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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)921-0 100 <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 94070-4 11 l (650)232-9600 FAX(650)232-9612 <br /> tecor Client project Ili 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 Lead <br /> Benzene <br /> QC Batch# SP052799 SP052799 SP052799 SP052799 ME052899 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 3050MOA <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 /> MS/MSD # 9052058 9052058 9052058 9052058 9052304 <br /> Sample Conic N D N D N D N D N D <br /> Prepared Date 5/27/99 5/27/99 5/27/99 5/27/99 5/28/99 <br /> Analyzed Date 5/27/99 5/27/99 5/27/99 5/27/99 6/2/99 <br /> Instrument I D # HP4 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 084 073 080 2 7 48 <br /> MS % Recovery 105 91 100 113 96 <br /> Dup Result 090 077 080 27 46 <br /> SD %Recov 113 96 100 113 92 <br /> RPD 69 53 00 00 43 <br /> RPD Limit 0-20 0-20 0.20 0-20 0-20 <br /> t � n <br /> LCS # 4LCS052799 4LCS052799 4LCS052799 4LCS052799 LCS052899 <br /> Prepared Date 5/27/99 5/27/99 5/27/99 5/27/99 5/28/99 <br /> Analyzed Date 5/27/99 5/27/99 5/27/99 5/27/99 6/1/99 <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 089 075 076 26 49 <br /> LCS % Recov 111 94 95 108 98 <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 /> the iecovery M analytes from the matrix spike aoe-nui fall within specifier control limits due to matrix <br /> 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 <22> <br />