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ICES 6.0 INVESTIGATION RESULTS The laboratory analytical results are presented below and summarized in Tables 1 and 2 . Laboratory certificates are included in Appendix A. 6. 1 Laboratory Analytical Results Results of the supplementary sampling activities indicated that organochlorine pesticides, lead, and mercury were below their respective residential ESLs . Five soil samples (K6, K7, K8, K10, and K24) had higher detection limits due to matrix interference which was most likely caused by a higher organic content in the surficial sediments . The only detectable organochlorine pesticide was DDE . DDE was reported at a concentration of 0 . 036 mg/kg in one soil sample (K8) . This concentration was substantially below the residential ESL of 1 . 8 mg/kg. Arsenic concentrations ranging from 1 . 3 mg/kg to 2 . 4 mg/kg were above the residential ESL of 0 . 067 mg/kg and within typical arsenic background levels of up to 11 mg/kg. Contaminant concentrations that are within background levels are considered acceptable by regulatory agencies where their background levels exceed the corresponding ESL. Lead concentrations ranging from 3 . 8 mg/kg to 7 . 1 mg/kg and mercury levels of less than 0 . 050 mg/kg (not detected) were below their respective residential ESLs of 82 mg/kg and 13 mg/kg. 7 .0 DISCUSSION The results of this supplementary site investigation were generally consistent with the results of the initial preliminary site investigation. A total of thirty soil samples have been collected to date. We feel that the results of the thirty soil samples were more than adequate to fully characterize the surficial sediments at the Site based on our experience with similar agricultural properties especially where pesticides were applied uniformly throughout the entire Site . Based on the findings of the preliminary and supplementary site investigations, it appears that the soil within the entire Site had not been impacted by agricultural activities that were 3