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Final B-20 Soil Stabilization/Solidification Treatability Study Report
Section 4 - Treatability Study Results and Data Evaluation
4.0 - Initial Baseline Soils Sample Data
The B-32 and B-33 samples collected prior to S/S (April 14, 1999) were analyzed for total explosives and TCLP lead. The resulting TCLP lead concentrations were 14.4 mg/l for B-32 and 2.01 mg/l for B-33. No explosives were detected for either site. Results obtained from a previous benchscale treatability study indicate that treated B-20 soils, (metallic lead particulate removed) had an average TCLP lead concentration of 21.7 mg/l (Brice, 1998).
4.1 - System Performance Soils Sample Data
SWMU B-32 and B-33
The first round of S/S and sampling for B-32 and B-33 (April 27, 1999) yielded trace explosives at B-32 and high TCLP lead results for both sites. The TCLP lead concentration was 160 mg/l for B-32 and 16 mg/l for B-33. These results are higher than the untreated soil lead TCLP concentrations. Parsons ES suspects that insufficient cure times for the S/S samples caused unfavorable analytical results. Trace explosives were detected at B‑32.
To confirm the theory of insufficient cure times, another round of S/S and analysis for soil samples at SWMUs B-32 and B-33 was performed. The resulting TCLP analytical data for lead from both sites were below project method detection limits.
SWMU B-20
The first round of stabilized soils was collected from SWMU B-20 small ammunition disposal areas on April 14, 1999. Analytical results from these samples ranged from 236 mg/l to 376 mg/l, with no explosives detected above the project reporting limits. However, due to sample integrity and shipment errors, an additional effort of stabilization and sampling took place for B-20 soils on April 27, 1999. The TCLP lead concentration was 359 mg/l while trace explosives were detected.