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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Development Client Project 1 <br /> 1 D Chevron #9-2033 <br /> P O Box 2554 <br /> Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 6090423-436 Reported Oct 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Lead <br /> Benzene <br /> QC Batch# SP091096 SP091096 SP091096 SP091096 ME091096 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 601OMDA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3050 <br /> Analyst D Newcomb D Newcomb b Newcomb D Newcomb J Kelly <br /> MS/MSD # 6090432 6090432 6090432 6090432 6090409 <br /> Sample Conc N D N D N D N D 5 0 mg/kg <br /> Prepared Date 9/10/96 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 9/12/96 <br /> Instrument I D # HP-4 HP 4 HP-4 HP-4 MV-3 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg 50 mg/kg <br /> Result 051 042 041 13 52 <br /> MS % Recovery 128 105 103 108 94 <br /> up Result 055 044 044 13 53 <br /> 4kpc % <br /> Recov 138 110 110 108 96 <br /> RPD 76 47 71 00 19 <br /> RPD Limit 0-25 0-25 0-25 025 0-20 <br /> LCS # 4LCS091096 4LCS091096 4LCS091096 4LCS091096 LCS091096 <br /> Prepared Date 9/10/96 9/10/96 9/10/96 9/10/96 9/10/95 <br /> Analyzed Date 9/10/96 9/10/96 9/10/96 9/10/96 9/12/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 MV-3 <br /> Conc Spiked 20pg/L 20pg/L 20pg/L 60pg/L 50 mg/kg <br /> LCS Result 24 18 18 56 50 <br /> LCS % Recov 120 90 90 93 100 <br /> LCS 60-140 60-140 60-140 60-140 80-120 <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, #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 /> interference,the LCS recovery 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 /> 6090425 TOU <6> <br />