After several years of exploration, the East Pikeland Planning Commission has just recommended a plan to build an elementary school on land contaminated with VOC's (including TCE). Last week, the Daily Local News (West Chester, PA) reported the unanimous recommendation was made to the Board of Supervisors. Now, presumably, the Board will consider the issue.

Back in 2006, the Planning Commission summarized the history of the site and outlined their major environmental concerns regarding school-building there:

[Attorney Christopher] Roe explained that across Coldstream Road from the proposed school site the Henry Company site has long been the subject of environmental investigation and clean-up under the direction of the United States Environmental Protection Agency (USEPA). Ciba-Geigy, a chemical company, operated there in the 1950s and early 1960s. USEPA has identified lagoons that were used for disposal in that area and are the likely source of solvent contamination in the groundwater. The lagoons were excavated in 1984, but the monitoring and clean-up of groundwater continues.

In the 1980s groundwater monitoring wells were installed on nearby properties to determine how far contaminants had spread. These off site wells included four that were installed on what is now the Kimberton Elementary School property. Two of the wells on the north northeast side of the Kimberton School property have never shown the presence of any solvent contamination. A third well, on the east side of the property along Rt.113, has shown low levels, at or below clean-up standards. The fourth well, monitoring well MW-17 –along the southwest edge of the property – has consistently shown elevated levels of solvent contamination.

Phoenixville Area School District (PASD) will not use groundwater from the property for any purpose. Despite this, PASD and its advisors met with and are working with USEPA and the Pennsylvania Department of Environmental Protection (PADEP) to insure that the presence of the contaminants in the groundwater below part of the property will not pose unacceptable risks to employees or students.

PASD is actively engaged in two steps toward this goal. First, PASD has directed that the designers of the school building follow and implement USEPA guidelines for ensuring that school buildings are protected from subsurface vapors.

Second, PASD has hired environmental specialists to install additional groundwater monitoring wells to better define the areas of the property under which contaminated groundwater may exist, including the concentrations and water elevations.

Given the history of the use of the property, another issue that PASD is having its environmental advisers fully evaluate and address is the appropriate handling of the construction debris and other fill materials, including a small area reportedly used as a town disposal area in the 1960s or earlier. PASD’s consultant will submit a plan for the handling of the fill materials that will be reviewed and approved by PADEP before actual construction work begins.

A quick poke around EPA's website reveals a bit more detail regarding the history of the Henry Co./Ciba-Geigy contamination site:

In 1981 volatile organic compounds (VOCs) were detected in monitoring wells. As a result, a series of initial clean-up actions took place including removal of drums, excavation of the lagoons, and treatment of residential wells. In 1992 a public water system was built providing water to residences and businesses around the site. Approximately 500 people live within a one-mile radius of the site. A small stream that crosses through the site is the discharge point for local groundwater. Less than one-mile from the site is French Creek, a public recreation and fishing area.

[...]

Threats and Contaminants
During routine water quality testing in 1981, contamination in a well on the site was detected. The lagoons were identified as a source of contamination at the site. The groundwater is contaminated with volatile organic compounds (VOCs), including trichloroethene [aka trichloroethylene], dichloroethene, and vinyl chloride. A tributary to French Creek was also contaminated with VOCs.

[...]

Cleanup Progress
In the past ten years, over 3,000 pounds of VOCs, mainly TCE, have been removed by the groundwater treatment system. The groundwater and surface water are regularly monitored and this information is reported to EPA. EPA completed a five-year review of the site on September 30, 2004 and found that the remedy is protective of human health and the environment. The next five-year review will be due by September 2009.

Though online sources do not appear to reveal the levels of contamination at the adjacent contaminated property or under the proposed school, plans to build a geothermal system into the proposed school reportedly have been scrapped because of the vapor intrusion risk associated with drilling into the soil.

We can't help but wonder: If the soil is so contaminated that drilling into it may exacerbate vapor intrusion, do you really want to put a school there?

Apparently we're not the only ones concerned. In an opinion letter published this past Sunday in the Daily Local News, West Chester resident Bruce Molholt Ph.D., an independent environmental consultant and a part-time professor at the University of Pennsylvania's Institute for Environmental Studies whose research interests include "environmental factors which exacerbate cancer incidence among children," writes:

As a toxicologist who has investigated many schools built upon ground containing chlorinated solvents, this situation looks potentially dangerous to future schoolchildren whether or not a geothermal system is put in place.

The problem is that chlorinated solvents underground are degraded by soil bacteria to vinyl chloride, a carcinogenic gas. This carcinogenic gas migrates upwards, much like radon, and may accumulate in buildings on top of contaminated soil.

In one such school built in 1965 atop a trichloroethylene (TCE) dump in Marion, Ohio, I found that the leukemia rate in schoolchildren was three times that expected. Upon my recommendation, the local school board finally moved the school to another location. Obviously this unwise location caused both inestimable human trauma and great expense to the school district.

Bruce Molholt
West Chester

If any readers know the actual levels of contamination found at or near the site, please contact us via the link above or send an email to tceblog [at] gmail.com. Meantime, we'll try to keep you posted as we learn more.