HomeMy WebLinkAboutWashington Street schematic design
PREPARED FOR CITY OF IOWA CITY
DOWNTOWN IOWA CITY. SCHEMATIC DESIGN . WASHINGTON STREET
December 3, 2014
2 DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
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3DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
UI MAIN CAMPUS
UNIVERSITYCAPITOLCENTRE
UI IOWA AVE
CAMPUS
UI IOWA AVE
CAMPUS
CITY HALL
CHAUNCEYSWAN PARK
IOWA CITY PHASE ONE
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PEDESTRIAN MALL
IOWA AVE
JEFFERSON ST
MARKET STBLOOMINGTON STDAVENPORT ST
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BURLINGTON ST
PUBLIC LIBRARY
PROJECT BACKGROUND
An eclectic mix of unique retail, mature trees,
and wide sidewalks with popular sidewalk cafes
contribute to a thriving pedestrian realm along Washington Street. Notable features include the transit hub at Clinton, the entry to the Pedestrian Mall at Dubuque, eleven historic buildings, civic uses at
the east end, and the popular Englert Theater.
The schematic design attempts to enhance the existing elements by updating and unifying the streetscape components. New pedestrian and
roadway lighting and updated wayfinding elements
are proposed. Infill trees are proposed and planting areas are expanded in an effort to improve the health of the existing, mature tree canopy.
DESIGN PROCESS
The Washington Street Schematic Design Plan
was prepared by a design team led by Genus
Landscape Architects under contract with the City of Iowa City. The design team included ArtHouse Design (wayfinding and identity), Schuler Shook (lighting design), Gary Johnson (certified arborist
from University of Minnesota Department of Forest
Washington Street, 1960.Washington Street at Dubuque Street.
CLIENT COMMITTEE
Geoff Fruin Assistant City Manager
Rick Fosse Director of Public Works
Ron Knocke City Engineer, Public Works
Josh Slattery Civil Engineer, Public Works Jon Resler Supt. of Streets, Traffic Eng., Solid WasteMike Moran Director of Parks and Recreation
Zac Hall Superintendent of Parks and Forestry
Chris O’Brien Director of Transportation Services
Kris Ackerson Assistant Transportation PlannerMark Rummel Associate Director of Transportation ServicesJohn Yapp Transportation Planner
Nancy Bird Executive Director, ICDD
Sheri Thomas Senior Maintenance Worker
Jeff Davidson Economic Development AdministratorShane Schemmel Assoc. Executive Director, Summer of the Arts
Resources), and MMS Consultants (detailed survey of the street and civil engineering). The work was overseen by a Client Committee comprised of members from the City
of Iowa City, and the Iowa City Downtown District (ICDD).
The project benefited from public input and review in late October. The project began in May 2014 and is expected to be completed in November.
This booklet documents the schematic design process
for Washington Street and begins with a summary of the site analyses. During the team’s field work, specific attention was given to the existing tree canopy and the vaults. Upon completion of the site analyses, the team
prepared a framework for the street which considered
parking, travel lane width, and pedestrian zones. Once the framework was identified and approved by the Client Committee, the design team could overlay and consider all of those components that make a street identifiable
and memorable: furnishings, shade trees, unique
lighting, wayfinding element, and paving and crosswalk distinctions. Design options were prepared and reviewed by the Client Committee and incorporated into the final schematic design plan. The booklet concludes with an
analysis of the existing utilities and a summary of the
recommended utility upgrades for the study area.
4 DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
EXISTING CONDITIONS AND SITE ANALYSIS
Initial analysis of Washington Street revealed the existing framework and
constraints within which schematic design was to begin.
Across the two block study area, both diagonal and parallel parking spaces are offered. In the existing configuration, the parking is limited
along the west block, south side. Travel lanes are wider than average at
approximately 14’ in width.
There are approximately thirteen existing vaults across the two block study area and they extend approximately 14’ into the public right-
of-way. Access is afforded via metal access doors at the sidewalk. All
thirteen vaults are currently in use and business owners would like them to remain. Their condition and use varies. A review of design plans provided by the City of Iowa City and dated May 1975 indicates a 4” PCC sidewalk slab over a waterfproofing membrane, over a 7” structural
slab.
