R2007-218 AUTHORIZING ADDENDUM - Laserfiche WebLink

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, Engineering & Infrastructure Memorandum NO. 2007-66 November 8, 2007 TO: Honorable Mayor Osborne and City Council FROM: Steve Gar , City Manager �(�-� � � Richard G rle P.E. Director for En ineer &lnfra�fri� ture Y� , 9 9 Aaron M. L son, P.E., Assistant City Engi�n� ; SUBJECT: Nickey Avenue Storm Drainage Improvement /4�ldendum City Project 07-14 SUMMARY RECOMMENDATION: It is recommended by staff that City Council approve the attached resolution authorizing an addendum to the Nickey Avenue Storm Drainage Improvements Project, City Project 07-14, in the amount of$55,000 to add the following work items to the project: 1. Storm sewer construction along Oak Street near Lake Shore Drive at a cost of $40,000. 2. Concrete inlets, gutter, driveway pavement and outlets along White Street near Lake Shore Drive at a cost of$15,000. The resolution authorizes the existing $450,000 contract with Barr & Robison Sewer and Excavating Company to be increased by $55,000 to a maximum of$505,000 to pay for the additional work. BACKGROUND: On August 7, 2006, the City Council authorized a contract in the amount of$417,783 with Barr & Robison Sewer and Excavating Company to build the Nickey Avenue Storm Drainage Improvements Project. At that time, staff requested, and was granted, an additional $32,217 as a project contingency for a total of$450,000. The contingency was requested due to the unknowns involved with constructing underground storm sewer within tight utility constraints in and around resident's yards. During construction, several unknown utilities have been encountered and additional costs have resulted. City staff has been able to keep the project cost within the original awarded amount without using the contingency through a combination of re-designs and ' deleting small items of work. The project is about 80% complete and barring unforeseen circumstances, the project is expected to be completed within the original awarded amount. The additional amount requested is $55,000 over the $450,000 amount originally authorized by council for the project. During project design, several additional drainage improvements were considered. These improvements included: 1. Storm sewer construction along Oak Street near Lake Shore Drive at an estimated cost of $40,000. 2. Concrete inlets, gutter, driveway pavement and outlets along White Street near Lake Shore Drive at an estimated cost of$15,000.