23A - APRV INCREASE WALNUT PUMP STATION

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REQUEST FOR COUNCIL ACTION CITY COUNCIL MEETING DATE: NOVEMBER 21, 2017 TITLE: APPROVE CONTINGENCY INCREASE FOR WALNUT PUMP STATION UPGRADES TO COVER UNFORESEEN COSTS (PROJECT: 11-6412) (STRATEGIC PLAN NO. 6, 1C} CI MANAGER RECOMMENDED ACTION CLERK OF COUNCIL USE ONLY: APPROVED ❑ As Recommended ❑ As Amended ❑ Ordinance on 1� Reading ❑ Ordinance on 2nd Reading ❑ Implementing Resolution ❑ Set Public Hearing For CONTINUED TO FILE NUMBER Approve a contingency increase of $250,000 for construction of the Walnut Pump Station Building Upgrade, to cover costs related to unforeseen conditions encountered during construction. DISCUSSION The City of Santa Ana operates several water wells and pump stations to produce and distribute potable water for consumption by Santa Ana residents and businesses. One of the primary pump stations is the Walnut Pump Station located at 723 West Walnut Street (Exhibit 1). Since 1956, this pump station has pumped well water from the First Street Reservoir which is hidden from view and located underground. Rehabilitating this facility has become very important to ensure water quality and reliability. On the September 20, 2016, City Council awarded a contract to Arnaz Engineering Contractors, Inc. in the amount of $3,596,000 to construct the Walnut Pump Station Building Upgrade project. The City Council also authorized a total estimated project delivery cost of $4,854,600, which included the contract base amount, administration, inspection, testing, and $899,000 contingency. Staff recommends adding $250,000 to the project contingency to ensure the project continues and is completed without interruption. As explained below, unforeseen conditions have impacted the cost of the project. Construction is far enough along, however, that new unforeseen conditions are not likely. The scope of work for the Walnut Pump Station Building Upgrade project involved replacing the aging building, and mechanical, electrical, piping, and plumbing systems on the surface. Other improvements include new fencing, concrete practice tennis wall, a carport, asphalt paving, drainage, drought -tolerant landscaping, and miscellaneous site improvements. While the scope of the construction contract consisted of the demolition of the entire facility, the underground piping, header, valves, pumps, and motors were to remain. However, during demolition of the building and site, several issues arose that needed immediate attention. The existing five discharge pumps, motors, and appurtenances in line to the discharge header were in poor shape, not salvageable, and required replacement. The cost of this change significantly impacted the construction contingency. 23A-1