COUNTY OF SAN MATEO
Department of Public Works
March 13, 2009
BOARD MEETING DATE:
March 31, 2009
Honorable Board of Supervisors
James C. Porter, Director of Public Works
Increase in Contract Authorization – Sanitary Sewer Repair (Park Road and Springdale Way Slides), Emerald Lake Heights Sewer Maintenance District, (Project No. SE002, F-351 [25C])
Acting as the governing board of the Emerald Lake Heights Sewer Maintenance District (District), adopt a resolution authorizing an increase of $20,000 in the “not-to-exceed” payment limit for contract costs for the repair of the sanitary sewer lines damaged by landslides in the vicinity of Park Road and Springdale Way in the Emerald Lake Hills Area, for a revised “not-to-exceed” amount of $291,018 (Project No. SE002, F-351 [25C]).
Commitment: Ensure basic health and safety for all.
Goal 7: Maintain and enhance the public safety of all residents and visitors.
Authorizing an increase in the “not to exceed” contract amount will allow the District to finalize the payment to the contractor for the construction of the permanent repair of the sanitary sewer lines which have improved the integrity of the sewer infrastructure and protection of the environment for the benefit of the public.
PREVIOUS BOARD ACTION
On August 12, 2008, your board adopted Resolution No. 069646, which authorized the execution of an agreement for the construction of the above-mentioned project. The contract amount was $246,018, and project “not to exceed amount”, which included a 10% contingency of approximately $25,000, was $271,018.00.
The contingency has been used to pay the contractor for any additional material placed for the various bid items and added work resulting from unforeseen conditions not anticipated in the construction contract document but discovered during construction. The unforeseen conditions included repair of an additional 50 foot long section of sewer main immediately upstream of the project area, which had previously been installed after the original landslide occurred in 1986, and relocation of the sewer main so that it is farther from the foundation of a residence built in 2001. This resulted in a net increase of $23,320.00 to the original contract, which was within the not-to-exceed authorized by Resolution No. 069646.
The contractor has subsequently performed additional work that included: reconnecting and extending two existing drainage pipes and drilling through harder than anticipated rock in connection with installing the new sewer main. These items of work were not identified during the design process through either the field surveys or the geotechnical investigation. Again this additional work is the result of unforeseen conditions not anticipated in the construction contract documents.
County Counsel has approved as to form a resolution that authorizes an increase in the amount to be paid for the additional work.
The original “not-to-exceed” limit for the project was $271,018.00, which included a 10% contingency. The proposed increase in payments to the contractor will increase the not to exceed limit by $20,000.00 to $291,018.00. This increase will be financed with District funds that have been allocated for this project.
There is no impact to the General Fund.