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Sequoia 680 Chesapeake Drive Redwood CiM 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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-%W FAX(916)921-0 100 <br /> Cambria Client project ID Shell 2575 Country Club Blvd <br /> 270 Perkins Avenue Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9712C80 -01-08 Reported Jan 6, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC122297BTEXEXB GC122287BTEXEXB GC122297BTEXEXB GC122297BTEXEXB GC122297BTEXEXB <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 971206304 9712C6304 9712C6304 9712C6304 9712C6304 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 12/22/97 12/22/97 12/22/97 12/22/97 12/22/97 <br /> Analyzed Date: 12/23/97 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GGHP1 GCHP1 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 018 0 0* 00* 0 0* Do* <br /> MS % Recovery. 90 00 00 00 00 <br /> Dup Result: 018 018 018 055 12 <br /> MSD % Recod. 90 90 90 92 100 <br /> RPD 00 200* 200* 200* 200* <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> *Matnx interference <br /> LCS#- BLK122297 BLK199297 BLK12-297 BLK122297 BLK122297 <br /> Prepared Date 12/22/97 12/22/97 12/22/97 12/22/97 12/22/97 <br /> Analyzed Date 12/23/97 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Instrument I.D #. GCHP1 GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc. Spiked: 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 12 mg/Kg <br /> LCS Result 020 020 020 060 12 <br /> LCS % Recov 100 100 100 100 100 <br /> 60.140 60-140 6D-140 60-140 60-140 <br /> LCS 70.130 7D-130 70-130 70-130 70-130 <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 /> 0 WrojectManager <br /> AL ICAL 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 /> **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9712080 CCC <1> <br /> - a _ - - <br />