HomeMy WebLinkAbout02/08/1993 Item #7-1
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February 8, 1993
CITY COUNCIL AGENDA
ITEM NO.__
or & Members of the City Council C —
FROM: Utilities Department
SUBJECT: PROFESSIONAL SERVICES AGREEMENT FOR
FINAL DESIGN OF SECTION 5 WASTEWATER LIFT STATION
LOCATED ON LITTLE BALBOA ISLAND
BARRETT CONSULTING GROUP
RECOMMENDATIONS:
1. If desired, authorize the Mayor and the City Clerk to execute
a Professional Services Agreement on behalf of the City, with
Barrett Consulting Group, to design the Section 5 Wastewater
Lift Station for a fixed fee of $57,900.
BACKGROUND:
The City's sewer system is somewhat unique in that it serves
a coastal city with many low -lying communities. Most sewer systems
operate with predominantly gravity-flow sewer mains. Unfortunately,
when the areas served are at, or near, sea - level, gravity will not convey
the sewage to the desired location without pumping. Newport Beach
has a disproportionately high number of pump stations compared to
other municipal sewer agencies because of the topography of the area.
The City operates 24 wastewater lift stations and 185 miles
of sewer mains. Each day, nearly 15.5 million gallons of sewage are
pumped across the City toward the County Sanitation District's
treatment plant in Huntington Beach. The pump stations operate
continuously throughout the day and night, 365 days a year.
Another factor contributing to the City's somewhat unique
sewer service situation is related to the fact that Newport Beach is a
coastal community. The City has 6 miles of beach and 25 miles of harbor
shoreline which provide extraordinary opportunities for sand to be
introduced into the City's sewers. Sand and pumps do not get along well
together. The sand causes a great deal of wear. This results in higher
maintenance costs and more frequent pump impeller and bowl
replacements. Similarly. Newport's sewage tends to have a higher salt
content, probably because the local groundwater, bay and ocean are all
saltwater. Saltwater is corrosive. Sewage that has a high salt content is
very, very corrosive.
• Page 2
Professiona Services Agreement
Design of Section 5 Wastewater Lift Station
February 8, 1993
DISCUSSION:
Being generally concerned about the City's ability to properly
maintain its sewer system, the Utilities Committee requested that staff
prepare a report on the condition of the City's 24 wastewater lift stations.
In January 1988, the City commissioned a study, by a private
consultant, to evaluate and report findings about the City's sewer pump
stations. In November 1988, Woodside- Kubota Consulting Engineers
completed the study and filed a report of findings and recommendations.
The report outlined a program for replacement,
reconstruction and upgrading of many of the City's older wastewater lift
stations. A listing of priorities was a key part of the consultant's report
to the City. Most of the stations were designed and constructed in the
1930's, 40's and 50's. Those stations all required significant work.
Near the top of the priority list, was the Section 5 Lift Station on Little
Balboa Island. It was recommended that the station be completely
reconstructed.
The existing Section 5 Wastewater Lift Station was
constructed in the 1940's, when Balboa Island was less developed and
its sewer load was considerably lower. The existing station no longer
has the capacity required to meet peak flow demands. Additionally,
the 50 year old station has been operated beyond its design life. The
pumps are worn, obsolete, inefficient, undersized and unreliable. Many
of the components of the station do not meet State mandated codes
and standards.
The City hired a consulting engineer to perform a detailed
study for reconstructing the lift station. The preliminary design was
begun in January 1990. The design study determined the required
hydraulic capacity of the station and investigated construction options.
The consultant determined that the only feasible alternative for
upgrading the station was to construct a new lift station in a nearby
location. Several locations were reviewed. The best site was
determined to be at the Jade Avenue street end. The preliminary
design also included a geotechnical, seismic and soils study with field
borings and sampling to provide the parameters for a final design at
this location. Traffic control, parking, construction phasing, continuity
of sewer and utility service, construction dewatering and various
permit requirements were analyzed. A preliminary cost estimate was
prepared. The cost of the project was estimated to be $750,000 to
$950,000.
The issue of funding the replacement of the station and
generating enough money to upgrade the other aging wastewater lift
stations was the topic of discussion between staff and the Utilities
Committee for several months in early 1990.
Z
Page 3
• Professional Services Agreement
Design of Section 5 Wastewater Lift Station
February 8, 1993
In accord with the Utilities Committee recommendations,
staff prepared a report on the sewer system and rates and presented it
to the City Council at the study session on May 13, 1990. The Council
requested that staff prepare a rate proposal for review with the Utilities
Committee. The Utilities Committee reviewed it and recommended
that the City move to implement a new revenue structure which would
more fairly spread the costs of providing sewer service.
In June 1990, the Council approved a new rate structure
which reduced the basic rates for homeowners and began charging all
customers for the amount of flow contributed to the system. However,
the new rate structure did not properly anticipate the effect the drought
and a water rationing program would have on revenues. In 1991 and
1992, the City's Wastewater Enterprise Fund did not have revenues
sufficient to provide for the necessary capital improvements or to set
aside funds for reserves at a level necessary to keep the system in proper
working order.
Recognizing the seriousness of this situation, the City
Council approved a fee increase on June 22, 1992 and directed staff to
implement a program to improve the City's wastewater pump stations.
Staff studied the system's problems and priorities and established a
10 -year replacement program for upgrading the City's 24 wastewater
lift stations. The program, set up as the "Sewer Pump Station
Improvement Program" is funded by setting aside revenues into a
reserve account until each station's upgrade is designed and ready to
construct.
As noted above, a recommended plan of improvements to
the City's wastewater lift stations was prepared by Woodside- Kubota
Consulting Engineers. The plan identified the Section 5 Wastewater
Lift Station as one of the top priorities. To implement the station's
replacement, staff invited selected firms to submit statements of
qualifications and experience. After consideration of qualifications
and experience, staff requested Barrett Consulting Group to submit a
proposal.
Barrett Consulting Group has a team of well qualified,
technical professionals and designers who have experience with similar
wastewater and pump station design projects. The firm performed the
preliminary design for the Section 5 Lift Station for the City and is
intimately familiar with the requirements specific to this design project.
The proposed Professional Services Agreement with Barrett
Consulting Group provides for final design of the lift station and
preparation of detailed plans, written special provisions and
specifications for bidding and construction.
• Page 4
Professional Services Agreement
Design of Section 5 Wastewater Lift Station
February 8. 1993
The Utilities Committee reviewed the consultant's proposal
for design of the proposed project and the draft Professional Services
Agreement at its meeting on January 131h, 1993. The Committee
recommended its approval and asked staff to forward the item to the
Council for consideration.
Funds are available in the Wastewater Enterprise Fund in the
Capital Projects Account No. 7533- 98530002 as a part of the City's Sewer
Pump Station Improvement Program. If approved, the final design effort
can commence immediately. Plans and specifications could be ready for
bidding by late spring.
Respectfully submitted,
.JEFF- 5' r-A NEA[ZT-
Jeff Staneart, P.E.
Utilities Director
JS: sdi
Attachments: A: News Article on Section 5 Lill Station Replacement
B: 10 -year Sewer Lift Station Improvement Program Summary
C: Professional Services Agreement
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