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Sequoia 680 Chesapeake Drive Redwood Clty 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(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 1971 N Main Manteca <br /> 114465th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803J59 91 Reported Apr 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xyienes Gas <br /> Benzene <br /> QC Batch# GC040198BTEXEXA GCO40198BTEXEXA GCM198BTEXEXA GCO40198BTEXEXA GCO40198BTEXEXA <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 9803J5705 <br /> Sample Conc N D ND ND ND 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 so 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 # 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 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 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 /> �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 due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Richard Herling <br /> Project Manager **MS=Matnx Spike,MSD=MS Duplicate,RPD=relative%Difference 9803J59 CCC <3> <br />