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44 Lancaster Analysis f sis Re ort <br /> Laboratories Y <br /> 2425 New Hokand Pike PO Box 12425 Lenaasier PA 17605.2425•717 656 2300 Fax 717 656.2681 www lancaslerlabs Com <br /> Page I of 3 <br /> Quality Control Summary <br /> Client Name Chevron Group Number 976100 <br /> Reported 02/09/06 at 09 52 AM <br /> Matrix QC may not be reported if site-specific QC samples were not <br /> submittea 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 %RE %RBC Limits RPD Max <br /> Batch number 060300003A Sample numbers) 4698464-4698467 <br /> TPH-DRO CALUFV Waters) N D 50 ug/1 84 65 59-131 1 20 <br /> Batch number 06031A16A Sample number(s) 4698463-4698467 <br /> TPH-GRO - waters N D 50 ug/l 111 97 70-130 14 30 <br /> Batch number Z060362AA Sample number(s) 4698463-4698466 73-119 <br /> Methyl Tertiary Butyl Ether N D 0 5 u9/1 ill 85-117 <br /> Benzene N D D 5 ug/l 101 <br /> Toluene N D 0 5 ug/l 103 85-115 <br /> hylbenzene N D 0 5 ug/1 106 62-119 <br /> Dene (Total) N D 0 5 u9/1 106 83-113 <br /> Batch number Z060372AA Sample number(s) 4698467 73-119 <br /> Methyl Tertiary Butyl Ether N D 0 5 ug/l 111 85-117 <br /> Benzene N D 0 5 ug/l 101 <br /> Toluene N D 0 5 ug/1 107 85-115 <br /> Ethylbenzene N D 0 5 ug/1 107 82 119 <br /> Xylene (Total) N D 0 5 ug/1 109 83-113 <br /> Sample Matrix Quality Control <br /> unspiked (UNSPK) = the sample used in conjunction with the matrix spike <br /> Background (BKG) = the sample used in con3unction with the duplicate <br /> MS MSD MS/MSD RPD BKG DUP DUP DUP RPD <br /> A_nalyals Name $R8C %REC LimitS RPD MAX Conc Cone RPD Max <br /> Batch number 0603JA16A Sample number(s63-1548463-4696467 UNSPK P698446 <br /> TPH-GRO - Waters 111 <br /> Batch number Z060362AA Sample numbers) 4698463-4698466 UNSPK 4698465 <br /> Methyl Tertiary Butyl Ether 113 112 69-12'7 3 30 <br /> Benzene 110 111 83-128 1 30 <br /> Toluene 114 114 63-127 0 30 <br /> Ethylbenzene 114 116 62-129 2 30 <br /> Xylene (Total) 114 116 82-130 2 30 <br /> Batch number Z060372AA Sample number(s) 4698467 UNSPK P698480 <br /> Methyl Tertiary Butyl Ether 115 117 69-127 1 30 <br /> Benzene 111 111 e3-128 0 30 <br /> Toluene 115 116 83-127 1 30 <br /> Ethylbenzene 117 128 62-129 1 3D <br /> Xylene (Total) 118 117 82-130 0 30 <br /> "-Outside of specification <br /> 40I) The result for one or both determinations was less than flue Mmes the LOQ <br /> 2) The background result was more than four times the spike added <br />