HomeMy WebLinkAboutApplication APPLICANT 8/10/2021City of Springfield
Development & Public Works
225 Fifth Street
Springfield, OR 97477
Site Plan Review
SPRINGFIELD
W 6
Application Type (Applicant. check
Site Plan Review Pre -Submittal: ® Major Site Plan Modification Pre -Submittal,
❑
Site Plan Review Submittal: ❑ Ma'or Site Plan Modification Submittal:
Required Project Information (Applicant. complete this section)
Applicant Name: Bruce Wiechert Phone: 541-686-9458
❑
Company: Bruce Wechert Custom Homes, Inc.
Email:`"echenh=esgoxnead.nd
Address: 3073 Skyview Ln., Eugene, OR 97405
Applicant's Re .:Anthony J. Favreau
Phone: 541-683-7048
Com an :The Favreau Group, LLC
Email: favreaugroup@msn.com
Address: 3750 Norwich Ave., Eugene, OR 97408
Property Owner: Same as applicant
Phone:
Company:
Email:
Address:
ASSESSOR'S MAP NO: 18-20-05-23
TAX LOT NO(S): 00204
Property Address:
049 Acres ❑
Size of Property: 32 Square FeetDwelihno
Proposed No. of 20
Proposed Name of Project: Horace Apartment
Description of If you are filling in this form by hand, please attach your proposal description to this application.
Proposal: 20 Unit Apartment complex
Existing Use:vacant
New Impervious Surface Coverage (Including Bldg. Gross Floor Area): 18,204
sf
Si natures: Please sign and Drint Mour name and date in the acicirociriate
Required Project Information (City Intake Staff.,
Associated Applications:
box on the next
complete this section)
Signs:
a e.
Pre -Sub Case No.:
Date:
Reviewed by:
Case No.:
Date:
Reviewed by:
Application Fee: $
Technical Fee: $
Posta a Fee: $
TOTAL FEES: $
1 PROJECT NUMBER:
Revised 1/7/14 Id 1 of 11
Owner Signatures
This application form Is used for both the required pre -submittal meeting and subsequent
complete application submittal. Owner signatures are required at both stages in the application
process.
An application without the Owner's original signature will not be accepted.
The undersigned acknowledges that the Information In this application is correct and
accurate for scheduling of the Pre- Submittal Meeting. If the applicant is not the
owner, the owner hereby grants permission for the applicant to act in his/her behalf.
I/we do hereby acknowledge that I/we are legally responsible for all statutory
timelines, information, requests and requirements conveyed to my representative.
Date:
Signature
1 represent [his application to be complete for submiRal to the City. Consistent with the completeness check
performed on this application at the Pre-SubmlBal Meeting, 1 affirm the Information identified by the City as
necessary for processing the application Is provided herein or the Information will not be prowCedd not otherwise
contained within the submittal, and the City may begin processing the application with the Information as
submitted. This statement serves as written notice pursuant to the requirements of ORS 227.178 pertaining to a
complNe appllu
Owner:
Date: 0 2
Signature
Rlwaed 10.14.11 Rl 2&6
July 27, 2021
Assessor's Map:
18-20-05-23 Tax Lot 0204
NARRATIVE
Applicants:
Bruce Wiechert Custom Homes, Inc.
3073 Skyview Lane
Eugene, OR 97405
(541)686-9458
Applicant's
Representative:
The Favreau Group
3750 Norwich Ave.
Eugene, OR 97408
541-683-7048
Attn: Tony Favreau
LAND USE REQUEST
The applicant is seeking approval of the construction of an twenty unit apartment building, 21
vehicle parking spaces and 20 bicycle parking spaces on the subject site.
SITE AND SURROUNDING CHARACTERISTICS
The subject site is currently is vacant. The surrounding properties are zoned medium density on all
sides.
An existing 8" wastewater pipe will be extended along Horace St. and stubbed to the site. The site
naturally drains to the north. The site will have a detention pond to limit flows to pre -development
flows and overflow into the existing storm drain in Horace St. There is an existing water main on
the north side of Horace St. and will be stubbed to the site. Telephone, gas and cable are also
adjacent to the site.
SITE PLAN APPROVAL
The applicant is seeking an approval of an eight unit apartment building of approximately 3,500
square foot footprint on two stories and a 12 unit apartment building of approximately 4,560 square
foot footprint on two stories. Each unit will have a minimum of one off street parking space and
one bicycle storage space. The site will be landscaped. The proposed development is compatible
with the surrounding developments. The nearest transit facility is located on Main St. just east of
42nd St.
