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Morita Brothers 8 May 6, 1992 <br /> The middle sample sleeve was immediately sealed with Teflon@ film, capped, and <br /> ' placed on ice for transport to a California Department of Health Services (DOHS) <br /> certified laboratory The temperature within the ice chest will be recorded at each <br /> sampling interval and recorded on the chain of custody document Strict chain-of- <br /> custody procedures were utilized for all samples collected to ensure sample integrity <br /> and to document sample possession from the time of collection to the final <br /> destination The temperature within the ice chest was recorded at the time that the <br /> ' ice chest is delivered to the laboratory and recorded on the chain of custody <br /> document <br /> ' Sampling equipment was washed with TSP (tri-sodium phosphate) cleanser, and <br /> rinsed with tap water and de-ionized water prior to sampling, between sample <br /> intervals, and between borings to minimize the potential of cross contamination <br /> The augers were steam cleaned prior to drilling and between borings to minimize the <br /> potential of cross contamination The borings were backfilled with a cement- <br /> bentonite slurry <br /> ' 22 Laboratory Analysis <br /> Thirty soil samples were sent to Beckman Environmental Laboratory, of Porterville, <br />' California, a state-certified laboratory for chemical analysis The soil samples were <br /> analyzed for total purgeable hydrocarbons (TPH) as gasoline with a minimum <br />' detection limit of 05 mg/kg, and the fuel constituent volatile aromatics benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX) with a minimum detection limit of <br />' 0 005 mg/kg using USEPA Test Method 5030/GCFID, and USEPA Test Method 5030/8020, <br /> respectively Two soil sample which field screened as having the greatest <br /> concentrations of gasoline hydrocarbons from both borings TH-1 and TH-2 were <br /> submitted for analysis for the presence of total lead with a minimum detection limit <br /> of 0 025 mg/kg by the USEPA Test Method 7420 Because theses results of this analysis <br />' exceeded 13 mg/kg, these four samples were also analyzed for soluble lead with a <br /> minimum detection limit of ) 5 mg/kg by SW 6010 <br />' EB-8101-2 9204-EO44 KPT <br /> L _ <br />