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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364-9600 FAX(654)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 998 9600 FAX(5110)989 9673 <br /> Analytical 819 Stnker Avenue Suitc 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 oleo <br /> Brown and Caldwell Client Project ID Arco #2093, Tracy <br /> 34800 Buskirk Avenue Matrix Liquid <br /> Pleasant Hill, CA 94523 <br /> Attention Steve Misner QC Sample Group 7111386-392 Reported Dec 8, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC120197 GC120197 GC120197 GC120197 <br /> 802004A 802004A 802004A 802004A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 7111526 7111526 7111526 7111526 <br /> Sample Conc N D ND N D N D <br /> Prepared Date 12/1/97 12/1/97 12/1/97 12/1/97 <br /> Analyzed Date 12/1/97 12/1/97 12/1/97 12/1/97 <br /> Instrument I D # HP-4 HP4 HP-4 HP-4 <br /> Conc Spiked 20lig/L 20Ng/L 20yg/L 601►g/L <br /> Result 21 22 21 64 <br /> MS % Recovery 105 110 105 107 <br /> Dup Result 20 21 20 62 <br />. MSD % Recov 100 105 100 103 <br /> RPD 49 47 49 32 <br /> RPD Limit 0-20 0-20 020 0-20 <br /> LCS # 4LCS120197 4LCS120197 4LCS120197 4LCS120197 <br /> Prepared Date 12/1/97 12/1/97 12/1/97 12/1/97 <br /> Analyzed Date 12/1/97 12/1/97 12/1/97 12/1/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20Ltg/L 20ug/L sopg/L <br /> LCS Result 19 20 18 58 <br /> LCS % Recov 95 100 90 97 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 /> Q fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matnx <br /> interference the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer '*M5=Matrix Spike, MSD=MS Duplicate, RPO=Relative%Difference <br /> Client Services Representative <br /> 7111386 BRO <7> <br />