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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> fwa� Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br />� ry <br /> Cambria Client Project ID Shell 2575 Country flub Blvd V <br /> 270 Perkins Avenue Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order # 9712726 -01-04 Reported Dec 30, 1997 4; <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#- SP1216978020EXA SP1216978020EXA SP1216978020EXA SP1216978020EXA SP1216978020EXA <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8021 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D !Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD#- 7121008 7121008 7121008 7121008 7121008 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date: 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Analyzed Date. 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Instrument I D.#- HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked. 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 6 6 mg/Kg <br /> Result 050 051 053 16 95 <br /> MS % Recovery. 63 64 66 67 144 <br /> Dup Result 049 051 052 16 93 <br /> MSD % Recov : 61 64 65 67 141 <br /> RPD 20 00 19 00 21 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS #- LCS121697 LCS121697 LCS121697 LCS121697 LCS121697 <br /> Prepared Date 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Analyzed Date- 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Instrument I.D # HP5 HP5 HP5 HP5 HP5 <br /> Conc. Spiked. 20 pg/L 20 pg/L 20 pg/L 60 pg/L 330 pg/L <br /> LCS Result 19 18 18 57 320 <br /> LCS % Recov.: 95 90 90 95 97 <br /> LCS <br /> Control Limits 50-150 50-150 50-150 50-150 60-140 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,tnterferent-free matrix that is analyzed using the same reagents, <br /> lWjectreMganrayager <br /> 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 recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> o **MS=Matrix Spike,MSR=MS Duplicate, RPD=Relative %Difference 9712726 CCC <1> <br />