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Sequoia 680 Chesapeake Drive Redwood City CA 94063 x(650)364-9600 FAX(650)364-9233 <br /> 41) 404 N mget Lane Walnut Creek CA 94548 (925)488-9600 FAX(925)988-9673 <br /> frill) Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North,Ste D f etaluma.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 61059 0019 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention David Oliver QC Sample Group 9903145-01-07 Reported Mar 11, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015 <br /> Analyst ETER ALCALA <br /> ANALYTE Gasoline <br /> QC Batch#. GC030499BTEXEXA <br /> Sample No GS9902B88-1 <br /> Date Prepared 314199 <br /> Date Analyzed 314199 <br /> Instrument I D# GCHP18 <br /> ample Conc,mg1K9 N D <br /> Conc Spiked,m91K9 so <br /> Spike,mg/Kg 55 <br /> %Recovery 110 <br /> Matrix <br /> Ike Duplicate,mg/Kg 48 <br /> %Recovery 96 <br /> elative%Difference 14 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC030499BTEXl=XA <br /> Date Prepared 314199 <br /> Date Analyzed 314199 <br /> Instrument I DX GCHP18 <br /> Conc Spiked,mg/Kg 50 <br /> Recovery,mg1Kg• 54 <br /> LCS%Recovery 108 <br /> Percent Recovery Control Limits. <br /> MS/MSD 60.140 <br /> LCs 70.130 <br /> s <br /> lity Assurance Statement Ail 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 knuts due to matrix <br /> interference the LCS recovev Is to be used to validate the batch <br /> Kayya4i� imy I <br /> Project Man er <br />