10-04-2011 CC RPT 19 - Laserfiche WebLink

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First Amendment to Agreement with GE for the WQCP Phase 1 Expansion • Page 2 LEAPmbr Technology MBR technology is rapidly improving, particularly in the area of energy efficiency. The LEAPmbr system offers multiple advances including an increase in surface area, optimized tank design, increased productivity and advances in air scouring technology. The change that most impacts the WQCP is the advancement of the air scour aeration system. The new design removes the cyclic valves, associated air headers and reduces the number of air scour blowers. The simplified aeration system constantly pushes air into a plenum at the bottom of each cassette which is then allowed to "burst" in slugs and shake the membrane fibers more efficiently. The Technical Memorandum (Attachment 1) provides more detailed information regarding the LEAPmbr system and its impacts on the WQCP Phase 1 Expansion in terms of design, warranty, schedule, contract and cost. Construction Cost Savings The use of LEAPmbr would reduce the WQCP Phase 1 Expansion construction costs by approximately $800,000 due to the elimination of piping and equipment no longer required by the LEAPmbr design. Utility Savings /Warranty The Agreement with GE included a guarantee that the annual energy consumed by the air scour blower system would not exceed $239,057.43, or GE would pay the City for the increased energy cost. Under the proposed First Amendment, GE would guarantee that the LEAPmbr system energy costs will not exceed $164,518.50, a savings of $74,539 per year over the current Agreement. Design The incorporation of the LEAPmbr system into the current WQCP Phase 1 Expansion would require GE and CDM, designer of the overall project, to modify their respective designs. The cost of design revisions for both GE and CDM is $330,416 representing an approximate 2% cost increase to the MBR system. This is within the change order allowance previously approved by the City Council. Schedule To incorporate the design changes, both GE and the design team will need to modify the existing, almost complete bid documents. It is estimated that an additional four (4) to six (6) weeks will be required to revise, review and back check the design drawings. Contract To expedite design modifications and minimize any impact to the WQCP Phase 1 Expansion schedule, GE would contract directly with CDM for modification of the overall project design. Both the additional GE and CDM design costs would be authorized through the Agreement with GE. There is sufficient funding in the existing change order authority to accommodate these additional costs. Furthermore, the First Amendment would also be funded through the 10% change order allowance authorized under the Agreement. 19 -2