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J. H. KLEINFELDER & ASSOCIATES <br /> File No. W-2030-1 <br /> September 25 , 1986 <br /> Page 8 <br /> advancing the boring to a point immediately above the <br /> sampling depth and then driving a Modified California <br /> Sampler lined with three brass tubes into the undisturbed <br /> soil . The sampler was removed from the bottom of the <br /> boring, and the bottom (third) tube was sealed with aluminum <br /> foil and tight-fitting plastic cans. The sealed tube was <br /> then immediately stored in an iced cooler . The samples were <br /> delivered to California Analytical Laboratories, Inc. , <br /> located in West Sacramento, under chain-of-custody. A <br /> completed copy of the chain-of-custody form is included in <br /> the appendix of this report . <br /> To minimize the possibility of cross contamination, all <br /> augers and associated equipment were steam-cleaned prior to <br /> the drilling of each borehole. The sampler was cleaned in a <br /> trisodium phosphate rinse, and a distilled water rinse <br /> before collecting subsequent samples. <br /> V. ANALYTICAL RESULTS <br /> A soil sample, collected from the termination depth of each <br /> boring was submitted to the contract laboratory for aromatic <br /> hydrocarbon and carbamate and organophosphorous pesticides <br /> analyses. These three chemical groups were selected for analyses <br /> to serve as indicators of potential leakage from the rinsewater <br /> _ tank. <br /> The two pesticide groups were selected from a list of <br /> compounds Union Carbide reportedly discharged to the tank. These <br /> represent the major pesticide groups from the list and combined <br /> with the aromatic hydrocarbons ( typical pesticide carriers) <br /> should provide the best indicators of potential leakage. <br /> The analytical results of these two samples: CAL ID # <br /> 25841-1 (B-1 ) and # 25841-2 (B-2 ) , are contained in the appendix <br /> of this report . The analytical data sheets also list the various <br /> pesticides and aromatic hydrocarbons detectable by the three <br /> scans employed by California Analytical Laboratories, Inc . <br /> As shown on the data sheets, the samples did not contain <br /> detectable levels of the two pesticide groups and aromatic <br /> hydrocarbons. <br />