During the oil and gas boom of the 1880s and 1890s, the glass industry was drawn to Blackford County, Indiana. The industry used arsenic and lead in manufacturing the glass, and since there were no regulations about handling hazardous materials at the time, they could have left behind contaminated soil.
Arsenic is a carcinogen. Arsenic and lead are neurotoxins. They do not break down over time.
Blackford County Concerned Citizens in partnership with the Hoosier Environmental Council tested soil at some of the glass factory sites. The sampling and lab analysis were generously donated by EnviroForensics and Envision Laboratories.
Click here to see a 4-minute video about the project.
Map of sampling sites in Hartford City at the former site of American Window Glass Company
Sampling sites in Montpelier at the former site of National Window and Bent Glass Company
Results for Montpelier
The results for Montpelier are in the table available here. The Montpelier samples had the same levels of arsenic and lead as soil generally does in this part of Indiana. A single sample from the dirt parking area had an arsenic level slightly above background, but well within the recreational field standard.
Results for Hartford City:
All of the results for Hartford City are in the table available here. The samples from the grounds at Southside Elementary are SE-5 and SE-9 through SE-15, the rest are from around the Babe Ruth baseball field.
All of the samples taken on the grounds of Southside Elementary had arsenic and lead levels within the range expected in Indiana soil.
Samples from the baseball field show some focally elevated concentrations. Three of the surface samples (0 – 0.5 feet) have arsenic concentrations above Indiana’s residential standard of 9.4 milligrams per kilogram of soil (abbreviated mg/kg) but well within the recreational field standard of 130 mg/kg:
- 14 mg/kg at SE-2 ( Spring Street edge of the property)
- 12 mg/kg at SE-3 ( Spring Street edge of the property)
- 22 mg/kg at SE-4. (just north and west of the outfield)
Some of the deeper soil samples have higher concentrations, but people are not likely to be exposed to that soil unless it is disturbed. At SE-7 and SE-8 along 7th street the soils 0.5 – 2.0 feet deep have arsenic concentrations as high as 42 mg/kg. The sample with the highest surface arsenic (SE-4), also has an arsenic concentration of 36 mg/kg at 0.5 – 1.0 feet deep. These are also above Indiana’s residential standard but well within the standard for recreational fields (IDEM, 2015).
An elevated concentration of lead was found in one sample, SE-4, at 0.5 – 1.0 feet deep. It had a concentration of 446 mg/kg which is higher than the residential standard of 400, but lower than Indiana’s recreational field standard, which is 800 mg/kg.
According to the US Geologic Survey (Smith et al., 2013) soil from north central Indiana has
- arsenic 2.2 – 9.7 mg/kg
- lead 8.2 – 78.5 mg/kg .
The arsenic and lead found at this site are high enough that they were most likely left behind by the glass factory.
1. Avoid soil exposure. While the site is safe for recreational use, it never hurts to reduce exposure to soil containing lead and arsenic. These precautions have the added benefit of reducing exposure to any lawn chemicals that might be used at the site.
- Don’t let children get the soil in their mouths
- After spending time there, wash your hands and children’s hands
- Wash clothes that have soil on them (like baseball uniforms)
- Leave shoes that have been to the site at the door, don’t wear them into your home
2. Keep the soil planted. Plants, including grass, hold soil in place and reduce the chance that people will be exposed to soil contaminants.
3. Remediate the soil if the property use changes. There are a total of five sample locations around the Hartford City baseball field where the arsenic concentration exceeds the Indiana standard for residential properties and one that exceeds the residential standard for lead. These arsenic and lead concentrations would need to be addressed before the property could be used for housing.
Arsenic in soil is taken up by certain types of plants, so this property should not be used for growing food until the soil has been remediated.
Indiana Department of Environmental Management (2015). Office of Land Quality Screening Levels. www.in.gov/idem/landquality/files/risc_screening_table_2015_explanatory.pdf
Smith, D.B., Cannon, W.F., Woodruff, L.G., Solano, F., Kilburn, J.E., & Fey, D.L. (2013). Geochemical and mineralogical data for soils of the conterminous United States: U.S. Geologic Survey Data Series 801, 19p., http://pubs.usgs.gov/ds/801/