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Page 1 of 4 O’Bunco Engineering Intl. Inc.
1042 W James St Suite 103, Kent, WA 98032; P (425) 451-7300
Branch Offices: Pasco WA
PROJECT NARRATIVE
PRELIMINARY PLAT OF AMY LAY
Prepared by:
O’Bunco Engineering Consulting Engineers,
Inc. May 29, 2024
PARCEL RECORD: Table 1
Parcel # 3342700405
Address 3901 Park Ave N. Renton, WA 98056
Gross Area 41,770 sf (0.95 ac)
Lot Size for the proposed four lots Lot 1: 12974 sf (0.29 ac); Lot 2: 9513 sf (0.21 ac);
Lot 3: 9563 sf (0.21 ac); Lot 4: 9599 sf (0.22 ac)
Zoning R-6
Comprehensive Plan Residential Medium Density (MD)?
Water District City of Renton
School District Renton #403
Fire District City of Renton
Sewer District City of Renton
PROPERTY DESCRIPTION
The existing parcel consists of one lot with a house bordering Park Ave N to the East and to
Wells Ave N to the North. The site totals 0.95 acres and has one single family residence with a
detached garage that are to be retained as well as a concrete driveway that is to be retained.
Access to the existing building is from Park Ave N. The rest of the site is bounded by single
family residence parcels.
PROJECT DESCRIPTION
The proposed short plat will subdivide the current parcel into a total of 4 single family residential
lots. The first retaining the existing structures bordering Park Ave N, (Lot 1) and the 3 remaining
parcels (Lots 2, 3 & 4) are to be created to the West of the house and to be accessed through
Wells Ave N.
Page 4 of 4 O’Bunco Engineering Intl. Inc.
1042 W James St Suite 103, Kent, WA 98032; P (425) 451-7300
Branch Offices: Pasco WA
ZONING ANALYSIS
The site is located in the City of Renton with a zoning designation of R-6 which allows a
maximum of 6 dwelling units per acre. The proposed 4-lot layout meets the density and setback
requirements by the City of Renton. The following are site requirement for new development.
The project will be designed to comply with all these requirements below:
Site Requirements: Table 2
Requirement Requirement Proposed
Average Lot Size: 7000 SQ ft 10412.25 SQ ft
Minimum Lot Width: 60 ft TBD
Minimum Street Setback: 25 ft 25 ft
Side/Interior Setback: Combined 15 ft. With not less
than 5 ft on either side.
Combined 15 ft. With not less
than 5 ft on either side.
Rear Setback: 25 ft 25 ft
Minimum Building Separation
Maximum Lot Coverage
(for structures):
40%
Maximum Impervious Surface
Area:
55% 55% impervious & 45%
pervious
Base Height of Structures: TBD & will comply with City
of Renton STD
Maximum Density 6 dwelling units 4 dwelling units (include
existing)
CRITICAL AREAS
The site does not border or contain critical areas.
Page 3 of 4 O’Bunco Engineering Intl. Inc.
1042 W James St Suite 103, Kent, WA 98032; P (425) 451-7300
Branch Offices: Pasco WA
STORMWATER
Elevation ranges from approximately 124 ft on the Southeastern corner of the existing parcel
bordering Park Ave N. to 85 ft in the Northwestern corner of the existing parcel. Since the lot is
less than 22,000 sf, use of small BMP’s will to include drywell will explored.
Existing soil type is of the hydrologic group category A, consisting entirely of Indianola Loamy
Sand per NCRS web soil survey.
Geotechnical report is pending.
UTILITIES
The four lots will be served the utilities districts as indicated in Table 1 above.
ACCESS AND ROADS
Access to the existing structures is to remain from Park Ave N (Lot 1). Dead-end Access to the
proposed lots of Lot 2, 3 & 4 will be through Wells Ave N. There are no viable opportunity
exists for future road connection to the South of Wells Ave N because of existing housing
development to the south.
EARTHWORK
Estimated quantities for cut and fill are to be determined.
SITE IMPROVEMENTS
Proposed street connection on Wells Ave N will connect the existing sidewalk and frontage
improvement in accordance the City Renton Roadway Standard. There is an exiting fire hydrant
located next to the property line proposed for driveway access for the three lots.
To be determined if land is to be dedicated to the city.
TREES
One significant tree exists on the current parcel. It is located in the proposed Lot 1. The tree is to
remain undisturbed and preserved.
Page 4 of 4 O’Bunco Engineering Intl. Inc.
1042 W James St Suite 103, Kent, WA 98032; P (425) 451-7300
Branch Offices: Pasco WA
COST ESTIMATE
Total estimated construction cost and estimated fair market value of the proposed project is to be
determined.