Final Remedial Action Completion Report for the ... - Rvaap.org

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Cmt.# Page # Line # New Page or Sheet Comment Shaw Environmental, Inc. 21 of 39 Recommendation Response PRG of 4.8 µg/L. There is no MCL standard for this compound. 3.2.8.3 Explosives and Propellants Concentrations of explosives were detected in groundwater samples at four well locations above the method detection limits and included the following compounds at the identified well locations: • 1,3-Dinitrobenzene – LL1mw084 (1.33 µg/L); • 2,4,6-Trinitrotoluene – LL1mw084 (9.18 µg/L) and LL3mw238 (65.1 µg/L); • 2,4-Dinitrotoluene – LL1mw084 (4.35 µg/L); • 2-Amino-4,6-dinitrotoluene – LL1mw081 (0.553 µg/L J), LL1mw084 (15.8 µg/L J), LL2mw267 (0.477 µg/L J) and LL3mw238 (2.84 µg/L); • 4-Amino-2,6-dinitrotoluene – LL1mw081 (0.563 µg/L J), LL1mw084 (21.9 µg/L), LL2mw267 (0.453 µg/L J) and LL3mw238 (26.6 µg/L and 26.3 µg/L ); • 4-Nitrotoluene - LL2mw267 (0.436 µg/L J); • HMX – LL1mw084 (0.417 µg/L J) and LL3mw238 (1.49 µg/L); • RDX – LL1mw084 (2.42
Cmt.# Page # Line # New Page or Sheet Comment Shaw Environmental, Inc. 22 of 39 Recommendation Response µg/L) and LL3mw238 (8.42 µg/L); and • 1,3,5-Trinitrobenzene (4.24 µg/L) and LL3mw238 (24 µg/L). All of the aforementioned explosive compounds, with the exception of 4nitrotoluene, were detected at well LL1mw084. The well with the highest concentrations for the individual explosive COCs was LL3mw238. Trinitrotoluene and RDX were above the Region 9 PRGs at both well locations. No propellants were detected in any of the baseline groundwater samples. 3.2.8.4 Inorganics In addition to MCLs and Region 9 PRGs, the inorganics detected above the laboratory reporting limits were compared to facility-wide background criteria for filtered groundwater. Calcium, magnesium, iron, potassium and sodium were eliminated from this discussion as potential on-site contaminants because they are considered essential nutrients. The following inorganic elements were detected above the reporting limits and applicable background levels: • Dissolved Arsenic – LL1mw081 (0.00102 mg/L), LL1mw082 (0.00191 mg/L), LL1mw085 (0.000427 mg/L), LL2mw262
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