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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Big Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategles w Client Project IDV 28004565,-437E Miners <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> ,Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9805G16 Reported Jul 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# 06V8008 06V8008 06VB008 06V8008 06VB008 <br /> Analy Method EPA SolSM/8020 EPA 8015M/8020 EPA 8015M/8020 EPA 8015M/8020 EPA 8015M/8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. N A N A N A. N A N A <br /> LCS/LCSD# LCS053198 LCS053198 LCS053198 LCS053198 LCSN D 198 <br /> Sample Cone , N D N D N D N D <br /> Prepared Date 5/31/98 5/31/98 5/31/98 5/31/98 5/31/98 <br /> Analyzed Date 5/31/98 5/31/98 5/31/98 5/31/98 5/31/98 <br /> Instrument LD #* N A N A. N A. N A. N A <br /> Cone Spiked 20 Mg/L 20 pg/L 20 Mg/L 20 Mg/L 500kg/L <br /> Result 22 22 19 23 <br /> LCS % Recov 110 110 95 120 <br /> . Dup Result 23 22 20 22 <br /> LCSD % Recov 120 110 100 110 <br /> RPD 44 00 51 44 <br /> RPD Limit. 0-30 0-30 0-30 0-30 <br /> LCS # LCS05/31/98 <br /> Prepared Date 5/31/98 <br /> Analyzed Date. 5/31/s8 <br /> NA <br /> instrument I D # Sooug/L <br /> Cone Spiked <br /> Soo <br /> LCS Result <br /> 100 <br /> LCS % Recov <br /> LCS <br /> Control Limits 80-120 80-120 80-120 80-120 80 120 <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 /> LAP #1849 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 /> Tod Granicher <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative 96 Difference 9805G16GET <1> <br />