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ATTACHMENT # 1 DER TWA DAD°El:l 11D /r c vfrd WATER AuTkoR/Iy PARTNERS®M WATER RECyC/Mroq December 6,2016 Leonard Olive Assistant Director Operations Services City of Pleasanton PO Box 520 Pleasanton CA 94566 Subject: Progress and Payments—DERWA Phase 2 Recycled Water Treatment Plant Expansion Dear Mr. Olive. This letter provides an update on the status of the DERWA Phase 2 Project, and requests a notice to proceed and payment from City of Pleasanton as described in the ongmal agreement between DERWA and the City of Pleasanton dated January 7,2014(Agreement) The DERWA Phase 2 Project capital cost was ongmally estimated at$19 5M The engineer's construction cost estimate was $15M. Construction was advertised on October 10,2016,and six bids were received on November 15, 2016. The bids ranged from$13 1 million to $16 5 million The apparent lowest,responsible and responsive bid was received from Overaa m the amount of $13,149,000 The updated total capital cost including a 7%change order contingency is$18 2M. DSRSD's Board awarded the construction contract to Overaa on December 6,2016. The construction duration is expected to be 14 months with construction completion in 2018. Phase 2 Recycled Water Treatment Expansion DERWA and Pleasanton have determined that the most cost-effective way to expand is to increase the capacity of the existing filters by adding Actiflo, compact high rate clanfiers,pnor to the sand filters This project is expected to increase the capacity of the filters thus allowing DERWA and Pleasanton to defer the addition of new filters until sometime in the future when additional filter capacity is required. As a part of this expansion,Pleasanton's share of capacity in the facilities will increase. The Phase 2 expansion will include increasing capacity of the sand filters through Actiflo, and expansion of the influent pumps,the ultraviolet system,and the effluent pumps The actual capacity available from each facility will vary, depending on the facility,but it is anticipated that if the Actiflo units increase filter capacity as expected, Pleasanton would have access to sufficient capacity to serve their projected demand of up to 3.4 MGD Further, once the new filter ratings have been determined,DERWA and Pleasanton can decide how the remaining capacity shortfall can be addressed to reach full project build out The cost and capacity allocations for each facility under Phase 2 are attached in Table 1. Once the new facilities are built, the system can be tested to determine the rated plant capacity. When this official capacity has been determined,DERWA will assess what will be the additional buy-in needed from 701 DablaPo Bovlkv&Rd, Duibk, CA 94568-018 ° ( 25) 82;. ;0515