3.2-240 Multi -unit Design Standards
A. Applicability. In all residential districts, multi -unit development (3 or more attached units)
shall comply with the design standards of this Section. In cases where the standards of this
Subsection conflict with other standards in this Code, the standards of this Section shall prevail.
B. Purpose. The purpose of this Section is to:
1. Promote the livability, neighborhood compatibility and public safety of multi -unit
housing in the community; and
2. Promote higher residential densities inside the urban growth boundary that will
utilize existing infrastructure and improve the efficiency of public services and facilities.
C. Review. All multi -unit developments shall be reviewed as a Type II Site Plan Review
application as specified in Section 5.17-100. The Director may also determine that a multi -unit
development is subject to a Type III review when it is in the public interest. In addition, the
applicant may choose the Type III Alternative Design procedure specified in Section 3.2-245 when
proposing an innovative design that may preclude compliance with some or all of the design
standards in this Section.
D. Design Standards. Al of the following design standards shall be met by all multi -unit
developments: Building Orientation; Building Form; Storage; Transition and Compatibility Between
Multi -unit and LDR Development; Open Space; Landscaping; Pedestrian Circulation; Parking; and
Vehicular Circulation.
1. Building Orientation. Multi -unit developments, when abutting a private, local, collector, or arterial
street that has existing or planned on -street parking, shall have
Building Oriented to the street along a minimum of 50 percent of the site's frontage (See
Figure 3.2-M). The "orientation` standard is met when all of the following criteria are met:
a. Primary building entrances shall face the street;
RESPONSE: The lower units fronting Horace Street will have their doors face
Horace Street.
b. The front of the buildings shall be within 25 feet of the front lot/parcel line,
RESPONSE: The building is setback from the Horace Street right-ot-way ten
feet.
EXCEPTION: Open, courtyard space in excess of 25 feet may be placed in front of
building entrances. Open courtyard space is defined as usable, hard -surfaced space
with pedestrian amenities including benches, seating walls or similar furnishings.
C. Off-street parking or vehicular circulation shall not be placed between
buildings and streets used to comply with this standard;
RESPONSE: The parking is on the side of the buildings.
d. Wetlands, slopes over 15 percent as specified in Section 3.3-500, and
wooded areas protected by Section 5.19-100, shall not be counted as "frontage` for
determining required building orientation. For example, if jurisdictional wetlands
and/or wetland buffer occupy 100 feet out of a total of 400 feet, then only 300 feet
is counted as "frontage" for determining required building orientation. In this
example, 150 feet (50 percent) is the required amount of frontage to meet the
building orientation requirement.
RESPONSE: Does not apply.
2. Building Form. New multi -unit construction shall comply with the following building
form standards (See Figure 3.2-N).
a. Structures that have 1 or 2 stories shall not have continuous horizontal
distance exceeding 160 feet (measured from end wall to end wall).
RESPONSE: The eight unit building is 80'x 44', and the 12 unit building is
120' x 44'.
EXCEPTION: As specified in Subsection 3.d., below, structures that have 3 or
greater stories shall not have a continuous horizontal distance exceeding 120 feet
(measured from end wall to end wall);
b. Roofs shall have gable, hip, or gambrel forrts (minimum pitch 3 to 12) with
at least a 6 -inch overhang;
RESPONSE: The roof pitch is over 3:12.
C. A minimum of 15 percent of the front fagade (area measurement) shall
contain windows or doors. All windows and doors shall provide 4 -inch trim or be
recessed (i.e., into the front fagade) to provide shadowing.
RESPONSE: See Architect's Plans.
d. Garages attached to living units and accessed from the street (front
setback) shall be recessed at least 4 feet behind the front facade of a dwelling
structure; and
RESPONSE: Does not apply.
a. Exterior building elevations shall incorporate design features including
offsets, balconies, projections, window reveals, or similar elements to preclude large
expansions of uninterrupted building surfaces. Along the vertical face of a structure,
the features shall occur at a minimum of every 30 feet, and on each Aoorshall
contain a minimum of 2 of the following features:
RESPONSE: See Architect's plans.