Existing trees were evaluated by a certified arborist and rated according to their health and chances of surviving future construction. Trees rated green were listed in good health and appropriate for preservation,
those coded yellow were rated as appropriate to preserve in some
circumstances but will require more care, trees coded with red are either in bad health and should be removed, or not invested in for preservation. Of the existing twenty-seven trees, nine have been coded red.
View west from Dubuque Street intersection.Vault access door on Washington Street.
5DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
PRELIMINARY FRAMEWORK
The suggested framework for Washington Street includes two 11’-wide travel lanes with 9’-wide parallel parking spaces on both sides of the street. The travel
lanes will be shared-use, allowing both vehicular and
bicycle travel. On-street parallel parking has been
maximized and includes four ADA-compliant parking spaces. Some of the parking spaces in each block will be designated as loading spaces during certain hours
of the day. Generous sidewalks range in width from
20’ to 40’. At the intersections, pedestrian movement
is prioritized with bump-outs, or sidewalk extensions, to minimize street-crossing distance.
PRELIMINARY . VIEWING WEST
6 DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
WASHINGTON STREET
WASHINGTON STREET | ‘GREEN ZONE’ CONCEPT JUNE 2014
WASHINGTON STREET
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SCHEMATIC DESIGN OPTION ONE . GREEN ZONE CONCEPT
From the initial framework, two concepts were conceived. The Green Zone concept presents a streetscape with expanded planting areas throughout, providing added shade and visual interest along Washington Street. To maximize the site’s permeability,
permeable unit pavers are proposed at the parking spaces and along the curb to subdivide
the pedestrian zone into a walking zone and an amenity zone. This concept introduces
additional seating nodes and creates several conversational areas along the streetscape.
SCHEMATIC DESIGN OPTION TWO . BLURRED LINES CONCEPT
The Blurred Lines concept aims to introduce a common material
language across Washington Street and the Pedestrian Mall. Drawing
materials, textures, and paving patterns from the Pedestrian Mall out
onto Washington Street creates a visual connection and cohesion between the two streetscapes.
7DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
0 5 10 20
1” = 10’-0”
OCTOBER 28, 2014
GENUS LANDSCAPE ARCHITECTS | SCHULER SHOOK | ARTHOUSE DESIGN | MMS CONSULTANTS
DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
PANCHERO’S
MIDWEST ONE BANK
US BANKM.
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HERTEEN & STOCKER JEWELRY
SUMMARY WEST BLOCK
PARKING 2 ADA, 8 LOADING/PUBLIC, 8 DIAG.BIKE CAPACITY 10 LOCATIONSBENCHES 7TRASH RECEPTACLES 9TREES 10 EXISTING, REMOVE 3
PARKING 2 ADA-COMPLIANT, 20 SPACES* BIKE CAPACITY 20 RACKS (40 BIKES)BENCHES 8TRASH RECEPTACLES 8TREES 21, W/ 7 OF 21 EXISTING
*SOME SPACES TO BE DESIGNATED AS LOADING
EXISTING PROPOSED
SUMMARY EAST BLOCK
PARKING 3 ADA, 5 LOAD/PUBLIC, 12 DIAG.BIKE CAPACITY 6 LOCATIONSBENCHES 7TRASH RECEPTACLES 6TREES 13 EXISTING, REMOVE 2
PARKING 2 ADA-COMPLIANT, 14 SPACES*BIKE CAPACITY 29 RACKS (58 BIKES)BENCHES 7TRASH RECEPTACLES 7TREES 22, W/ 11 OF 22 EXISTING
*SOME SPACES TO BE DESIGNATED AS LOADING
EXISTING PROPOSED 1
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PRECAST PAVERS AT SIDEWALK
CONCRETE STREET
CONCRETE WALKWAY
CONCRETE WALKWAY AT VAULT
EXTENT OF VAULT [TYP.]
TREE PLANTING AREA [TYP.]
BICYCLE RACK [TYP.]
