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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9x33 <br /> q 404 N Wlget Lane Walnut Creek CA 94598 (975)988-9600 FAX(9Z 5)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 f <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792)0342 <br /> 1551 Industrial Road San Carlos, CA 94070 4111 (650)232-9600 FAX (650)232-9612 <br /> �) <br /> Blaine Tech Services Client Project ID Shell 3725 S Tracy Blvd <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thle QC Sample Group 9903442-01-02 Reported Mar 22, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst BTF <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO31 799BTEX03A <br /> Sample No GW9903286-2MS <br /> Date Prepared 3117199 3117199 3117199 3117199 <br /> Date Analyzed 3/17/99 3117199 3117199 3117199 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Cone uglL N D N D N D N D <br /> Cone Spiked, uglL 10 10 10 3C <br /> Matrix Spike, uglL 9 6 9 3 9 3 28 <br /> % Recovery 96 93 93 94 <br /> Matrix <br /> Spike Duplicate, uglL 9 4 9 1 9 2 28 <br /> % Recovery 94 91 92 93 <br /> Relative % Difference -- - =2-1= - - —2=2=- - = 1 1= 1 1 <br /> RPD Control Limits - 0-25----0-25— -0-25----- --0-25------ -- - ---- - - -- - - - <br /> LCS Batch# GWLCS031799A <br /> Data Prepared 3117/99 3117199 3/17/99 3117199 <br /> Date Analyzed 3117199 3117199 3117199 3117199 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Cone Spiked, uglL 10 10 10 30 <br /> LCS Recovery, uglL 9 7 10 10 31 <br /> LCS %-Recovery 97 102 1_Q3_1 04 <br /> Percent Recovery Contra[ Limits <br /> MS/MSD 60-140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 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 /> 7the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> K ' n Kimy <br /> Project Manager <br />