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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 455 McDowell Blvd North Sten Petaluma CA 94954 (707)792-1865 FAX(707)791-0342 <br /> Analytical ',551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Gettler- Ryan, Inc Client Project ID TOSCO#6981, Stockton <br /> 3164 Gold Camp Or, Ste#240 Matrix Vapor <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter OC Sample Group 9061 71 4-71 5 Reported Jul 8, 1999 <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 J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 10ONG BTEX 10ONG BTEX 100NG BTEX 10ONG BTEX <br /> Date Prepared 6/18/99 6/18/99 6/18/99 6/18/99 <br /> Date Analyzed 6/18/99 6/18/99 6/18/99 6/18/99 <br /> Instrument I D # HP 2 HP 2 HP-2 HP-2 <br /> Conc Spiked 2oug/L 20ug/L 20ftg/L 60yg/L <br /> Matrix Spike <br /> % Recovery 80 70 75 82 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 75 65 75 72 <br /> Relative% <br /> Difference 65 74 00 13 <br /> LCS Batch# 2LCS052399 2LCS062399 2LCS062399 2LCS062399 <br /> Date Prepared 6/23/99 6/23/99 6/23/99 6/23/99 <br /> Date Analyzed 6/23/99 6/23/99 6/23/99 6/23/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 95 90 90 102 <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 /> t � the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoveryis to be used to validate the batch <br /> Ilanne Fegley <br /> Project Manager <br /> 9061714 GGG <27 <br />