METAL STRAP BENCH, SCARBOROUGH W/ CENTER ARM [TYP.]
TRASH RECEPTACLE, SCARBOROUGH [TYP.]
PARKING METER [TYP.]
PEDESTRIAN LIGHT [TYP.]
PEDESTRIAN AND ROADWAY LIGHTING [TYP.], W/ WIFI ANTENNA, AS INDICATED:
WAYFINDING KIOSK [TYP.]
PLANTER CURB [4” HEIGHT, TYP.]
SIDEWALK CAFE [TYP.]
GFCI RECEPTACLE PEDESTAL [TYP.]
EXISTING TRAFFIC SIGNAL LOCATION, REPLACE W/ NEW POLE PER CITY STANDARD [TYP.]
PROPOSED TRAFFIC SIGNAL LOCATION
MOVEABLE TABLES AND CHAIRS
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PLAN KEY
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0 5 10 20
1” = 10’-0”
OCTOBER 28, 2014
GENUS LANDSCAPE ARCHITECTS | SCHULER SHOOK | ARTHOUSE DESIGN | MMS CONSULTANTS
DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
PANCHERO’S
MIDWEST ONE BANK
US BANKM.C GINSBERG WHITEY’S ICE CREAM MESA PIZZA VACANT - FUTURE RESTAURANT BO JAMES LAW OFFICES OSAKA ZEPHYR PRINTING & DESIGN ONE TWENTY SIX MOONRAKERS JIMMY JOHN’S COLDSTONE LASANSKY CORP GALLERY CHAIT GALLERY DOWNTOWN BEADOLOGY IA /THE PAPER NEST
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HERTEEN & STOCKER JEWELRY
SUMMARY WEST BLOCK
PARKING 2 ADA, 8 LOADING/PUBLIC, 8 DIAG.BIKE CAPACITY 10 LOCATIONSBENCHES 7TRASH RECEPTACLES 9TREES 10 EXISTING, REMOVE 3
PARKING 2 ADA-COMPLIANT, 20 SPACES* BIKE CAPACITY 20 RACKS (40 BIKES)BENCHES 8TRASH RECEPTACLES 8TREES 21, W/ 7 OF 21 EXISTING
*SOME SPACES TO BE DESIGNATED AS LOADING
EXISTING PROPOSED
SUMMARY EAST BLOCK
PARKING 3 ADA, 5 LOAD/PUBLIC, 12 DIAG.BIKE CAPACITY 6 LOCATIONSBENCHES 7TRASH RECEPTACLES 6TREES 13 EXISTING, REMOVE 2
PARKING 2 ADA-COMPLIANT, 14 SPACES*BIKE CAPACITY 29 RACKS (58 BIKES)BENCHES 7TRASH RECEPTACLES 7TREES 22, W/ 11 OF 22 EXISTING
*SOME SPACES TO BE DESIGNATED AS LOADING
EXISTING PROPOSED 1
2
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17
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PRECAST PAVERS AT SIDEWALK
CONCRETE STREET
CONCRETE WALKWAY
CONCRETE WALKWAY AT VAULT
EXTENT OF VAULT [TYP.]
TREE PLANTING AREA [TYP.]
BICYCLE RACK [TYP.]
METAL STRAP BENCH, SCARBOROUGH W/ CENTER ARM [TYP.]
TRASH RECEPTACLE, SCARBOROUGH [TYP.]
PARKING METER [TYP.]
PEDESTRIAN LIGHT [TYP.]
PEDESTRIAN AND ROADWAY LIGHTING [TYP.], W/ WIFI ANTENNA, AS INDICATED:
WAYFINDING KIOSK [TYP.]
PLANTER CURB [4” HEIGHT, TYP.]
SIDEWALK CAFE [TYP.]
GFCI RECEPTACLE PEDESTAL [TYP.]
EXISTING TRAFFIC SIGNAL LOCATION, REPLACE
W/ NEW POLE PER CITY STANDARD [TYP.]
