Orchard Park Subdivision_Preliminary PlatPlanning Services Department
City Hall
50 West 13th Street
Dubuque, IA 52001 -4864
(563) 589 -4210 phone
(563) 589 -4221 fax
(563) 690 -6678 TDD
planning@cityofdubuque.org
The Honorable Mayor and City Council Members
City of Dubuque
City Hall — 50 W. 13 Street
Dubuque IA 52001
Applicant:
Location:
Description:
Dear Mayor and City Council Members:
Service People Integrity Responsibility
Masterpiece on the Mississippi
Innovation Teamwork
Dubuque
ill#MrAa01►
'TIIr'
2007
April 9, 2010
Fondell Excavating
Between Roosevelt Avenue & Shiras Avenue (North of Eagle Valley and
South of Orchard Hills)
Preliminary Plat of Orchard Park Subdivision
The City of Dubuque Zoning Advisory Commission has reviewed the above -cited
request. The application, staff report and related materials are attached for your review.
Discussion
A representative of the applicant spoke in favor of the request, reviewing the layout of
the subdivision, number of lots and location of the future city water tower.
Staff reviewed the proposed subdivision regarding street layout and street cross -
sections, lot sizes, erosion control requirements, including necessary State and City
permits. Staff reviewed the vehicle counts on Roosevelt Road, the proposed extension
of Baldwin Street, and the City's stormwater management review process.
Staff reviewed the three sustainability measures of the plat: 1) A 27 -foot wide street, 2)
street trees, and 3) solar subdivision. Staff noted the plat requires waiving the public
right -of -way and street width.
Staff distributed aerial photos of Clover Hills Subdivision, noting it is similar in terms of
building style and density. Staff also provided a letter of support for the Baldwin Street
connection from the Fire Department, the City's CIP budget for a water tower in this
subdivision, and benefits of a solar subdivision.
There were several public comments regarding the density of the proposed subdivision,
vehicle trips through the adjacent Orchard Hills Subdivision, the condition of Roosevelt
Road and its ability to handle additional traffic, and impact on property values because
of the small size of the houses proposed. Speakers also cited concerns regarding the
ability of the existing stormwater management system to handle additional runoff from
the new subdivision.
The Honorable Mayor and City Council Members
Page 2
The Zoning Advisory Commission discussed the request, noting that the City doesn't
regulate whether a home has a basement or garages. The Commission discussed the
street layout, cul -de -sac radius, access to Baldwin Street, development density, erosion
control requirements and storm shelters.
Recommendation
By a vote of 5 to 2, the Zoning Advisory Commission recommends that the City Council
approve the request, subject to waiving street width and right -of -way width for streets D,
E, F and G as shown on the preliminary plat.
A simple majority vote is needed for the City Council to approve the request.
Respectfully submitted,
Jeff Stiles, Chairperson
Zoning Advisory Commission
cc: Gus Psihoyos, City Engineer
David Harris, Housing & Community Development Director
Robert Green, Water Department Manager
Dan Brown, Fire Chief
Service People Integrity Responsibility Innovation Teamwork
❑ Variance
❑ Conditional Use Permit
❑ Appeal
❑ Special Exception
❑ Limited Setback Waiver
Property Owner(s):
Applicant /Agent:
Please type or print legibly in ink
Property owner(s): Fondell Excavating Inc.
PLANNING APPLICATION FORM
❑ Rezoning
❑ Planned District
® Preliminary Plat
❑ Minor Final Plat
❑ Text Amendment
❑ Simple Site Plan ❑ Annexation
❑ Minor Site Plan ❑ Temporary Use Permit
❑ Major Site Plan ❑ Certificate of Economic Non - Viability
❑ Major Final Plat ❑ Certificate of Appropriateness
❑ Simple Subdivision ❑ Other:
c/o Jim Kemp
City of Dubuque
Planning Services Department
Dubuque, IA 52001 -4864
Phone: 563-589-4210
Fax: 563 - 589 -4221
Phone: 584 -0505
Address: 2270 Crown Point Rd. City: Dubuque State: IA Zip: 52002
Fax Number: Mobile /Cellular Number: 590 - 0406
Applicant /Agent: Phone:
Address:
City: State: Zip:
Fax Number: Mobile /Cellular Number:
Site location /address: Between Roosevelt Ave. & Shiras Ave. North of Eagle Valley & South of Orchard Hills.
