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Sequoia 680 Chesapeake Drive Redwood Cry CA 94063 ((559) 364 9600 FAX(650)364-9233 <br /> • ,, 404 N Wiger Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> WAPAnalytical 819 Striker Avenue Suite 8 Sacramento C4 95834 (916)921 9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)791-0342 <br /> Blame Tech Services, Inc Client Project ID Chevron 9-1848/ 980520-L2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9805E65 -01-04 Reported Jun 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# 05V8195 05V8195 05VB195 05V8195 <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method N A N A N A N A <br /> Analyst L Hall L Hall L Hall L Hail <br /> LCS/LCSD# 1-108052898 LCS052898 LCS052898 LCS052898 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 5/28/98 5/28/98 5/28/98 5/28/98 <br /> Analyzed Date 5/29/98 5/29/98 5/29/98 5/29/98 <br /> Instrument I D # - <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 20 ug/L <br /> Result 19 19 17 19 <br /> LCS % Recovery 95 95 85 95 <br /> Dup Result 19 18 17 18 <br /> LCSD % Recov 95 90 85 90 <br /> RPD 00 54 00 54 <br /> RPD Limit 0-25 025 0-25 0-25 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS 1s a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> VjectVanayger <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 spice does not fall within specified control limits due to matrix <br /> Interference,the LCS recovery Is to be used to validate the batch <br /> re <br /> **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9805E65 8LA <1> <br /> I <br />