CHRISTENSEN BROTHERS GENERAL ENGINEERING, INC. (2)

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REQUEST FOR COUNCIL ACTION CITY COUNCIL MEETING DATE: APRIL 15, 2014 TITLE: H CONTINGENCY INCREASE FOR BROADWAY REHABILITATION AND WATER MAW IMPROVEMENTS FROM CIVIC CENTER DRIVE TO SANTA CLARA AVENUE (PROJECTS 11116743 & 116415) CITY MANAGE RECOMMENDED ACTION CLERK OF COUNCIL USE ONLY: APPROVED, oy-AI' Idl I As Recommended o? ,3, ❑ As Amended ❑ Ordinance on 1" Reeding ❑ Ordinance on 2ntl Reading ❑ Implementing Resolution ❑ Set Public Hearing For CONTINUEDTO Increase the contract contingency for the Broadway Rehabilitation and Water Main Improvements Project by $650,000, which increases the Christensen Brothers General Engineering, Inc., construction contract to a maximum of $5,383,144.65. 2. Authorize the City Manager to execute change orders in an amount not to exceed the total authorized contract. DISCUSSION The recommended action will allow the City to cover cost extras anticipated on Broadway north of 17th Street similar to those conditions encountered south of 17th Street. These cost extras are related to underground and pavement conditions on Broadway that were unforeseen. The Broadway Rehabilitation Project consists of upgrades and /or replacement of underground utilities, including the city's water main and water services, followed by street improvements including replacement of curb and gutter, removal and replacement of damaged sidewalks and curb ramps, and reconstruction of the pavement. The work limits on Broadway are between Civic Center Drive and Santa Clara Avenue. On August 5, 2013, the City Council awarded a contract to Christensen Brothers General Engineering, Inc., in the total amount of $4,733,144.65, which included a 10 percent contingency. While potholing the existing utilities in advance of installing the new water main along Broadway, unforeseen concrete pavement was encountered beneath the street, despite coring logs that showed cement treated base at certain locations. Staff also discovered that a sewer trench constructed in the late 1960's was not properly compacted, causing significant voids under the concrete pavement. Consequently, these unforeseen conditions resulted in necessary redesign and additional quantities of asphalt to pave the street.