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Sequ® 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> ia 404 N WEget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> nalytic r� 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 /> equaia Analytical-San Carlos Client Project 1D L905525, Blaine (Chevron) <br /> 1551 industrial Road Matrix Liquid <br /> San Carlos, CA 94070 <br /> Attention Mike Gregory OC Sample Group 9060223 Reported Jun 17, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO60499 GCO60499 GCO60499 GCO60499 <br /> 802005A 802005A 802005A 802005A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD# 9060225 9060225 9060225 9060225 <br /> Sample Conc N D N D ND ND <br /> Prepared Date 6/4/99 6/4/99 6/4/99 6/4/99 <br /> Analyzed Date 6/4/99 6/4/99 6/4/99 6/4/99 <br /> Instrument LD # HP 5 HP-5 HP 5 HP-5 <br /> Conc Spiked 20ug/L 2opg/L 20yg/L 60ug/L <br /> Result 18 18 18 56 <br /> MS %Recovery 90 90 90 98 <br /> Dup Result 19 19 18 57 <br /> . MSD %Recov 95 95 90 95 <br /> RPD 54 54 00 18 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS# 5LCS060499 5LCS060499 5LCS060499 5LCS060499 <br /> Prepared Date 6/4/99 6/4/99 6/4/99 6/4/99 <br /> Analyzed Date 6/4/99 6/4/99 6/4/99 6/4/99 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20ug/L 20pg/L 20ug/L 60ug/L <br /> LCS Result 19 19 19 58 <br /> LCS % Recov. 95 95 95 97 <br /> LCS 70-130 70130 70-130 70-130 <br /> Control Limits <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 /> the 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 /> W2arl ire We' Water MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager <br /> 9060223 SSS <2> <br />