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® Sequoia 680 Chesapeake Drive Redwood C,ty 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 Stnkcr Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> is <br /> Pacific Environmental Group Client Project ID 320-135 1A/9-6171, Stockton <br /> 2025 Gateway Place, Suite 440 Matrix SOLID <br /> San Jose, CA 95110 <br /> Attention Maree Doden Work Order# 9509106 10-15 Reported Oct 10, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC1002958TEXEXC GC100295BTEXEXC GC100295BTEXEXC GC100295BTF-XEXC <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst R GecMer R Geckler R Geckler R Geckler <br /> MS/MSD # 9509F1903 9509F1903 9509F1903 9509FI903 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Analyzed Date 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 019 019 019 058 <br /> MS % Recovery 95 95 95 97 <br /> Dup Result 019 020 020 060 <br /> MSD % Recov 95 100 100 100 <br /> RPD 00 51 51 34 <br /> RPD Limit 050 050 0-50 050 <br /> LCS # <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D # <br /> Cone Spiked <br /> LCS Result <br /> LCS % Recov <br /> LCS <br /> Control Limits 55 145 47-149 47-155 56-140 <br /> Rease Note <br /> The LCS is a control sample of known,interferent-free matrix that Is analyzed using the same reagents, <br /> SEQU IA 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 /> W—D 46��1 interference,the LCS recovery Is to be used to validate the batch <br /> Brucie Fletcher <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplscate, RPD=Relative%Difference 9509106 PPP <2> <br /> ca <br />