2452.0001 SE 128th Street Soundview Consultants LLC
Wetland Assessment Technical Memorandum September 1, 2022
habitats data collection on large pipeline corridors, overhead electrical transmission corridors, and
oil/natural gas drilling development. He has extensive experience in utilizing GIS to collect, manage,
and analyze large volumes of spatial and temporal field data to aide in project management,
monitoring, analysis, and mapping. In addition, he is a FAA trained recreational pilot and a PADI
certified SCUBA diver with fresh and saltwater diving experience. Ryan is a USFWS-approved
Mazama pocket gopher survey biologist.
Alex Murphy, AICP
Planner & Project Manager
Professional Experience: 7 years
Alex Murphy is a Planner and Project Manager with a background in land use planning, site planning
& design, permitting, and project management. He has over 7 years of experience working for local
jurisdictions in the Intermountain West and Pacific Northwest with an emphasis on maximizing
opportunities for culturally and environmentally sensitive projects.
Alex earned a Bachelor of Landscape Architecture degree from Utah State University. He is a Certified
Planner through the American Institute of Certified Planners and has received formal training in
climate adaptation planning for coastal communities from NOAA. Mr. Murphy currently assists in
wetland, stream, and shoreline delineations and fish and wildlife habitat assessments; conducts
environmental code analysis; and prepares environmental assessment and mitigation reports. He also
manages development projects, supporting clients through the regulatory and planning process for
various land use proposals.