HomeMy WebLinkAbout1975-08-19; City Council; 3310-1; Vista Carlsbad sewage transmission system*** CITY OF CARLSBAD >""' / ^
AGENDA BILL NO. 3310 Suppl. No. 1 Initial:
Dept.Hd.
DATE: August 19, 1975
DEPARTMENT: Engineering ^ C. Mgr.
Subject:
VISTA-CARLSBAD SEWAGE TRANSMISSION SYSTEM - IMPROVEMENT AND ENLARGEMENT
OF THE BUENA VISTA AND AGUA HEDIONDA PUMPING STATIONS '
Statement of the Matter
On March 4, 1975, the City Council accepted the project report and
certified the information in the EIR which was previously certified
. by the Vista Sanitation District (VSD) in its capacity as lead agency.
Council also authorized preparation of the plans and specifications
for Phases IA and IB, the Buena Vista force main paralleling and the
upgrading and phased enlargement of the Buena Vista pump station.
The request before the Council at this time is for authorization to
permit the VSD to accept bids on Phase IA of the project. Staff will
work with VSD staff to prepare a supplement to the Basic.Agreement
outlining ownership rights and cost sharing of the proposed system
(as outlined in the Project Report).
Exhibit
1. staff memorandum
Recommendation . .
It is recommended that City Council authorize the Vista Sanitation
District, in its capacity as lead agency,.to accept bids for the
paralleled Buena Vista force main.
Council action
8-19-75 The City Council -authorized the Vista Sanitation District, in
its capacity as lead agency, to advertise for bids for the
Buena Vista force main.
MEMORANDUM
August 11, 1975
TO: City Manager
FROM: Public Works Administrator n/
SUBJECT: Buena Vista pump station and force main project
The City Council at its meeting of March 4, 1975, approved the accep-
tance of the project report for the "Improvement and Enlargement of
the Buena Vista and Agua Hedionda Pump Stations", and authorized Vista
to direct the consultant to prepare the plans and specifications for
the paralleled Buena Vista force main construction and the upgrading
and phased enlargement of the Buena Vista pump station.
The plans and specifications for the paralleled force main portion of
the project have been prepared and approved by the professional staff.
The consultant is in the process of preparing plans and specifications
for the more complex upgrading and phased enlargement of the pump station.
The project manager (County Department of Sanitation and Flood Control)
has proposed that the City and Vista Sanitation District proceed with
the installation of the force main portion of the project (Phase IA of
the Buena Vista segment as described in the project report) as soon as
possible to minimize the effects of cost escalation and to get the pipe
in the ground before the rainy season gets here.
The immediate impact of the construction of the force main will be to
increase the peak capacity of the pump station from 5.7 MGD to 8.8 MGD.
This can be accomplished because the existing pumps will have less
resistance to flow due to a larger pipe area and, therefore, can move
a larger volume of wastewater with the same equipment. In addition to
the normal impacts of increased capacity, the additional impact in this
instance will be the ability to handle peak wet weather flow conditions
during the upcoming heavy rain season.
Existing gravity lines downstream of the proposed force main can handle
the potential increased flow that may result from the force main project
and the first phase of enlargement of the pump station. Funds for the
Buena Vista force main and pump station project have been approved in
the 1975-76 budget.
Staff will be returning to Council within the next sixty days with a
proposed supplement to the Basic Joint Sewer Agreement. This supplement
will formalize the agreed-to sharing of costs and the revised percentages
of ownership outlined in the project report.
RECOMMENDATION
It is recommended that the City Council authorize the Vista Sanitation
District, in its capacity as lead agency, to receive bids for the para-
lleled Buena Vista force main.
RAB/dh