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Sequoia 6>3o Chesapeake Drive Redwood City =A 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget cane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> 4ECOF3 Client Project ID Arco #2093, Tracy <br /> 9912 Business Park Drive Suite 100 Matrix Liquid <br /> Sacramento, CA 95827 <br /> Attention Rusty Benkosky QC Sample Group 8091172-182 Reported Sep 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO91798 GCO91798 GC091798 GCO91798 <br /> 802002A 802002A 802002A 802002A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 8091260 8091260 8091260 8091260 <br /> Sample Conc N D N D N D ND <br /> Prepared Date 9/17/98 9/17/98 9/17/98 9/17/98 <br /> Analyzed Date 9/17/98 9/17/98 9/17/98 9/17/98 <br /> Instrument I D # HP-2 HP 2 HP 2 HP 2 <br /> Conc Spiked 20frg/L 20ug/L 20lrg/L 60ug/L <br /> Result 20 19 19 56 <br /> MS % Recovery 100 95 95 93 <br /> Dup Result 21 20 20 58 <br /> 0 MSD % Recov 105 100 100 97 <br /> RPD 49 51 51 35 <br /> RPD Limit 0-20 020 0-20 0-20 <br /> LCS # 2LOS091798 2LOS091798 2LCS091798 2LCS091798 <br /> Prepared Date 9/17/98 9/17/98 9/17/98 9/17/98 <br /> Analyzed Date 9/17/98 9/17/98 9/17/98 9/17/98 <br /> Instrument l D # HP-2 HP 2 HP-2 HP-2 <br /> Conc Spiked 20fig/L 20ug/L 20Ng/L 60ug/L <br /> LCS Result 19 19 19 58 <br /> LCS % Recov 95 95 95 97 <br /> LCS 70130 70-130 70-130 70130 <br /> Control Limits <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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, #1271 preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> nfortified with known quantities of specific compounds and subjected to the entire analytical procedure 11 <br /> 1 6 eSveryof 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 /> Melissa A Br@Wer **MS=Matrix Spike USD=MS Duplicate RPD=Relative% Difference <br /> Project Manager <br /> 8091172 SEC ¢4> <br />