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Title: Evaluation of solidification/stabilization for treating contaminated soils from the Frontier Hard Chrome site
Authors: Fleming, Elizabeth C.
Cullinane, M. John.
Keywords: Soil stabilization--Washington (State)--Vancouver
Chromium ions
Soils--Washington (State)--Vancouver
Soil pollution--Washington (State)--Vancouver--Heavy metal content
Publisher: Environmental Laboratory (U.S.)
U.S. Army Engineer Waterways Experiment Station.
Series/Report no.: Technical Report;EL-92-22
Abstract: Solidification/stabilization (S/S) of chromium in contaminated soils has proven to be one of the more intractable problems in applying S/S technology. This is particularly true when attempting to reduce the mobility of the chromium VI ion. The evaluation problem is compounded by the availability of numerous "proprietary" S/S mixes. This paper describes a study in which eight formulations were evaluated for their ability to reduce the mobility of chromium III and chromium VI. The physical and contaminant release properties of a generic formulation and formulations provided by seven vendors were evaluated in a rigidly controlled study conducted at the US Army Engineer Waterways Experiment Station. The suite of physical tests included unconfined compressive strength, wet/dry durability, permeability, moisture content, Atterberg limits, Proctor density, bulk density, specific gravity, slump, cracking, bleed water, and resistance to penetration. The Toxicity Characteristic Leaching Procedure (TCLP) and the first extraction of the Monofilled Waste Extraction Procedure (MWEP-1) were used to evaluate contaminant release and were performed by Radian, Inc. In general, all vendor formulations and the generic formulation resulted in significant improvements in the physical strength and durability properties of the soil. The results of contaminant release testing were less encouraging. Neither the generic formulation nor the vendor-supplied formulations produced a product capable of meeting the stringent 0.05-mg/L goal set for the MWEP-1. All formulations satisfied the TCLP goal of 5.0 mg/L. However, several formulations appeared to increase the mobility of chromium.
Appears in Collections:Technical Report

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