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(5) Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wtget Lane Walnut Creck CA 94598 (510) 988 9600 FAX (510)998 9673 <br /> Iwo Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Pacific Environmental Group Client Project ID 310-040 5A/2859, Stockton - <br /> 2025 Gateway Place, Suite 440 <br /> San Jose, CA 95110 <br /> Attention Andrew Lehane Work Order# 9604721 01, 02 Reported Apr 18, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC041196BTEX17A GC0411968TEX17A GCO41196BTEX17A GCD41196BTEK17A <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#: 9603J2106 9603J2106 96=2106 9603J2106 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Instrument I D# GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10ug/L 10pg/L 10pg/L 30yg/L <br /> Result 97 98 97 29 <br /> MS % Recovery 97 98 97 97 <br /> Dup Result 93 92 92 27 <br /> MSD % Recov 93 92 92 90 <br /> RPD 42 63 53 71 <br /> RPD Limit <br /> LCS#' BLK041196 BLK041195 BLK041196 BLK041196 <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10Ng/L 10jtg/L 10pg/L 30Ng/L <br /> LCS Result. 96 96 96 29 <br /> LCS %Recov 96 96 96 97 <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 /> . <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 H <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 /> Claudia Hirotsu <br /> Project Manager '"'MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9604721 PPP <1> <br />