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*AliLancasterAnal sis Re ort <br /> Laboratories Y p <br /> 2425 New Holland Pike PO Bon 12425 Lancaster PA 17605 2425•717 656 2300 Fax 717-656 2681 www lancasterlabs Com <br /> Page 1 of 2 <br /> Quality Control Summary <br /> Client Name ChevronTexace Group Number 894339 <br /> Reported 05/10/04 at 11 42 PM <br /> Matrix QC may not be reported if site-specific QC samples were not <br /> submitted In these situations,to demonstrate precision and accuracy at <br /> a batch level,a LCS/LCSD was performed,unless otherwise specified in the <br /> method <br /> Laboratory Compliance Quality Control <br /> Blank Blank Report LCS LCSD LCS/LCSD <br /> Analysis Name Result MDL Units %REC %REC Limits RPD RPD Max <br /> Batch number 04125A07A Sample number(s) 4265387-4265390 <br /> TPH-GRO - Waters N D 50 ug/l 95 93 70-130 1 30 <br /> Batch umber P041272AA Sample number(s) 4265387-4265390 <br /> Methyl Tertiary Butyl Ether N D 2 ug/1 100 77-127 <br /> n <br /> Benzene N D 5 ug/1 100 85-117 <br /> Toluene N D 5 ug/l 96 85-115 <br /> Eth lbenzene N D 5 ug/l 96 82-119 <br /> 0Xylene (Total) N D 5 ug/l 99 84-120 <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BRG DUP DUP Dup RPD <br /> Analysis Name %REC %REC Limits RPD MAX Cone Conc RPD Max <br /> Batch number 0412SA07A Sample rnumber(s) 4265387-4265390 <br /> TPH-GRO - Waters 99 63-154 <br /> Batch number P041272AA Sample number(s) 4265387-4265390 <br /> Methyl Tertiary Butyl Ether 94 87 69-134 7 30 <br /> Benzene 93 87 83-12B 6 30 <br /> Toluene 89 84 83-127 6 30 <br /> Ethylbenzene 90 84 82-129 7 30 <br /> Xylene {Total) 91 85 82-130 7 30 <br /> Surrogate Quality Control <br /> Analysis Name TPH-GRO - Waters <br /> Batch number 04125A07A <br /> Trzfluorotoluene-F <br /> 4265387 87 <br /> 4265388 89 <br /> 4265389 89 <br /> 4265390 88 <br /> Blank 87 <br /> LCS 109 <br /> LCSD 109 <br /> MS 109 <br /> *-Outside of specification <br /> (I) The result for one or both determinations was less than five times the LOQ <br /> (2) The background result was more than four times the spike added <br />