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680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Sequoia 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)232-966 <br /> Secor Client Project]b Arco #4932 Stockton <br /> 9912 Business Park Dr, Suite #100 Matrix Solid <br /> Sacramento, Ca 95827 <br /> Attention Rusty Benkosky QC Sample Group 9052421-423 Reported Jun 2, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Lead <br /> Benzene <br /> QC Batch# SP060199 SP060199 SP060199 SP060199 ME060199 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 3050MDA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 7421 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3050 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb T Le <br /> MS/MSD # 9060001 9060001 9060001 9060001 9052178 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 6/1/99 6/1/99 6/1/99 6/1/99 6/1/99 <br /> Analyzed Date 6/1/99 6/1/99 6/1/99 6/1/99 6/1/99 <br /> Instrument I D # HP-4 HP-4 HP4 HP-4 MV-1 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 50 mg/Kg <br /> Result 093 078 083 27 53 <br /> MS % Recovery 116 98 104 113 106 <br /> Dup Result 093 079 082 27 55 • <br /> MSD % Recov 116 99 103 113 110 <br /> RPD 00 13 12 00 37 <br /> RPD Limit 020 0-20 0-20 0-20 0-20 <br /> LCS # 4LCS060199 4LCS060199 4LCS060199 4LCS060199 LOS060199 <br /> Prepared Date _ 6/1/99 6/1/99 6/1/99 6/1/99 6/1/99 <br /> Analyzed Date 6/1/99 6/1/99 6/1/99 6/1/99 6/1/99 <br /> Instrument I D # --- HPA HP-4 HP-4 HP-4 MV-1 w <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 50 mg/Kg <br /> LCS Result 091 076 079 26 51 <br /> LCS % Recov 114 95 99 108 102 <br /> LCS 50-150 50150 50-150 50150 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 simples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected 10 the entire analytical procedure If <br /> 'he recovery of analytes from the matrix spike does not tall within specified control limits aue to matri„ <br /> interterence,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 /> 9052421 SSS <3> <br />