04 - Laserfiche WebLink

a change order known as a "balancing change order" is written that adjusts the contract amount to the actually constructed amount. Although the balancing change order has not yet been written for this project, work is nearly complete and it is estimated that the balancing change order will result in a credit of approximately $1,000,000 of Loan and Grant funds that will then be available to construct additional recycled water infrastructure, provided the additional work is found eligible for Loan and Grant funding. Combining the above three numbers, there is a total of $2,532,000 in Loan and Grant funding currently available to construct eligible recycled water infrastructure improvements or expansion. To improve the operation of the recycled water system, the Engineering Department has identified three additional work components, totaling $1,475,000, and recommends they be constructed now with the available Grant and Loan fund: 1. Expand the project by installing recycled water pipeline in Gibraltar Drive from West Las Positas to Hacienda Drive. This will install an additional 4,260-feet of distribution pipe and 12 more service connections at an estimated cost of $1,010,000 based upon the contractor's unit prices bid for the original contract. 2. Construct needed improvements in the Tassajara Recycled Water Reservoir Valve Vault at an estimated cost of$65,000. 3. Design and install a pump station at the Ken Mercer Sports Park to increase pressure for the park irrigation and allow future expansion of the recycled water system to locations south in the City of Pleasanton. Design and construction is estimated to cost approximately $400,000. The three components of work have been reviewed by the SWRCB staff and determined to be eligible for reimbursement by the Loan and Grant. To accomplish this work staff is proposing that the Gibraltar pipeline and the valve vault work be accomplished by change order to the existing construction contract with Ranger Pipelines. The Booster Pump Station design will be accomplished by Amendment Two to the existing RMC Water and Environment design contract. Depending on the timing of the construction, the pump station itself will be a change order with Ranger Pipelines, or a separate competitive bid. Alternatively it may be included with the upcoming Valley Avenue Recycled Water Pipeline project that will be bid in the fall. The Engineering Department and Operation Services Department staff are considering whether there are other system needs or improvements that can be funded by remaining $1,057,000 in the Loan and Grant. If other items are identified a recommendation will be presented to City Council at a future meeting. RECOMMENDATION 1. Authorize the Director of Engineering to approve and execute contract change orders for approximately $1,075,000 to construct the additional recycled water distribution pipeline in Gibraltar Avenue from West Los Positas to Hacienda Drive and to improve the valve vault at the Tassajara Recycled Water Reservoir. Page 2 of 8