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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget 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 /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232 96116 <br /> Secor Client Project ib Arco #4932 Stockton <br /> 9912 Business Park Dr, Suite #100 Matrix Solid <br /> Sacramento, CA95827 <br /> Attention Rusty Benkosky QC Sample Group 9052303-318 Reported Jun 8, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes MTBE MTBE <br /> Benzene <br /> QC Batch# SP052899 SP052899 SP052899 SP052899 9050123 9060015 <br /> 8020EXA 8020EXA 8020EXA 8020EXA - - <br /> Analy Method .- EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 EPA 8260 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030B EPA 50306 <br /> Analyst --D Newcomb D Newcomb D Newcomb D Newcomb San Carlos San Carlos <br /> MS/MSD # 9052315 9052315 9052315 9052315 L905513-01 L906018-07 <br /> Sample Conc N D N D N D N D N D N D <br /> Prepared Date 5/28/99 5/28/99 5/28/99 5/28/99 5/27/99 6/3/99 <br /> Analyzed Date 5/28/99 5/28/99 5/28/99 5/28/99 5/27/99 6/3/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 - - <br /> Conc Spiked 080 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 2500 pg/Kg 2500pg/Kg <br /> Result 079 068 074 25 2,600 2,800 <br /> MS %Recovery 99 85 93 104 104 112 <br /> Dup Result 081 070 073 24 2500 2,700 <br /> MSD % Recov 101 88 91 100 100 108 <br /> 10 - <br /> RPD 25 29 14 41 39 36 <br /> RPD Limit 0-20 0-20 0-20 0-20 025 0-25 <br /> LCS # 4LCS052899 4LCS052899 4LCS052899 4LCS052899 LCS052799 LCS060399 <br /> Prepared Date ---- 5/28/99 5/28/99 5/28/99 5/28/99 5/27/99 6/3/99 <br /> Analyzed Date 5/28/99 5/28/99 5/28/99 5/28/99 5/27/99 6/3/09 _ <br /> Instrument I D # HP4 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 2500 ug/Kg _ _2500 lig/Kg <br /> LCS Result 087 074 076 26 2,6W 3,000 <br /> LCS % Recov. 109 93 95 108 104 120 w <br /> ` LCS 50-150 50-150 50-150 50-150 70-130 70-130 <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 matr., spike does not fall within specitieu cort of emits due to matri/ <br /> 1 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 /> 9052303 SSS <23> <br />