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Sequoia <br /> b80 Cnesapeakc Dnvc Redwood City CA 94063 (415) 364 9600 FAX 415) 364 9233 <br /> 404 ,V WLgec Lane Walnut Creek CA 94598 (510) 988 9600 FAX;510) 998 9673 <br /> Analytical 319 Striker Avenue Suite 8 Sacramento CA 95834 1,9161 921 9600 FAX (916) 921 01000 <br /> Delta Environmental Consultants talent Project ID Exxon 7-3708, Stockton <br /> 3164 Gold Camp Drive, #200 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati Work Order # 9510535 -01- 08 Reported Oct 13, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC100995BTEX01A GC1009953TEX01A GC100995STEXOIA GC1009956TEX01A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EIIA 5030 <br /> Analyst E Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/MSS] # 950940-01 9509J50-01 9509J50-01 9509JSO-01 <br /> Sample Cone. N D N 0 N D N D <br /> Prepared Date- 10/9/95 10/9/95 10/9/95 10/9/95 <br /> Analyzed Date- 10/9/95 10/9/95 10/9/95 10/9/95 <br /> Instrument 1 D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result- 8 a as 88 26 <br /> MS % Recovery 88 88 88 87 <br /> Dup Result 10 99 10 30 <br /> MSD % Recov .. 100 99 100 100 <br /> RPD 13 12 13 14 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # <br /> Prepared Date <br /> Analyzed Date: <br /> Instrument I D.# <br /> Cone. Spiked: <br /> LCS Result: <br /> LCS % Recov <br /> LCS 71 133 72-128 72-130 71-120 <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 preparation,and analytical methods employed for the samples The matrix spike is an aiiauot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of anaiytes 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 /> Mike Gregory <br /> Project Manager "MS=Matrix Spike MSD=MS Oupiicate RPO=Relative%Difference 9510535 DLT _1> <br />