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Sequoia 690 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(550) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988-9673 <br /> Analytical 819 Striker 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 /> ECOR 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# GCO91698 GCO91698 GCO91698 GC091698 <br /> 802005A 802005A 802005A 802005A <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 # 8091173 8091173 8091173 8091173 <br /> Sample Conc ND N D ND IN D <br /> Prepared Date 9/16/98 9/16/98 9/16/98 9/16/98 <br /> Analyzed Date 9/16/98 9/16/98 9/16/98 9/16/98 <br /> Instrument I D # HP-5 HP 5 HP-5 HP-5 <br /> Conc Spiked 20ug/L 20ug/1- 20ug/L 60ug/L <br /> Result 18 19 18 58 <br /> MS % Recovery 90 95 90 97 <br /> Dup Result 18 19 18 57 <br /> 0 MSD % Recov 90 95 90 95 <br /> RPD 00 00 00 17 <br /> RPD Limit 020 020 020 020 <br /> w <br /> LCS # SLCS091698 5LCS091698 5LCS091698 5LCS091698 <br /> Prepared Date 9/16/98 9/16/98 9/16/98 9/16/98 <br /> Analyzed Date 9/16/98 9/16/98 9/16/98 9/16/98 <br /> Instrument I D # HP-5 HP 5 HP-5 HIPS <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 6oug/L <br /> LCS Result 19 19 18 58 <br /> LCS % Recov 95 95 90 97 <br /> LCS 70-130 70130 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 /> /} <br /> &Ct-k <br /> fortified withknown quantities of specific compounds and subjected to the entire analytical procedure If <br /> Vp,,wery 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 /> Melissa A Brewer ;*MS=Matrix Spike MSD=MS Duplicate RPD=Retatwe% Difference <br /> Project Manager <br /> 8091172 SEC <3> <br />