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%%MOO <br /> 83 WEST MARCH LANE <br /> SUITE 12 <br /> STOCKTON,GA 95207 <br /> sM PHONE:(209)476-1635 <br /> qm"Ciffs DE5IGNERSlCAT151ATANTS <br /> February 15, 1990 <br /> Mr. Greg Lyon <br /> San Joaquin County Public Health Services FEB 1990 <br /> Environmental Health Division <br /> P.O. Box 2009 -%JVR0NMF%AL H(_A°Y' <br /> 1601 East Hazelton Ave. <br /> Stockton, CA 95201 <br /> Dear Mr. Lyon, <br /> Please find enclosed the analytical results for the reanalyses of <br /> three of the samples collected from the recently installed borehole <br /> at the Laura Scudder' s Tracy plant located at 100 W. Valpico Road <br /> in Tracy, California. <br /> The three samples which were reanalyzed were the two soil samples, <br /> 30-31. 5 A, B and 35-36. 5 A,B and the single water sample T-1. <br /> As can be seen by reviewing these data, method blank contamination <br /> continued to plaque these analyses. Even so, the Total Petroleum <br /> Hydrocarbon (TPH) concentrations within both soil samples were <br /> below the detection limit. <br /> The third rerun of the water sample was also plaqued by this method <br /> blank contamination. Based on the third rerun TPH concentration of <br /> 0. 52 mg/L, our laboratory decided to re-initiate the process from <br /> the beginning with the remaining water from the original sample. <br /> Prior to this time, the original sample extract was being used for <br /> the analyses. This decision was based on the possibility of <br /> extract contamination. This re-extracted, reanalyzed sample <br /> indicated a lack of TPH compounds as did the analytical method <br /> blank. <br /> The additional analyses were conducted so that we may be able to <br /> provide you with data in which we have the utmost confidence. As <br /> was explained in our January 31, 1990, "Soil Remedial Proposal, " we <br /> felt that the trace compounds detected within the subject samples <br /> was due to laboratory cross contamination and was not representa- <br /> tive of the actual site conditions. This presumption was supported <br /> by the trace compounds continually detected within the analytical <br /> method blanks. <br />