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TCE causes cancer, other health woes, EPA says

Original post made on Oct 7, 2011

Despite political pressures to kill it, a long-delayed Environmental Protection Agency report has finally been released confirming the toxicity of the industrial solvent that has contaminated groundwater at a central Palo Alto Superfund site.

Read the full story here Web Link posted Friday, October 7, 2011, 3:14 PM

Comments (7)

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Posted by Bob Wenzlau
a resident of Crescent Park
on Oct 7, 2011 at 6:47 pm

Bob Wenzlau is a registered user.

I put up a post last week on this, and I appreciate the Weekly's coverage of this topic. Here is the post tagged to this article:

Palo Alto has a long-term burden that its shallow groundwater being impacted by Trichoroethene (TCE) and its degradation products. The source was in the 60s, 70s and 80s when it seeped from local industries into shallow groundwater, and then started migrating. One of the larger plumes is shown in this link below.

Map: Web Link

What is the impact? The contaminants seep into creeks where it contacts people and critters, poses a vapor intrusion risk to occupied basements, and poses a risk to contractors digging. Basement dewatering similar to the Oregon Expressway underpass can cause movement of these plumes over time, thereby exacerbating the problem.

An important development last week occurred in the scientific and environmental community where the toxicity of TCE has been clarified by USEPA. The news is not good, but should inform the seriousness we take the issue as we manage this over the future decades. "The USEPA is classifying TCE as carcinogenic to humans by all routes of exposure, based mainly on its high risk of causing kidney cancers, but also on Non-Hodgkin's lymphoma and liver cancer."

Here are some links where the coverage was originally flagged to me, with the USEPA statement as the third link:

Blog Post: Web Link

Blog Post: Web Link

USEPA Health Assessment: Web Link

My experience, is that the City could improve the attention to the issue and its long-term impact. The City has old maps of plume extent they use in the planning process - and they should be current. The Fire Department did not seem to respond well when releases from a broken recovery well were called in. Public Works employees who dig and work in these zones are not informed of hazards. I tried to stimulate engagement, but broadly, this does not gather the attention it might, and would encourage the City to engage deeper, and create a stronger dialogue with the potentially responsible parties. (This is a dialogue I am not part of, but experience dictates that the discussion maybe too cozy, and as such too much comfort is accidentally enjoyed - and folks aren't protected.)

Once again, Palo Alto can actually be a the forefront. Thousands of communities are impacted, and it has been difficult for local government to find its role when this is not a problem they caused or controlled its cleanup. It is not a spend issue, but rather a value that needs more strongly to be lifted up inside the city.

The sky is not falling, but we can do more to improve the longterm safe guards. These plumes proportionately affect a large portion of Palo Alto, and should be managed respectfully given the new found toxicity.


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Posted by Walter_E_Wallis
a resident of Midtown
on Oct 8, 2011 at 4:32 am

Walter_E_Wallis is a registered user.

So, we abandon everything built over the plume and then what???


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Posted by resident
a resident of Adobe-Meadows
on Oct 8, 2011 at 6:20 am

Trichloroethene (TCE), the chemical compound known to cause birth defects and cancer in lab animals, continues to contaminate groundwater in the California-Olive-Emerson neighborhood near California Avenue in Palo Alto, according to a report by Hewlett-Packard.

Based on a January HP quarterly TCE report, the Barron Park Association Foundation (BPAF), a nonprofit organization charged with monitoring TCE cleanup, identified several residential and commercial mixed-use properties that have soil-gas levels far higher than legally acceptable levels.

Namely, properties at 195 Page Mill Rd., 200 and 345 Sheridan Ave., and Birch Plaza are at risk, say foundation board members. "Most at risk is 200 Sheridan, where the two-level underground garage penetrates the aquifers, and the lower garage level periodically has contaminated ground-water leak inside," board member Bob Moss said. Moss is also a columnist for Palo Alto Patch.

The property at 200 Sheridan Ave. houses offices on the ground floor, a popular Italian restaurant called Caffe Riace and residential units on the upper floors. The owner of the building, Harold Hoback, said the building periodically had leakage in the garage during the last rainy season, Moss said. If the TCE-contaminated water has leaked into the garage, the toxins will evaporate into the air and can go into living spaces and expose people, Moss said.

Within the past year, Hewlett-Packard has tested 195 Page Mill Rd. for soil-gas levels of TCE, according to BPAF. Tests showed levels of "23,000, 25,000 and 150,000 micrograms/liter, far higher than any acceptable level for potential TCE exposure," stated a March BPAF letter to the San Francisco Bay Regional Water Quality Control Board. Environmental Protection Agency soil-gas action levels are 500 micrograms/liter for residential and 1,000 for commercial, according to Moss. This standard applies to Palo Alto; however, the water board has not enforced the levels, according to BPAF.