PROPOSED TRAFFIC SIGNAL LOCATION
MOVEABLE TABLES AND CHAIRS
1
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3
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5
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9
13
10 11
12 14 16
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15 19
PLAN KEY
A’
A
B’
B
0 5 10 20
1” = 10’-0”
OCTOBER 28, 2014
GENUS LANDSCAPE ARCHITECTS | SCHULER SHOOK | ARTHOUSE DESIGN | MMS CONSULTANTS
DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
PANCHERO’S
MIDWEST ONE BANK
US BANKM.
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HERTEEN &
STOCKER JEWELRY
SUMMARY WEST BLOCK
PARKING 2 ADA, 8 LOADING/PUBLIC, 8 DIAG.BIKE CAPACITY 10 LOCATIONSBENCHES 7TRASH RECEPTACLES 9TREES 10 EXISTING, REMOVE 3
PARKING 2 ADA-COMPLIANT, 20 SPACES* BIKE CAPACITY 20 RACKS (40 BIKES)BENCHES 8TRASH RECEPTACLES 8TREES 21, W/ 7 OF 21 EXISTING
*SOME SPACES TO BE DESIGNATED AS LOADING
EXISTINGPROPOSED
SUMMARY EAST BLOCK
PARKING 3 ADA, 5 LOAD/PUBLIC, 12 DIAG.BIKE CAPACITY 6 LOCATIONSBENCHES 7TRASH RECEPTACLES 6TREES 13 EXISTING, REMOVE 2
PARKING 2 ADA-COMPLIANT, 14 SPACES*BIKE CAPACITY 29 RACKS (58 BIKES)BENCHES 7TRASH RECEPTACLES 7TREES 22, W/ 11 OF 22 EXISTING
*SOME SPACES TO BE DESIGNATED AS LOADING
EXISTINGPROPOSED 1
2
3
4
5
6
7
8
9
10
11
12
13
14
17
16
15
18
19
PRECAST PAVERS AT SIDEWALK
CONCRETE STREET
CONCRETE WALKWAY
CONCRETE WALKWAY AT VAULT
EXTENT OF VAULT [TYP.]
TREE PLANTING AREA [TYP.]
BICYCLE RACK [TYP.]
METAL STRAP BENCH, SCARBOROUGH W/ CENTER ARM [TYP.]
TRASH RECEPTACLE, SCARBOROUGH [TYP.]
PARKING METER [TYP.]
PEDESTRIAN LIGHT [TYP.]
PEDESTRIAN AND ROADWAY LIGHTING [TYP.], W/ WIFI ANTENNA, AS INDICATED:
WAYFINDING KIOSK [TYP.]
PLANTER CURB [4” HEIGHT, TYP.]
SIDEWALK CAFE [TYP.]
GFCI RECEPTACLE PEDESTAL [TYP.]
EXISTING TRAFFIC SIGNAL LOCATION, REPLACE
W/ NEW POLE PER CITY STANDARD [TYP.]
PROPOSED TRAFFIC SIGNAL LOCATION
MOVEABLE TABLES AND CHAIRS
1
1
2
2
3
4
6
5
7
8
9
13
1011
121416
17
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15 19
PLAN KEY
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B’
B
FINAL SCHEMATIC DESIGN PLAN
8 DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
FINAL SCHEMATIC DESIGN PLAN
The preferred plan is a refinement of the previous Green Zone concept. This plan
introduces a streetscape with expanded planting areas around new and preserved
street trees. The intent is to improve the overall health of the tree and to accommodate
colorful shrub and groundcover plantings at the base of the trees. Tree pits are designed with planter curbs to protect plantings and gaps within the curbs enable surface drainage to flow into the planting areas. As follow-up to the public comments
offered during the October public open house, the width and length of each proposed
planter will be studied and refined during subsequent design phases. The planter
dimensions will consider vaults, storefronts, circulation, and on-street parking.
The schematic design updates and unifies the streetscape components. All new
pedestrian and roadway lighting has been introduced. The light poles have been customized with arms to recall the dome and cornice seen on the Old Capitol. Three new wayfinding kiosks are proposed. The centerpiece of the wayfinding kiosk is the
recurring “screen” of metal text in various languages. Bicycle parking and seating is also
enhanced with new bike racks and new metal strap benches along the streetscape. A
concentration of bicycle parking is proposed at the north entry to the Pedestrian Mall.
