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Cmt.# Page # Line # New Page or Sheet Comment Shaw Environmental, Inc. 19 of 39 Recommendation Response screening levels. A summary of analytical results for the Shaw baseline groundwater sampling event are presented in the data summary tables (Table B-1) in Appendix B. The Kemron laboratory report and associated evaluation report for groundwater are presented in Appendix C in the electronic attachment. 3.2.8.1 Volatile Organic Compounds Low level concentrations of VOCs were detected in groundwater samples above the method detection limits at all four load lines and included the following compounds at the identified well locations: • Chloromethane – LL1mw078 (0.935 µg/L J), LL1mw081 (0.514 µg/L), LL1mw082 (0.378 µg/L J), LL1mw084 (0.559 µg/L J), LL1mw084 (0.342 µg/L J), LL2mw262 (0.413 µg/L J and 0.324 µg/L J), LL2mw263 (0.567 µg/L J), LL3mw236 (0.561 µg/L J), LL3mw238 (0.430 µg/L J), LL3mw239 (0.317 µg/L J), LL4mw197 (0.307 µg/L J) and LL4mw198 (0.333 µg/L J). • Acetone – LL1mw082 (3.28 µg/L), LL3mw239 (17.7 µg/L) • Trichloroethene –
Cmt.# Page # Line # New Page or Sheet Comment Shaw Environmental, Inc. 20 of 39 Recommendation Response LL1mw085 (0.259 µg/L J) • Chloroform – LL2mw267 (0.366 µg/L J) and LL3mw239 (0.335 µg/L J) • Carbon Disulfide – LL3mw239 (0.557 µg/L J) • 2-Butanone – LL3mw239 (4.1 µg/L J) • Toluene - LL3mw-239 (0.316 µg/L J) The location where the most VOCs were detected was well LL3mw239. Drinking water MCLs have only been established for trichloroethene and toluene which were detected at one well location each at LL1mw085 and LL3mw239, respectively. Both concentrations detected were below their MCLs. Chloromethane was the most widespread VOC detected and was identified in various wells at all four load lines. Detected VOCs that exceeded the Region 9 PRGs included chloroform at LL2mw267 and LL3mw239. 3.2.8.2 Semi-Volatile Organic Compounds One SVOC contaminant exceeded the method detection limit. Bis(2ethylhexyl)phthalate was detected at a concentration of 6.51 micrograms per liter (µg/L) at well location LL1mw084. This compound exceeds the Region 9
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