midland products

1/2 MI E ON HIGHWAY 10

Old Midland Products operated from1969 to 1979 as a wood preserving-treatment plant. However, aerial photographs indicate a saw mill may have been in operation as early as 1960. Former structures from past operations included several buildings used to house two saw mills, a wood-preserving treatment plant, raw material, waste storage lagoons, and water treatment settling lagoons. Historical activities at the site include treating lumber with creosote and pentachlorophenol (PCP). Treated lumber was allowed to dry in open areas to the east and west of the lagoon and treatment building locations. Effluent from the treatment process containing PCP and polycyclic aromatic hydrocarbons (PAHs) was discharged into waste lagoons. Waste lagoon overflows occurred with drainage entering the intermittent stream west of the lagoons. In addition, operation of the lagoons resulted in contamination of the shallow groundwater with an organic nonaqueous phase liquid and an associated dissolved organic liquid. On March 24, 1988, the EPA issued a Record of Decision (ROD) selecting a remediation alternative for the site that included onsite thermal incineration of contaminated soils, sludge, and sediments. This remedy also included extraction and treatment of contaminated groundwater. Following the successful treatment of the contaminated solid materials at the site, contaminated groundwater was treated onsite from 1994 to August 2006 (with a 2-year hiatus). In February 2006, an Amended ROD was issued, which changed the remedy to a Technical Impracticability Waiver for the area of highest contaminant concentration in groundwater and the selection of Monitored Natural Attenuation to address the dissolved groundwater contaminant plume. Institutional Controls are also included as a component of the amended ROD to provide additional risk reduction by controlling exposure to site groundwater.

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