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Chesapeake Drive Redwood Cly CA# (650!364-9600 FAX(650}364-9233 <br /> ` . u Sequoia N Wiget Lane Walnut Creek CA 983 (925►988 9600 FAX(9251 988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(9161 921-0 100 <br /> 455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(7071 792-034Z <br /> Analytical ',551 Industrial Road San Carlos CA 94070 411 1 (6501 232 9600 FAX(6501 232-9612 <br /> Sor Client Project ID Arco # 434, Lodi <br /> 9912 Business Park Dr, Ste 100 Matrix Solid <br /> Sacramento, CA 95827 <br /> Attention Rusty Benkosky QC Sample Group 9061819-824 Reported Jun 24, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Lead <br /> Benzene <br /> QC Batch# SP062399 SP062399 SP062399 SP062399 ME0623999 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 305OMDB <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 7420 <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 /> M S/MSD # 9061819 9061819 9061819 9061819 9061819 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 6/23/99 6/23/99 6/23/99 6/23/99 6/23/99 <br /> Analyzed Date 6/23/99 6/23/99 6/23/99 6/23/99 6/24/99 <br /> Instrument I D # HP-4 HP-4 HP 4 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 080 067 070 23 50 <br /> MS % Recovery 100 84 88 96 100 <br /> Dup Result 078 066 069 23 44 <br /> &D %Recov 98 83 86 96 88 <br /> RPD 25 15 14 00 13 <br /> RPD Limit 0-20 0-20 020 0-20 0-20 <br /> LCS # 4LCS062399 4LCS062399 4LCS062399 4LCS062399 LCS062399 <br /> Prepared Date 6/23/99 6/23/99 6/23/99 6/23/99 6/23/99 <br /> Analyzed Date 6/23/99 6/23/99 6/23/99 6/23/99 6/24/99 <br /> Instrument I D # HP-4 HP-4 HP 4 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 /> LCS Result 069 059 062 21 48 <br /> LCS % Recov 86 74 78 88 96 <br /> LCS 50-150 50-150 50-150 50-150 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 /> `1�� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> kL[.-Q414 lI 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 /> 9061819 SSS <3> <br />