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Prolect Number: SFB•175-0204.72 <br /> Consultant Project Number: 203.175-3241 <br /> Corrtroct Number: N46CW00244-9-X <br /> Facility Number: 9-0557 <br /> Work Order Number: D005259 <br /> Report issue Date: May 21,19W <br /> Table 5 <br /> MATRIX SPIKE (MS) AND MATRIX SPIKE DUPLICATE (MSD) RECOVERY <br /> AND RELATIVE PERCENT DIFFERENCE (RPD) REPORT <br /> Purgeable Aromatics and Total Petroleum Hydrocarbons <br /> as Gasoline in Soil <br /> EPA Method 8020/6015 <br /> Date of Analysis: 05/15/90 <br /> Sample Used: D005292-01 Units: mg/Kg <br /> Sample Concentratio MS, % MSD, % <br /> Analyte Result n Added MS Result Recovery MSD Recovery <br /> Result <br /> Benzene <0.005 2.86 2.69 94 2.68 94 <br /> iToluene <0.005 2.86 2.68 93 2.67 93 <br /> Ethylbenzene <0.005 2.86 2.63 92 2.61 91 <br /> Xylene (total) <0.015 8.58 7.93 92 7.9 92 <br /> Acceptability Limits' <br /> Analyte RPD, % Maximum RPD, % % Recovery <br /> Benzene 0 30 50 - 112 <br /> Toluene 0 30 50 - 108 <br /> PXE,thylbenzene 1 30 50- 113 <br /> lene (total) 0 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 previous <br /> quarter. <br /> GTEL Concord,CA Page 7 of 7 <br /> • D005259.DOC <br /> MGTEL <br /> E N V I R O N M E N T A L <br /> LA0ORAt0RM. IMC. <br />