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McDowell&Davis Towing <br /> 3 � Geo robe Soil Boring&Revised Risk <br /> ' <br /> Assessment and Conceptual Site Model Report <br /> Page; 8 <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> The soil and groundwater contamination at the McDowell and Davis underground storage <br /> tank site has been evaluated through an ASTM — Risk Based Corrective Action model. <br /> Groundwater impacts at the site do not pose a risk to offsite ingestion at the closest <br /> (� identified water approximately 750 feet from the site. Onsite groundwater impacts were <br /> below water quality goals in the May and August 2003 monitoring events. <br /> Individual and cumulative effect of contaminant concentrations through indoor air <br /> exposure does not pose a greater than acceptable cancer and toxicant risk. Additional <br /> remediation of the contamination does not appear warranted at this time. <br /> Groundwater monitoring should continue through the November 2003 event to provide <br /> two years of groundwater data. A closure request should be submitted for regulatory <br /> consideration with the report of the November 2003 groundwater monitoring event if <br /> there are no significant groundwater changes. 1 <br /> L <br />