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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9Z33 <br /> 404 N Wi8et Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988 9673 <br /> (1) <br /> Analytical 819 Striker Avenue Suite 8 5acramento 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 /> Blaine Tech Services, Inc Client Project ID Texaco 440 W Charter Way <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Deidre Kerwin Work Order# 9808753 -01-06 Reported Aug 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# 8080306 8080306 8080306 8080306 <br /> Analy Method EPA 8020 EPA 6020 EPA 8020 EPA 8020 <br /> Prep Method EPA 8015M EPA 8015M EPA 8015M EPA 8015M <br /> Analyst S Forbes S Forbes S Forbes S Forbes <br /> MS/MSD# BLK082098 BLK082098 BLK082098 BLK082098 <br /> Sample Conc N D N D N D ND <br /> Prepared Date 8/20/98 8/20/98 8/20/98 8/20/98 <br /> Analyzed Date 8/20/98 8/20/98 8/20/98 8/20/98 <br /> Instrument I D # - - - <br /> Conc Spiked 100pg/L 100pg/L 100pg/L 300 pg/L <br /> Result 976 973 935 289 <br /> MS % Recovery 976 973 935 963 <br />. Dup Result 989 985 948 292 <br /> MSD % Recov 989 985 948 973 <br /> RPD 13 12 14 10 <br /> RPD Limit 05 0-6 04 0-5 <br /> LCS # LCS082098 LCS082098 LCS082098 LCS082098 <br /> Prepared Date 8/20/98 8/20/98 8/20/98 8/20/98 <br /> Analyzed Date 8/20/98 8/20/98 8/20/98 8/20/98 <br /> Instrument I D # - - <br /> Conc Spiked 100 ug/L 100 ug/L 100 ug/L 300,ug/L <br /> LCS Result 98 975 94 290 <br /> LCS % Recov 98 975 94 967 <br /> 82-119 80-114 66-125 73119 <br /> LCS 84-116 81-117 79-115 80-114 <br /> Control Limits <br /> Please Note <br /> VSEQUOIAALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 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 /> er <br /> ager **MS=Matrix Spike, MSD=MS Duplicate, RPD-Relative%Difference 9808753 BLA <1> <br />