HomeMy WebLinkAboutTrans 2015-07-06 Item 2B - Amendment 1 - Interurban Avenue South with DGK Inc., Widener & AssociatesCity of Tukwila
Jim Haggerton, Mayor
INFORMATIONAL MEMORANDUM
TO: Mayor Haggerton
Transportation Committee
FROM: Bob Giberson, Public Works Director.
BY: Robin Tischmak, City Engineer
DATE: July 2, 2015
SUBJECT: Interurban Ave South (S 143rd St to Fort Dent Wav)
Project No. 90310402, Contract No. 14 -111
Amendment No. 1, Construction Management - Environmental Compliance
ISSUE
Execute Contract Amendment No. 1 with DGK Inc., dba Widener & Associates, to monitor environmental
compliance during construction of the Interurban Ave S roadway improvement project.
BACKGROUND
The Interurban Ave S project is in the final phase of constructing improvements to the entire corridor
between 42nd Ave S and 1 -405. The improvements will include curbs, gutters, sidewalks, illumination, storm
drainage, street reconstruction, and other urban roadway improvements. Several environmental permits
were required for construction, including a Shoreline Permit, NPDES, and a King County Sewer Discharge
Permit.
Each environmental permit included certain conditions that were required to be met as well as regular
monitoring and reporting of activities. Widener & Associates provided support for obtaining the permits and
have and will continue to monitor compliance during construction.
ANALYSIS
Construction activities have exposed contaminated groundwater and soils that have specific requirements
for disposal. The contaminants have caused the contractor to modify construction methods. The original
contract with Widener & Associates did not include coordination efforts to deal with contaminated materials,
but they have the expertise and experience to assist City staff in this effort. Contract Amendment No. 1,
including the scope of work and an estimate of fees, has been prepared to perform the additional
compliance monitoring to dispose of contaminated materials properly.
BUDGET AND BID SUMMARY
Contract Amendment No. 1 with Widener & Associates is for $37,280.09, making the total contract amount
$73,019.29. The $1,139,675.00 contingency will be used for this Amendment and to date, after this
amendment, there is a balance of $363,571.80.
RECOMMENDATION,
Council is being asked to approve Contract Amendment No. 1 with DGK, Inc. in the amount of $37,280.09
for construction management environmental compliance support and consider this item on the Consent
Agenda at the July 20, 2015 Regular Meeting.
Attachment: Contract Amendment No. 1
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W:1PW Eng1PROJECTSW- RW & RS Projectsllnterurban Ave S (90310402)1Into Memo Widener Amd #1 07-02-15 gl - sb.docx
City of Tukwila
6200 Southcenter Boulevard, Tukwila WA 98188
Agreement Number:
CONTRACT FOR SERVICES
Amendment # 1
Between the City of Tukwila and DGK Inc., Widener & Associates
That portion of Contract No. 14 -111 between the City of Tukwila and
DGK Inc.; Widener & Associates is amended as follows:
Article 2. Scope of Services, shall be supplemented with the following:
The Consultant agrees to perform the services, identified on Exhibit `A" attached hereto,
including the provision of all labor, materials, equipment and supplies.
Article 4. Payment, shall be modified as follows:
A. Payment for the work provided by the Consultant shall be made as provided on
Exhibit `B "attached hereto, provided that the total amount of payment to the Consultant
for this work shall not exceed $37,280.09 without express written modification of the
Agreement signed by the City. -- The new total contract shall not exceed $73,019.29
without express written modification of the Agreement signed by the City.
All other provisions of the contract shall remain in full force and effect.
Dated this
day of , 20
CITY OF TUKWILA CONTRACTOR
Jim Haggerton, Mayor Printed Name/Title:
ATTEST /AUTHENTICATED APPROVED AS TO FORM
City Clerk City Attorney
CA: 2012
Page 1 of 1
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Exhibit "A"
Construction Support
Interurban Avenue Project
Contamination Remediation
Scope of Work
This supplement scope of work provides for the environmental compliance testing and
monitoring on the contamination. The included the following tasks:
•...Coordination with King County Metro to increase discharge rates and
contaminate concentration limits as needed.
• Provided for the testing and monitoring of the vault site.
• Coordination of the test results with King County and complete the reporting
requirements.
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Environmental
Cost Estimate
Exhibit B
Project Name Interurban Construction Support
Client City of Tukwila %Robin Tischmak
Location Interurban Blvd. Tukwila Date 5/26/2015
Project
Manager
Project
Biologist
Hours
Hours
Task 1 Site Contamination • ,
79.5
36.5
Task 2 Additional Site contamination & utilty coordination
40
20
- Total hours
119.5
56.5
Summary
Hours
Rate*
Cost
Project Manager
119.5
$140.00
$16,730.00
Project Biologist
56.5
$86.80
$4,904.20
Total Labor
$21,634.20
Outside Services ( testing)
$15,645.89
TOTAL ESTIMATED COST
$37,280.09
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