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. Project Number: SFB 175-0204.72 <br /> Consultant Project Number: 203-175-3291 <br /> Contract Number: N46CWCO244-9-X <br /> Facility Number: 9-0557 <br /> Work Order Number: D004127 <br /> Report issue Date: April 10,1990 <br /> Table 5 <br /> MATRIX SPIKE (MS) AND MATRIX SPIKE DUPLICATE (MSD) RECOVERY <br /> AND RELATIVE PERCENT DIFFERENCE (RPD) REPORT <br /> Purgeable Aromatics in Soil <br /> MODIFIED EPA METHOD 8020 <br /> Date of Analysis: 04/07/90 <br /> Sample Used: D004126-06 Units: mg/Kg <br /> Sample Concentratio MS MS, % MSD MSD, % <br /> Analyte Result n Added Result Recovery Result Recovery <br /> Benzene <0.005 2.85 2.24 79 2.24 79 <br /> Toluene <0.005 2.85 2.52 88 2.45 86 <br /> Ethylbenzene <0.005 2.85 2.49 87 2.22 78 <br /> Xylene total <0.015 8.67 7.01 82 6.70 78 <br /> Acceptability Umitsl <br /> Analyte RPD, % Maximum RPD, % % Recovery <br /> Benzene 0 30 50 -112 <br /> Toluene 2 30 50 -108 <br /> Ethylbenzene 11 30 50- 113 <br /> Xylene (total) 5 30 50 - 114 <br /> <# = Not Detected at the indicated detection limit <br /> 1 = Acceptability limits are derived from the 99% confidence interval of all samples during the pre- <br /> vious quarter. <br /> G7E1_Concord,CA Page 6 016 <br /> • D004127.DOC NGTEL <br /> E N VI R O N M f N T A L <br /> LAEORATORIrS. INC <br />