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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Sutte 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Envlros N Client Project ID hShell 4315 Waterloo, Stockton <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9602G27 -01 -03 <br /> Reported Mar 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#' GCO22696BTEXEXB GCO22696BTEXEKB GCO22696BTEXEXB GCO22696BTEXEXB <br /> Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method- EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: E Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/MSD#. 9602C89-05 9602C89-05 9602CS"5 9602089-05 <br /> Sample Cone : N D N D N D N D <br /> Prepared Date 2/26/96 2/26/96 2/26/96 2/26/96 <br /> Analyzed Date. 2/26/96 2/26/96 2/26/96 2/26/96 <br /> Instrument I D #. GCHP1 GCHP1 GCHP1 GGHP1 <br /> Cone Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Result. 017 017 017 052 <br /> MS% Recovery 85 85 85 87 <br /> • Dup. Result: 017 017 018 052 <br /> MSD % Recov 85 85 90 87 <br /> RPD 00 0o 57 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS# GBLK022696BS-A GBLK022596BS-A BLK022696BS-A GBLK022896BS-A <br /> Prepared Date: 2/26/96 2/26/96 2/26/96 2/26/96 <br /> Analyzed Date 2/26/96 2/26/96 2/26/96 2/26/96 <br /> Instrument I D.#: GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Result- 019 020 020 059 <br /> LCS % Recov 95 100 100 98 <br /> LCS <br /> Control Limds 50-150 50.150 50-150 50-150 <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 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 /> Mi a Gregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9602G27 EEE <1 n <br />