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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 1 1 404 N Wiget Lane Walnut Creck CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(915)921 0100 <br /> Ground Zero Analysis, Inc Client Project ID 96-163, Knowles Roek <br /> 1714 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention Greg Stahl Work Order# 9803103 -01-02 Reported Apr 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GC032998BTEX02A GC032998BTEX02A GGD32998BTEX02A GCO32998BTEX02A GC032998BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C De Martini C DeMartlni C DeMartini C DeMartim C DeMartim <br /> MS/MSD# 9803H3204 98031-13204 9803H3204 9803H3204 96031-13204 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 3/29/98 3/29/98 3/29/98 3/29/98 3/29/98 <br /> Analyzed Date 3/29/98 3,'29/98 3/29/98 3/29/98 3/29/98 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 fig/L 10Ng/L 0 pg/L 30 jig/L 60 erg/L <br /> Result 10 10 10 31 63 <br /> MS %Recovery 100 100 100 103 105 <br /> Dup Result 10 10 10 31 63 <br /> j MSD % Recov 100 100 100 103 105 <br /> RPD 00 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK032998 BLK032998 BLK032998 BLK032998 BLK032998 <br /> Prepared Date 3/29/98 3/29/98 3/29/98 3/29/98 3/29/98 <br /> Analyzed Date 3/29/98 3/29/98 3/29/98 3/29/98 3/29/98 <br /> l Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 erg/L 10 erg/L 10 ug/L 30 Ng/L 60 erg/L <br /> LCS Result 96 94 97 29 59 <br /> LCS% Recov 96 94 97 97 98 <br /> MSJMW 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70130 '0-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents <br /> Q Ifi ANALYTICAL preparation and analytical methods employed forthe samples The matrix spike 1s 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 /> egg Penner <br /> of et Manager **MS=Matrix Spike MSD=MS Duplicate, RPD=Relative%Difference 9803103 GGG <1> <br /> 3 <br />