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Final B-20 Soil Stabilization/Solidification Treatability Study Report
Section 1 - Introduction
Several lead-contaminated soils have been encountered during the course of investigation activities of solid waste management units (SWMUs) at Camp Stanley Storage Activity (CSSA). One method being considered for treatment of these soils is solidification/stabilization (S/S) with 14 percent, by weight, portland cement to soil mixture. The S/S technology has been deemed the best demonstrated available technology (BDAT) to treat metals contaminated soils by many industry experts.
S/S is an effective and fairly inexpensive method for treating contaminated soils prior to disposal. Treatment followed the Waste Analysis Plan as specified for stabilization, provided in Appendix A.
Three sites known to be contaminated with lead, SWMUs B-20, B-32, and B-33, are the subject of this treatability study. Approximately 225 cubic yards of lead-contaminated soils were solidified and stabilized using 14 percent, by weight, portland cement to soil mixture during April and May 1999. Total lead concentration values within the soil matrix ranged from 178 mg/kg to 364,989 mg/kg. Leachable lead concentrations from the soils associated with this treatability study ranged from 2 mg/l to 376 mg/l. The treatability study efforts are used to assess the efficacy of using S/S, as specified in the WAP, for treatment of soils to below federal hazardous and State of Texas class 1 non-hazardous levels for off-site disposal. Therefore, while activities performed for this treatability study take place at SWMUs B-20, B-32 and B33, the focus of this report is to demonstrate the ability of S/S to treat lead-contaminated surface soils at various sites at CSSA.