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(D Sequoia 680 Chesapeake Dnve 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 /> qui Analytical 8 t9 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 0 <br /> Touchstone Development Client Project ID Chevron #9-2033 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 6090461-464 Reported Sep 26, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP091096 SP091096 SP091096 SP091096 <br /> 8020EXB 8020EXB 8020EXB 8020EXB <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb [) Newcomb <br /> M S/MSD # 6090443 6090443 6090443 6090443 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 9/10/96 9/10/96 9/10/96 9/10/96 <br /> Analyzed Date 9/10/96 9/10/96 9/10/96 9/10/96 <br /> Instrument I D # HP-5 HP 5 HP-5 HP-5 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result 040 042 045 1 3 <br /> MS % Recovery 100 105 113 108 <br /> WDup Result 044 047 050 15 <br /> % Recov 110 118 125 125 <br /> RPD 9 5 11 11 14 <br /> RPD Limit 0 25 025 0-25 0-25 <br /> LCS # 5LCS091096 5LCS091096 5LCS091096 5LCSD91096 <br /> Prepared Date 9/10/96 9/10/96 9/10/96 9/10/96 <br /> Analyzed Date 9/10/96 9/10/96 9/10/96 9/10/96 <br /> Instrument I D # HP-5 HP-5 HP 5 HP-5 <br /> Conc Spiked 20Ng/L 20pg/L 20p9lL 60ug/L <br /> LCS Result 18 19 20 59 <br /> LCS % Recov 90 95 100 98 <br /> LCS 60-140 60-140 60140 60-140 <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 /> S OIA ANALYTICAL, #1271 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 /> terference,the LCS fecovery is to be used to validate the batch <br /> Melissa A Brewer **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Client Services Representative <br /> 6090461 TOU <2> <br />