Kevin Bjella

Representative Sampling for Energetic Compounds at Military Training Ranges

Abstract Field sampling experiments were conducted at various locations on training ranges at three military installations within North America. The areas investigated included an anti-tank range firing point, an anti-tank range impact area, an artillery-range firing point, and an artillery-range impact area. The purpose of this study was to develop practical sampling strategies to reliably estimate mean concentrations of residues from munitions found in surface soil at various types of live-fire training ranges. The ranges studied differ in the types of energetic residues deposited and the mode of deposition. In most cases, the major source zones for these residues are the top two or three centimeters of soil. Multi-increment sampling was used to reduce the variance between field sample replicates and to enhance sample representativeness. Based on these criteria the results indicate that a single or a few discrete samples do not provide representative data for these types of sites. However, samples built from at least 25 increments provided data that was sufficiently representative to allow for the estimation of energetic residue mass loading in surface soils and to characterize the training activity at a given location, thereby addressing two objectives that frequently are common to both environmental and forensic investigations.

Subsampling Variance for 2,4-DNT in Firing Point Soils

At 105-mm howitzer firing points, 2,4-DNT is detectable in the surface soils, but field sampling and laboratory subsampling uncertainty can be large during quantitation. The 2,4-DNT is in particulate form, within fibers or slivers of the nitrocellulose-based propellant. The slender fibers range up to 7.5 mm in length with masses of several 100 μ g. Size fractionation of a firing point soil revealed that most of the 2,4-DNT was in the 0.595- to 2.00-mm size range, although the bulk of the soil was less than 0.6 mm prior to grinding. Machine grinding for five minutes was needed to pulverize the propellant fibers sufficiently so that estimates of 2,4-DNT were reproducible in replicate analytical subsamples. To determine 2,4-DNT, we have adopted the practice of grinding firing point soils for five one-minute intervals, with time for heat dissipation between grinds, prior to obtaining individual or replicate 10-g subsamples.

Comprehensive approach for monitoring and remediating petroleum-derived contaminants in the Arctic : case study of the former NARL site near Utqiaġvik, Alaska (formerly Barrow)

The Arctic region of Alaska has a history of petroleum contamination from repetitive fuel spills and the overuse of petrochemicals. Notably, the presence of the former Naval Arctic Research Laboratory (NARL) outside the city of Utqiaġvik, Alaska (formerly known as Barrow), resulted in the contamination of local soils and groundwater with petroleum-derived hydrocarbons. Since the NARL closure in 1987, the U.S. Navy (primarily) has implemented many environmental investigations, remediation, monitoring, and containment strategies. However, the soil and subsurface soil unique to the Arctic complicates traditional remediation techniques as a result of the harsh environment and underdeveloped infrastructure of the remote site. Bioremediation and stimulating the existing microbial community represent attractive methods of decontamination because they are nontoxic and relatively easy to implement. The results from this study offer a comprehensive approach for characterizing petroleum-derived contamination specific to Arctic regions by coupling nondestructive geophysical tools with in situ hydro-biogeochemical methods. The overall goals of this project were to investigate the surface and subsurface soil properties at the former NARL site for the Naval Facilities Engineering Command Northwest, monitor the distribution of hydrocarbons, characterize petroleum-derived hydrocarbons, and test various bioand phytoremediation scenarios both in the laboratory and as a field study. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. ERDC/CRREL TR-18-18 iii