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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 /> 4D �rlal�$1Ca 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> qQF Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)791-1865 FAX(707)79Z-0342 <br /> 'i <br /> Cambria Environmental tech Client Project ID Shell Manteca <br /> 114465th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803J57 01, 03, 05, 07, 09 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC040198BTEXEXA GC040198BTEXEXA GCO40198BTEXEXA GCO40198BTEXEXA G0040198BTEXEXA <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 # 9803J5705 9803J5705 9803J5705 9803J5705 9803,15705 <br /> Sample Conic N D ND N D N D ND <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 /> MS % Recovery 90 90 919 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 # BLK040198 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 1 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 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 LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> EQUOI VALYT"ICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> Pfortified with known quantities of specific compounds and subjected to the entire analytical procedure Efthe recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Richard He <br /> Project Manager *"MS=Matnx Spike, MSD=MS Duplicate,RPD=Relative%Difference 9803,157 CCG <2> <br />