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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 fd Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 'Blaine Tech Services, Inc Client Project ID Chevron 9-1918/970207-H1 <br /> ,1680 Rogers Avenue Matra Liquid n <br /> San Jose,CA 95112 <br /> Attention Fran Thie Work Order# 9702482-06-08 Reported Feb 20, 1997, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21397BTEX07A GCO21397BTEX07A GCO21397BTEX07A GCO21397BTEX07A <br /> Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method- EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A.Porter A.Porter A Porter X Porter <br /> M S/MSD# 970248201 970248201 970248201 970248201 <br /> Sample Conc N D N D N D N D <br /> Prepared Date. 2/13/97 2/13/97 2/13/97 2/13/97 <br /> Analyzed Date: 2/13/97 2/13/97 2/13/97 2/13/97 <br /> Instrument I D #: GCHP07 GCHP07 GCHP07 GCHP07 <br /> Conc Spiked: 10pg/L 10pg/L 10ug/L 30lrg/L <br /> Result 92 9 7 10 31 <br /> 10 MS % Recovery- 92 97 100 103 <br /> Dup Result- 92 97 10 31 <br /> MSD %Recov ' 92 97 100 103 <br /> RPD. 00 00 0 0 00 <br /> RPD Limit 0-25 0-25 0.25 0-25 <br /> LCS#: BLK021397 BLK021397 BLK021397 BLK021397 <br /> Prepared Date: 2/13/97 2/13/97 2/13/97 2/13/97 <br /> Analyzed Date. 2/13/97 2/13/97 2/13/97 2/13/97 <br /> Instrument I D.#' GCHP07 GCHP07 GCHP07 GCHP07 <br /> Conc Spiked 10pg/L 10pg/L 10ug/L 30pg/L <br /> LCS Result. 91 9 4 10 30 <br /> LCS %Recov . 91 94 100 100 <br /> 60-140 60-140 60.140 60-140 <br /> LCS 70-130 70.130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> IA NALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> eg Pe ner <br /> P ct Ma r **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9702482 BLA <2> <br />