E Recesses (e.g., deck, patio, courtyard, entrance, window reveals) that have
a minimum depth of 3 feet;
RESPONSE: See site plan.
g. Extensions (e.g., floor area, deck, patio, entrance) that have a minimum
depth of 2 feet and minimum length of 4 feet; and/or
h. Offsets or breaks in roof elevation of 2 feet or greater in height.
RESPONSE: See architect's plan.
3. Transition and Compatibility between Multi -unit and LDR Development. Multi -unit
developments adjacent to properties designated LDR shall comply with the transition area
and compatibility standards listed below, unless it can be demonstrated that adjacent LDR
property is committed to a non-residential use e.g., church) that us unlikely to change (See
Figures 3.2-0 and 3.2-P). In evaluating the status of an adjacent property, the Metro Plan
designation shall take precedent over the current zone or use.
a. When a single-family residence is within 75 feet of the subject multi -unit
development site and the residence is on the same side of the street and same
block, a setback similar to that of the nearest single-family residence shall be used
for the front yard. "Similar` means the multifamily development setback is within 5
feet of the setback provided by the nearest single-family residence. For example, of
the single-family residence setback is 20 feet, then the multi -unit building shall be
set back by 15 to 25 feet. The minimum front yard setback shall be 10 feet, as
specified in Section 3.2-215; and
RESPONSE: All setbacks are 10'.
b. A 25 -foot buffer area shall be provided between multi -unit development and
property lines abutting an LDR property line, not including those property lines
abutting rightof-ways. Within the 25 -foot buffer area, the following standards
apply:
RESPONSE: Does not apply.
i. No vehicular circulation (i.e., driveways, drive lanes, maneuvering
areas, and private streets) is allowed within the buffer, unless driveway
placement within a buffer is required in order to comply with City, County or
ODOT access management standards;
ii. Site obscuring landscaping shall be required. The City may require
retention of existing vegetation; installation of a 6 -foot minimum height,
site -obscuring fence with shade trees planted a maximum of 30 feet on
center (2 -inch caliper at planting); and/or other landscaping to provide
visual buffering. In addition, the City may require acoustical barriers when
parking is proposed within the transition area;
iii. Building encroachments are allowed, provided no building may
encroach more than 10 feet into the 25 foot buffer and no primary entrance
shall face the abutting LDR property. Buildings shall not exceed 1 story or
21 feet within the buffer, and shall comply with all other applicable setbacks
and transition areas specified elsewhere in this Code;
iv. No active recreation areas (including, but not limited to: tot lots,
swimming pools) are allowed within the 25 -foot buffer (garden spaces shall
not be considered active recreation areas);
V. Light standards shall be 12 feet or las in height and shielded so
that light does not allow direct illumination onto adjacent LDR property or
into dwelling units;
Vi. Mechanical equipment shall be screened from view (i.e., as viewed
from adjacent properties and street), and shall be buffered so that noise
does not typically exceed 45 to 50 decibels as measured at the LDR
property line. The City may require a noise study certified by a licensed
acoustical engineer; and
Vii. Al rooftop equipment shall be hidden behind parapets or other
structures designed into the building.
C. Buildings, or portions of buildings abutting an LDR property line or
designation (i.e., side or rear lot/parcel line) outside of the 25 -foot buffer described
above, shall not exceed a building height greater than 1 foot for each foot distance
from the LDR property line. For example, a building or portion of a building 30 feet
in height shall be 30 feet from the LDR property line. This standard applies up to a
distance or 50 feet from the LDR property line. See also, Sections 3.2-215 and 4.4-
110.
RESPONSE: Does not apply.
d. Structures within 50 feet of an LDR zone shall not have a continuous
horizontal distance exceeding 120 feet (measured from end wall to end wall).
4. Storage. Multi -unit development shall provide space for trash receptacles, storage
and equipment as specified in the following standards (See Figure 3.2-M):
a. Adequate, accessible and secure storage space shall be provided for each
dwelling. A minimum of 112 cubic feet of enclosed storage is required separate from
the living unit. Garages and storage units adjoining a dwelling (e.g., attached to
decks and patios) shall qualify as storage space;
RESPONSE: See architect's plan.
b. Trash receptacles shall be screened from view by placement of a solid wood
fence, masonry wall, or similar sightobscuring, gated enclosure, from 5 to 6 feet in
height, Obscuring landscaping shall be planted a minimum 24 inches in height at
planting around all exposed sides of the wall or fence, unless breaks are provided
for gates. See also, Section 4.4-110;
RESPONSE: Trash enclosure is shown on the Site plan.
