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FPUD approves change order for Rattlesnake Reservoir re-coating

A change order to the Fallbrook Public Utility District's (FPUD) contract with Simpson Sandblasting for re-coating Rattlesnake Reservoir was approved on a 5-0 FPUD board vote April 27.

The change order adds $75,200.86 to the original $457,740 contract to bring the total amount to $532,940.86 and covers additional tasks determined to be needed after an inspection of the emptied tank discovered existing interior corrosion.

"It's additional work to complete the refurbishment," said FPUD general manager Brian Brady.

FPUD has a planned maintenance program which re-coats the interior and exterior of steel tanks to protect them from corrosion. A dive inspection of all tanks identified those which require immediate action to protect the steel from structural damage due to the deterioration of the painting system, and Rattlesnake Reservoir was among the tanks determined to need immediate attention.

FPUD staff prepared a bid package for the re-lining and repair of Rattlesnake Reservoir. Four bids were received by the Jan. 14 deadline. The $457,740 bid submitted by Simpson Sandblasting was the lowest, and on Jan. 26 FPUD's board voted 4-0 with Milt Davies absent to award a contract to the Corona company to re-coat the interior and exterior of the reservoir.

The tank was drained for the construction work, and when the rafters were inspected the existing structural bolts which connect the tank shell to the roof were discovered to be corroded. Additional piping modifications to provide additional seismic protection and protect the tank's structural integrity in the event of an earthquake were also determined to be necessary.

Approximately 850 bolts will require replacement; Simpson Sandblasting will replace all bolts, nuts, and washers at the rafters and girders with hot dipped galvanized nuts, bolts, and washers. Simpson Sandblasting will also slurry and weld a plate over the existing ten-inch pipe and create a new ten-inch connection on the side of the tank.

The increased contract amount is still within the $600,000 FPUD budgeted for the project, but the additional work changes the contract completion date from July 7 to Aug. 16.

 

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