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6ao�esajxake Drive Redwood City CA 94063 650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 404 N Wigct lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento G 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,G 94954 (707)79Z-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 61059 0019 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 9531-1502 <br /> Attention David Oliver QC Sample Group 9903145-01-07 Reported Mar 9, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015M <br /> Analyst J BONNVILLE <br /> ANALYTE Diesel <br /> QC Batch# GC0304990HBPEXC <br /> Sample No 9902D36-1 <br /> Date Prepared 311199 <br /> Date Analyzed 3/2199 <br /> Instrument 1 D# GCHP4A <br /> Sample Conc , mg/Kg 1 3 mg/Kg MS & MSD ARE REFFERED <br /> Conc Spiked, mg/Kg 17 FROM GC0301990HBPEXC <br /> ,M,,tr,x Spike, mg1Kg 14 <br /> % Recovery 75 <br /> Matrix <br /> Spike Duplicate, mg/Kg 15 <br /> % Recovery 61 <br /> Relative % Difference 7 7 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK030499CS <br /> Date Prepared 3!4199 <br /> Date Analyzed 314199 <br /> Instrument I D# GCHPSA <br /> Conc Spiked, mg1Kg 17 <br /> Recovery, mg/Kg 15 <br /> LCS % Recovery 88 <br /> Percent Recovery Control Limits <br /> MS1MSo 50-150 <br /> LCS 60-140 <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 some reagents, <br /> QUOIA 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 /> <I // interference the LCS recovery is to be used to validate the batch <br /> Kayv lmyaf <br /> Prefect Manag <br />