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Kennedy/Jenks/�Chiltan <br /> � Mr. Charles Whitworth <br /> i Cal-Farm Supply <br /> I4 July 1989 <br /> Page 10 <br /> Chlorinated Herbicides- Chlorinated herbicides were not detected in surface <br /> soil samples. However, the pesticide 2,4-D was detected in the two wipe <br /> samples collected from the floor of the warehouse building. Concentrations of <br /> 22 ug/100cm2 and 1 .7 ug/100cm2 were reported in samples WS-1 and WS-2 <br /> respectively. <br /> Oraananhosphorus Pesticides: The organophosphorus pesticides demeton-s, <br /> demeton-o, diazinon, d}sulforon, methyl parathion, malathion, ethyl parathion, <br /> ethion, and guthion were not detected in surface soil samples or surface wipe <br /> samples collected and analyzed during this investigation. <br /> t <br /> Carbamates and Urea Pesticides. Carbamates and urea pesticides were not <br /> detected in any of the surface soils or wipe samples. <br /> Dioxin. Analysis for the 2,3,7,8-TCDD (dioxin) isomer indicated that <br /> concentrations above the method detection limits were not present in either of <br /> the two surface soils (SS-11 and SS-12) and the two wipe samples analyzed. <br /> Detection limits for dioxin ranged from 0.022 ug/Kg to 0.047 ug/Kg for soils <br /> *• and 0.00018 ug/wipe to 0.00029 ug/wipe for wipe samples. <br /> FINDINGS <br /> The intent of the investigation was to determine whether a source area for <br /> nitrates and hydrocarbons previously detected in a groundwater reconnaissance <br /> sample collected at the site is present on the site, to determine the contents <br /> I of the storage trailers, and to determine if residual pesticides were present <br /> in soils throughout the yard or the warehouse building. The concentrations of <br /> nitrate detected in a previous investigation were not duplicated during the <br /> current investigation, nor was a source of nitrates determined in the soils. <br /> One groundwater sample was found to contain nitrate above drinking water <br /> standards, however, as explained below, the source of this nitrate appears to <br /> be offsite. The extensive suite of pesticide analyses conducted on soils and <br /> wipe samples indicated that the only pesticides detected at concentrations <br /> above potentially relevant criteria were 4,4'-DDT and Endosulfan I in soils. <br /> An underground storage tank which appears to have leaked was also identified <br /> i at the site. Two of the storage trailers were found to be empty, the other <br /> contained pesticides in their original containers. A detailed description of <br /> these findings follows <br /> I <br /> t <br /> 1 <br /> I <br /> i <br /> 1 <br /> r <br />