Existing zoning: R -1 Proposed zoning: Historic District:
Landmark:
Legal Description (Sidwell parcel ID# or lot number /block number /subdivision): (1107101001)
Lot 1 - 2 - 2 of Min. Lot 311
Total property (lot) area (square feet or acres): 18 ac
Describe proposal and reason necessary (attach a letter of explanation, if needed):
For the construction of a new residential subdivision
CERTIFICATION: I /we, the undersigned, do hereby certify that:
1. The information submitted herein is true and correct to the best of my /our knowledge and upon
submittal becomes public record;
2. Fees are not refundable and payment does not guarantee approval; and
3. All additional required written and graphic materials are attached.
Date:
Date:
FOR OFFICE U NLY — PLICATION SUBMITTAL CHECKLIST
Fee: Received by: 4.- i Date: Z. Z3• to Docket:
❑Site /sketch plan ❑Conceptual Development Plan ❑Photo ['Plat
❑Improvement plans ❑Design review project description ❑Floor plan ❑Other:
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/1106355004 1
1116 Jonathan In.
, DMne. Anaruth M.
_. LOT_ 4_
1. PROPOSED ROW WIDTH: 50', AND 42' WITH 90' DIA. CUL -DE -SAC.
PROPOSED STREET WIDTH. 31', AND 27' WITH 75' DIA. CUL -DE -SAC
2. LOT 1 -2 -2 OF MIN LOT 311, (Parcel ID 1107101001). IS PRESENTLY
PRESENTLY OWNED BY:
Fondell EKcovot,nq Inc. / 2270 Crown Point Rd. / Dubuque, IA 52002
3. LOT 1 -2 -2 OF MIN. LOT 311 IS PRESENTLY ZONED R -1.
4. ALL ELEVATIONS AND CONTOURS SHOWN ON THIS PLAT ARE ON AN
ARBITRARY DATUM CONTOUR INTERVAL IS 2 FEET.
5. ON THE 42' WIDE STREETS. THERE WILL BE "NO PARKING" ON THE
NORTH SIDE OF THE STREETS ON LOTS D & G, THE EAST SIDE OF THE
STREET ON LOT E AND THE WEST SIDE OF THE STREET ON LOT F THERE
IS ALSO "NO PARKING" IN THE CUL -DE -SACS.
6. A MAJORITY OF THOSE AREAS BEING DEVELOPED FOR HOMES WILL BE
DISTURBED, AND A MAJORITY OF LOT J, EXCEPT FOR THOSE AREAS NEEDED
FOR DETENTION AND UTILITIES, WILL REMAIN UNDISTURBED.
7. THERE ARE 2 DETENTION AREAS SHOWN IF NEEDED. THE DETENTION
BASIN WITHIN THE EAGLE VALLEY SUBDIVISION WAS DESIGNED TO INCLUDE A
MAJORITY OF THIS SUBDIVISION, IF DEVELOPED INTO 1/4 ACRE LOTS SINCE
THE LOTS ARE NOW SMALLER THAN 1/4 ACRE, NEW CALCULATIONS WILL
NEED TO BE PERFOREMED DURING THE FINAL PLATTING PROCESS THAT WILL
DETERMINE HOW MUCH STORM WATER CAN BE HANDLED BY THE EAGLE
VALLEY DETENTION BASIN AND IF ONE OR BOTH OF THE DETENTION BASINS
SHOWN ARE NEEDED.
