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Sequoia 680 Chesapeake Dr,vc Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 96W FAX(510)988 9673 <br /> NOAnalytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0rows and Caldwell Client Project ID Arco #2093, Tracy <br /> 480 Buskirk Avenue Matrix Liquid <br /> Pleasant Hill, CA 94523 <br /> Attention Steve Misner QC Sample Group 7080660-671 Reported Aug 26, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC081897 GCO81897 GCO81897 GCO81897 <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 /> ria yst D Newcomb D Newcomb D Newcomb D Newcomb <br /> M S/MSD ## 7080918 7080918 7080918 708D918 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 8/18/97 8/18/97 8/18/97 8/18/97 <br /> Analyzed Date 8/18/97 8/18/97 8/18/97 8/18/97 <br /> Instrument I D # HP4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20Ng/L 20pg/L 20pg/L 60ug/L <br /> Result 20 20 19 60 <br /> MS % Recovery 100 100 95 100 <br /> Dup Result 19 19 18 57 <br /> MSD % Recov 95 95 90 95 <br /> RPD 51 51 54 51 <br /> RPD Limit 0-20 x20 0-20 ata <br /> LCS # 4LCS081897 4LCS081897 4LCS081897 4LCS081897 <br /> Prepared Date 8/18/97 8/18/97 8/18/97 8/18/97 <br /> Analyzed Date 8/18/97 8/18/97 8/18/97 8/18/97 <br /> Instrument I D ##: HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20pg/L 20ug/L 60Erg/L <br /> LCS Result 19 19 18 57 <br /> LCS % Recov 95 95 90 95 <br /> LCS 713-130 713.130 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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure H <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> )InLrrference,the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer "MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Client Services Representative <br /> 7080660 BRO <3> <br />