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7 <br /> IA� <br /> Addendum to Interim Corrective Action Plan <br /> Frontier Transportation, Inc. <br /> April 14, 2006 <br /> Page 11 <br /> • Project name and number; <br /> • Sample identification number; <br /> • Name and sample collector; <br /> [ 1 • Date and time of collection; <br /> f_ I • Analytical parameters ; <br /> • Known hazards ; <br /> �; ' • Pertinent comments . <br /> 6.0) CONCLUSIONS <br /> I] <br /> Recent identification of floating free product in MW-2 and MW-21 rule out use of <br /> ozone sparging/injection, which was arranged as a means of removing dissolved <br /> -� contamination from groundwater. Elevated contamination and presence of free product <br /> require that a more stringent method of corrective action be employed to effectively <br /> remove contamination and maintain containment. Therefore, the groundwater will be <br /> ---I treating using groundwater extraction and the soil in the source area will be excavated. <br /> I_I 7.0) RECOMMENDATIONS <br /> I' l As a result of the partitioning of free phase gasoline for the first time in <br /> groundwater monitoring performed since 1999, it is recommended that deployment of <br /> passive skimmers be initiated immediately. It is further recommended that excavation of <br /> the source area be completed after aquifer testing is done. BEA recommends that the <br /> subsurface groundwater contamination be removed via groundwater extraction. The <br /> appropriate system will be designed based upon the results of the aquifer tests performed <br /> at MW-8 and MW-9. <br /> i <br /> f <br /> J <br />