The price tag for Sterling’s deep injection wells for RO brine escalates from $80,000 to $2.3 million

Reverse Osmosis Water Plant

From the Sterling Journal-Advocate (David Martinez):

[Sterling Public Works Director Jim Allen] told the council that Public Works was working on a number of water and sewage issues around the city – most of them directly or indirectly related to construction of the new water treatment plant.

The one that stands out: Deep injection wells used to pump the treated wastewater from the reverse osmosis filtration, estimated to cost $80,000 at the start of the project, will now cost about $2.3 million, according to a March 10 estimate. About $1.3 million of that cost would go toward the construction of one of the two pumps, which is located above the railroad tracks north of the plant…

The wells themselves, buried about 7,000 feet underground, have already been constructed. They were included in one of three bid packages for the project – the other two being a pipeline project and the water treatment plant itself, which is in the final construction stages.

Allen told the council the increased cost comes from the pumping equipment needed, as well as some stainless steel piping needed for the aboveground operation. The pipes might need to handle 2,200 to 2,600 pounds of pressure per square inch, which Allen said is a “monumental number.”[…]

Allen told the Journal-Advocate the $2.4 million also isn’t set in stone; he, Kiolbasa and others will be working with the estimates for a more solid cost…

In related projects concerning the plant, Public Works is continuing to redrill and rehabilitate the city’s raw water wells. The effort is part of a plan to have enough raw water to actually put through to the water treatment plant.

In February the council heard that the plant planned on having the ability to pump more than 7,900 gallons of water per minute, but that it could only pump about 5,500 gallons at that point because of degraded wells.

More infrastructure coverage here.

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