C. No trash receptacles shall be located in any front yard setback, or within 25
feet of property lines abutting LDR zoned or designated properties; and
RESPONSE: Trash enclosure is shown on the site plan.
d. Ground -mounted equipment, including exterior transformers, utility pads,
cable television and telephone boxes and similar utility services, shall be placed
underground, where practicable. When placed above ground, equipment shall be
placed to minimize visual impact; or screened with a wall or landscaping. When
walls are used they shall be tall enough to completely screen the equipment at the
time of the equipment installation. Landscaping shall be planted tall enough to
attain 50 percent coverage after 2 years and 100 percent coverage within 4 years.
S. Open Space. Multi -unit developments shall provide both Common Open Space and
Private Open Space as specified in the following standards (See Figure 3.2-Q):
a. General. Inclusive of required yards, a minimum of 15 percent of the gross
site area shall be designated and permanently reserved a open space. The total
required open space is the sum of setbacks, common open space, and private open
space. Inventoried natural features (including regulated wetlands) and/or historic
features on-site may be counted toward up to 50 percent of common open space
requirements. See Chapter 6 for definitions of open space; open space, common;
and open space, private.
RESPONSE: The total site area is 32,049 s.f. and the open space area is 13,845 s.f.
which is 43%.
I. Multi -unit developments in mixed-use buildings are exempt from
these standards.
ii. Multi -unit developments at densities exceeding 30 units per gross
acre shall include a minimum of 10 percent of the gross site as open space,
which may be any combination of yards, common open space and private
open space.
iii. Multi -unit developments at densities less than 30 units per gross
acre shall provide open space as specified in the amounts specified below.
b. Common Open Space shall be provided in all newly constructed multi -unit
development as specified in the following standards:
I. A minimum of 0.25 square feet of common open space shall be
required for each square foot of gross residential floor area;
ii. Common open space areas provided to comply with this standard
shall be at least 500 square feet with no horizontal dimension less than 15
feet;
iii. A maximum of 15 percent of the required common open space can
be on slopes greater than 25 percent; and
IV. Multi -unit developments shall designate within common open space
a minimum of 250 square feet of active recreation area (including, but not
limited to: children's play areas, play fields, swimming pools, sports courts)
for every 20 units or increment thereof. For example, a 60 unit development
shall provide a minimum area of 750 square feet for active recreation. No
horizontal dimension shall be less than 15 feet.
EXCEPTION: As determined by the Director, qualified senior housing
developments may be excluded from this requirement; however, all other
common open space requirements apply;
V. Placement of children's play areas shall not be allowed in any
required yard setback or transition area;
Vi. Landscaping and/or natural vegetation shall occupy a minimum of
50 percent of required common open space. Onsite natural resources and
historic features which are accessible to residents (including, but not limited
to: by trails, boardwalks) may be used to partially or fully satisfy this
requirements; and
Vii. Indoor or covered recreational space (including, but not limited to:
swimming pools, sports courts, weight rooms) shall not exceed 30 percent
of the required common open space area.
Viii. Exemptions to the common open space standard may be granted
for mulb-unit developments of up to 60 units (or for the first 60 units of a
larger project) when the developments are within 1/4 mile (measured
walking distance) to a public park; and there is a direct, improved,
permanent, public, Americans with Disabilities Act (ADA)sccessible, lighted,
maintained pedestrian trail or sidewalk between the site and the park. An
exemption shall be granted only when the nearby park provides active
recreation area, as defined by Subsection iv., above.
ix. Phasing shall not be used to circumvent common open space
standards.
X Common Open Space does not include required yards or transition
areas unless authorized under Sections 3.2-245 or 3.2-250.
C. Private Open Space shall be provided in all newly constructed multi-unit
developments, to comply with the following standards:
L All private open space shall be directly accessible from the dwelling
unit through a doorway;
ii. Dwelling units located at or below finished grade, or within 5 feet of
finished grade, shall provide a minimum of 96 square feet of private open
space, with no dimension less than 6 feet; and
iii. Private Open Space provided may be deducted from the required
amount of Common Open Space. For example, a project with 37,500 square
feet of gross floor area requires 9,375 square feet of Common Open Space
under Subsection b.l., above. If 2,400 square feet of Private Open Space is
provided, the minimum Common Open Space requirement may be reduced
to 6,975 square feet (9,375 — 2,300).
