HomeMy WebLinkAboutAgenda Report - July 16, 2003 I-03CITY OF LODI
COUNCIL COMMUNICATION
AGENDA TITLE: Approve Design Concept for Lockeford Street Storrs Drainage Improvements;
Approve Plans and Specifications and Authorize Advertisement for Bids for
Lockeford Street Storm Drainage Improvements; and Adopt Resolution Authorizing
the City Manager to Award or Reject the Contract up to $142,000 and Appropriate
Funds
MEETING DATE: July 16, 2003
PREPARED BY: Public Works Director
RECOMMENDED ACTION: That the City Council approve staffs recommendation for Storm Drainage
Improvements to the Lockeford Street area to relieve the persistent storm
drainage problems; approve plans and specifications and authorize
advertisement for bids for Lockeford Street Storm Drainage
Improvements; and adopt a resolution authorizing the City Manager to
Award or Reject the Contract up to $142,000 and appropriate funds.
BACKGROUND INFORMATION: On February 19, 2003, City Council directed staff to prepare a
computer-based storm drainage model for the B-2 Basin, as shown
on Exhibit A. The computer model is a mathematical tool used to
predict the performance of the storm drainage conveyance facilities.
Staff purchased the software, STORMCAD, by Haestad Methods, to model the storm drainage system.
Modeling of the various basins in the City requires data input regarding pipe size, condition, elevation
and alignment. This information is obtained from improvement plans with confirmation by field surveys.
To date, model construction has been completed for the areas shown on Exhibit A. Lodi Lake pump
station is an important element of staff's analysis, and additional work is required before
recommendations can be presented to Council regarding enhanced operations at this facility.
The storm drainage model was calibrated and checked by Baumbach & Piazza, who has extensive
experience in storm drainage modeling and City facilities. A 2 -year storm event was applied to the
model and results were generated to show the area prone to flooding (see Exhibit B). Most of the
drainage facilities studied perform well under the 2 -year storm event. The most severe flooding occurs
at the storm drain trunk line along Holly Drive, Cross Street, and ending at Lockeford Street. This storm
drain trunk line is undersized for the intensity of development in the area.
Staff has investigated several alternatives to relieve the flooding problem in the Lockeford Street area,
using the computer model to select the best alternative. The following alternatives were considered:
1. Reroute the storm drainage from the Lockeford Street area westerly to the Mills Avenue storm
drain trunk line (Exhibit C).
APPROVED:
CC Design
H. Dixbn Flynn --
07109103
Approve Design Concept for Lockeford Street Storm Drainage Improvements; Approve Pians and
Specifications and Authorize Advertisement for Bids for Lockeford Street Storm Drainage Improvements;
and Adopt Resolution Authorizing the City Manager to Award or Reject the Contract up to $142,000 and
Appropriate Funds
July 16, 2003
Page 2
This alternative would provide a 2 -year storm event level of protection (current City Design
Standards) against street flooding in the Lockeford Street area. It involves installing new storm
drain pipes and catch basins in Lockeford Street. The model has shown that the storm drainage
trunk line in Mills Avenue has the excess capacity to accommodate this alternative. (Estimated
Cost = $142,000)
2. Reroute the storm drainage from the Lockeford Street area southerly to the Elm Street storm
drain trunk line (Exhibit D)This alternative would provide the same protection as Alternative 1. It
involves installing new storm drain pipes and catch basins in Lockeford Street and Loma Drive.
It also requires upsizing the existing storm drain pipe in Loma Drive. The model has shown that
the storm drain trunk line in Elm Street is currently at capacity. The additional storm drainage
from the Lockeford Street area to the Elm Street storm drain trunk line may cause additional
flooding at the eastern ends of the trunk line. (Estimated Cost = $155,000)
3. Replace the entire storm drain trunk line in Holly Drive, Cross Street, and Lockeford Street with
larger pipe (Exhibit E).
This alternative would provide the highest level of flood protection in the Lockeford Street area
and along the trunk line. It involves replacing all the downstream trunk line in the street and also
in the easements of residents' side yards and backyards. (Estimated Cost = $500,000)
(All the alternatives mentioned above have assumed the Lodi Lake Pump Station is operating at its
design capacity. The analysis of the existing pump station capacity is complicated, and staff is
performing the analysis and will present the finding at a later date.)
Staff is recommending Alternative 1. This alternative has a lower cost but still provides a level of service
comparable to the rest of the City. In order to expedite the Alternative 1 project and complete it before
this winter, staff is recommending the Council approve the plans and specifications, advertisement for
bids, and authorize the City Manager to award the contract for this project at this time.
FUNDING: Storm Drainage Impact Fees and Wastewater Operation Funds, total not to exceed
$142,000.
ichard C. Prima, Jr.
Public Works Director
Prepared by Lyman Chang, Associate Civil Engineer
RCPILCIpmf
Attachment
cc: Associate Civil Engineer, Chang
Street Superintendent
Water/Wastewater Superintendent
CC Design 07/09/03
RESOLUTION NO. 2003-136
A RESOLUTION OF THE LODI CITY COUNCIL APPROVING DESIGN CONCEPT FOR
LOCKEFORD STREET STORM DRAINAGE IMPROVEMENTS; APPROVING PLANS
AND SPECIFICATIONS AND AUTHORIZINIG ADVERTISEMENT FOR BIDS; FURTHER
AUTHORIZING THE CITY MANAGER TO AWARD OR REJECT THE CONTRACT UP
TO $142,000.00, AND FURTHER APPROPRIATING FUNDS FOR THE PROJECT
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WHEREAS, the City Council directed staff to prepare a computer-based storm drainage model
for the B-2 Basin (Lockeford Street area) due to severe flooding; and
WHEREAS, staff has found that most of the drainage facilities studied perform well under the
two-year storm event, causing the most severe flooding at the storm drain trunk line along Holly Drive,
Cross Street, and ending at Lockeford Street; and
WHEREAS, the storm drain trunk line is undersized for the intensity of development in the area;
and
WHEREAS, staff has investigated several alternatives to relieve the persistent storm drainage
problems in the Lockeford Street area, using a computer model to select the best alternative; and
WHEREAS, staff recommends rerouting the storm drainage from the Lockeford Street area
westerly to the Mills Avenue storm drain trunk. This recommendation has a lower cost but still provides a
level of service comparable to the rest of the City; and
WHEREAS, in order to expedite this project, staff recommends that the City Council approve the
design concept for Lockeford Street Storm Drainage Improvements, approve the plans and specifications,
authorize advertisement for bids, authorize the City Manager to award or reject the contract up to
$142,000.00, and further appropriate funds for this project.
NOW, THEREFORE, BE IT RESOLVED that the Lodi City Council does hereby approve the
design concept for Lockeford Street Storm Drainage Improvements, approves the plans and specifications
and authorizes advertisement for bids, and further authorizes the City Manager to award or reject the
contract up to $142,000.00; and
BE IT FURTHER RESOLVED that funds in the amount of $142,000.00 be appropriated from the
Storm Drainage Impact Fees and Wastewater Operation Funds for this project.
Dated: July 16, 2003
I hereby certify that Resolution No. 2003-136 was passed and adopted by the City Council of the
City of Lodi in a regular meeting held July 16, 2003, by the following vote:
AYES: COUNCIL MEMBERS — Beckman, Hansen, Howard, and Land
NOES: COUNCIL MEMBERS — None
ABSENT: COUNCIL MEMBERS — Mayor Hitchcock
ABSTAIN: COUNCIL MEMBERS — None
SUSAN J. BLA�KSTON
City Clerk
2003-136