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

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Remedial Action Completion Report June 2008 • 1,3-Dinitrobenzene – LL1mw084 (1.33 µg/L) Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 3-6 • 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 µg/L) and LL3mw238 (8.42 µg/L) • 1,3,5-Trinitrobenzene (4.24 µg/L) and LL3mw238 (24 µg/L) All of the aforementioned explosive compounds, with the exception of 4-nitrotoluene, 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 (0.000313 mg/L J and 0.000268 mg/L J), LL2mw263 (0.0104 mg/L), LL2mw266 (0.00488 mg/L and 0.00554 mg/L), LL2mw267 (0.00438 mg/L), LL2mw269 (0.000623 mg/L J), LL3mw236 (0.000277 mg/L J), LL3mw238 (0.000434 mg/L J), LL3mw239 (0.000981 mg/L J), LL4mw196 (0.00709 mg/L J), LL4mw197 (0.000268 mg/L J) and LL4mw198 (0.000421 mg/L J) • Dissolved Antimony – LL1mw067 (0.00088 mg/L), LL1mw078 (0.000385 mg/L J), LL1mw084 (0.000322 mg/L J), LL1mw085 (0.000432 mg/L J), LL2mw262 (0.000315 mg/L J and 0.000422 mg/L J), LL2mw266 (0.000452 mg/L J), LL2mw267 (0.000525 mg/L J), LL3mw239 (0.00053 mg/L J) and LL4mw197 (0.000333 mg/L J) • Dissolved Barium – LL2mw269 (0.263 mg/L) • Dissolved Beryllium – LL1mw084 (
Remedial Action Completion Report June 2008 Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 3-7 • Dissolved Manganese – LL1mw078 (0.0559 mg/L), LL1mw081 (2.09 mg/L), LL1mw082 (0.693 mg/L), LL1mw084 (0.306 mg/L), LL1mw085 (0.613 mg/L), LL2mw262 (0.291 mg/L and 0.263 mg/L), LL2mw263 (0.837 mg/L), LL2mw266 (0.982 mg/L and 1.12 mg/L), LL2mw267 (0.594 mg/L), LL2mw269 (1.78 mg/L), LL3mw236 (0.599 mg/L), LL3mw239 (4.413 mg/L), LL4mw196 (0.115 mg/L) and LL4mw198 (1.23 mg/L) • Dissolved Nickel – LL1mw067 (0.0356 mg/L J), LL1mw081 (0.0114 mg/L J), LL1mw082 (0.00851 mg/L J), LL1mw084 (0.0554 mg/L), LL1mw085 (0.0135 mg/L J), LL2mw262 (0.0158 mg/L J and 0.0155 mg/L J), LL2mw266 (0.0125 mg/L J and 0.0119 mg/L J), LL3mw239 (0.0191 mg/L J) and LL4mw198 (0.044 mg/L) • Dissolved Selenium – LL1mw084 (0.00119 mg/L), LL2mw262 (0.00111 mg/L and 0.00116 mg/L), LL2mw266 (0.000945 mg/L J), LL2mw269 (0.000842 mg/L J), LL3mw238 (0.0013 mg/L) and LL4mw196 (0.000501 mg/L J) • Dissolved Thallium - LL1mw067 (0.000123 mg/L), LL1mw078 (0.000273 mg/L), LL1mw081 (0.000214 mg/L), LL1mw082 (0.000356 mg/L), LL1mw084 (0.00047 mg/L), LL2mw263 (0.0000555 mg/L J), LL2mw266 (0.000112mg/L and 0.000101 mg/L), LL2mw269 (0.000564 mg/L J), LL3mw236 (0.000509 mg/L), LL3mw238 (0.000377 mg/L), LL3mw239 (0.00123 mg/L), LL4mw196 (0.000649 mg/L), LL4mw197 (0.0002 mg/L) and LL4mw198 (0.000601 mg/L) • Dissolved Zinc – LL1mw084 (0.0993 mg/L), LL2mw267 (0.0679 mg/L J) and LL4mw198 (0.115 mg/L) All the concentrations listed above for dissolved manganese exceed the drinking water Secondary Standards. All the concentrations listed above for dissolved antimony, barium, beryllium, cobalt, lead, nickel, selenium, thallium, and zinc exceed the applicable background criteria. Arsenic concentrations exceeded the Region 9 PRG at all the well locations identified above. A dissolved arsenic concentration of 0.0104 milligrams per liter (mg/L) just exceeded the drinking water MCL of 0.01 mg/L at LL2mw263. None of the arsenic concentrations exceeded the background criteria of 0.0117 mg/L. 3.2.8.5 Pesticides and PCBs Concentrations of the pesticide 4,4’-DDT were detected in groundwater samples above the method detection limits at the following two well locations on LL 2: • 4,4’-DDT – LL2mw262 (0.0311 µg/L J, 0.0433 µg/L J, 0.0631 µg/L J and 0.075 µg/L J), LL2mw266 (0.022 µg/L J and 0.030 µg/L J) No PCBs were identified above the method detection limits in any of the groundwater samples collected. 3.3 MOBILIZATION AND SITE PREPARATION After pre-mobilization requirements were completed, equipment and personnel were mobilized to the RVAAP to prepare and organize for remedial activities. All personnel were trained and had the necessary certifications in accordance with the Safety, Health and Emergency Response *** FINAL***
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