Friday, August 1, 2014
PLACERVILLE, CALIFORNIA
99 CENTS

Corrosion a constant battle for water tanks

Res 9 tank

LAMINAR CORROSION turns a rafter end in Reservoir 9 Tank into a metallic deck of cards. Photos courtesy EID

By
From page A1 | March 22, 2013 |

The El Dorado Irrigation District stores 71 million gallons of water in 36 storage tanks, with 27 of those being potable water for a total of 53 million gallons.

That’s a lot of metal that needs painting inside and out. Failure to regularly maintain the water tanks can result in rust so bad, such as the Reservoir 9 Tank where some of the rafter ends have delaminated. Or the Outingdale tank were the rafters are starting to come loose, with one already fallen part way into the tank.

In an informational presentation to the EID board March 11 engineer Bob Rice detailed the results of a photographic survey EID inspectors or divers had made of 23 of the district’s 36 tanks, Rice, who has specialized expertise in metal water tanks, ranked the 23, with three being excellent, eight good and two fair. There were six in poor conditions and four failing.

“The extent of this took us by surprise,” Rice said.

The failing ones added up to $1.85 million in capital expense estimated for this year. That includes replacement of the Outingdale tank at a cost of $250,000. Reservoir 9 Tank will need renovation and painting at a cost of $950,000. The Deer Creek Equalization Tanks will need renovation and painting at a cost of $650,000.

The 62,000-gallon Outingdale Tank was built in 1993 and the 1 million-gallon Deer Creek tank in 2007. The Outingdale Tank’s interior structure is perilous enough that Rice “cautioned staff about walking on top” of the tank. The 2 million-gallon Reservoir 9 Tank was built in 2001.

Two factors add to the corrosion. One factor, according to Rice, is water entering the tanks through a pipe extending too near the roof that spills water into the tank. This top loading creates a mist of chlorine that can more quickly corrode the tank’s roof. To remedy this water should enter the tank from a side inlet instead.

Another factor is painting flaws such as inadequate surface preparation, inadequate dehumidification, improper paint application technique and inadequate inspection.

“Inspection is the most important part of the process,” Rice said. “Since 2006 we have been hiring specialty paint inspectors.”

In fact, Rice said he has come to realize that certified paint inspectors must be on the job during the entire painting process.

“Now our paint specifications are 31 pages long,” Rice said.

“We have extensive qualifications on paint contractors,” Rice said.

The maintenance and inspection program includes inspecting the exterior of each tank annually and having divers clean and spot paint 15 tanks in the last four years. Wastewater and recycled water tanks are being included in the program.

The maintenance program’s goals include a five-year cycle for interior inspection of all tanks, dive seven tanks per year for cleaning and spot painting and establish a routine coating cycle for all tanks.

For the 2014-2019 period Rice is recommending renovating two tanks annually at a cost of $1.6 million, redoing the top coat of one tank annually for $250,000 and dive and clean seven tanks for $50,000. The annual total is estimated to be $1.9 million.

“It’s a 15-year cycle and we need to get ahead of this,” said EID General Manager Jim Abercrombie.

Again noting the need to issue capital improvement bonds, Abercrombie listed critical capital projects that included $10 million for water tanks, $17 million-$20 million for raising and strengthening Forebay Dam, and $20 million for three flume projects.

“Reinvesting capital in our assets is critical,” Abercrombie said.

Comments

comments

Michael Raffety

.

News

Cameron Park house burns

By Dawn Hodson | From Page: A1 | Gallery

 
Supes delay petition

By Chris Daley | From Page: A1

Fire generated small city, inspired volunteers

By Dawn Hodson | From Page: A1 | Gallery

 
Sand Fire 95% contained

By Cole Mayer | From Page: A1

 
Two fires in town

By Cole Mayer | From Page: A3

SUV hits parked cars

By Dawn Hodson | From Page: A12

 
.

