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Project Number: SFO-17540204,72 <br /> Consultant Project Number: 1tiOM250"0t4 <br /> Contract Number: N«CWCO244-9-X <br /> Facility Number: $.6155 <br /> Work Ortler Number: COD-O&M7 <br /> Report Issue Date: September 20,1990 <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 8020/8015 <br /> Date of Analysis: 09/17/90 <br /> Sample Used: C009371-01 Units: mg/Kg <br /> Sample Concentration MS, % MSD MSD, <br /> Analyte Result Added MS Result Recovery Result Recovery <br /> Benzene ND 2.85 2.27 79 2.34 82 <br /> ,.: Toluene NO 2.86 2.07 72 2.13 74 <br /> Ethylbenzene NA 2.86 2.11 74 2.17 76 <br /> F X ene(total) ND 8.58 6.38 74 6,54 75 <br /> Acceptability Umitsl <br /> Analyte RPD,% Maximum RPD,°jo %Recovery <br /> Benzene 41 30 50-112 <br /> Toluene 3 30 50-108 <br /> Ethyfbenzene 3 30 50-113 <br /> X ene(total) 1 30 50-114 <br /> <# Not Detected at the indicated detection limit <br /> 1 Acceptability limits are derived From the 991k confidence interval of all samples during the <br /> previous quarter. <br /> . .......... . ............... <br /> GT_!.Concord,CA Paye 7 of 7 <br /> C009287.DOC <br /> TL <br /> F N V I 0 0 N Vl N T A L - <br /> tniOQA1OP11S I+rC - _ <br />