 |  | 5919 MAIN STREET . NEW PORT RICHEY, FL 34652 . 727.853.1016 |
| TO: | City of New Port Richey City Council | | FROM: | Robert M Rivera, Public Works Director | | DATE: | 6/4/2019 | | RE: | Task Order No. 36 Engineering Services – Consideration for Approval |
REQUEST:
The request of staff for the City Council to review and consider for approval is Task Order No. 36 from Stroud Engineering Consultants, Inc. in the amount not to exceed $79,080.00 for engineering services associated with the design, permitting, and construction of the Wastewater Treatment Plant (WWTP) aeration basin/tank influent pipe replacements.
DISCUSSION:
As City Council may recall, on May 4, 2019 the City’s WWTP had a section of buried 20” ductile iron pipe rupture resulting in a significant sewer spill. Subsequent to staff’s inspection of the pipe, it was determined that the interior of the pipe contained major corrosion characteristics that caused the pipes failure. Upon further investigation of additional sections of pipe, it has been identified that these sections contain corrosion characteristics as well. The pipe was installed in 1988 and is used to transfer effluent from aeration basin/tank #1 to the plants headwork’s for preliminary treatment of the effluent. In addition, another 20” ductile iron pipe was installed for aeration basin/tank #2 as part of the 1988 project.
The project scope of work for this project includes subsurface utility engineering (SUE), to determine the location of existing utility lines, electric power cables, and potential utility facilities that are not identified in the plant’s as-built drawings. The installation of a shut off valve directly on the outside of the aeration tank and installation of temporary piping to get aeration basin/tank No. 2 back on line. Once the plant is operating at full capacity, work will begin to replace pipe runs from the aeration basins/tanks No. 1 and No. 2 and the installation of permanent valves. Once the pipe replacements and valves have been completed the existing pipes will be capped and filled with grout to avoid soil collapse below the newly installed replacement pipe. Finally, once this scope of work is completed, the existing pipes connected to aeration basin/tanks No. 3 and No. 4 and the Schreiber tank will be visually inspected to determine what type of work if any, might be needed such as pipe lining and/or pipe replacement.
RECOMMENDATION:
Approval of Task Order No. 36 is recommended.
BUDGET/FISCAL IMPACT:
Funding is identified as Water and Sewer Utility Construction Funds Account No. 405535-46391-0963. It should be noted that Pasco County is part owner of the WWTP and is responsible for 40% of all capital costs associated with plant renewal and replacement projects as called out in an inter-local agreement with the City. This inter-local agreement identifies the City as the lead owner operator responsible for 60% of the cost. | | | |