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No Further Action Request Section 7 0 <br /> Former American Forest Products Facility 2/16/2006 <br /> URS Project No 17322736 Page 7-1 <br /> 70 CONCLUSIONS AND RECOMMENDATIONS <br /> This report constitutes a request for no further action for this site Data presented herein demonstrate that <br /> NFA requirements are met as contained in Appendix A of Tri-Regional Board Staff Recommendations for <br /> Preliminary Investigations and Evaluation of Underground Tank Sites (RWQCB-Central Valley Region, <br /> 2004) <br /> 7.1 CONCLUSIONS <br /> • Based on two rounds of downgradient groundwater assessment conducted during 2005, a / <br /> downgradient zero or non-detect line has been established for 1,2-DCA V <br /> • No water supply wells are located within 2,000 feet downgradient of the site, based on a ✓P� <br /> recently updated well survey <br /> • When corrected for outliers, all wells in which 1,2-DCA has been reported show a declining �'Ja <br /> trend in the concentration of that constituent )Z_ -'� t3 <br /> • A Tier 1 environmental risk assessment conducted based on conservative RWQCB k <br /> Environmental Screening Levels indicates no indoor air risk due to the presence of <br /> groundwater contaminants at maximum 2005 concentrations " <br /> • A comparison of site characteristics to RWQCB requirements indicates that the site qualifies <br /> for consideration for no further action <br /> 7.2 RECOMMENDATIONS <br /> URS respectfully requests that this site be considered for a letter of no further action <br /> E 1'ProjectslURS\AFP0005 DCA InvestigalionliiP Investigation ReportlArP 2005 Report WP-TE Re,602 doe <br />