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f ■ , Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9333 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> WI,7 Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921-0100 <br /> - <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# 9605154 01 Reported May 10, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC050396BTEX0313 GC050396BTEX03B GCO50396BTEX038 GC050396BTEX03B <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 # 9604F9104 9604F9104 9604F9104 9604F9104 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 5/3/96 5/3/96 5/3/96 5/3/96 <br /> Analyzed Date 5/3/96 5/3/96 5/3/96 5/3/96 <br /> Instrument 1 D # GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10lrg/L 10,ug/L 10Jtg/L 30pg/L <br /> Result 10 11 11 32 <br /> MS % Recovery 100 110 110 107 <br /> Dup Result 11 11 11 31 <br /> MSD % Recov 110 110 110 103 <br /> RPD 95 00 00 82 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK050396 BLK050396 BLK050396 BLK050396 <br /> Prepared Date 5/3/96 5/3/96 5/3/96 5/3/96 <br /> Analyzed Date 5/3/96 5/3/96 5/3/96 5/3/96 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10Pg/L 10ug/L 10Y9/L 30ug/L <br /> LCS Result 10 10 11 31 <br /> LCS % Recov 100 100 110 103 <br /> 60-140 60-140 60-140 60-140 <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 /> .SE UOIA 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 it <br /> i 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 **NIS=Matrix Spike, MSD=MS Duplicate RPD=Relative%Difference 9605154 PPP <1> <br />