Final Remedial Action Completion Report for the ... - Rvaap.org
Final Remedial Action Completion Report for the ... - Rvaap.org
Final Remedial Action Completion Report for the ... - Rvaap.org
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<strong>Remedial</strong> <strong>Action</strong> <strong>Completion</strong> <strong>Report</strong><br />
June 2008<br />
Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4)<br />
Page 3-5<br />
established screening levels. A summary of analytical results <strong>for</strong> <strong>the</strong> Shaw baseline groundwater<br />
sampling event are presented in <strong>the</strong> data summary tables (Table B-1) in Appendix B. The<br />
Kemron laboratory report and associated evaluation report <strong>for</strong> groundwater are presented in<br />
Appendix C in <strong>the</strong> electronic attachment.<br />
3.2.8.1 Volatile Organic Compounds<br />
Low level concentrations of VOCs were detected in groundwater samples above <strong>the</strong> method<br />
detection limits at all four load lines and included <strong>the</strong> following compounds at <strong>the</strong> identified well<br />
locations:<br />
• Chloromethane – LL1mw078 (0.935 µg/L J), LL1mw081 (0.514 µg/L), LL1mw082<br />
(0.378 µg/L J), LL1mw084 (0.559 µg/L J), LL1mw084 (0.342 µg/L J), LL2mw262<br />
(0.413 µg/L J and 0.324 µg/L J), LL2mw263 (0.567 µg/L J), LL3mw236 (0.561 µg/L J),<br />
LL3mw238 (0.430 µg/L J), LL3mw239 (0.317 µg/L J), LL4mw197 (0.307 µg/L J) and<br />
LL4mw198 (0.333 µg/L J)<br />
• Acetone – LL1mw082 (3.28 µg/L), LL3mw239 (17.7 µg/L)<br />
• Trichloroe<strong>the</strong>ne – LL1mw085 (0.259 µg/L J)<br />
• Chloro<strong>for</strong>m – LL2mw267 (0.366 µg/L J) and LL3mw239 (0.335 µg/L J)<br />
• Carbon Disulfide – LL3mw239 (0.557 µg/L J)<br />
• 2-Butanone – LL3mw239 (4.1 µg/L J)<br />
• Toluene - LL3mw-239 (0.316 µg/L J)<br />
The location where <strong>the</strong> most VOCs were detected was well LL3mw239. Drinking water MCLs<br />
have only been established <strong>for</strong> trichloroe<strong>the</strong>ne and toluene which were detected at one well<br />
location each at LL1mw085 and LL3mw239, respectively. Both concentrations detected were<br />
below <strong>the</strong>ir MCLs. Chloromethane was <strong>the</strong> most widespread VOC detected and was identified<br />
in various wells at all four load lines. Detected VOCs that exceeded <strong>the</strong> Region 9 PRGs included<br />
chloro<strong>for</strong>m at LL2mw267 and LL3mw239. The contaminant concentrations in samples were not<br />
attributable to lab contamination.<br />
3.2.8.2 Semi-Volatile Organic Compounds<br />
One SVOC contaminant exceeded <strong>the</strong> method detection limit. Bis(2ethylhexyl)phthalate was<br />
detected at a concentration of 6.51 micrograms per liter (µg/L) at well location LL1mw084. This<br />
compound exceeds <strong>the</strong> Region 9 PRG of 4.8 µg/L. There is no MCL standard <strong>for</strong> this<br />
compound.<br />
3.2.8.3 Explosives and Propellants<br />
Concentrations of explosives were detected in groundwater samples at four well locations above<br />
<strong>the</strong> method detection limits and included <strong>the</strong> following compounds at <strong>the</strong> identified well<br />
locations:<br />
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