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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget 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(916)921-0100 <br /> jY 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> i <br /> Cambria Environmental Tech Client Project ID Shell 1071 N Main, Manteca <br /> 1144 65th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 98803J55 01, 04 Reported Apr 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC040198BTEXEXA GC040198BTEXEXA GCO40198BTEXEXA G0040198BTD(EXA GC040198BTEXEXA <br /> Anally 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#. 9803,15705 9803J5705 9803,15705 9803J5705 9803J5705 <br /> Sample Conc.: ND N D ND N D N D <br /> Prepared Date 4/1/98 4/1/98 4/1/98 4/1/98 4/1/98 <br /> Analyzed Date 4/1/98 4/1/98 4/1/98 4/1/98 4/1/98 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <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. 018 018 019 054 12 <br /> 4aMS % Recovery, 90 90 95 90 100 <br /> Dup. Result 019 018 019 057 12 <br /> MSD % Recov 95 90 95 95 100 <br /> RPD 54 00 00 54 00 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLKM198 BLK040198 BLK040198 BLK040198 BLK040198 <br /> Prepared Date 3/30/98 3/30/98 3/30/98 3/30/98 3/30/98 <br /> Analyzed Date 3/31/98 3/31/98 3/31/98 3/31/98 3/31/98 <br /> Instrument I D#. GCHP7 GCHP7 GCHP7 GGHP7 GCHP7 <br /> Conc Spiked 0 20 mg/K9 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 020 019 020 059 13 <br /> LCS % Recov 100 95 100 98 108 <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 LGS 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 fall within specified control limits clue to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Richard Herli <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803J55 CCC <5> <br />