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uoia 680 Chesapeake Drive Redwood Crty CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Seq 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)911 9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North S e D Petaluma,CA 94954 (707)792 1865 FAX(707)792 0342 <br /> I <br /> Ground Zero Analysis, Inc Client Project 1D 96-163 <br /> 1714 Main St <br /> Escalon, CA 95320 <br /> Attention Jeanne Suelethos QC Sample Group 9805691-01, 02 Reported Jun 10, 1,998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst C Demartim <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO52198BTEX02A <br /> Sample No GW9805C13 3 <br /> Date Prepared 5/21198 5/21198 5121198 5121/98 <br /> Date Analyzed 5121198 5/21198 5121198 5121198 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Conc , ug/L N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 8 2 8 0 8 2 25 <br /> % Recovery 82 80 E2 83 <br /> Matrix <br /> Spike Duplicate ug/L 8 1 7 9 8 1 25 <br /> % Recovery 81 79 €1 83 <br /> Relative % Difference 1 2 1 3 1 2 0 0 <br /> RPD Control Limits 025 0-25 0-25 025 <br /> LCS Batch# GAWBLK052198A <br /> Date Prepared 5121198 5121198 5121198 5121198 <br /> Date Analyzed 5121198 5/21/98 5121/98 5121198 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> � 5 <br /> Conc Spiked, ug1L 10 10 10 30 <br /> LCS Recovery ug/L 8 4 8 2 8 5 26 <br /> LCS % Recovery 84 82 85 87 <br /> Percent Recovery Control Limits <br /> MSIMS0 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sampie 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 recoverl is to be used to validate the batch <br /> i Lucrece Tom <br /> l Project Manager <br />