The URL can be used to link to this page

Home My WebLink About05/06/2003, C7 - TRICKLING FILTER 3 PUMP, PIPING & VALVE REPLACEMENT, SPECIFICATION NO. 90158 council May 6, 2003 j ac En as izEpont l¢mNumb" c1r) C I TY O F SAN LU IS OBISPO FROM: Michael McCluskey, Public Works Director Prepared By: Michael J. McGuire, Assistant Engineer tom" SUBJECT: TRICKLING FILTER 3 PUMP, PIPING & VALVE REPLACEMENT, SPECIFICATION NO. 90158 CAO RECOMMENDATION 1. Approve plans and specifications for"Trickling Filter 3 Pump, Piping& Valve Replacement", Specification No. 90158. 2. Authorize staff to advertise for bids and authorize the CAO to award the contract if the lowest responsible bid is within the engineer's estimate of$110,000. DISCUSSION Trickling Filter 3 (TF3) was originally constructed in the early 1960's. The mechanism distributes primary effluent over a circular bed of rocks, where microorganisms feed on the dissolved organic compounds in the wastewater. An ancillary facility is the Pump Pit, which contains pumps and valves that regulate and control the flow of effluent to Trickling Filter 3 and to other mechanisms at the Water Reclamation Facility(WRF). Over the past 40 years, some of the mechanical components of TF3 and the Pump Pit have experienced substantial corrosion or simply worn out. This has resulted in the biological filter operating at a reduced efficiency. This project involves the replacement of vertical pumps and sliding gate valves at the Pump Pit and the installation of replacement distribution arms at TF3 under the direct supervision of the distribution arm manufacturer. The funding for the distribution arms and installation supervision is under the project "Sole-Source Purchase Of Distribution Arms For Trickling Filter 3 At The Water Reclamation Facility", which was approved by the City Council on April 1, 2003. This close coordination between projects is expected to result in reduced impacts to WRF operations and the lowest overall cost for both projects. CONCURRENCES The project has received approval from the Interim WRF Supervisor and the Utilities Department. This project is categorically exempt from environmental review as determined by the Community Development Department. Council Agenda Report—_Trickling Filter 3 Pump, Piping & Valve Replacement Page 2 FISCAL IMPACT A total of$110,000 was approved for this Capital Improvement Project as a part of the 1999-01 Financial Plan (See pages 116-119 of Appendix B to the Financial Plan). Funding for the project is included as one of the WRF Major Equipment & Structure 2000-01 projects, which currently has $652,844 to support this and other identified projects. At the time this project is recommended to be awarded, a budget amendment request will transfer funding from Major Equipment Maintenance to Trickling Filter 3 Pump, Piping &Valve Replacement. ATTACHMENTS 1. April 1, 2003 Council Agenda Report. Plans and Specifications are available in the Council reading file. g:\—current projects\water reclamation facility\90158 wrf repairs\90158_candoc c�-a ATTACHMENT 1 Council j agenda REpoat Tt.N. , C I TY OF S AN L U IS O B I S P O FROM: John-Moss,Utilities Director Prepared By: Dan Gilmore, Utilities Engineer SUBJECT: SOLE-SOURCE PURCHASE OF DISTRIBUTION ARMS FOR TRICKLING FILTERS AT THE WATER RECLAMATION FACILITY CAO RECOMMENDATION: Authorize the sole-source purchase of replacement distribution arms for Trickling Filter 3 at the Water Reclamation Facility from Dorr-Oliver EIMCO, in the amount of$78,824; and.approve installation inspection costs not to exceed $10,000, for a total cost not to exceed $88,824 to come from Sewer Fund working capital. DISCUSSION: Trickling Filter 3 (TF3) was originally constructed in the early 1960's. The mechanism distributes primary effluent over a circular bed of rocks, where microorganisms feed on the dissolved organic compounds in the wastewater. As part of the secondary stage of wastewater treatment,the equipment operates in a fairly harsh environment. Over time, the distribution arms have experienced substantial corrosion, resulting in uneven distribution of the wastewater effluent. This results in the biological.filter operating at a reduced efficiency. This project involves the purchase of replacement distribution arms for Trickling Filter 3 at the Water Reclamation Facility (WRF). Staff solicited estimates from three companies known to perform this type of work. The cost estimates ranged from $62,800 to $185;000, not including tax, shipping, and installation. Although the quote from Don:-Oliver was about 10% higher than the lowest estimate, staff is most comfortable purchasing the replacement arms from them, since they are the original manufacturer of the equipment. Staff feels that Don:-Oliver is uniquely qualified, since the arms can be fabricated, installed, and balanced in accordance with the original design by the original manufacturer. Any other supplier would be required to generate fabrication drawings based on the existing arms, which in some locations are so deteriorated that accurate dimensions maybe impossible to measure. As the original equipment manufacturer, Dorr- Oliver EIMCO has the complete records and shop drawings,of the existing distribution arms. Staff believes that purchasing the replacement distribution arms from Dorr-Oliver EIMCO is in the best interests of the City. Purchase and replacement of the distribution arms on TF3 was originally,planned to be a part of the 2003-05 Financial Plan. However, this project must be constructed in the summer months, when Cal Poly attendance is reduced and wastewater flows to the WRF are at their seasonal low. Due to the amount of damage caused by corrosion and a sixteen-week lead time to fabricate the C � -3 Council Agenda Report—Replacement of Distribution Arms on TF3 at the WRF Page 2 arms, staff is requesting approval of the CAO Recommendation in advance of Council approving the 2003-05 Financial Plan. In addition, this will allow coordination with another project in the same area of the WRF. Staff intends to move forward with the preparation of plans and specifications for a project entitled, "Trickling Filter 3 Pump, Piping & Valve Replacement". This project, which is identified in the 2000-01 Budget, will include requirements to install the distribution arms at the same time as the pump, piping, and valves. This close coordination between projects is expected to result in reduced impacts to WRF operations and the lowest overall cost for both projects. The funding for installation inspection and balancing will ensure that a Dorr-Oliver representative is on site to ensure proper installation by the contractor. FISCAL IMPACT: Initially planned to be a part of the 2003-05 Financial Plan,this project needs to move forward now, as explained above, and staff is requesting approval to take the $88,824 from Sewer Fund working capital. Staff believes that this amount is adequate to cover the cost of the distribution arms, installation inspection,balancing, and contingencies. ALTERNATIVES: Defer or delay the project. These alternatives are not recommended, due to the current condition of the equipment and the critical necessity of having processes that operate efficiently at the Water Reclamation Facility. ATTACHMENTS: Quote from Don:-Oliver EIMCO Budget Amendment Request G:ICw ril fgvrh&pv l7T3Amu CAR