Opinion

The weekly Daley: The wrong side of history

By Chris Daley | From Page: A4

 
Billingsley’s bullets: Advice from my psychiatrist

By Bob Billingsley | From Page: A4

.

Letters

EID rate discrimination

By Letters to the Editor | From Page: A5Comments are off for this post

 
Second Amendment

By Letters to the Editor | From Page: A5Comments are off for this post

Pollock Pines’ Fourth of July Parade

By Letters to the Editor | From Page: A5Comments are off for this post

 
Water conservation

By Letters to the Editor | From Page: A5Comments are off for this post

Koby

By Letters to the Editor | From Page: A5

 
Debt reduction at EID with Coco?

By Letters to the Editor | From Page: A5

Time for change in CP

By Letters to the Editor | From Page: A5

 
Olives need less water

By Letters to the Editor | From Page: A5

.

Sports

Camp draws good numbers

By Jerry Heinzer | From Page: A9Comments are off for this post | Gallery

 
New law tackles gridiron concussion problem

By Mike Bush | From Page: A9 | Gallery

Outside with Charlie: Rafting denied

By Charlie Ferris | From Page: A9

 
Racing returns with big 5-division card

By Bill Sullivan | From Page: A9

Roundup: July 31, 2014

By Democrat Staff | From Page: A10

 
.

Prospecting

Sing while you paint

By Placerville Arts Association | From Page: B1Comments are off for this post | Gallery

 
Plenty of golden fun during SlugFest

By Democrat Staff | From Page: B2 | Gallery

Things to do: Aug. 1, 2014

By Democrat Staff | From Page: B2

 
The making of a champion

By Special to the Democrat | From Page: B2

Art on the Divide is showing new exhibitor

By Art On The Divide | From Page: B3

 
‘The Flu Season’ stirs emotions

By Ovation Stage | From Page: B4

Guitar group performs in Sutter Creek

By Sutter Creek | From Page: B5

 
Time to register for classes at Center Stage

By Center Stage Dance Academy | From Page: B5

Get a groove on in Sutter Creek

By Sutter Creek | From Page: B8

 
Chris Young in concert at Carson Valley Inn

By Carson Valley Inn | From Page: B8

The music continues at Bear Valley Music Festival

By News Release | From Page: B8

 
Sacramento Museums are celebrating

By Sacramento Association Of Museums | From Page: B9

 
.

Essentials

Weather stats

By Michael Raffety | From Page: A2

 
Crime Log: July 17-19

By Cole Mayer | From Page: A2

.

Obituaries

Larry A. Randall

By Contributor | From Page: A2

 
Mark A. Smith

By Contributor | From Page: A2

Jeffie “Jeff” Lee Callahan

By Contributor | From Page: A2

 
Patsy Ruth Wing

By Contributor | From Page: A2

Lisa Oliver Rose

By Contributor | From Page: A2

 
.

Real Estate

Decorating your home by the numbers

By Marni Jameson | From Page: HS4

 
Avoiding the deal killers

By Ken Calhoon | From Page: HS4

Hilltop home views outrank water-front views

Press Release | From Page: HS7

 
Luxury home sales jump

Press Release | From Page: HS11

 
Pending home sales decrease in June

Press Release | From Page: HS13

 
Sheryl Lindroos joins American Heritage

Press Release | From Page: HS17

Sunny Rosabella exudes a warm ambiance

Press Release | From Page: HS23

 
.

Comics

.

Home Source

Decorating your home by the numbers

By Marni Jameson | From Page: HS4

Avoiding the deal killers

By Ken Calhoon | From Page: HS4

Hilltop home views outrank water-front views

Press Release | From Page: HS7

Luxury home sales jump

Press Release | From Page: HS11

Pending home sales decrease in June

Press Release | From Page: HS13

Sheryl Lindroos joins American Heritage

Press Release | From Page: HS17

Sunny Rosabella exudes a warm ambiance

Press Release | From Page: HS23