1 LOT 1 \
TOTAL AREA = 18 3 oc
ROW AREA = 161,678sf / 3 71oc
LOT A = 4,613sf
LOT B = 31,028sf
LOT C = 7,836sf
LOT D = 38,102sf
LOT E = 11,991sf
LOT F = 9,921sf
LOT G = 39,239sf
LOT H = 18,948sf
- o' CHARDHILLS
BLOCK - -- - -- 2160 J
- - 1106356002 ,
11 i- 1 - - - _ - 61atha11 U,
3235 , I Radek Krat;� J9M• 1 6
Ferry. Jolm 1 a eR RS -. -. - - \ \
NTINUE LOT 8, - LOT ' ; 7
PRELIMINARY PLAT
OF ORCHARD PARK SUBDIVISION
AS COMPRISED OF LOT 1 -2 -2 OF MIN. LOT 311
LOCATED IN THE NW 1/4 OF SEC. 7, T89N, R3E,
CITY OF DUBUQUE, IOWA
1 I 1
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5USTAINABILITY MEASURES PROPOSED
1. SOLAR SUBDIVISON
2 27 -FOOT WIDE STREET
}, STREET TREES
\ LOT 115 'TO BE 11
1 DEDICA TED TO' THE Of TY ' ' II
'
OR DE TEN TIOIO PURPO ES . 1 \
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LOT TOTAL
BL 1 16 LOTS
BL. 2 4 LOTS
BL 3 20 LOTS
BL 4 20 LOTS
BL 5 4 LOTS
BL 6 5 LOTS
BI 7 5 IOTS
TOTAL 74 LOTS
- 30 POINTS
= 5 POINTS
= 5 POINTS
TOTAL 40 POINTS
� 112
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EXISTING PROPERTY LINE
EXISTING PERIMETER
PROPOSED PROPERTY LINE
CENTERLINE
PROPOSED EASEMENT LINE
XTG. SANITARY SEWER
XTG STORM SEWER
XTG. WATER
XTG. OVERHEAD ELECTRIC
XTG. STREETS (CURB & GUTTER)
PRO. SANITARY SEWER
PRO. STORM SEWER
PRO. WATER MAIN
PRO. STREETS (CURB & GUTTER)
PRO. BUILDING SETBACK
XTG. CONTOUR
XTG TREE LINE
LEGEND
BACK OF CURB
80C TO BOC
RIGHT OF WAY
EXISTING
PROPOSED
STREET LIGHT
POWER POLE
FIRE HYDRANT
WATER VALVE
MANHOLE
CATCH BASIN
SANITARY SEWER
STORM SEWER
FLARED END SECTION
PORTLAND CEMENT CONCRETE
ASPHALT CEMENT CONCRETE
BENCHMARK
RADIUS
CURB & GUTTER
SUBDIVISION STAFF REPORT Zoning Agenda: April 7, 2010
Project Name:
Property Owner:
Applicant:
Number of Lots: 74
Acreage in R.O.W: 3.71 acres
Total Area: 18 acres
In City: Yes
In 2 -Mile Area: N/A
Flood Plain: No
Proposed Land Use: Residential
Existing Land Use: Vacant
Adjacent Land Use: North — Residential
East — Residential
South — Residential
West — Vacant
Preliminary Plat of Orchard Park Subdivision
Fondell Excavating, Inc /Jim Kemp
Same
Density Allowed: 1/5,000 sq. ft.
Commonly owned lots: None
Sanitary Sewer: Yes
Water: Yes
Storm Sewer: No
Existing Street Access: Yes
Proposed Zoning: N/A
Existing Zoning: R -1
Adjacent Zoning: North — R -1
East — R -1
South — PR
West — AG
Physical Characteristics: The subject property is located between Eagle Valley
Subdivision to the south and Orchard Hills Subdivision to the north. The property has
frontage on Roosevelt Road with access from stub streets from Eagle Valley
Subdivision (Golden Eagle Drive) and Orchard Hills Subdivision (Baldwin Drive). The
property generally slopes to the southeast and is currently vacant.
Proposed Phasing:. None.
Previous Conditions of Zoning or Plats: None.
Dedication of Open Space or Public Amenities: None.
Proposed Streets and Grades: Street A — 12 %; Street B — 4 -7 %; Street C — 3 %; Street
D — 2 -10 %; Street E — 3 -8 %; Street F — 3 %; and Street G — 2 -8 %.
Recommended Motion: Planning staff recommends approval of the submitted
Preliminary Plat of Orchard Park Subdivision subject to waiving right -of -way and street
width requirements for streets D, E, F, and G. The Preliminary Plat is in all other
respects in compliance with the City of Dubuque Subdivision Regulations.
