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• v1✓� Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 Wi40 <br /> Analytical 4 N get Lane walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Sinker 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 /> Oettler-Ryan, Inc Client Project ID Tosco #6981, Stockton <br /> 3164 Gold Camp Dr , Ste #240 Matrix Vapor <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter QC Sample Group 9030228-229 Reported Mar 12, 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 C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch# 10ONG BTEX 100NG BTEX 10ONG BTEX 100NG BTEX <br /> Date Prepared 2/26/99 2/26/99 2/26/99 2/26/99 <br /> Date Analyzed 2/26/99 2/26/99 2/26/99 2/26/99 <br /> Instrument I D # HP 2 HP-2 HP 2 HP 2 <br /> Conc Spiked 20,ug/L 20pg/L 20pg/L 60yg/L <br /> Matrix Spike <br /> % Recovery 115 105 110 117 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 95 90 98 <br /> Relative % <br /> Difference 14 10 20 17 <br /> LCS Batch# 2LCS030399 2LCS030399 2LCS030399 2LCS030399 <br /> Date Prepared 3/3/99 3/3/99 3/3/99 3/3/99 <br /> Date Analyzed 3/3/99 3/3/99 3/3/99 3/3/99 <br /> Instrument 1 D # HP 2 HP 2 HP-2 HP 2 <br /> LCS % <br /> Recovery 90 90 95 103 <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,Intederent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods empioyed for the samples The matrix spike Is an aliquot of sampte <br /> • fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> Yl� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> t�nne <br /> interference,the LCS recoveryis to be used to validate the batch <br /> Fegley <br /> Project Manager <br /> 9030228 GGG <2> <br />