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. Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> Ci) 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(5 10)988-9673 <br /> $19 Striker Avenue Suote 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> i <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-4275/980326-G1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9803157 -01-09, Reported Apr 21, 1998 <br /> 9803158-10-11 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> CC Batch# GCO40298802007A GCO40298802007A GCO40298802007A GC040298802007A GCO40298802007A <br /> Analy. Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst SL SL SL SL SL <br /> MS/MSD# 98030807 98030807 98030807 98030807 <br /> Sample Conc 136 N D N D N D <br /> Prepared Date 4/2/98 4/2/98 4/2/98 4/2/98 <br /> Analyzed Date 4/2/98 4/2/98 4/2/98 4/2/98 <br /> Instrument LD # GC7 GC7 GC7 GC7 <br /> Conc. Spiked 20 fug/L 20 fug/L 20 fug/L 60 fug/L <br /> Result 243 227 24 728 <br /> MS % Recovery 115 114 120 121 <br /> Dup Result 232 216 227 694 <br /> MSD % Recov 109 108 114 116 <br /> RPD 46 50 56 48 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# LCSO40298 LCSO40298 LCSO40298 LCSO40298 LCSO40298 <br /> Prepared Date- 4/2/98 4/2/98 4/2/98 4/2/98 4/2/98 <br /> Analyzed Date. 4/2/98 4/2/98 4/2/98 4/2/98 4/2/98 <br /> Instrument LD #- GC7 GC7 GC7 GC7 GC7 <br /> Conc. Spiked 20 fig/L 20 fug/L 20 fig/L 60 fug/L 500 pg/L <br /> LCS Result: 221 223 233 72 464 <br /> LCS % Recov. 111 112 117 120 93 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> AN LYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 0 DaP42 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 /> terference,the LCS recovery is to be used to validate the batch <br /> nneranager ** S=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803157 BLA <1> <br />