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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 11cr Analyfiea 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 0 <br /> Gettler Ryan/Geostrategles Client Project ID Unocal 5421, 5421 <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804B19 -01 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC042098BTEXEXA GC042098STEXEXA GC042098BTEXEXA GC042098BTEXEXA GC042098BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 980484002 980484002 980484002 980484002 980484002 <br /> Sample Cone N D N D ND ND N D <br /> Prepared Date 4/20/98 4/20/98 4/20/98 4/20/98 4/20/98 <br /> Analyzed Date 4/20/98 4/20/98 4/20/98 4/20/98 4/20/98 <br /> Instrument 1 D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 021 019 020 062 13 <br /> MS % Recovery 105 95 100 103 108 <br /> Dup Result 020 019 020 059 12 <br /> MSD % Recov • 100 95 100 98 100 <br /> RPD 49 00 00 50 80 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS #: BLK042098 BLK042098 BLK042098 BLK042098 BLK042098 <br /> Prepared Date 4/20/98 4/20/98 4/20/98 4/20/98 4/20/98 <br /> Analyzed Date 4/20/98 4/20/98 4/20/98 4/20/98 4/20/98 <br /> Instrument I D.# GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 021 020 021 062 13 <br /> LCS % Recov .. 105 100 105 103 108 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 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 /> SEQUOIA 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 /> gory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Reiattve% Difference 9804819 GET ¢1> <br />