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I <br /> w <br /> ,t• <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9 <br /> 233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792 0342 <br /> Ta'ettler-Ryan, Inc Client Project ID Tosco #4707, Stockton <br /> 3164 Gold Camp Dr, Ste #240 Matrix Vapor <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter QC Sample Group 9010120-121 Reported Jan 15, 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 D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch# 10ONG BTEX 100NG BTEX 10ONG BTEX 10ONG BTEX <br /> Date Prepared 1/11/99 1/11/99 1/11/99 1/11/99 <br /> Date Analyzed 1/11/99 1/11/99 1/11/99 1/11/99 <br /> Instrument I D # HP-2 HP 2 HP-2 HP 2 <br /> Cone Spiked 2 0 Ng/L 2 0 erg/L 2 Opg/L 6 0 pg/L <br /> Matrix Spike <br /> % Recovery 95 85 85 87 <br /> 49 Matrix Spike <br /> Duplicate % <br /> Recovery loo 95 100 103 <br /> Relative % <br /> Difference 51 11 15 18 <br /> LCS Batch# 2LCS011199 21-CSO11199 2LCS011199 2LCS011199 <br /> Date Prepared 1/11/99 1/11/99 1/11/99 1/11/99 <br /> Date Analyzed 1/11/99 1/11/99 1/11/99 1/11/99 <br /> Instrument i D # HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery 850 900 950 3,050 <br /> Recovery <br /> Control Limits 70-130 70130 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 /> v� ✓Y1i/� � L� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> 1 interference,the LCS recovery is to be used to validate the batch <br /> 11tanne Fegley <br /> Project Manager <br /> 9010120 GGG <2> <br />