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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)925-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> ATC Associates, Inc Client Project ID Thlemann's Service 62605 0001 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9904530-01 Reported Apr 27 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst JAB <br /> ANALYTE Gasoline <br /> QC Batch# GC042099BTEX30A <br /> Sample No GW9904751-2 <br /> Date Prepared 4120199 <br /> Date Analyzed 4120/99 <br /> Instrument i D# GCHP30 <br /> Sample Cone, ug/L N D <br /> Conc Spiked, ug1L 250 <br /> Matrix Spike, ug1L 270 <br /> % Recovery 108 <br /> Matrix <br /> pike Duplicate, ug/L 260 <br /> % Recovery 104 <br /> elative% Difference 38 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC042099BTEX30A <br /> Date Prepared 4120199 <br /> Date Analyzed 4120199 <br /> Instrument I D# GCHP30 <br /> Cone Spiked, ug1L 250 <br /> LCS Recovery, ug/L 250 <br /> LCS% Recovery 1000 <br /> Percent Recovery Control Limits <br /> F- <br /> IVISIMSD 60-140 <br /> LCS 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 quaribbes 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 /> Kay <br /> Prot c Ma ger <br />