6. Landscaping, Fences and Walls. Multi -unit developments shall provide landscaping
as specified in Section 4.4-105 and the following standards (See Figure 3.2Q):
RESPONSE: See landscaping plan.
a. A minimum of 15 percent of the site shall be landscaped with a mix of
vegetative ground cover, shrubbery and trees. Trees, a minimum 2 inches (dbh) in
caliper, and shrubbery, a minimum of 24 inches in height, shall be planted. Bark
mulch, rocks and similar non -plant material may be used to compliment the cover
requirement, but shall not be considered a sole substitute for the vegetative ground
cover requirement;
b. Street trees, a minimum 2 inches (dbh) caliper, shall be placed within the
planter strips between the curb and the sidewalk. Street trees shall be planted 1 per
every 30 linear feet (minimum) of street frontage, as specified in Section 4.2-140;
C. Fences in front yards and along any frontage used to comply with the
building orientation standard shall be limited to 3 feet in height. Fences in other
yards shall comply with the fence standards specified in Section 4.4-115, and the
vision clearance standards specified in Section 4.2-130; and
d. The use of native and/or drought -tolerant landscaping is encouraged. All
landscaping shall be irrigated with a permanent irrigation system unless a licensed
landscape architect submits written verification that the proposed plant materials do
not require irrigation. The property owner shall maintain all landscaping.
7. Pedestrian Circulation. Multi -unit developments with more than 20 units shall
provide pedestrian circulation as specified in the following standards (See Figure 3.2-11):
RESPONSE: Does not apply.
a. Continuous internal sidewalks shall be provided throughout the site.
Discontinuous internal sidewalks shall be permitted only where stubbed to a future
internal sidewalk on abutting properties, future phases on the subject property, or
abutting recreation areas and pedestrian trails;
b. Internal sidewalks shall be separated a minimum of 5 feet from dwellings,
measured from the sidewalk edge closest to any dwelling unit;
C. The internal sidewalk system shall connect all abutting streets to primary
building entrances;
d. The internal sidewalk system shall connect all buildings on the site and shall
connect the dwelling units to the parking areas, bicycle parking, storage areas, all
recreational facilities and common areas, and abutting public sidewalks and
pedestrian trails;
e. Surface treatment of internal sidewalks shall be concrete, asphalt or
masonry pavers, at least 5 feet wide. Multi -use accessways (e.g., for bicycles,
pedestrians and emergency vehicles) shall be of the same materials, at least 10 feet
wide. Where emergency vehicle access is required, there shall be an additional 5
feet on either side of the accessway. The additional 5 foot area may be turf -block,
grass-crete or similar permeable material on a base of gravel capable of supporting
fire equipment weighing 80,000 pounds.
E Where internal sidewalks cross a vehicular circulation area or parking aisle,
they shall be clearly marked with contrasting paving materials, elevation changes,
speed humps, or striping. Speed humps shall be subject to review and approval by
the Fire Marshal. Internal sidewalk design shall comply with Americans with
Disabilities (ADA) requirements;
8. Where the internal sidewalks are parallel and abutting to a vehicular
circulation area, the sidewalk shall be raised or be separated from the vehicular
circulation area by a raised curb, bollards, landscaping or other physical barrier. If a
raised sidewalk is used, the ends of the raised portions shall be equipped with curb
ramps; and
h. All on-site internal sidewalks shall be lighted to a minimum of 2 foot-
candles.
8. Parking. Multi -unit developments shall provide parking design as specified in the
following standards:
a. Parking lots shall be placed to the side or rear of buildings as specified in
the Building Orientation Standards. Parking shall not be placed along that portion of
the street where building firontages are used to comply with the building orientation
standard;
RESPONSE: See site plan.
b. Lighting shall be provided for safety purposes, and focused/shielded to
avoid glare on adjacent properties or dwellings as specified in Section 4.5-100;
RESPONSE: See Architect's plan.
