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4 <br /> 404 N Wiget Lane <br /> Sequoia Walnut Geek,CA 94598 <br /> (925)98$-9600 <br /> �rill� Analytical FAX(925)988-9673 <br /> i <br /> Gettler-Ryan - Dublin Client Project 10 Tosco S8#6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9071230-243 Reported Aug 4, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8024 EPA 8020 EPA 8020 <br /> Analyst' D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch# 9071217 9071217 9071217 9071217 <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 5 HP-5 HP-5 HP-5 <br /> Cone Spiked 20pg/L 20pg/L 20pg/L 60mg/L <br /> Matrix Spike <br /> . % Recovery 95 100 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 105 105 108 <br /> Relative% <br /> Difference 51 49 49 47 <br /> LCS Batch# 5LCS072399 5LC5072399 5LCS072399 5LCS072399 <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-5 HP-5 HP 5 HP-5 <br /> LCS % <br /> Recovery 95 100 100 143 <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 It <br /> wLt 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 /> 71iAanne Fegley <br /> Project Manager 9071230 GET 18- <br />