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2K:\v <br /> RTC <br /> A S S Q C I A T E S I N C <br /> 5 0 CONCLUSIONS AND RECOMMENDATIONS <br /> The concentrations of CrVI detected in the soil samples collected from beneath the chiller unit <br /> are low and are comparable to the concentrations detected in the soil samples collected from <br /> beyond the known extent of CrVI impacted soil It is possible that previously impacted soil <br /> beneath the chiller unit has been flushed over time by chiller water leaching into the subsurface, <br />' resulting in low concentrations of CrVI <br /> Due to the production of elevated manganese concentrations, we recommend bench scale testing <br />' of zero valance nano-scale iron This material has been shown to reduce CiVI to Crlli and may <br /> have less propensity to produce high manganese concentrations as a secondary affect to <br /> groundwater Bench scale testing of zero valance nano-scale iron can be conducted in a similar <br /> manner as described in the report included in Appendix B <br /> 1 <br /> slenvironmentallb25831ri.portslhtncii test rpt do+. 8 <br />