Subdivision Staff Report — Preliminary Plat of Orchard Park Subdivision Page 2
Conformance with Comprehensive Plan: The proposed subdivision involves the
Comprehensive Plan Land Use Element Goals 1.2, 1.5, 1.10, 4.3, 7.2 and 9.4. and
Transportation Goals 1.2 and 1.3.
Impact of Request on:
Utilities: Sanitary sewer and storm water can be extended to the site and are
sufficient to serve the subdivision. An existing water main within the Roosevelt
right -of -way is available to serve this site. Improvements may be necessary to the
existing water system provide sufficient water pressure throughout the proposed
subdivision. Any public improvements are subject to availability of funding and
approval by the City Manager and City Council. The approval for construction of
this subdivision is subject to the design plans for service being approved by the
Iowa Department of Natural Resources.
Traffic Patterns: The primary access to the subdivision will be from Roosevelt
Road. Roosevelt Road is classified as a minor arterial and carries approximately
2,900 average daily trips south of the proposed subdivision and 3,200 average
daily trips west of the this subdivision based on 2005 IDOT counts.
Public Services: Existing public services are adequate to serve the site.
Environment: Staff does not anticipate any adverse impact to the environment
provided adequate erosion control is provided during all phases of development of
the property.
Adjacent Properties: The most likely impact to adjacent properties will be an
increase in vehicle trips on Baldwin Drive, Jonathan Lane and Shiras Avenue.
Planning staff notes that residents of the Orchard Hills Subdivision may also utilize
the new streets in the proposed Orchard Park Subdivision to access Roosevelt
Road.
Recommended Conditions on Plat: None.
Staff Analysis: The submitted preliminary plat of Orchard Park Subdivision subdivides
an existing 18 -acre parcel into 74 lots platted for single - family homes. A similar
preliminary plat was denied at the October 7, 2009 Zoning Advisory Commission
meeting.
Access to the subdivision will be primarily from Roosevelt Road where the roadway
transitions from a north -south orientation to an east -west orientation. The subdivision
includes an access to Baldwin Drive, which is part of the Orchard Hills Subdivision.
Subdivision Staff Report — Preliminary Plat of Orchard Park Subdivision Page 3
This stub street was platted as part of the original Orchard Hills Subdivision to allow for
the continued extension of the City street system. The Fire Department has provided a
memorandum that supports this connection as it will allow an alternative access to the
homes in Orchard Hills Subdivision as well as along Shiras Avenue. Currently, there
are 161 homes that have only one means of access in case of emergency in this area.
It has long been a City policy to look for secondary access when either the number of
dwelling units exceeds approximately 40 units or a cul -de -sac length of 1,200 feet is
exceeded. Currently, Shiras Avenue from Lincoln Avenue to the intersection of Eagle
Point Drive and Orchard Drive is 5,500 feet long. Measuring to the northernmost point
of Orchard Drive yields a distance of approximately 6,535 feet or about 1.25 miles.
Planning staff understands that this connection from Roosevelt Road to Baldwin Drive
will allow some motorists to access Eagle Point Park through the two subdivisions.
However, Planning staff notes that the new connection would also save existing
residents of Orchard Hills and Shiras Avenue travel time as they will be able to access
Roosevelt Road through the new Orchard Park Subdivision. The fact that Baldwin
Drive was platted as part of the original Orchard Hills Subdivision's illustrates that the
street was to be extended in the future. In addition, staff has found a copy of the
Preliminary Plat of Orchard Hills No. 2 dated January 24, 1966 which extended Baldwin
Drive and included accesses to Roosevelt Road.
The proposed subdivision includes public streets that will be built to the City's standard
residential cross - section of the 31 -foot wide paving width and a 50 -foot right -of -way as
well as a reduced street cross section (a 27 -foot paving width) with a 42 -foot right -of-
way. The applicant is using the smaller cross section street on the interior of the
subdivision while using the standard residential street for the connection between
Roosevelt road and Baldwin Drive. The smaller cross section street will be restricted to
parking on one side. The developer is proposing the smaller street to help in offering
the proposed housing at a more affordable price as well as complying with the City's
sustainability requirements for new subdivisions.
