Soil vapor testing results analyzed for Stony Hill Road area

RALEIGH – State officials say 12 of 14 residential properties tested in Wake Forest’s Stony Hill Road area do not have any below-ground soil vapor detections for trichloroethylene and perchloroethylene or were below screening levels for those contaminants.
The N. C. Division of Waste Management released results Wednesday of below-ground vapor testing conducted the week of Oct. 15 at 14 properties that include 16 homes in the Stony Hill Road area of Wake Forest. The state agency received and analyzed those results.
The soil vapor tests detected that two of the 14 properties were above levels of concern for trichloroethylene, or TCE, and perchloroethylene, PCE. One property is an empty lot used as a sample location because it was adjacent to a home where state officials were not able to get permission to access the property for sampling at the time of testing. The other location was a home that had received a clean result from crawl space testing.
Also, one of the 14 properties where testing was conducted indicated the presence of 2-proponol, a contaminant commonly known as rubbing alcohol. The presence of this contaminant could possibly be attributed to its use in the laboratory process. Officials will conduct follow-up testing at this location.
TCE and PCE are chlorinated solvents. Officials believe the solvents found in private wells in the Stony Hill Road area came from small circuit board assembly companies.
In addition to below-ground soil vapor testing, three properties close to the source of the contamination were sampled in crawl spaces. Chlorinated solvents were not detected in any of the three crawl spaces.
Risk assessment evaluations used in studying sampling results were reviewed by toxicologists from the N.C. Division of Waste Management and the Environmental Protection Agency.
The N.C. Division of Waste Management will conduct additional vapor testing in the next 30 days.
Residents tested for soil vapor were notified Tuesday of sampling results for their individual homes.
State and federal officials do not believe that TCE contamination recently discovered 1.7 miles away in Wake Forest’s Mangum Estates neighborhood is connected to the Stony Hill Road area contamination.
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