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KIM <br /> ON <br /> Coca-Cola Enterprises - West <br /> USTEC Job No.90054.03 <br /> Response: USTEC submitted the signed copies of the chain of custody documents to Mr.Steve <br /> Schneider of the San Joaquin County Public Health Services. <br /> Comment 2) Diesel has been found in both soil and groundwater as well as <br /> cyanide at 73 ppm in the outside stockpiled soil. The source of <br /> w- these two contaminates is unspecified at this point, Please provide <br /> a history of the site and of the 1,000-gallon UST as this might <br /> reveal the information that we are currently lacking. Additionally, <br /> j please re-sample the outside stockpile for cyanide to support or <br /> rebuke the previous sampling results. <br /> Response: TPH concentrations quantified against a diesel standard are reported by the <br /> laboratory as "high boiling point hydrocarbons" and usually referred to as diesel. However, <br /> i <br /> these concentrations may actually represent the heavier components of gasoline since there is <br /> an overlap in the chromatograms of hydrocarbons in the CB to C1z range. The verification <br /> samples collected from the diesel UST excavation were below analytical detection limits which <br /> suggests that the source of the contamination is probably not from the diesel UST excavation. <br /> The diesel concentrations that were initially found to be present in the soil and groundwater at <br /> ! -- the site have ah but disappeared since the initial investigation, <br /> A possible source of the diesel contamination may have been from the concrete company that <br /> 3 site. During the well completion activities,diesel was used <br /> completed t1�e wells at the Stockton <br /> f w, <br /> on the inside of the cement truck and in the delivery trough as a lubricant. Mr.Steve Schneider <br /> I of the Sari Joaquin Public Health Services and the USTEC hydrogeologist identified the problem <br /> during the drilling activities and made the concrete company stop using the diesel fuel. Diesel <br /> r constituents have not been detected in groundwater samples from the last three quarterly <br /> monitoring periods with the exception of groundwater monitoring well MW-2. <br /> i <br /> USTEC collected additional composite soil samples on March 7, 1991. The analytical chemistry <br /> test results for cyanide indicated a reactive cyanide concentration of 1.7 ppm. This concentration <br /> poses no significant problem and after discussion with Mr. Steve Schneider,no further action <br /> was recommended concerning the cyanide issue. The results of the sampling were reported in <br /> a letter to the San Joaquin Public Health Services dated April 4, 1991 (Appendix B). <br /> _ 7 <br />