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Sequoia 680 Chesapeake Drive Redwood CI <br /> ry CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> 404 N Wiget lane Walnut Creek,CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Environmental Tech Client Project ID Shell, 341 E Main, Ripon <br /> 114465th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Wade Work Order# 9803L68 01 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GCO439813TEXEXA GC04398BTEXEXA GC04398BTEXEXA GC04398BTEXEXA GCO4398BTEXEXA <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#: 980410102 980410102 980410102 980410102 980410102 <br /> Sample Conc N D ND ND ND ND <br /> Prepared Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Analyzed Date: 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Instrument I D# GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked. 4 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 016 017 018 052 11 <br /> *MS %Recovery 80 85 90 $7 92 <br /> Dup. Result: 017 018 018 054 11 <br /> MSD %Recov 85 90 90 90 92 <br /> RPD- 61 57 00 38 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK040398 BLK040398 BLK040398 BLK040398 BLK040398 <br /> Prepared Date: 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Analyzed Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Instrument I.D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <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 0 21 021 021 0 61 12 <br /> LCS %Recov 105 105 105 102 100 <br /> 60-140 60-140 60-140 60-140 60.140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please dote <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> EQUOIA ANALYTICAL 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 fait within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Richard Herlin9 <br /> Project Manager **MS=Matrix Spike,MSD=NIS Duplicate, RPD=Relative%Difference 9803L68 CCC 42> <br />