The 27' street cross - section is restricted to parking on one side. With the curb cut for
each house's two -car parking pad, enough frontage remains to park approximately 1.5
cars per lot. The 27' wide residential street has been approved in several recent
subdivisions. Eagle Valley, Timber -Hyrst and North Fork Trails have all been approved
with the smaller street cross section. The reduced right -of -way width of 42 -foot has
been approved as part of Westbrook Subdivision and Eagle Valley Subdivision.
The proposed subdivision when fully built out will generate approximately 707 average
daily vehicle trips. Roosevelt Road carries 2,900 ADTs south of the proposed
subdivision and 3,200 ADTs west of the subdivision based on 2005 IDOT counts.
The proposed subdivision can be served with City water, sanitary sewer and storm
sewer. Both storm sewer and sanitary sewer access is available in the southeast
Subdivision Staff Report — Preliminary Plat of Orchard Park Subdivision Page 4
corner of the proposed subdivision where these two utilities are stubbed from the
adjacent Eagle Valley Subdivision.
Water service can be taken from Roosevelt Road and will be extended throughout the
subdivision and interconnected with the water main in Baldwin Drive. The Water
Distribution Division has indicated that depending on how the subdivision is graded, that
additional improvements to the water system may be necessary to ensure sufficient
water pressure throughout the subdivision. Any necessary public improvements are
subject to funding availability and approval by the City Manager and City Council. The
Water Department noted that approval for construction of this subdivision is subject to
the design plans for service being approved by the Iowa Department of Natural
Resources.
The proposed subdivision has a density of 4.04 dwelling units per acre, while the
previous proposal (McDonald Subdivision) had a density of 5.4 dwelling units per acre.
As a comparison, Eagle Valley, when fully developed, will have a density of 4.72
dwelling units per acre. The existing Orchard Hills Subdivision has a density of 2.96
dwelling units per acre.
Planning staff has discussed the dedication of property within the subdivision for a
small neighborhood park. The developer offered the 3.3 acre parcel east of the site for
both water detention and a park area. Bob Fritsch of the Leisure Services Department
reviewed the subject property and found that because of the severe slope of the parcel,
it is not conducive for use as a park. Planning staff would note there is money
budgeted in FY2012 and FY2013 for a park in Eagle Valley Subdivision. Orchard Hill
and Eagle Valley Subdivisions are interconnected and the new park in Eagle Valley will
be available to residents of both subdivisions. A copy of the capital improvement line
item for the new park is attached to this staff report.
The Unified Development code now requires that each new subdivision utilize
sustainable development tools and achieve a 40 point score from a list of sustainable
development tools. The applicant has achieved a 40 point total with a mixture of
sustainable tools.
The preliminary plat of Orchard Park Subdivisions proposes three sustainability
measures, including the following:
1. A 27 -foot wide street, which reduces the amount of impervious area of the
development (5 points).
2. The applicant will be planting street trees within the parkway between the sidewalk
and back of curb (5 points).
3. Solar subdivision: the subdivision includes 70% or more "solar lots" that have a
minimum north -south dimension of 75 feet and a front line orientation that is within
30 degrees of the true east -west axis (30 points).
Subdivision Staff Report — Preliminary Plat of Orchard Park Subdivision Page 5
Attached to this staff report is a handout on how solar orientation can lower heating
costs.
The proposed subdivision will be required to meet the City's storm water control
regulations and policies. The applicant has indicted there is room to provide two areas
of detention at the east side of the project. Storm water calculations and storm water
control /detention are required as part of the final plat and improvement plans that must
be reviewed and approved by City staff prior to submittal of the final plat to City Council.
Planning staff recommends the Zoning Advisory Commission recommend approval of
the Preliminary Plat of Orchard Park Subdivision subject to waiving the right -of -way and
street width requirements for streets D, E, F, and G. Planning staff would note that
normally preliminary plats are not required to go onto the City Council; however,
because of the request to allow reduced width for several of the streets in the
subdivision, Planning staff recommends that the Preliminary Plat also be reviewed by
the City Council.
