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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> fr�ll>� Analytical 819 Stnker 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 9712D12 -01-03 Reported Jan 8, 1998 ti <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# 7121007 7121007 7121007 7121007 <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 1.13 #' GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Matrix Spike <br /> % Recovery. 95 86 90 89 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery, 8s 80 83 84 <br /> Relative % <br /> Difference. 7 6 72 81 58 <br /> LCS Batch#• LCS122397 LCS122397 LCS122397 LCS122397 <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 #- GCHP1 GCHP1 GCHP1 GCHP1 <br /> LCS % <br /> Recovery 98 89 92 92 <br /> % Recovery <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a central sample of known,interferent free matrix that is analyzed using the same reagents, <br /> Elap#162 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities at specific compounds and subjected to the entire analytical procedure It <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 9712o12 CCC 41> <br />