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Sequoia 680 Chesapeake Dnvc Rcd�ood CityCA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane \Valnut Creek CA 94598 (510) 988 9600 FAX(5 10) 988 9673 <br /> Analytical 819 Striker Avenue Suite 9 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 O100 <br /> EA Engineering Client Project ID Exxon = RS 3942 Stockton, CA <br /> 3841 N Freeway Blvd , #145 Matrix Soil <br /> Sacramento, CA 95834 - <br /> Attentlon Kynacos Kynacou OC Sample Group 7020617-18 Reported Feb 27, 1997 <br /> 1 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br />' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Lee C Lee C Lee C Lee <br /> Concentration <br />' Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg kg 0 60 mg/kg <br /> LCS Batch# LCS022597 LCS022597 1-CS022597 LCS022597 <br />' Date Prepared 02/25/97 02/25/97 02/25197 02/25/97 <br /> Date Analyzed 02/25/97 02/25/97 02/2597 02/25/97 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 <br /> LCS <br /> Recovery 84 88 94 93 <br />' Control Limits 70-130 70-130 70-130 70-130 <br />' MS/MSD <br /> Batch # 7020618 7020618 7020618 7020618 <br />' Date Prepared 02/25/97 02/25/97 02/25,97 02/25/97 <br /> Date Analyzed 02/25/97 02/25/97 02/25/97 02/25/97 <br /> Instrument l D # GCHP t GCHP 1 GCHP-1 GCHP 1 <br /> Matrix Spike <br /> % Recovery 85 92 100 100 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 86 92 99 98 <br />' Relative % <br /> Difference 1 2 00 1 0 2 0 <br /> ISEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> A M �t-5c+44EW— preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> 'Edana M Belschner I and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 7020617 EAE <2> <br />