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4 1 Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9333 <br /> 404 N W�get Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> � Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 16) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 <br /> 6280 Stoneridge Mall Rd , 8211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order # 9511587 -01-17 Reported Nov 16, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC11109513TEXEXA GC111095BTEXEXA GC111095BTEXEXA GC1110958TEXEXAA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jima D Jirsa D Jirsa 0 Jirsa <br /> M S/MSD # 951165204 951 165204 951165204 951165204 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 11/10/95 11/10/95 11/10/95 11/10/95 <br /> Analyzed Date 11/10/95 11/10/95 11/10/95 11/10/95 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 017 017 017 052 <br /> MS % Recovery 85 85 85 87 <br /> Dup Result 015 015 015 047 <br /> MSD % Recov 75 75 75 78 <br /> RPD 13 13 13 10 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # BLK111095 BLK111095 BILK 111095 BLK111095 <br /> Prepared Date 11/10/95 11/10/95 11/10/95 11/10/95 <br /> Analyzed Date 11/10/95 11/10/95 11/10/95 11/10/95 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 020 020 019 059 <br /> LCS % Recov 100 100 95 98 <br /> MS7MSD <br /> LCS <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> SE OIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is 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 /> Mark Cargasacchl <br /> Project Manager MS=Matrix Spike, MSD=MS Duplicate FIPD=Relative%Difference 9511587 TTT s 1 n <br />