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Lancaster <br /> Laboratories Analysis Report <br /> 2425 New Holland Pike PO Box 12425 Lancaster,PA 17605-2425•717-656 2300 Fox 717-656-2681•www lancasterlabs comY1 <br /> Page 2 of 3 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 849858 <br /> Reported 05/08/03 at 01 37 PM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BRG DUP DUP DUP <br /> RPD <br /> Analysis Name $REC %REC Limits RPD MAX Conc Conc RPD Kax— <br /> t-Butyl alcohol 102 100 39-155 2 30 <br /> Benzene 105 103 83-128 2 30 <br /> Toluene 108 107 83-127 1 30 <br /> Ethylbenzene 111 110 82-134 1 30 <br /> Xylene (Total) 111 110 82-130 1 30 <br /> Surrogate Quality Control <br /> Analysis Name TPH-GRO - Waters <br /> Batch number 03119A56A <br /> Trifluorotoluene-F <br /> 4034565 96 <br /> 4034566 95 <br /> 4034567 159* <br /> 4034568 66 <br /> 4034569 97 <br /> 4034570 97 <br /> 4034571 96 <br /> 4034572 95 <br /> 4034573 91 <br /> 4034574 93 <br /> 4034575 96 <br /> Blank 101 <br /> LCS 103 <br /> LCSD 91 <br /> MS 100 <br /> Limits 57-146 <br /> Analysis Name BTEX + Oxygenates by 8260B <br /> Batch number P031201AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-de 4-Bromofluorobenzene <br /> 4034569 99 99 104 108 <br /> 4034570 101 103 104 110 <br /> 4034571 101 99 103 108 <br /> 4034572 101 101 103 110 <br /> 4034573 101 100 103 97 <br /> 4034574 101 99 103 111 <br /> 4034575 100 99 103 111 <br /> Blank 101 103 92 95 <br /> LCS 100 99 102 109 <br /> MS 101 102 102 112 <br /> MSD 102 99 104 111 <br /> Limits 81-120 82-112 B5-112 83-113 <br /> Analysis Name BTEX + Oxygenates by 8260B <br /> Batch number P032222AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-de 4-Bromofluorobenzene <br /> *- Outside of specification <br /> (1) 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 />