Surfacing improvements include new concrete sidewalks, ADA-accessible curb ramps,
and curb extensions. Alternating banding of concrete with varied scoreline modules provide rhythm to the streetscape and highlights new pedestrian and roadway lighting locations. Along the sidewalks, grades will be adjusted to the extent possible to provide
ADA-compliant access to the threshold of existing buildings. Unit pavers are proposed
at the intersections to prioritize pedestrian crossing safety. Concrete is proposed as the
roadway surface to better weather the long-term wear and tear from vehicles.A-A’ Final Section at West Block . Viewing West
B-B’ Final Section at East Block . Viewing West
9DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
A new flexible program space is created at Englert Theater with expanded sidewalks and varied seating types to support performances before and after the shows.
Generous sidewalks support expanded planting pits, sidewalk cafes, and seating nodes.
10 DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
The schematic design proposes all new concrete paving at the sidewalks and street and new streetscape
furnishings including pedestrian lighting, wayfinding kiosks, bicycle racks, and seating clusters.
11DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
LIGHTING Custom detailing of the new pedestrian and roadway lighting is inspired by the dome and cornice of the old state capitol.
BENCHES - 6’ LENGTH W/ CENTER ARMSCARBOROUGH, LANDSCAPE FORMS TRASH RECEPTACLESCARBOROUGH, LANDSCAPE FORMS
BIKE RACK
BOLA, LANDSCAPE FORMS
MOVEABLE TABLES + CHAIRSBISTRO COLLECTION, FERMOB
WAYFINDING KIOSKS The centerpiece of this wayfinding family is the recurring “screen” of metal text in various languages. The signage elements feature metal structures atop a precast base. The text screen is comprised of a single sheet of metal with internal LED
illumination. The map components are illuminated from within, and the text screens receive
subtle internal illumination.
RECYCLING SYSTEM
BIG BELLY RECYCLING SYSTEMS
LIGHTING AND SITE FURNISHINGS
12 DOWNTOWN IOWA CITY . SCHEMATIC DESIGN . WASHINGTON STREET
WATER MAIN RELOCATION/REPLACEMENTAlong Washington Street from Clinton Street to Linn Street is an existing 12-inch ductile iron water main installed in 1975. The main has had several significant breaks causing loss of service and requiring emergency repairs. Replacement of this pipe is desired by the
City as part of the proposed improvements. Because the downtown area was originally constructed many years ago, precise records of water services are not available. Available records indicate there are a mix of 2-inch and smaller services, some of which are possibly lead pipe, and several 4-inch and
larger services providing fire protection, and in some cases smaller service taps. Based on records and water boxes located in the field, there are approximately 10 2-inch or smaller, and seven 4-inch or larger service connections in the 100 block of Washington. In the 200 block of Washington five 2-inch or smaller and five 4-inch or larger are indicated. An allowance should be made for unknowns related to water services.
Where new mains will be installed they will be placed, disinfected and tested while maintaining the existing system in service. Once approved, individual service connections will be installed. Once all customers are connected to the new line, the old main will be abandoned in place. Reconnection of the services to the new main
will likely be completed during evening or weekend hours to minimize disruption to customers. Stop boxes are preferred to be set in the sidewalk area but may be placed in the street where necessary. Places such as parking stalls or other areas that might be inaccessible to city workers should be avoided.
Typical city policy provides that for 2-inch services and smaller new saddles, corporations, curb stops/stop boxes, and new copper from the corporation to the stop box will be installed. For services 4- inches and larger, a new valve is installed and the line is reconnected to the existing line at a reasonable distance to the new valve. Service line upgrades outside these limits are the responsibility of the customer, and their plumbing
contractor may coordinate replacement with the City during construction. However during the Iowa Avenue Streetscape Project, all services were replaced at project expense from the main to the meter. For schematic design purposes, the replacement of services from main to meter is assumed. Portions of the project are within a Leaking Underground Storage Tank (LUST) buffer zone. This may require the use of nitrile
gaskets and/or other measures to meet regulatory requirements. Soil sampling may be warranted during design development to determine the proper measures.
