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Sequoia 680 Chesapeake Drive Redwood City,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 /> 4 Analytical 819 Striker Avenue Su3tc 8 Sacramento CA 95834 <br /> (9t 6) 921 9600 FAX(916)921 0100 <br /> 9 - - I <br /> Smith - Canonie Environmental Client Project ID 94-331-01, Holt Bros <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention John Lane Work Order# 9506209-01 Reported Jun 20, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO60895BTEX20A GC060895BTEX20A GCO60895BTEX20A GCO60895BTEX20A <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 Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 9505L3505 9505L3505 95051-3505 9505L3505 <br /> Sample Conc N D N D ND N D <br /> Prepared Date 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Analyzed Date 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10pg/L 10Ng/L 10ltg/L 30pg/L <br /> Result 90 91 92 28 <br /> MS % Recovery 90 91 92 93 <br /> Dup Result 92 94 96 29 <br /> MSD % Recov 92 94 96 97 <br /> RPD 22 32 43 35 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # - - <br /> Prepared Date - - - <br /> Analyzed Date <br /> Instrument I D #.-- <br /> Conc Spiked - <br /> LCS Result - <br /> LCS % Recov <br /> MS/MSD <br /> LCS 71-133 72-128 72-130 71-120 <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 /> _ 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 /> Vickie Tague Clark <br /> Project Manager **MS=Matrix Spike, MSO=MS Duplicate, RPD=Relative%Difference 9506209 CAN <2> <br />