At 365 Sheridan Ave., the residential building "has an enclosed underground garage that is highly likely to experience vapor intrusion from both the aquifer and soils," BPAF wrote in a letter to the regional water quality control board.

BPAF has pestered the water board to perform official testing on contaminated buildings. The water board has had oversight for cleanup of underground-water contamination from the Hewlett-Packard 620-640 Page Mill Rd. Superfund site since 1991. Hewlett-Packard first found TCE leakage in 1981 from this site, said BPAF board president David Chalton. The company, which used TCE to clean electronics, occupied the premises during the 1960s, '70s and '80s. Leakage could have at any time during those years, Chalton said.

The water board has to do official testing in order to force Hewlett-Packard to clean up the mess, Chalton said. Yet the board has done nothing new to address increased levels of TCE in the groundwater, Chalton said. To date, it still has not done any testing on the identified buildings, said Chalton.

In the past, Hewlett-Packard has cooperated with other areas of cleanup, but "they don't want to spend the money unless required," Chalton said. "That's why we want the water board to do testing to see if TCE is really a problem or not. The water board has been reluctant to do that, and we have been trying to get the EPA to put pressure on it," he said.

"We've been fighting them for eight years to do indoor sampling and to require new buildings to have proper vapor barriers to prevent soil gas from getting into buildings," Moss said. "Basically, I've given up on the water board."

The city of Palo Alto must enact a law requiring developers to put in vapor barriers, Moss said. Palo Alto has not done anything because the water board has not recommended such barriers, he said.

Mountain View has had a city ordinance since 1993 requiring newly constructed buildings to have vapor barriers to prevent TCE gas from entering living and working spaces, Moss said. The EPA has aggressively cleaned up much of the contamination across 101 freeway from Moffett Field, he added. Nothing of the sort has happened in Palo Alto, he said.

"We already know the soil-gas levels at the Birch Plaza site are 6,400 micrograms/liter, which exceed action levels of 500 for residential and 1,000 for commercial," Moss said. "The Birch Plaza project still has no requirement for vapor barriers or indoor air monitoring." Last November, the City Council approved construction plans for Birch Plaza, at 305 Grant Ave.

"We're fed up with it," Moss said.

Cleaning up the mess requires a long process of pumping contaminated water out of the ground and filtering it, Chalton said. Palo Alto uses an outdated 20-year old pump-and-treat system, which is inadequate and has caused TCE buildup in some wells, according to Moss.

The "existing pump and treat system seems to have reached saturation in VOC removal" and "apparently will not reduce the levels of TCE to acceptable levels just by pump and treat," stated a BPAF letter to the water board. The BPAF has recommended a few alternatives to pumping, such as oxidation treatment and abiotic/biotic treatment.

Using the current pump-and-treat system would take 100 years to fully remove, the EPA and U.S. Navy has said, according to Moss. To date, however, neither the EPA nor the water board have done anything new to address ongoing high levels of TCE contamination in Palo Alto.
Web Link


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Posted by Bob
a resident of Crescent Park
on Oct 8, 2011 at 10:50 am

Walter, Your question might be rhetorical, but there is no rationale toward abandonment of property.

With knowledge, comes some smart steps.
1) If a basement is built that contacts the water, be sure it is vented or liners exist to hinder vapor migrating into the space.
2) If water is to be pumped out, is it treated?
3) If a contractor were to dig into the pollution, would they know. An excavation worker could wish to put health protection if they are in it.

I know your tendency is to view this as a governmental taint, but this is a toxic, and mostly advance knowledge guides proper handling. If someone doesn't care, so be it. But, many might, including a mom who might have a young child in a day care that could be above one of these plumes. Their concern should be honored, and they should know so they can do what they want.


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Posted by Walter_E_Wallis
a resident of Midtown
on Oct 8, 2011 at 3:28 pm

Walter_E_Wallis is a registered user.

Underground garages are always mechanically ventilated. Any unventilated underground space obviously should be ventilated. This would seem to solve the problem.


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Posted by Oooops
a resident of College Terrace
on Oct 11, 2011 at 8:27 pm

What is the status of the playing fields at El Camino and Page Mill? My understanding is that the old HP Site where these playing fields were built is also a Superfund Site {One of the retired workers in our neighborhood believes that this is one of the reasons the playing fields were built at this intersection "because the soil beneath the playing fields in contaminated." I believe that there is underground contamination across the street where there is another "below grade parking structure" Are our children and neighbors safe playing on these fields? Thanks!


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Posted by Anonymous
a resident of Adobe-Meadows
on Oct 29, 2011 at 10:50 am

So this is what happened to Steve Jobs


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