In the westerly block from Clinton to Dubuque the water main is recommended to
be placed five feet northerly of and generally parallel to the existing water main. The recommended diameter is 12-inches, the same as existing. Again, because of existing service leads 4-inches and larger in diameter, the proposed main may need to be placed at a lower elevation in some locations in order to maintain service during construction. Connection to the existing water will be to a 12-inch ductile iron main
(installed in 1979) in the Clinton Street intersection. Connection to the 10-inch main on Clinton will also be made. At the Dubuque intersection connections to the Phase 1 water mains and a 10-inch line to the south Washington ROW will be installed. This 10-inch line will allow for future water main replacement within the Ped Mall without disturbing Washington Street amenities.
East of Dubuque the main is proposed to be located 10 feet north of the existing sanitary sewer. Locating the proposed main 10 feet south of the sanitary (five feet north of the existing main) would place it in conflict with some of the proposed amenities along the south side of Washington Street. At the Linn Street intersection the proposed 12-inch
main will connect to the existing 16-inch main. Along Washington Street three hydrants will be replaced, one in its current location, and two relocated less than 10 feet to
preserve existing spacing. The design team received approval from the City on the removal of the two mid-block hydrants.
STORM SEWER CAPACITY ANALYSISEach sewer reach was analyzed for the five-year recurrence. Video of the sewers was reviewed to identify the many roof drain connections in order to establish the contributing drainage areas. Analysis shows that the existing storm sewer, except where
noted below, has sufficient capacity for the five year storm event.
The downstream terminus of the Washington Street storm sewer begins at a drainage manhole in the intersection of Washington and Linn Streets. A 24-inch diameter pipe runs west approximately 18 feet south of the northerly right of way to a manhole in the
northeast sidewalk at the Washington/Linn intersection with connections to intakes on Washington Street. From there the 24-inch pipe continues west to a drainage manhole in the northeast quadrant of the Dubuque intersection. Along this line there is a buried manhole in the planter near U.S. Bank. From the northeast quadrant of Dubuque twin 18-inch diameter pipes continue west to the manhole identified in the Dubuque Street
narrative above as the downstream terminus of the Dubuque sewer. From there a
21-inch diameter pipe runs to Clinton Street. As with the upstream terminus of the Dubuque sewer, this structure will likely be located in the proposed curb line and similar adjustments may be necessary. Intakes at the intersections of Dubuque and Linn will be reconstructed to align with the proposed curb line and short runs of 12-inch and 15-inch sewer will be required to reconnect the intakes to the main line.
Approximately 82 feet from the drainage manhole at the northeast corner of Washington and Dubuque video shows what appears to be the remnant of a pipe penetration(it is located in the planter near the U.S. Bank entrance). While it may have been repaired in the past, the images are inconclusive. During construction this should be investigated
further and repaired if necessary.
CITY OWNED FIBER, TRAFFIC CONTROL, AND ELECTRICALThe City wishes to include conduit during construction to provide for fiber optic and traffic control installation. The proposed conduit runs are (3) 2-inch SDR 11 HDPE. A 24-
inch access near the intersections of Iowa/Dubuque, Clinton/Washington, Dubuque/Washington, and Linn/Washington will be installed. From the Linn Street intersection a directionally drilled extension to the yard area at the senior center was requested by City staff.
The contemplated placement for schematic design is within the roadway and in the northerly (westbound) lane along Washington Street and in the easterly (northbound lane) along Dubuque Street. Runs of single 2-inch conduit would run from the access structures to traffic control panels and to approximately five light poles to provide connection for future wireless antennae. The depth would be 36 to 49 inches. The
flexibility in locating conduit allows for adjustments to be made during final design and construction drawing preparation, and be coordinated with gas and electric relocations.
PRIVATE UTILITIES
Discussions regarding replacement and upgrades to private gas, electric and telecommunication utilities have been initiated. Further work with these entities will take
place during design development.
UTILITY ANALYSIS