Prepared by:
Reviewed: a, /At Date: 3/3///t.
Fire Department
11 West 9th Street
Dubuque, Iowa 52001 -4839
(563) 589 -4160 office
(563) 589 -4209 fax
dbrown @cityofdubuque.org
E. Daniel Brown, Chief
To Whom It May Concern
The Dubuque Fire Department is in strong support of the new street connection between Roosevelt and
Baldwin Drive as part of the Orchard Park subdivision. This connection would improve fire response to
the area as well as giving the fire department a secondary access. We require, when possible, all
subdivisions and developments to have at least two means of access.
Respectfully
Mark Ludescher
Fire Marshal
City of Dubuque Fire Department
THE CITY OF
DUB
3 -11 -2010
Service People Integrity Responsibility Innovation Teamwork
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DEPARTMENT:
Water Department
STATE PROGRAM:
Business Type
PROJECT TITLE:
Water Tower and Water Main Extension/
Roosev oad and Industrial Park West Tow
(stud W
PROGRAM: 8C
DEPARTMENT: 42
FD /CIP NO: 740 -1672
TOTAL
PROJECT
COST
$ 994,868
EXP PRIOR
ESTIMATED
PROJECT BUDGET
2010 -11
2011 -12
2012 -13
2013 -14
2014 -15
BEYOND
TO FY 10
FY 10
2015
A. EXPENDITURE ITEMS
$ 14,000
$ 11,000
Design & Engineering
$ 75,000
$ 50,000
$ 82,800
Land and R.O.W.
$ 32,868
Construction
$ 260,000
$ 469,200
$ 763,000
Other
$ 14,000
$ 43,868
TOTAL
$ -
$ 75,000
$ -
$ 310,000
$ 552,000
$ 763,000
B. PROJECT FINANCING
$ 14,000
$ 18,868
Water Depreciation Fund
$ 25,000
Water GO Bond
$ 75,000
$ 310,000
$ 552,000
$ 763,000
$ 14,000
$ 43,868
TOTAL
$ -
$ 75,000
$ -
$ 310,000
$ 552,000
$ 763,000
PROJECT DESCRIPTION
This project provides for the installation a 12 -inch water main along the north and easterly side of Roosevelt Road from the Eagle Valley Subdivision to Orchard Drive.
This project will require the purchase of a one -acre parcel at an appraised value of $10,500 and additional costs for legal and survey fees to support the construction of a
one million gallon water tower in 2013 to be located along Roosevelt Road. It also includes an 8 -inch water main loop to Amelia Court and the demolition of the Eagle
Point Park water tower after the new water tower is constructed.
JUSTIFICATION
This project is part of an effort to supply water service to all residents within the city limits and for large user needs located in the West Side Industrial Park. This multi-
phase project will provide an alternate source of water to the public in the intermediate system (Roosevelt Road) during emergencies, minimizing the number of
customers out of service. This will also improve water circulation and pressure, and provide service to areas for future development. In addition, this project will focus on
the construction of a new water tower in support of large water user needs within the West Side Industrial Park. This project will be funded in part with a General
Obligation bond issue of $1,525,000 in Fiscal Year 2011. The annual debt service on these issues will be financed with current water revenues plus a two percent rate
increase in Fiscal Year 2011. The rate increase will generate an additional $80,000 in water fees to be used for debt service.
RELATIONSHIP TO OTHER PROJECTS
This project implements the Comprehensive Plan's Infrastructure Element: Goals 1.1, 1.2, 1.3, 11.7, 11.8, and 11.9.
RELATIONSHIP TO SUSTAINABILITY PRINCIPLES
This project implements the Sustainable Principle of Community Design and Clean Water.
200
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DEPARTMENT:
Leisure Services/
Park Division
STATE PROGRAM:
Culture & Recreation
PROGRAM: 4C
DEPARTMENT: 30
FD /CIP NO: 102-
TOTAL
PROJECT
COST
$ 150,000
EXP PRIOR
ESTIMATED
PROJECT BUDGET
2010 -11
2011 -12
2012 -13
2013 -14
2014 -15
BEYOND
TO FY 10
FY 10
2015
A.
