SECTION TWO
Operable Unit Background
REMEDY SELECTION
Based upon CERCLA requirements and a detailed analysis of the alternatives, USEPA and the
Texas Natural Resources Conservation Commission (TNRCC) recommended incineration of all
soil and buried waste within the SCS Site boundary down to the groundwater table. The selected
remedy was deemed:
To be protective of human health and the environment,
To meet all applicable or relevant and appropriate federal and state requirements
(ARARs), and
To be cost-effective.
This remedy satisfies the statutory preference for remedies that employ treatment that reduces
toxicity, mobility or volume as a principal element and utilizes permanent solutions and
alternative treatment technologies to the maximum extent practicable.
The selected remedy for the SCS Site included:
Excavation of approximately 252,000 cubic yards (CY) of contaminated sludge, soil, and
sediments,
Treatment of excavated materials in an on-site mobile rotary kiln incinerator,
Backfilling all excavations (potentially with incinerator ash), and
Installation of a vegetative cover.
CLEANUP GOALS/STANDARDS
The following table lists the remediation objectives for soil treated in the incinerator operated at
the SCS Site. These objectives were established in the September 1988 ROD to meet TNRCC
requirements.
Treated Soil Objectives
Cleanup Level
Contaminant
(g/kg)
Volatile Organics
Benzene
100
Chlorobenzene
10,000
1,2-Dichloroethene
7,000
Ethylbenzene
70,000
Tetrachloroethane
2,000
Toluene
100,000
Trichloroethene
2,000
2-1
Slippery Chemical OU 3 Final RA Report
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