CC 2015-08-11_08b Sewer Main Repair_Lift Station 1MEMORANDUM
TO: CITY COUNCIL
FROM: GEOFF ENGLISH, DIRECTOR OF PUBLIC WOR~
BY: SHANE TAYLOR, PUBLIC WORKS SUPERVISOR -UTILITIES
SUBJECT: CONSIDERATION TO FUND SEWER MAIN REPAIR PROJECT AT
SEWER LIFT STATION N0.1
DATE: AUGUST 11, 2015
RECOMMENDATION:
It is recommended the City Council authorize the appropriation of $75,000 from the
Sewer Fund balance to repair the 8" sewer main at Sewer Lift Station No. 1.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
A cost estimate to replace the section of sewer main was prepared by R. Baker, Inc. in
the amount of $62,320. Based on this estimate, an informal bid process will be required
along with some engineering specifications and drawings. Adding 20% to the estimate,
an amount of $75,000 may be required to complete the project. Currently the pipe is
compromised and requires preventative maintenance cleaning on a monthly basis at a
minimum.
BACKGROUND:
Sewer Lift Station No. 1 was built in 1973 and is our largest sewer lift station. The
station pumps approximately 350,000 gallons/day of sewage from the location in front of
Carl's Jr. up West Branch Street to the movie theater, then under Highway 101 to El
Camino Real.
The station was rebuilt in 2007, and part of the project was to slipline a section of sewer
main from a· new manhole to the lift station wet well, which is 25' in length. The pipe is
20' deep. When the main was lined, an offset joint caused the line to cure in an oval
position so that the flow was restricted. Over the years this has caused some issues,
including two (2) overflows into Meadow Creek.
A separate float alarm was installed in the manhole and this has worked in notifying
department personnel prior to an overflow occurring. The restriction in the pipe is
getting worse and may lead to serious problems, such as a complete pipe blockage.
Item 8.b. - Page 1
CITY COUNCIL
CONSIDERATION TO FUND SEWER MAIN REPAIR PROJECT AT SEWER LIFT STATION
N0.1
AUGUST 11, 2015
PAGE2
ANALYSIS OF ISSUES:
The replacement of an approximately 15' section of 8" sewer main is a relatively simple
job. The challenge at this location is that the main is very deep and will require large
equipment and specialized trench shielding. In addition, when the lift station was rebuilt
a new manhole was installed in the sidewalk on West Branch Street. The contractor at
that time encountered groundwater and had difficulty installing the manhole.
It is our hope that the current drought has caused the groundwater level in this area to
drop which would make this excavation easier. If not, the project becomes difficult as a
dewatering system would be required. Regardless, it has become imperative that this
main section be replaced to prevent a serious sewer overflow event into Meadow
Creek.
ALTERNATIVES:
The following alternatives are provided for Council consideration:
Approve funding the sewer main repair project and appropriate $75,000 from the
Sewer Fund balance;
Do not approve funding the sewer main repair project; or
Provide direction to staff.
ADVANTAGES:
The funding of this repair will prevent the possibility of a complete pipe blockage and
sewage overflow, which could result in a threat to the public health and safety and large
regulatory fines. It will also eliminate the need for monthly preventative maintenance
and cleaning.
DISADVANTAGES:
The cost to replace the section of sewer main will cost approximately $75,000.
ENVIRONMENTAL REVIEW:
No environmental review is required for this item.
PUBLIC NOTIFICATION AND COMMENTS:
The Agenda was posted in front of City Hall on Thursday, August 6, 2015. The Agenda
and staff report were posted on the City's website on Friday, August 7, 2015.
Attachments:
1. Budget Numbers for Pipe Repair at Lift Station No. 1 (R. Baker, Inc. dated
7/16/2015)
Item 8.b. - Page 2
Date:
Co:
To:
From:
Re:
R. BAKER, INC.
PIPE LINE AND UTILITY CONSTRUCTION
Post Office Box 419
7/16/2015
Arroyo Grande, California 93421
Contractors License No. 372751
Phone 805-489-8711 Fax 805-489-1653
Email: gregsherer@charter.net
Pages 1of1
City of Arroyo Grande
Shane Taylor
Greg Sherer
Budget Numbers for Pipe Repair at Lift Station No. 1
Here is what I have come up with:
1.
2.
3.
4.
Pothole
Excavate, Shoring, Dewater, & Repair
Backfill & Compact
Clean Up & Replace PCC Sidewalk
2,025.00
37,850.00
15,935.00
6.510.00
Total 62,320.00
These budget costs are based on being able to truck excess spoils and store them onsite on
city property near the Woman's Club at West Branch and Old Ranch Road. Depending on
excavation conditions, these numbers could go much higher due to ground water and if
there is a lot of gravel to deal with from previous backfill operations.
With that being said, if conditions are good, these budget costs could drop considerably.
We just know until we begin excavating and see what the conditions are.
Please Note: This is not a bid or proposal. These are only budget numbers. We would
consider doing this work on a Time & Material basis only.
Sincerely,
Greg Sherer
R. Baker, Inc.
Estimator
ATTACHMENT 1
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