Tag Archives: Reservoir

NJ Reservoir Drainage May Affect Local Drinking Water

Officials say water may look, smell differently, but is still safe to drink while the Cedar Grove Reservoir is drained.

While the Cedar Grove Reservoir is drained, workers will go in and repair corrosion damage, inspect its conduits and fix leakage.

The process of draining the reservoir, which is located along Ridge Road, is expected to take three to four months. During that time, water customers in towns supplied by the reservoir may notice some discoloration or changes to the taste of the water, but officials say the water is safe to drink.

The City of Newark owns the reservoir and the city’s Department of Water and Sewer Utilities for the City of Newark along with Mayor Cory A. Booker, explained that the discoloration occurs when valves are opened and closed during the drainage process. The Great Notch reservoir, owned by the Passaic Valley Water Commission and located in Woodland Park, will supply additional water to customers, so there is no interruption in the supply or quality of water while the repair work is being done.

“We are working to upgrade and modernize our water system and to provide residents with the highest quality water supply in the nation,” said Booker. “This repair work will require us to drain and inspect the Cedar Grove Reservoir, which may cause temporary discoloration or a change in the water’s taste. But the water provided will be safe to use.”

City officials say there is a leak in the outlet tunnel and corrosion damage to the 60-inch water main. The main also needs a new valve.

The reservoir provides water for Newark, Belleville, Bloomfield, and some areas of East Orange. Every decade or so, the reservoir is drained and cleaned of debris. Its pipes are inspected, and then it is re-filled. The project is expected to finish on April 30 of next year, according to Township Manager Thomas Tucci, who said the project will not create any issues to residents.

The city has not drained the reservoir since 1990 to perform repairs. Water samples are taken daily from the reservoir and tested to make sure the water quality complies with safe water drinking standards. Discoloration does not make the water unsafe, officials say, but could cause discoloration while washing clothes.

“There may be some slight color changes during the switchover,” said Andrew Pappachen, Director of Operations for the Newark Watershed Conservation and Development Corp. “However, we will ensure the potability by maintaining sufficient chlorine residual in the water. We will be monitoring the water quality more often.”

SOURCE: http://southward.patch.com/articles/reservoir-drainage-may-affect-local-drinking-water

Pipeline corrosion issues at Crystal Springs Reservoir requires underwater work

Coastside County Water District officials could spend about $125,000 for a dive team to fix corrosion problems that have closed off a pipeline at Crystal Springs Reservoir in California.

First discovered earlier this year, corrosion damage on the pipe equipment at Crystal Springs has caused a valve on the intake system to remain firmly shut, cutting off one conduit for the water district’s second largest source of water.

Water managers point out the district can still draw water using a second intake pipe at the reservoir, but parts on that pipe are also showing the same corrosion damage. They emphasize they need both pipes in working order to ensure the water source remains secure.

“If one failed, how far is the other one to go?” said water treatment plant supervisor Joe Guistino. “This is a critical water supply for the district under normal years.”

Half Moon Bay’s water district needs to look no further than the South Coast to see the importance of having well-maintained equipment. Last month, Pescadero lacked water for more than two days after its main water pump malfunctioned. The backup pump that was supposed to take over wasn’t activated until the town’s water supply was completely drained, causing a sudden water shortage that crippled the community.

Even in a worst-case scenario, Coastside water district officials say they would still be able to supply water for their customers in the Half Moon Bay area. The water district normally doesn’t need to draw from Crystal Springs Reservoir until the dry weather in the summer months begins to deplete other water sources. In the 2010-11 fiscal year, the district took more than 110 million gallons from the reservoir, approximately 16.5 percent of its total annual water supply. Despite the pipeline troubles, the utility drew more than 1 million gallons in July, all of which was used for irrigation at the Skylawn Memorial Park off Highway 92.

Water managers say the specific problems at Crystal Springs Reservoir are the pneumatic actuators on both water pipelines. One of the actuators has holes rusted through it, causing the device to perpetually close off an automated valve. The same equipment had corroded on the pipeline about 10 years ago and had to be replaced.

Finding new replacements would be one way to fix it, Guistino said, but that will require ordering a custom-made part from the manufacturer. Alternatively, the district could decide just to remove the actuators and leave the water pipe open.

Repairing the underwater pipes is a hazardous job that involves spelunking through plumbing tunnels under the lake. District staff used to access the tunnel system by riding a small basket 160 feet down a well shaft, but, today, safety concerns have led the district to hire outside professionals to handle any maintenance work.

Guistino estimated the water district could complete the repairs by next year.

SOURCE: http://www.hmbreview.com/news/ccwd-eyes-crystal-springs-repairs/article_ff5f5f42-df15-11e0-b34f-001cc4c002e0.html