C. There shall be 1 planter island for every 8 parking spaces. Planter islands
shall be a minimum of 6 feet wide, exclusive of the curb, the full length of a parking
space containing 1 shade tree (a minimum 2 inches (dbh) in caliper at planting) and
vegetative ground cover. Trees shall be specimens capable of attaining 35 feet or
more in height at maturity and shall not produce excessive fruit, nuts, or sap (i.e.,
die to pest damage). Bark mulch is not an acceptable substitute for vegetative
ground cover in the planter island. Water quality features may be incorporated into
planter islands. Landscape areas shall be evenly distributed throughout the
perimeter of in tenor parking areas, where practicable. See Section 4.4-105F. for
recommended shade trees;
RESPONSE: See landscape plan.
d. A minimum 6 -foot wide planter area shall separate and visually screen
parking from living area windows. The planter area shall include a mix of ground
cover, shrubbery, and trees with appropriate growth habit (i.e., for narrow planters
and any height limitations including balconies, overhangs, and eaves). Shrubbery in
this planter area shall be at least 24 inches in height at the time of planting, and
trees a minimum of 2 inches (dbh) in caliper at the time of planting. See Section
4.4-110;
RESPONSE: See landscape plan.
a. Parking lots shall be connected to all building entrances by means of
internal sidewalks;
RESPONSE: See site plan.
E All parking stalls fronting a sidewalk, or landscaped area shall be provided
with a secure wheel bumper not less than 6 inches in height and set back from the
front a minimum of 2 feet to allow for vehicle encroachment. Wheel bumpers, if
used, shall be a minimum of 6 feet in length. As an option , the sidewalk or planter
may be widened 2 feet beyond the minimum dimension required to allow for vehicle
encroachment. The sidewalks and planters shall be protected by a curb not less
than 6 inches in height. See also, Section 4.6-120C;
RESPONSE: See site plan.
g. On corner lots/parcels, parking areas shall not be located within 30 feet of
an intersection, as measured from the center of the curb return to the edge of the
parking area (curb or wheel stop);
RESPONSE: Does not apply.
h. All parking, maneuvering and loading areas abutting a property line or night -
of -way shall provide perimeter lot/parcel landscaping. A minimum 5 -foot wide
planting strip shall be planted with shade trees, a minimum 2 inches (dbh) in
caliper, and a low level (e.g., 30 to 40 inches) evergreen hedge. See also Section
4.4-105;
RESPONSE: See landscape plan.
i. Decorative walls may be used in place of the hedge in Subsection h., above,
and shall be placed no closer than 4 feet from the property line. The decorative wall
shall be a minimum of 30 inches in height and no more than 40 inches in height,
and shall comply with the vision clearance standards specified in Section 4.2-130.
Decorative walls shall be constructed of textured concrete masonry (CMU) or similar
quality material, and include a cap. The wall may be partially see-through (up to 40
percent) as appropriate for security purposes. The area between the wall and
property line shall be landscaped with shade trees;
RESPONSE: See landscape plan.
j. Parking area landscaping shall be designed to reduce stone water runoff
(e.g., through infiltration swales and other measures), as practicable; and
RESPONSE: See landscape plan.
10
k. Bicycle parking shall be provided as specified in Section 4.6-140-155 and
may be incorporated into the landscaping design.
RESPONSE: Sea site plan.
9. Vehicular Circulation. Multi -unit developments shall provide vehicular circulation as
specified in the following standards (See Figure 3.2-11):
a. The onsite driveway (or private street) system shall connect with public
streets abutting the site;
RESPONSE: See site plan.
b. Shared driveways shall be provided whenever practicable to minimize cross
turning movements on adjacent streets. On-site driveways and private streets shall
be stubbed to abutting MDR/HDR properties, at locations determined during Site
Plan Review process to facilitate development of shared driveways; and
RESPONSE: See site plan.
C. Parking areas shall be accessed from alleys when properties abut an alley,
or an alley can reasonably be extended to serve the development.
RESPONSE: Does not apply.
11
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HORACE STREET APARTMENTSDRAINAGE STUDY
July 27, 2021
SITE CHARACTERISTICS
The subject properly is identified on County Assessor's Maps as 18-20-05-23-0204. It is located on the south side of
Horace Street, east of Filbert Sl. The site is an open field and consists of about 0.74 acres.
EXISTING HYDROLOGY
The site is relatively flat and portions of the site drain to the north.
PROPOSED HYDROLOGY
There is approximately 18,204 square feel of impervious area that will be directed towards a filtration planter on site. The
required size of the filtration planter was determined by the City of Eugene Stormwaler Surface Filtration/Infiltration
Facility Sizing Spreadsheet and was sized for flow control. The required filtration planter is 1,450 square feel, with 1,589
square feel provided. Attached are the calculations.
CONCLUSION
Based on my calculations and the proposed drainage system is sized properly and will provide the necessary flow control.
