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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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX OW 921 woo <br /> V <br /> Cambria Environmental' Client Project ID Shell 2525 Country Club, Stockton <br /> 270 Perkins Avenue Matrix Liquid <br /> Sonoma, CA 95475 F <br /> < Attention Joe Neely Work Order# 9711157 -01, 02 A Reported Nov 14, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC111097BTEX21A GC111097BTEX21A GC111097BTEX21A GC111097BTEX21A GC111097BTEX21A <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: A.Miraftab A.Miraftab A.Miraftab A.Miraftab A.Miraftab <br /> MS/MSD #: 971014813 971014813 971014813 971014813 971014813 <br /> Sample Conc: N D N D N D N D N D <br /> Prepared Date: 11/10/97 11/10/97 11/10/97 11/10/97 11/10/97 <br /> Analyzed Date. 11/10/97 11/10/97 11/10/97 11/10/97 11/10/97 <br /> Instrument I.D #. GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10ug/L laftg/L 10Ng/L 30ug/L 60ug/L <br /> Result. 88 86 86 25 51 <br /> MS % Recovery: 88 86 86 83 85 <br /> Dup. Result: 87 85 85 25 50 <br /> MSD % Recov.. 87 85 85 83 83 <br /> RPD 11 12 12 00 20 <br />.RPD.LImit..0-25- 0-250-25-- - 0-25_ 0-25___ <br /> LCS #: BLK111097 BLK111097 BLK111097 BLK111097 BLK111097 <br /> Prepared Date. 11/10/97 11/10/97 11/10/97 11/10/97 11/10/97 <br /> Analyzed Date 11/10/97 11/10/97 11/10/97 11/10/97 11/10/97 <br /> Instrument LD # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 82 80 80 24 49 <br /> LCS % Recov. 62 80 80 80 82 <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 Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents <br /> SEQUOIA LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sampl <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 /> regory <br /> Project Manager **NES=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9711157 GCC <1> <br />