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Record of Decision System (RODS)



Address:  RTE 28 & SPRING HILL ROAD 
City & State:  HARRISON TOWNSHIP  PA  15065
EPA ID:  PAD980712798
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-92/147
ROD Date:  03/31/1992
Operable Unit(s):  01
Media:  Soil, sediment, Debris, groundwater, Metals.
Contaminant:  VOCs, other organics, metals.
Abstract:  SITE HISTORY/DESCRIPTION: The 61.8-acre Lindane Dump is located in the Allegheny River Valley in Harrison Township, near Natron, Pennsylvania. Land use in the area is mixed residential, commercial, recreational, manufacturing, and special use. The site is divided into both upper and lower project areas separated by steeply sloping areas. The majority of both the upper and lower areas have been graded and form terraces on the hillside extending from the residential areas, located north and northeast of the project site. The upper area consists of fill and waste materials. The Allegheny River, which is the major surface water stream in the area, provides the public drinking water supply for the Township. From 1850 to 1980, the lower portion of the site, the 47.5 acres owned by the Allegheny Ludlum Corporation, was used for waste disposal. The area beneath the site was mined extensively for coal from the latter part of the 19th century to the first halfof the 20th century. In 1985, Pennsylvania Salt Manufacturing Company (later known as Pennsalt, then Pennwalt) used the site for waste disposal of mining tailings and cinders. Tailings from the mining operations and cinders (bottom ash) from steam and electrical power generation at the plant were placed onsite, and sulfuric acid was produced at the Pennsalt plant. This operation was discontinued prior to 1920 and resultant cinder and slag, along with cryolite ore tailings, BHC (Lindane) filter cake residuals containing pesticides, and waste sulfuric acid containing DDT were disposed of onsite. In 1965, after the property was sold to Allegheny Ludlum Corporation, other wastesincluding construction wastes, industrial waste treatment plant sludge, coke, rubber tires, and slag-were disposed of onsite. During 1976 and 1977, the Alsco Community Park was constructed by the Harrison Township on a 14.3acre tract of the upper site area that had been previously used as a waste disposal site. In addition, fill material from an unknown source was placed and graded into the park. This ROD addresses onsite contaminated soil and controlling ground water and surface water contamination. The primary contaminants of concern affecting the soil, sediment, debris, and ground water are VOCs, including benzene; other organics including pesticides such as DDT, Lindane, and phenols; and metals, including arsenic and lead. PERFORMANCE STANDARDS OR GOALS: Chemical-specific goals for leachate and shallow ground water clean-up goals are based on the more stringent Pennsylvania state water quality criteria standards or SDWA MCLs, and include gamma BHC (Lindane) 0.2 ug/l and benzene 5 ug/l. An ARAR waiver is being issued for ground water based on technical impracticability of capturing all ground water due to the complex hydrogeologic conditions at the site, the possibility of subsidence and site damage due to extensive pumping, and the potential for migration during the pumping. INSTITUTIONAL CONTROLS: Institutional controls including deed restrictions will beimplemented to prevent any activities that may compromise the integrity of the cap.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes installing a multi-layer cap where side slopes are stabilized; constructing a combination clay and soil cap where site slopes are unstable, and vegetating the capped areas; upgrading the existing leachate/shallow ground water collection system, and treating leachate and shallow ground water using air stripping, with onsite discharge to the Allegheny River; disposing of sludge generated during the treatment process offsite at an approved facility; constructing and maintaining a perimeter fence; monitoring ground water and surface water; restoring the Alsco Community park; and implementing institutional controls, including deed restrictions. The estimated present worth cost for this remedial action is $14,122,500, which includes an annual O&M cost ranging from $634,000 to $634,700 for 30 years.
Text:  View full-text ROD [ 74K ]
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