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`WQ `° �'� <br /> • OCT 10 19• <br /> Kennedy/Jenks/Chilton <br /> ENVIRONMENTAL HEALTH <br /> Attachment A to Kennedy/Jenks/Chilton's PERMITISERVICES <br /> letter to Mr. Ron Valinoti <br /> dated 13 October 1989 <br /> Cal -Farm Supply, Stockton Facility <br /> 2040 W. Washington Street <br /> Stockton, CA <br /> Site Closure Work Plan <br /> BACKGROUND <br /> The results of a preliminary site investigation performed at the former <br /> Cal -Farm Supply facility located at 2040 West Washington Street in <br /> Stockton, California are summarized in Kennedy/Jenks/Chilton's report <br /> entitled Preliminary Site Investigation Report, Cal -Farm Supply Stockton <br /> Facility, dated 14 July 1989. Laboratory analyses of soils and <br /> groundwater collected from soil borings in the vicinity of an underground <br /> fuel storage tank located at the site indicated that total petroleum <br /> hydrocarbons (TPH) and benzene, xylenes, toluene and ethylbenzene (BXTE) <br /> are present in soils and groundwater in the vicinity of the tank. <br /> However, the lateral extent of these chemicals in groundwater was not <br /> determined in a downgradient direction. <br /> Analyses conducted on surface soils collected inside the fenced storage <br /> yard at the site indicated the presence of two localized areas of <br /> elevated DDT concentrations in the storage yard. Concentrations of DDT <br /> above the Total Threshold Limit Concentration (TTLC) of 1,000 ug/Kg were <br /> found in four discrete soil samples collected in the two areas during the <br /> preliminary site investigation. One of the areas containing elevated DDT <br /> concentrations is adjacent to the southern fenced boundary. The extent <br /> of DDT south of this area was not determined during the preliminary <br /> investigation. The concentration of the two samples collected in this <br /> area were 3,900 and 190,000 ug/Kg. The second area is near the eastern <br /> access door of the warehouse and concentrations of DDT in the two samples <br /> collected in this area were 1,400 and 2,900 ug/Kg. <br /> The contents of three storage trailers located along the southern <br /> boundary of the storage yard were examined during the preliminary <br /> investigation. Two of the trailers were found to be empty and no visible <br /> staining on the floor or walls of the trailers were noted during <br /> inspection. The third trailer contains five 5-gallon containers of <br /> Ordram 8-E, eight or nine 5-gallon containers of Silvisar 550, and three <br /> corroded and possibly leaking containers of Alfa-Tox. The Alfa-Tox <br /> appeared to have leaked onto the floor of the storage trailers. Initial <br /> contacts with a local pesticide distributor indicated that the <br /> WPNMLI:STOCKTON.WP2 A - 1 <br />