Last updated Nov. 29, 2017

What We Know

Dawson Metal Products originally constructed the former manufacturing facility at 221 Sunset Drive. It was reported to the Missouri Department of Natural Resources that on July 10, 1972, there was a fire at the 221 Sunset Drive facility. Operations temporarily moved to a building located at 1225 US Highway 54 in Camdenton, known at the time as the Cox building. Now the building is referred to as the Dawson Metal Products Camdenton Facility #2 (DMPF #2). The property is currently owned by Dickerson Building, LLC and occupied by Laker Co. During operations at the DMPF #2 site, former employees have reported that waste trichloroethylene (TCE), a volatile organic compound (VOC) used in degreasing operations, was disposed of out the back loading dock door onto the ground for approximately one year.

Investigations

The department interviewed former employees and conducted a site visit in August 2017. Following the Superfund investigative process, the department has completed a Pre-CERCLA Screening Report and an Abbreviated Preliminary Assessment Report documenting the potential release of TCE into the environment. The reports recommend entry of the site onto the U.S. Environmental Protective Agency's active sites inventory and further investigation.

update Site Inspection Investigation Sampling Results

On Oct. 2-4, 2017, a CERCLA Site Inspection sampling event was conducted at DMPF #2 site that included collection of samples of soil as well as the air inside, outside and under the facility (subslab vapor) at 1225 US Highway 54 and drinking water wells and springs within one mile of the facility.

Soil Results (posted 11/29/17)

The department collected a total of 23 soil samples from nine borings at depths ranging from zero to 17 feet in the loading dock area on the northeast portion of the facility. Soil sample locations are shown on the figure below. All samples were analyzed for VOCs. TCE was detected in 14 of the 23 soil samples. TCE breakdown products, including cis-1,2-dichloroethene and vinyl chloride, were also detected in many of those samples.

Soil data results show contamination in the loading dock area, and did not indicate any current surface exposure threat to human health. Further sampling will be needed to determine the full extent of contamination. Soil sample results are presented in a table below along with health-based benchmarks for comparison. Also included are the analytical laboratory data sheets for the soil samples and a document with helpful tips on how to interpret the data.

Air Results (posted 11/29/17)

The department collected a total of 14 subslab vapor, 13 indoor air and two ambient outdoor air samples. All air sample locations are shown on the figure below. All samples were analyzed for VOCs. TCE was not detected in the outdoor air. TCE was detected in five of the 14 subslab vapor and eight of the 13 indoor air samples.

Indoor air concentrations of TCE and other VOCs detected in the DMPF #2 building do not exceed health-based action levels. The concentrations of TCE in subslab vapor in one area of the building, closest to the loading dock, are elevated above subslab action levels. This data, along with detection of TCE in the indoor air, indicates that some vapor intrusion is occurring in the building in Rooms 1, 2 and 3 near the loading dock. Air sample results are presented in the tables below along with health-based action levels for comparison. Analytical laboratory data sheets for the air samples are also included below.

Water Results (posted 10/25/17)

The department collected samples from 17 private drinking water wells, one public drinking water well (Blair Heights Well) and two springs within one mile of the site. All samples were analyzed for VOCs, including TCE. No VOCs were detected in any of the water samples. Below are the results for the Blair Heights Well and a document with helpful tips on how to interpret the data.

Path Forward

Based on current information, there is no evidence of TCE exposure to DMPF #2 building employees above health based action levels. Additional air sampling will be conducted in January 2018 to verify these conditions. (posted 11/29/17)

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