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' Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1V,+ 404 N Wiget lane Walnut Creek CA 94598 (510) 988 96W FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Smith Environmental Client Project ID Culckstop 132, 94-273-94-10 <br /> 441 N Whisman, Bldg 23 Matrix Liquid <br /> t Mountain View, CA 94043 <br /> Attention Rich Garlow Work Order# 9503383 01-04 Reported Mar 18, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC031196BTEX20A GC031196BTIX20A GC031196BTEX20A GC031196BTEX20A <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# 960318008 960318008 960318008 960318008 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 3/11/96 3/11/96 3/11/96 3/11/96 <br /> Analyzed Date 3/11/96 3/11/96 3/11/96 3/11/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br />' Cone Spiked long/L 10ug/L 10ug/L 30ug/L <br /> Result 10 10 10 30 <br /> MS % Recovery 100 100 100 100 <br /> Dup Result 10 11 10 30 <br /> MSD % Recov 100 110 100 100 <br /> RPD 00 95 00 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # BLK031196 BLK031196 BLK031196 BLK031196 <br />' Prepared Date 3/11/96 3/11/96 3/11/96 3/11/96 <br /> Analyzed Date 3/11/96 3/11/96 3/11/96 3/11/96 <br /> Instrument 11.11)# GCHP20 GCHP20 GCHP20 GCHP20 <br /> Cone Spiked. 10ug/L 10ug/L 10ug/L 30ug/L <br /> LCS Result: 10 10 10 31 <br />' LCS %Recov .. 100 100 100 103 <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 /> S7Ankaitis <br /> AL 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 /> Vinterference,the LCS recovery is to be used to validate the batch <br />' Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9603383 SSS <2> <br />