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CITY COUNCIL AGENDA ITEM NO. 17

Meeting Date: February 13, 2001

Subject/Title: Design Change Orders for Sand Creek Road, CIP Project No. 336-3061

Submitted by: John Stevenson/S. Gronlund

Approved by: Jon Elam, City Manager


RECOMMENDATION
Authorize the City Engineer to execute a Design Contract Change Order with Carlson, Barbee & Gibson, Inc. (CBG) in an amount not to exceed $106,144 for the Sand Creek Road (Central) Project (CIP Project No. 336-3061) in an amount not to exceed $106,144; and authorize the City Engineer to execute a Design Contract Change Order with Mark Thomas & Company Inc. (MT&Co) in an amount not to exceed $150,500 for the Sand Creek Road (East) Project, (CIP Project No. 336-3061).

PREVIOUS ACTION
On September 14, 1999 by Resolution No. 99-203, City Council authorized the City Engineer to sign professional engineering design contracts with Mark Thomas & Co. Inc. for $292,126 for the design of Sand Creek Road (East), east of the Union Pacific Railroad Crossing east to Sand Creek/O'Hara Loop.

On October 12, 1999 by Resolution No. 99-227, the Council authorized the City Engineer to sign a professional engineering design contract with Carlson, Barbee & Gibson, Inc. for $390,500 for the design of Sand Creek Road (Central), Fairview Avenue east to the Union Pacific Railroad Tracks.

On October 10, 2000 the Council authorized the City Manager to execute a Design Contract Change Order with Carlson, Barbee & Gibson, Inc. (CBG) in an amount not to exceed $51,268 for Sand Creek Road (Central), CIP Project No. 336-3061.

BACKGROUND
Sand Creek Road (Central) designed by CB&G (Fairview Avenue to the Railroad Tracks)
As of October 10, 2000, the City increased the original scope of work and issued a design change order to CB&G. However, after that date, it was determined that in order to secure the construction for this summer, the City needed to have a parallel design track due to United States Fish and Wildlife Servicesí refusal to grant the City the requested permits for current projects. Although CB&G has already designed a box culvert extension for the existing box culvert in Sand Creek at Fairview Avenue, City staff gave CB&G direction to design a free-spanned bridge in order to avoid the necessity for permits and therefore start construction this summer. The additional design expense is $106,144.

Sand Creek Road (East) designed by MT&Co (Railroad Tracks to Sand Creek/O'Hara Loop)
The City of Brentwood has also expanded the original scope of work for MT&Co. Since this new roadway will cross an existing, well-utilized pedestrian trail, the City added the construction of pedestrian undercrossings to the design. This design change was complex since the inclusion of the undercrossings affected the roadway vertical profile, location of utilities, drainage issues, need for retaining walls and sump pump, and increased right-of-way issues. These undercrossings will be paid from the contingency category of Roadway Fees.

Also, the City increased the right-of-way services to include alignment study and preparation of documents for the extension of O'Hara Avenue beyond Marsh Creek to "old" Sand Creek Road. This was done at the request of the residential property owners adjacent to the future O'Hara Avenue extension.

Additional improvements have been added to the project, such as the design of a soundwall for the residential property owners north of Marsh Creek. This noise mitigation measure was called for in the adopted Mitigated Negative Declaration of this project. The City will also construct a sewer line under the creek to provide a needed sewer connection from the west side of Marsh Creek to the existing sewer line east of the creek, which will be a benefit for the future commercial properties. Furthermore, in order to comply with Citywide National Pollution Discharge Elimination System (NPDES) the City requested the engineers to design for the pretreatment of storm water drainage, especially for de-silting the agricultural runoff.

Finally, similar to the Sand Creek Road (Central) Project, the City directed the engineers to redesign the Sand Creek Road (East) Project for a free-spanned bridge in order to avoid the necessity for regulatory permits and keep with this summer's construction schedule. The total cost for MT&Co's design changes is $150,500.

The funds for both of these change orders will come from the Development Roadway Fee Account.

Attachments:
Site Map
Change Order Requests

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