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f ■ ` Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> �f 404 N Wiget lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> -VeoStrategles Inc Client Project Ib Unocal #0187 V Y r v <br /> 3035 Prospect Park Dr, Suite 80 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Stephen J Carter OC Sample Group 5071519-1522 Reported Aug 10, 1995,,3 <br /> r '� <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman K Barta <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br /> LCS Batch# LCS080895 LCS080895 LCS080895 LCSOBOB95 LC8080495 <br /> Date Prepared 8/8/95 8/8/95 8/8/95 8/8/95 8/4/95 <br /> Date Analyzed* 8/8/95 8/8/95 8/8/95 8/8/95 8/8/95 <br /> Instrument I D #- GCHP-1 GCHP-1 GCHP-1 GCHP-1 P-40 <br /> LC <br /> • S <br /> Recovery 96 98 97 97 92 <br /> Control Limits 75-125 75-125 75-125 75-125 80-120 <br /> r 'r •v{ ♦ r u n r y r n r v r v v rr v r 4 r , r � <br /> MS/MSD <br /> Batch# 5071520 5071520 5071520 5071520 5071512 <br /> Date Prepared 8/8/95 8/8/95 8/8/95 8/8/95 8/4/95 <br /> Date Analyzed 8/8/95 8/8/95 8/8/95 8/8/95 8/8/95 <br /> Instrument 1.13 #• GCHP-1 GCHP-1 GCHP-1 GCHP-1 P-40 <br /> Matrix Spike <br /> % Recovery 93 96 95 95 87 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 95 96 96 96 88 <br /> Relative % <br /> Difference 21 00 10 10 11 <br /> SEQUOIA ANALYTICAL Please Note <br /> 1 The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the CC limits for MS/MSD's are advisory only <br /> Janet H an and are not used to accept or reject batch results <br /> Project Manager <br /> 5071519 GSI <3> <br />