Construction crews work on a pump storage project at the bottom of a 100-foot hole next to Lake Hodges in Escondido last week.
JAMIE SCOTT LYTLE Staff Photographer
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By: QUINN EASTMAN - Staff Writer | ∞
Construction crews work on a pump storage project at the bottom of a 100-foot hole next to Lake Hodges in Escondido last week.
DEL DIOS ---- The San Diego County Water Authority's progress in building a pipeline between Lake Hodges and Olivenhain Reservoir makes long-standing concerns about treating Hodges' sometimes green water more urgent, water officials said last week.
The idea of mixing Lake Hodges' sometimes green water with cleaner Olivenhain Reservoir water has posed treatment concerns to water officials for the last few years, but a theoretical problem is about to become a practical one.
Blasting for a 1.25-mile tunnel under Del Dios Highway finished last summer and the pipeline almost connects the man-made Hodges just south of Escondido and the reservoir over the hills to the west.
Construction of the underground pump station that will move Lake Hodges water has moved into high gear. Contractor Archer Western has been working double shifts to excavate the 120-foot hole that will contain the pump station and is scheduled to be finished next year.
"I think the water-quality issue has become imminent because pump storage is supposed to start in September 2008," said Kim Thorner, general manager of the Olivenhain Municipal Water District, last week.
The pipeline and pump station are part of the San Diego County Water Authority's Emergency Storage Project, designed to move water around the county in case of an emergency such as an earthquake.
The pump station is expected to add 40 megawatts to the region's peak power capacity, enough for 26,000 homes, Water Authority construction manager Jeremy Shepard said Tuesday.
It is also expected to make money ---- $5 million per year, by some estimates ---- by pumping water uphill at night when electricity is cheap and having it flow downhill to make electricity during the day.
But the Olivenhain water district, which includes parts of Encinitas, Carlsbad, Rancho Santa Fe and 4S Ranch, is objecting to allowing Hodges water to mix with the reservoir water it taps for its customers. District officials are discussing legal action to prevent it, according to a presentation by Thorner.
Lake Hodges contains levels of decaying organic matter and manganese that will foul Olivenhain water treatment equipment, the presentation says.
Rain washes sediment, oil and fertilizers from 250 square miles into the artificial lake, whose water level has fluctuated widely in the last few years.
A drought in the 1990s left the lake's waters low enough to allow willow trees to grow in shallow areas near Interstate 15, but the wet winter of 2004-05 flooded the trees.
Engineering studies say that upgrading Olivenhain's McCollum treatment plant to handle Hodges water could cost between $40 million and $60 million, Thorner said.
A joint committee of Water Authority member agencies has started work on an operations plan that will say when water can be moved in and out of Lake Hodges, Water Authority spokesman John Liarakos said Tuesday.
A draft plan is expected in November.
The operations plan will probably have "trigger points" for Hodges' water contaminant levels when the pipeline will need to be shut off, he said.
The operations plan will also say how much the level of Lake Hodges can be expected to rise and fall, but Liarakos said it will probably be less than a foot. Moreover, the pump station can be expected to be more active in the summer when the region's electricity demand is higher, he said.
Although the city of San Diego owns Lake Hodges and its dam, the city doesn't get any water from the lake. The Santa Fe Irrigation District gets about 30 percent of its water from Lake Hodges, which is treated at its R.E. Badger Filtration Plant.
State bond money could be available for either the Olivenhain district or the city of San Diego if an expensive technical fix is necessary.
Contact staff writer Quinn Eastman at (760) 740-5412 or qeastman@nctimes.com.
Web links:
http://www.nctimes.com/articles/2005/07/26/news/inland/20_59_557_25_05.txt
Recent Hodges algae bloom
http://www.nctimes.com/articles/2006/12/09/news/inland/21_50_2212_8_06.txt
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RJ wrote on Jul 8, 2007 10:12 AM:Where is the common sense? If the incompetents in charge of Lake Hodges would have removed those willow trees before the lake (predictably) filled back up, we wouldn't have this problem. Now the taxpayers will end up spending millions cleaning up the whole mess. The willow trees should have been removed despite fears of lawsuits over the destruction of “habitat” by environmentalists. I think the birds are capable of flying to another tree. In fact they have since the only thing left of the habitat is dead rotting branches…
San Marcos resident wrote on Jul 8, 2007 12:07 PM:The problem isn't only the trees, it is also the nutrients from fertilzers and sewage, which can lead to blooms of cyanobacteria, aka toxic algae blooms, aka blue green algae. Is there a bga bloom in Hodges? If so, it poses more of a problem than just smelly, musty drinking water. Some strains of cyanobacteria release toxins that have lead to documented cases of dog deaths,and pose a serious concern for public health. The EPA and the State Water Board are giving this growing problem the serious concern it deserves. Check out the California State Waterboard website for the newly-posted report on voluntary measures to be taken on recreational lakes suffering from bga's. Today they will be voluntary; tomorrow they will be mandatory. We are reaping what we sowed for years of ignorance and shortsightedness about how we develop around water.
GFN wrote on Jul 8, 2007 12:54 PM:Four years ago water officials were told to remove the trees or this would happen. Who were those fools who refused to do so?
Read Me wrote on Jul 8, 2007 4:17 PM:GFN, did you read the post from San Marcos Resident? Even if those trees had been removed, there likely would be issues with the water quality of California's largest drainage ditch. Somebody correct me if I am wrong, but didn't Olivenhain get built with the Lake Hodges issues in mind? If they weren't prepared for the crap that would come into the system from Lake Hodges, then there is a (mis)design issue, I would think. Too ... bad.
RJ wrote on Jul 8, 2007 5:04 PM:There was an algae bloom at Hodges recently. Dead fish were piled all over the place... Anyone care for a drink?
Looking back a few years... wrote on Jul 8, 2007 7:12 PM:1994 article: "Two tiny birds could have something to say about construction plans. Officials say they expect to find the southwestern willow flycatcher and least Bell's vireo, both on the federal endangered species list, living in the vegetation on the lake bottom. The U.S. Fish and Wildlife Service has issued a permit to the water authority to clear vegetation from the lake. But the permit specifies that the habitat of no more than 36 pairs of least Bell's vireos and nine pairs of southwestern willow flycatchers can be removed. No one knows how many of the two species are living on the lake bed. Purcell said the water authority plans to conduct surveys in March 2006 and March 2007 to determine the number. If it exceeds the permit's limitations, the authority would ask to amend the permit to allow the habitat of more birds to be destroyed. Officials hope to begin clearing brush in October 2007, after the birds' breeding seasons. "Of course, the other option is to do nothing and let the reservoir refill naturally," Purcell said. "The problem again, though, is vegetation. The water will rise above the leaves and what not, and they'll rot and put a lot of organics in the water and that causes some headaches for water treatment plants."
AW wrote on Jul 9, 2007 10:57 AM:Hodges has become worse over the years. It was only recently in 2002 added to the list of impaired water bodies by the EPA Clean Water Act.
janet wrote on Jul 17, 2007 8:32 AM:Please pay attention and educate yourselves. The trees are a minor problem. The big problem is runoff from fertilizer, oil and all manner of things that wash into the lake, as well as sewage leaks. Most people in the watershed fertilize their yards, particularly lawns. They apply pesticides and herbicides. In addition, there are a number of farms in the watershed. When it rains, these chemicals wash into the lake. For every tree out there, there are hundreds, maybe thousands, of people in the watershed who indirectly put pollution in the water. As usual, it is easier for people to blame environmentalists than themselves.
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