20182410
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EXPIRES DEC. 31. 2021
ji1j.d.�—
Stormwater Surface FiltrationAnfiltration Facility Sizing Spreadsheet
24 Hour Storm, NRCS Type 1 A Rainfall Distribution
City of Eugene
Name:
Horace St.2 Unit Apmtmr
Address:
Horace
Impervious Area CN=l
Sorinafield. OR [Zip Codel
or:
Anthony J. Fayreau
TY:
The Fmmeeu Group
Date: 7/8/2021
Permit Number: Permit
CatchmentlD: Entire Subdivision
Complete this form for each drainage catchment in the project site that is to be sized per the Presumptive Approach.
Provide a distinctive Catchment ID for each facility coordinated with the site basin map to correlate the appropriate
calculations with the facility.
The maximum drainage catchment to be modeled per the Presumptive Approach is 1 acre (43,560 SF)
=or infiltration facilities in Class A or B soils where no infiltration testing has been per romed use an infiltration rate of 0.5 in/for.
For all facilities use a maximum soil infiltration rate of 2.5 in/hr for lommi/growing medium.
loses'Ym' from the dmpdown loxes below next to the design standards requirements for this facility.
Pollution Reduction (PR)Yes
Flow Control (FC)j Yes
Destination(DT) No 'Animiio-ationkciiiry rnuA1vrhsenas memr1l1Vrvem rroOcivsonmion 2qui2rrow
Total Square Footage Impervious Area=
=5
sgfl
Total Square Footage Pervious Area= 14209 sqN
Impervious Area CN=l
98
Flow Control
Pervious Area CN=l 85
Total Square Footage of Drainage Area=
31925
sfi
Time of Concentration Post Development= min
Weighted Average CN=l
92
Pre�Development CN= 85 Time of Concentration Pre�Development= 10 min
Tested Soil Initiation Rate= 1 rotor (Soo role 4) Destination Design=®iNhr
Design Soil Infiltration Rate=Iin/hr Soil Infiltration Rate
R uirement
Rainfall De h
Desi nStorm
Stoma
P011otlonlVuIlon
1.4inches
Water
Flow Control
3.6 inches
Flood Control
Destination
I 3.6 inches
Flood Control
Facility
Max. Ponding Depth
in Stormwater Facility=
Depth of Growing Medium (So
]/2]/2021-3:24 PM
Facility Surface
Facility Surface Pern
Facility Bottom
Facility Bottom Pern
Ratio of Facility Area to
Basin Vc
Pollution Reduction-Calculation Results
Peak Flow Rate to Stormwater Facility = 0.136 cfs
Pik Facility Overflow Rate= 0.000 cfs
Total Runoff Volume to Stormwater
Facility 193] cf
Total Overflow Volume= 0 cf
Max. Depth of Stormwater in Facility= 2.0 in
Drawdown Time= 02 hours
Yes Facility Sizing Meets Pollution Reduction Standards?
VES Meets Requirementof No Facility Flooding?
VES Meets Requirement for Maximum of 18 Hour Drawdown Time?
Flow Control-Calculation Results
Peak Flow Rate to Stormwater Facility = 0.579 cfs
Peak Facility Overflow Rate= 0.358 cfs
Total Runoff Volume to Stormwater
Facility= 718 cf
Total Overflow Volume= 3297 cf
Peak Off -Site Flow Rate
Max. Depth of Sierra in Facility= in
Filtration Facility Underdrain= 0.034 cfs
Drawdown Timms hours
Pre-Development Runoff Data
Peak Flow Rate = 0.362 cfs
Total Runoff Volume =1 5597 cf
=Facility Sizing Meets Flow Control Standards?
VES Meets Requirement for Post Development offsite flow less or equal to Pre-Development Flow?
VES Meets Requirement for Maximum of 18 Hour Drawdown Time?
Destination-Calculation Results
Peak Flow Rate to Stormwater Facility = N/A cfs
Peak Facility Overflow Rate= N/A cfs
Total Runoff Volume to Stormwater
Facility= N/A cf
Total Overflow Volume= N/A cf
Max. Depth of Stormwater in Facility- N/A in
Drawdown Time= N/A lours
N/A Facility Sizing Meets Destination Standards?
=Meets Requirement of No Facility Flooding?
L.2LAJMftt, Requirement for Maximum of 30 hour Drawdown Time?
7/0/2021-3:24 PM