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680 Chesapeake Drive Redwood City CA 94063 (6501 364 9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)986-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92t-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-41 1 l (650)232-9600 FAX(650)232-9612 <br /> Secor Client Project Ib 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 MTBE Lead <br /> Benzene <br /> QC Batch# SP060799 SP060799 SP060799 SP060799 SP060499 ME060999 <br /> 8020EXA $020EXA 8020EXA 8020EXA 8260EXA 601OMDA <br /> Analy Method EPA 8020 EPA 8020 EPA 6020 EPA 8020 EPA 8260 EPA 6010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3050 <br /> Analyst J Minkel J Minkel J Minkel J Minkel N Nelson J Kelly <br /> MS/MSD # 9060161 9060161 9060161 9060161 9060130 T 9060252 <br /> Sample Conc N D N D N D N D N D 7 0 mg/Kg <br /> Prepared Date 6/7/99 6/7/99 6/7/99 6/7/99 6/4/99 6/9/99 <br /> Analyzed Date 6/7/99 6/7/99 6/7/99 6/7/99 6/10/99 6/11/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 GC/MS 2 MV-3 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 2 5 mg/Kg 50 mg/Kg <br /> Result 0 83 072 077 2 6 22 60 <br /> MS % Recovery 104 90 96 108 88 106 <br /> Dup Result 0 85 072 077 2 6 24 58 <br /> MSD % Recov 106 90 96 108 96 102 <br /> RPD 24 00 00 00 87 34 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-25 0-20 <br /> LCS # 4LCS060799 4LCS060799 4LCS060799 4LC8060799 LCS060799 LCSG60999 <br /> Prepared Date 6/7/99 6/7/99 6/7/99 6/7/99 6/7/99 6/9/99 <br /> Analyzed Date _ 6/9/99 6/9/99 6/9/99 6/9/99 6/9/99 _ 6/24/99 <br /> Instrument I D # HP-4 HP4 HP-4 HP-4 GC/MS 2 MV-3 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 2 5 mg/Kg 50 mg/Kg <br /> LCS Result 094 080 0 84 29 21 55 <br /> LCS °% Recov 116 100 105 119 84 110 <br /> LCS 50-150 50-150 50-150 50-150 70-130 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 It <br /> the recovery of analytes from the matrix apike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> ample Sharma *"MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager <br /> 9060251 SSS <10> <br />