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1 <br /> Sequoia 680 Chesapeake Drive Redwood Clry CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 44W1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 7Ground Zero Analysis, Inc Client Project ID 96-163 Knowles Rock <br /> Main Street <br /> Escalon, CA 95320 <br /> Attention Greg Stahl QC Sample Group 9901867-01 Reported Feb 1, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst BTF <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC01219911TEX03A <br /> Sample No GW9901573-05 <br /> Date Prepared 1121199 1121199 1121199 1121199 <br /> Date Analyzed 1121199 1121199 1121199 1121199 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample COnC , ug/L N D N D N D N D <br /> ' Conc Spiked, ug1L 10 10 10 30 <br /> Matrix Spike, ug/L 8 8 9 2 9 5 28 <br /> % Recovery 88 92 95 95 <br /> Matrix <br /> Spike Duplicate, ug/L 9 1 9 5 9 8 29 <br /> % Recovery 91 95 98 97 <br /> Relative % Difference 3 4 3 2 3 1 2 1 <br /> RPD Control Limits 0-25 0-25 0-25 025 <br /> LCS Batch# GC012199BTEX03A <br /> ' Date Prepared 1121199 1121199 1121199 1121199 <br /> Date Analyzed 1121199 1121199 1121199 1121199 <br /> Instrument 1 D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> ' Conc Spiked, uglL 10 10 10 30 <br /> LCS Recovery ug1L 9 0 8 8 9 0 27 <br /> ILCS % Recovery 90 88 90 90 <br /> Percent Recovery Control Limits <br /> ' IIS/MSD 60140 60140 60140 60140 <br /> LCS 70 130 70 130 70 130 70 130 <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 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 recover is to be used to validate the batch <br /> Mara rrslis <br /> Project Manager <br /> 1 <br />