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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 4 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0I00 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 {707)792-1865 FAX(707)792-0342 <br /> IGettler-Ryan - Dublin Client Project ID Tosco #6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Vapor <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9011763-764 Reported 'Feb 10, 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 10ONG BTEX 10ONG BTEX 10ONG BTEX <br /> Date Prepared 1/28/99 1/28/99 1/28/99 1/28/99 <br /> Date Analyzed 1/28/99 1/28/99 1/28/99 1/28/99 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> Conic Spiked 2 0 Erg/L 2 0 ug/L 2 0 Erg/L 6 0 ug/L <br /> Matrix Spike <br /> %Recovery 95 95 95 98 <br /> is Matrix Spike <br /> Duplicate% <br /> Recovery 90 85 80 93 <br /> Relative% <br /> Difference 5 4 11 17 5 2 <br /> LCS Batch# 2LCS012899 2LCS012899 2LCS012899 2LCS012899 <br /> Date Prepared 1/28/99 1/28/99 1/28/99 1/28/99 <br /> Date Analyzed 1/28/99 1/28/99 1/28/99 1/28/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP 2 <br /> LCS % <br /> Recovery 900 850 900 97 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> Please Note <br /> The LGS is a control sample of kaovm,vnkntetertitirw matrix t,«at is.analyzed using thre wmp reagent <br /> SEQUOIA ANALYTICAL,#1271 preparation,and anatytmal methods employed for the samples The matrix spike it an aliquot of sarnple <br /> ` fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoveEX is to be used to validate the batch <br /> CLLianne Fegley <br /> Project Manager <br /> 9011763 GET <2> <br />