EXPENDITURE ITEMS
Design & Engineering
$ 10,000
Land and R.O.W.
Construction
$ 90,000
$ 50,000
Other
$ -
$ -
TOTAL
$
-
$ 100,000
$ 50,000
$
-
$
-
$ -
B.
PROJECT FINANCING
DRA Distribution
$ 100,000
$ 50,000
$ -
$ -
TOTAL
$
-
$ 100,000
$ 50,000
$
-
$
-
$ -
PROJECT DESCRIPTION
This project provides for developing Eagle Valley Park in the Eagle Valley Subdivision between Roosevelt Street and Shiras Avenue.
JUSTIFICATION
The developer has dedicated approximately 2.25 acres of property as a park and storm water detention facility. This project develops the park portion of the property.
The primary service area for this park will be the ninety homes that will be constructed in this subdivision.
RELATIONSHIP TO OTHER PROJECTS
This project implements the Comprehensive Plan's Recreation Element: Goals 1.1 and 1.3.
RELATIONSHIP TO SUSTAINABILITY PRINCIPLES
This project implements the Sustainable Principle of Native Plants & Animals and Community Knowledge.
16
[urn to Solar for Lower Heating Costs
An energy- efficient home isn't complete until it faces the sun. Passive solar design and orientation reduces a home's
heating and cooling costs and provides more spacious, well -lit and comfortable spaces.
For builders and developers, reorienting a new home to take advantage of the warmth of the sun will increase the
home's appeal and marketability. It will provide that extra benefit that makes a home stand out from all the others, an
added sales tool in a competitive market.
Solar Shift
Passive solar orientation places a home on the building site in such a way that the home takes full advantage of the
sun's natural heat. By facing the long side of a home to the south and the short sides to the east and west, the building
will capture solar heat in the winter and block solar gain in the summer. Although it is best to face the home directly
into the sun, it can be oriented up to 30 degrees away from due south and lose only 5 percent of the potential savings.
There are some physical constraints, such as steep lots, shading from buildings and trees, and existing street patterns,
when orienting a home on a lot. However, the 30 degree flexibility makes it much easier for builders to think about
solar orientation when siting a home.
While there is no need to change the house design, moving windows to the home's south side will enhance its solar
performance. If the south - facing window area reaches eight to ten percent of floor area, the home'can be called "sun
tempered."
A full- fledged "passive solar" home has south facing glass area of 15 to 20 percent of floor area. With this much glass,
additional features must be added, such as thermal storage mass and summer shading. Many builders choose to keep
the project simple by sticking to the sun - tempered level.
Solar Performance
Research supports the energy savings claims of passive solar designers. A study by the Bonneville Power
Administration placed home space heating savings between 10 and 20 percent and a study by the City of San Jose,
California estimated savings for cooling costs between 10 and 40 percent. The homes in both these studies were simply
reoriented to the sun and did not include any special solar design features.
It's not surprising that proper orientation increases heat gain in winter and saves money by reducing heating bills.
However, homes with good orientation also save money on summer cooling. The south wall and its windows are
shaded from the high summer sun by the roof overhang.
Large expanses of west - facing glass are responsible for a considerable amount of overheating during spring and fall.
East and west windows are bombarded with solar heat from the low angle sun as it rises and sets. Houses with good
solar orientation also cut cooling costs by reducing wall and window area facing the blistering low angle sun. •
In addition to limiting west - facing window area, you can choose window features that reduce heat gain without
reducing visibility or light transmission. For most situations, windows and patio doors should have a Solar Heat Gain
Coefficient (SHGC) less,. than 0.60 on west - facing walls. Visible light transmission should be no lower than 50 or 60
percent. (See October 1994 for more on window performance.)
Saving energy is only one of the benefits. People are simply more comfortable in a solar home that is full of natural
daylight and open spaces.
Many builders and buyers believe solar site design to be an attractive option because it saves energy and increases the
appeal of a home. Solar- oriented homes are in tune with the interest of many buyers.
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