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S � • 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX 1650) 364-9233 <br /> equoia 404 N. Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925) 988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento.CA 95834 (916)9Z 1-9600 FAX(916) 921-0100 <br /> �„�► 455 McDowell Blvd. North,Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> Analytical ',551 industrial Road San Carlos.CA 94070-4111 (650)232-9600 FAX(650) 232-9612 <br /> "equoia Analytical Tient Project ID: L905420 J Blaine fiech Service <br /> 551 Industrial Blvd. Matrix. Liquid <br /> San Carlos, CA 94070 <br /> Attention: Mike Gregory OC Sample Group. 9052113-122 Reported: Jun 17, 1999, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC060199 GC060199 GC060199 GCO60199 <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: D.Newcomb D.Newcomb D.Newcomb D. Newcomb <br /> MS/MSD #: 9052088 9052088 9052088 9052088 <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 06/01/99 06/01/99 06/01/99 06/01/99 <br /> Analyzer[ Date: 06/01/99 06/01/99 06/01/99 06/01/99 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 <br /> Cone. Spiked: 20pg/L 20Ng/L 20Ng/L eopg/L <br /> Result: 19 19 19 56 <br /> MS % Recovery: 95 95 95 93 <br /> Dup. Result: 19 19 19 59 <br />•MSD % Recow 95 95 95 98 <br /> RPD: 0.0 0.0 0.0 5.2 <br /> RPD Limit: 0-20 0-20 0-20 0-20 <br /> LCS #: 5LCS060199 5LCS060199 5LCS060199 5LCS060199 <br /> Prepared Date: 06/01/99 06/01/99 06/01/99 05/01/99 <br /> Analyzed Date: 06/01/99 06/01/99 06/01/99 06/01/99 <br /> Instrument LD.#: HP-5 HP-5 HP-5 HP-5 <br /> Cone. Spiked: 20 frg/L 20 p9/L 20pg/L 60 pg/L <br /> LCS Result: 20 19 19 60 <br /> LCS % Recon.: 100 95 95 100 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> PleaseNote: <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 /> 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 /> harlie Westwater IVIS = Matrix Spike, = up irate, = Helative Difference <br /> reject Manager <br /> 9052113.SSS <4> <br />