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1 <br /> Kennedy/Jenks/Chilton <br /> Mr. Charles Whitworth <br /> Cal-Farm Supply <br /> 14 July 1989 <br /> Page 12 <br /> Underground Storage Tank <br /> 3 <br /> Petroleum hydrocarbons, presumably related to past fuel storage in an <br /> underground storage tank at the site (see Figure Xfor approximate tank <br /> E location) , are present in soils and groundwater collected from borings B-1 and <br /> j MW-1. The tank reportedly only stored diesel fuel . However, TPH as gasoline <br /> was detected in soils from boring B-1 and in groundwater collected from MW-1. <br /> M In addition, the constituents BXTE were detected in the groundwater sample <br /> collected from MW-1 . This indicates that there is a possibility that gasoline <br /> was previously stored 7n the tank and may have leaked at some time in the <br /> .• past. <br /> According to a leaching potential analysis (see Attachment G), 10 ppm gasoline <br /> and 100 ppm diesel could theoretically be left in soils at the site without <br /> impacting groundwater. Only one subsurface sample analyzed contained <br /> hydrocarbons above this level . <br /> The groundwater gradient measured between MW-1 and MW-3 was 0.0013. Drilling <br /> logs (see Attachment B) indicate that the site is underlain by a firm, lean <br /> clay. Site lithology combined with the gradual groundwater gradient may serve <br /> to retard movement of petroleum products which might have leaked from the <br /> tank. <br /> Storage Trailers <br /> Pesticides currently stored in the storage trailers along the southern <br /> boundary of the site do not appear to have affected surface soils in the <br /> ^1 maintenance yard. The visual inspection of the trailers revealed three <br /> , } leaking five-gallon containers of Alfa-Tox. The active compounds in Alfa-Tox <br /> are reported to be diazinon and methoxychlor. Diazinon (an organophosphorus <br /> pesticide) was not detected in any of the soil or wipe samples. Methoxychlor <br /> was detected in surface soils in the yard, however, concentrations were below <br /> the TTLC value. <br /> We have identified an agricultural supply company that may accept the Ordram <br /> 8-E and possibly the Silvisar for future distribution. Containers of the <br /> pesticide Ordram (a carbamate) stored in the trailers at the site do not <br /> appear to pose a threat to soils at the facility as the containers appear to <br /> be intact. In addition, carbamates were not detected in soils at the site <br /> indicating extensive leakage has not occurred <br /> RECOMMENDATIONS <br /> Our findings indicate that three areas of concern are present at the site. <br /> These include: the underground storage tank, soils containing concentrations <br /> of 4,4'-DDT exceeding the TTLC in several source areas, and the pesticides <br /> I <br />