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Y 660 Chesapeake Drive Redwood City 94063 (650)364-9600 FAX(650)364 9233 <br /> Sequoia <br /> Pyr 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 600 FAX(916)9 21 010 <br /> Analytical 1455819 triker Avenue McDowell Blvduite 8 No North Ste D Petaluma CA 94954CA 34 (707)792 1865 FAX(707)792-0342 0 <br /> loettler-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 9022390-391 Repotted Mas 1i, t959 <br /> ti <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 G Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch# 100NG BTEX 10ONG BTEX 100NG 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 20Erg/L 20ug/L 20Vg/L 60p9/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# 2LCS022699 2LCS022699 2LCS022699 2LCS022699 <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 /> LCS % <br /> Recovery 95 95 95 107 <br /> eC )very <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 an*zed t..�smg U-'e,%arm-seagr3nts <br /> SE=QUOIA ANALYTICAL, ,#1271 preparation,and analytical methods employed for the samples 3kse matrix spike is an al+qur t&sarn,2la <br /> *Ji <br /> fortified with known quantities of specific compounds and subtected to the entire analytical procedure ff <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> nae F4?glEy <br /> Project Manager <br /> 9022390 GGG <2> <br />