HomeMy WebLinkAboutTrans 2012-10-01 Item 2B - 42nd Avenue South Phase III Utility UndergroundingCity of Tukwila
Jim Haggerton, Mayor
INFORMATIONAL MEMORANDUM
TO: Mayor Haggerton
Transportation Committee
FROM: Bob Giberson, Public Works Director
BY: Cyndy Knighton, Senior Engineer
DATE: September 28, 2012
SUBJECT: 42nd Ave S Phase III (Southcenter Blvd S 160 St)
Project No. 99410303
Utility Undergrounding
ISSUE
Utility undergrounding as part of the 42nd Avenue S Phase III project.
BACKGROUND
In February 2012, CH2MHill was retained by the City to design the 42nd Avenue S Phase III project. Limits of this phase are
Southcenter Boulevard south to S 160" Street (southern City limits) and the road project includes the design of a failing culvert
over Gilliam Creek. The scope of work includes full design for both the roadway improvements and the culvert replacement, up
to and including support during bidding. The current scope and budget do not include the costs to convert overhead power and
phone lines to underground vaults. Optional tasks are included in the existing scope but additional budget will be needed to
complete the underground engineering. The estimated cost for the additional design for undergrounding is estimated at
$72,700.00.
DISCUSSION
One of the consultant's first order of work was to study the costs of the utility undergrounding so a decision could be made by
the City on whether or not to pursue utility undergrounding or leave the utilities above ground on aerial lines. Approximately
one -third of the project limits already have undergrounded utilities, which were completed by Sound Transit as part of the Light
Rail line construction.
Fiscal Impact: Design work for the roadway is budgeted in the
draft 2013 CIP at $650,000.00 (pg. 2). Design for the overhead
utility conversion will require additional budget. The road
construction budget is currently $2.9 M (shown in 2014,
including construction management). Undergrounding utilities
will require additional funds. Options for funding the
underground conversion include: (1) General fund; (2) Local
Improvement District; (3) Citywide Utility Rate basing; and (4)
Grants. If no undergrounding is pursued, the poles will still
need to be relocated but at Seattle City Light's expense.
Planning Level Cost Estimate
Roadway Construction
$2,790,000
Gilliam Creek Culvert
940,000
Sub -Total without
$3,730,000
Undergrounding
Utility Undergrounding
$1,750,000
Total Including
$5,480,000
Undergrounding
An LID would affect approximately 25 parcels, whereas citywide utility rate basing would allocate the costs to all residents and
businesses within Tukwila that are served by Seattle City Light. However, at this time utility rate basing is not available to
Tukwila unless the current franchise agreement is amended, a new franchise is negotiated, or a project specific project
agreement is negotiated. Many grant sources, such as the Transportation Improvement Board, disallow most or all of the cost
of utility undergrounding.
RECOMMENDATION
The Council is being asked to authorize staff to negotiate a project specific agreement with Seattle City Light that stipulates that
the utility undergrounding costs for the 42 Ave S Phase III project will be rate based, and consider this item at the October 8,
2012 Committee of the Whole meeting and subsequent October 15, 2012 Regular Meeting.
Attachments: Draft 2013 CIP page 2
Overhead to Underground Relocation Cost Estimate Funding Fact Sheet
W:1PW EnyiPROJECTSW- RW RS Projectst42nd Ave S Phase III (99410303 94- RS03)tINFORMATION MEMO Undergrounddng Decision 9- 18- 12.docx
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CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2013 2018 Capital Improvement Program 2.
A
10
2013 to 2018
PROJECT:
40 -42 Ave South (S 160 St S 131 PL) Project No. 99410303
DESCRIPTION:
Design and construct street improvements, drainage, undergrounding, and driveway adjustments.
JUSTIFICATION:
Provide pedestrian and vehicle safety, drainage, and neighborhood revitalization.
STATUS:
Phase III (SIC Blvd (154th) S 160 St) $3m, Design in 2012, construction in 2014. Project No. 94 -RS03
Phase I (SIC Blvd (154) S 144 St) $3,796, Completed. Project No. 90 -RW15
Phase II (S 144 St S 139 St) $1,850, Completed. Project No. 94 -RS02
Phase IV (S 139 St S 131 PI) $1 m in beyond. Project No. 94 -RS01
MAINT. IMPACT:
Reduce pavement, shoulder, and drainage work.
COMMENT:
Only Phase III is showing in active years. Design contract with CH2M Hill includes Surface Water's Gilliam
Creek
42nd Ave S Culvert project (pg. 146).
FINANCIAL
Through Estimated
(in $000's)
2011 2012 2013 2014 2015 2016 2017 2018 BEYOND
TOTAL
EXPENSES
Phase IV
Design
9 391 250
650
Land(R/W)
100
100
Const Mgmt.
400 560
960
Construction
2,400 3,800
6,200
TOTAL EXPENSES
9 391 250 2,900 0 0 0 0 4,360
7,910
FUND SOURCES
Awarded Grant
0
Proposed Grant
0
Motor Vehicle Tax
160 262 265
687
Mitigation Expected
0
City Oper. Revenue
9 231 (12) 2,635 0 0 0 0 4,360
7,223
TOTAL SOURCES
9 391 250 2,900 0 0 0 0 4,360
7,910
2013 2018 Capital Improvement Program 2.
A
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42nd Avenue S
Funding Fact Sheet
General Fund
The general fund would be responsible for the entire $1,750,000 undergrounding costs.
Local Improvement District
A local improvement district could be formed for all Specially Benefitted parcels. In this case, the
assumption is approximately 25 parcels would receive special benefit by the undergrounding. All
parcels are zoned either for single family (LDR) or multi family (HDR).
Assumptions
All parcels share in bL
Undergrounding cost
LID Formation cost
LID Bondina cost
irden equally
$1,750,000.00 Interest Rate 5
$105,000.00 Amortization 15 years
$140,000.00 Parcels 25
$1,995,000.00
LID Cost Per Parcel $115,321.72 (estimate)
LID Cost Per Parcel Per Year $7,688.11
Citv -wide Rate basing
If an LID is formed to underground the overhead utilities, a surcharge rate is added to all electrical bills w
Assumptions
Residential Meters
Commercial Meters
Industrial Meters
Large General Service Meters
Annual amoritized cost
Cost per kilowatt hour
Average residential
Total residential
Average non residential
Total non residential
Average Annual Costs
Residential
Commercial
4,748
804
16
64
$124,167
$0.00021556
Interest Rate
Amortization
2013 MWH
Average kWh cost
18,500 kWh per year
87,838 MWH per year
552,249 kWh per year
488,188 MWH per year
Per Meter Total
$3.99 $18,934
$119.04 $105,233
5
25 years
576,026 (projected)
$0.06
6/11/12
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