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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> ,!D404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> %l0 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> i <br /> Enviros Client Project ID Shell 141 N EI Dorado, Stock <br /> x270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Clyde Galantine Work Order# 9604D36 -01 Reported Apr 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC041996BTEX17A GCO41996BTEX17A GCO41996BTEX17A GC041996BTEX17A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD #. G9604857-03C G9604857-03C G9604857-03C G9604857-03C <br /> Sample Cone • N D N D N D N D <br /> Prepared Date 4/19/96 4/19/96 4/19/96 4/19/96 <br /> Analyzed Date 4/19/96 4/19/96 4/19/96 4/19/96 <br /> Instrument 1.10 #' GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone. Spiked- 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 94 93 92 27 <br /> MS%Recovery 94 93 92 90 <br /> Dup Result 90 88 89 26 <br /> MSD % Recov: 90 88 89 87 <br /> RPD 43 55 33 38 <br /> RPD Limit, 0-50 0-50 0-50 0-50 <br /> LCS # GBLKG41996A GBLK041996A GBLK041996A GBLK041996A <br /> Prepared Date: 4/19/96 4/19/96 4/19/96 4/19/96 <br /> Analyzed Date 4/19/96 4/19/96 4/19/96 4/19/96 <br /> Instrument 1 D.#. GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked. 10 ug/L 10 ug/L i0 ug/L 30 ug/L <br /> LCS Result: 90 90 90 27 <br /> LCS % Recov • 90 90 90 90 <br /> LCS 70-130 70-130 70-130 70-130 <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 aliquot of sample <br /> torhfied with known quantities of specific compounds and subjected to the entire analytical procedure tf <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 /> ike Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9604❑36 EEE a1> <br /> a°C� <br />