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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N 4V1get Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 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 /> t 551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> rcor Client project ID Arco # 4932, Stockton <br /> 9912 Business Park Dr Ste 100 Matrix Solid <br /> Sacramento, CA 95827 <br /> Attention Rusty Benkosky QC Sample Group 9060251-256 Reported Jun 28, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP060799 SP060799 SP060799 SP060799 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <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 # 9060161 9060161 9060161 9060161 <br /> Sample Conc N D NO N D N D <br /> Prepared Date 6/7/99 6/7/99 6/7/99 6/7/99 <br /> Analyzed Date 6/7/99 6/7/99 6/7/99 6/7/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg <br /> Result 083 072 077 26 <br /> MS % Recovery 104 90 96 108 <br /> Dup Result 85 072 077 26 <br /> D % Recov 106 90 96 108 <br /> RPD 24 00 00 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # 4LCS060799 4LCS060799 4LCS060799 4LCS060799 <br /> Prepared Date 6/7/99 6/7/99 6/7/99 6/7/99 <br /> Analyzed Date 6/7/99 6/7/99 6/7/99 6/7/x9 <br /> Instrument I.D.# HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg <br /> LCS Result 090 075 077 26 <br /> LCS %Recov 113 94 96 108 <br /> LCS 50-150 50-150 50-150 50-150 <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 tall vr,thin spocifieo control limits due to rnatrix <br /> �t interference,the LCS recovery is to be used to validate the batch <br /> Dimple Sharma **MS=Matrix Spike,MSD=MS Duplicate RPD=Relative%Difference <br /> Project Manager <br /> ,p 9060251 SSS <9> <br />