HomeMy WebLinkAboutRS_Wetland-Stream Reconnaissance Report_260713_v1
March 3, 2026 Bob Wenzl Bob@tuscanywa.com
AOA-8041
SUBJECT: Wetland & Stream Reconnaissance for Cascade Crest 3401 NE 12th Street and 1161 Olympic Ave. NE Parcels 0923059124 and 0923059135, City of Renton
Dear Bob On February 17, 2026 AOA conducted a wetland and stream reconnaissance on and adjacent to the subject property utilizing the methodology outlined in the May 2010
Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0). No wetlands or streams were found on or adjacent to the property.
The western parcel is currently developed with three dilapidated structures and consists primarily of maintained lawn with ornamental vegetation, Douglas fir (Pseudotsuga menziesii), black hawthorn (Crataegus douglasii), and bamboo
(Bambusa sp.). The eastern lot was developed with two single-family residences, one attached shed, maintained lawn, ornamental vegetation, and a gravel parking
area. No definitive hydrophytic plant communities were observed on or adjacent to the subject properties.
Borings throughout the site revealed high chroma non hydric soils. Attachment A contains a data sheet prepared for a representative upland location on the site. This data sheet documents the vegetation, soils, and hydrological information that aided in the no wetland or stream determination during our site review.
Bob Wenzl
March 3, 2026 Page 2 of 2
If you have any questions regarding the reconnaissance, please give me a call.
Sincerely,
ALTMANN OLIVER ASSOCIATES, LLC
John Altmann Ecologist
Attachments
EagleView Technologies, Inc., King County, King County
0 40 80 120 16020US Feet
Subject Properties
King_County_Parcels
Approximate Data Plot Location
Data Plot Map AOA-8041
City of Renton
Parcels: 092305-9124
& 09305-9135
DP#1
US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0
WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region
VEGETATION – Use scientific names of plants
Tree Stratum (Plot size: 10') Absolute % Cover Dominant Species? Indicator Status Dominance Test Worksheet:
1. Crataegus douglasii 50 yes FAC Number of Dominant Species That Are OBL, FACW, or FAC: 2 (A) 2. Rubus armenaicus 10 no FAC
3. Total Number of Dominant Species Across All Strata: 3 (B) 4.
50% = 50, 20% = 20 60 = Total Cover Percent of Dominant Species That Are OBL, FACW, or FAC: 66.7 (A/B) Sapling/Shrub Stratum (Plot size: 10')
1. Prevalence Index worksheet:
2. Total % Cover of: Multiply by:
3. OBL species x1 =
4. FACW species x2 =
5. FAC species x3 =
50% = , 20% = = Total Cover FACU species x4 =
Herb Stratum (Plot size: 10') UPL species x5 =
1. Poa pratensis 80 yes FAC Column Totals: (A) (B)
2. Prevalence Index = B/A =
3. Hydrophytic Vegetation Indicators:
4. 1 – Rapid Test for Hydrophytic Vegetation
5. 2 - Dominance Test is >50%
6. 3 - Prevalence Index is <3.01
7. 4 - Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet) 8.
9. 5 - Wetland Non-Vascular Plants1
10. Problematic Hydrophytic Vegetation1 (Explain)
11. 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. 50% = 40, 20% = 16 80 = Total Cover
Woody Vine Stratum (Plot size: 10')
1. Hedera helix 20 yes FACU
Hydrophytic
Vegetation
Present?
Yes No 2.
50% = 10, 20% = 4 20 = Total Cover
% Bare Ground in Herb Stratum
Remarks:
Project Site: Parcels: 0923059124, 093059135 City/County: Renton/ Sampling Date: 2-17-26
Applicant/Owner: Wenzl State: WA Sampling Point: DP#1
Investigator(s): Jason Panzera Section, Township, Range: S9, T23N, R5E
Landform (hillslope, terrace, etc.): Slope Local relief (concave, convex, none): concave Slope (%):
Subregion (LRR): A Lat: 47.502766 Long: -122.173584 Datum:
Soil Map Unit Name: AmC NWI classification: N/A
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 Is the Sampled Area within a Wetland? Yes No Hydric Soil Present? Yes No
Wetland Hydrology Present? Yes No
Remarks:
Upland plot, see map
US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0
SOIL Sampling Point: DP#1
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches) Color (moist) % Color (moist) % Type1 Loc2 Texture Remarks
0-16 10 YR 3/2 100 sandy gravel loam
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)
3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic.
Thick Dark Surface (A12) Redox Dark Surface (F6)
Sandy Mucky Mineral (S1) Depleted Dark Surface (F7)
Sandy Gleyed Matrix (S4) Redox Depressions (F8)
Restrictive Layer (if present):
Hydric Soils Present? Yes No
Type:
Depth (inches):
Remarks: No redoximorphic features
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) Water-Stained Leaves (B9)
High Water Table (A2) (except MLRA 1, 2, 4A, and 4B) (MLRA 1, 2, 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 Stresses 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): Wetland Hydrology Present?
Yes
No
Water Table Present? Yes No Depth (inches):
Saturation Present? (includes capillary fringe) Yes No Depth (inches):
Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks: Dry
Project Site: Parcels: 0923059124, 093059135