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Sequoia 680 Chesapeake Dnve 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 /> 819 Striker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Analytical <br /> OMPDS Services Client Project ID Unocal#0187 437 E Miner Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7110119-127 Reported Nov 18, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC110797 GC110797 GC 110797 GC110797 <br /> 802004A 802004A 802004A 802004A <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 Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 7101939 7101939 7101939 7101939 <br /> Sample Conc N D N D N D ND <br /> Prepared Date 11/7/97 11/7/97 11/7/97 11/7/97 <br /> Analyzed Date 11/7/97 11/7/97 11/7/97 11/7/97 <br /> Instrument I D # HP-4 HP-4 HP 4 HP-4 <br /> Conc Spiked 20pg/L 20ug/L 20pg/L 60ug/L <br /> Result 19 19 18 58 <br /> MS % Recovery 95 95 90 97 <br /> Dup Result 18 18 18 56 <br /> • MSD % Recov 90 90 90 93 <br /> RPD 54 54 000 35 <br /> RPI] Limit 0-20 0-20 0-20 0-20 <br /> LCS # 4LCS110797 4LCS110797 4LCS110797 4LCS110797 <br /> Prepared Date 11/7/97 11/7/97 11/7/97 11/7/97 <br /> Analyzed Date 11/7/97 11/7/97 11/7/97 11/7/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20 pg/L. 20 jig/L 20 jug/L 60 pg/L <br /> LCS Result 23 23 23 23 <br /> LCS % Recov 115 115 115 115 <br /> LCS <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> Please Note <br /> The LCS Is a control sample of known, interferent-tree matrix that Is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 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 /> eignature In File 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 /> Alan B Kemp **MS=Matrix Spike MSD=MS Duplicate, RPO=Relative%Difference <br /> Project Manager <br /> 7110119 MPD <4> <br />