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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988%73 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916) 921 0100 <br /> Cambria Client Project ID , Shell 2575 Country Club Blvd <br /> 270 Perkins Avenue Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely QC Sample Group 9712D11 -01-03 Reported Jan 6, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> MS/MSD <br /> Batch#• 7121027 7121027 7121027 7121027 <br /> Date Prepared 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Date Analyzed. 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Instrument I.D #. GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Matrix Splice <br /> % Recovery. 88 84 83 62 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 81 78 79 76 <br /> Relative % <br /> Difference: 8 3 74 3 6 76 <br /> LCS Batch# LCS122397 LCS122397 LCS122397 LCSIM97 <br /> Date Prepared 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Date Analyzed. 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Instrument E�.-+D.# GCHP2 GCHP2 GCHP2 GGHP2 <br /> LLS % <br /> Recovery 94 89 87 87 <br /> ecovery <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> Please Note <br /> SEQUOIA AN YTiCAL The LGS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> Elap# 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 /> regory <br /> Project Manager 9712011 CCC <1> <br /> Manager <br />