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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> {9z5}981.9600 <br /> Analytical FAX(M)988-9673 <br /> t; ry <br /> ettler-?yari=l ubhn v'h ry Client Project Iii h Unocal Circlie K SS#1205, Lathrop <br /> 6747 Sierra Court, Suite J Matra Liquid <br /> Dublin, CA 94568 w <br /> Attention Deanna Harding QC Sample Group 9071248-252 Reported Aug 3, 1999 <br /> .... ' r s v hv. n n .. ♦ t t v n5+n L ti n es . ..L nv r s tn i n v i n rv } ..o f ..r r v Av �}w y w. ns x n�vnfk r r -'r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch#: 9071168 9071168 9071168 9071168 <br /> Date Prepared 7/23/99 7/23/99 7/23/99 7/23/99 <br /> Date Analyzed 7/23/99 7/23/99 7/23/99 7/23/99 <br /> Instrument I D # HP-4 HPA HP-4 HP-4 <br /> Conc. Spiked 20,ug/L 20ug/L 20yg/L 60yg/L <br /> Matrix Spike <br /> % Recovery 105 95 110 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery. 110 95 105 110 <br /> Relative% <br /> Difference. 47 00 47 is <br /> LCS Batch#" 4LCS072399 4LCS072399 4LCS072399 4LCS072399 <br /> Date Prepared. 7/23/99 7/23/99 7/23/99 7/23/99 <br /> Date Analyzed' 7/23/99 7/23/99 7/23/99 7/23/99 <br /> Instrument I D #: HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery- 110 95 95 r,110 <br /> Recovery <br /> Control Limits. 70-130 70-130 70-130 70-130 <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, #1271 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 /> J4/ the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> ir interference,the LCS recoveryis to be used to validate the batch <br /> ianne Fegley <br /> Project Manager <br /> ,¢ 9071248 GET <6> <br />