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Sequoia 680 Chesapeake Drive Redwood City CA 94063 x--'(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)921-9600 FAX`916)921-0100 <br /> 1455 McDowell Stvd 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 AT&T Lodi 81059 0019 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention David Oliver QC Sample Group 9903152-01-04 Reported Mar 9, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015 <br /> Analyst R GECKLER <br /> ANALYTE Gasoline <br /> QC Batch# GC030599BTEXEXA <br /> Sample No 9902D88-1 <br /> Date Prepared 315199 <br /> Date Analyzed 315199 <br /> Instrument 10# GCHP22 <br /> Sample Conc , mg/Kg N D <br /> Conc Spiked, mg/Kg 5 0 <br /> Matrix Spike, m9/K9 5 0 <br /> 96 Recovery 100 <br /> Matrix <br /> Spike Duplicate, mg/Kg 4 5 <br /> % Recovery 90 <br /> Relative % Difference 11 <br /> RPO Control Limits 0-25 <br /> LCS Batch# GC030599BTEXEXA <br /> Date Prepared 315199 <br /> Date Analyzed 315199 <br /> Instrument I D # GCHP22 <br /> Conc Spiked, mg/Kg 5 0 <br /> Recovery, mg/Kg 54 <br /> LCS % Recovery 108 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <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 /> UOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> lo 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 fell within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> �KayGan Kimyai <br /> Project Manager <br />