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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)986-9673 <br /> X117 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 /> Gettler Ryan/Geostrategies Client Protect ID Former Unocal #5421 <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804A07 -01-07 Reported Apr 22, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC041698STEXEXA GC041698BTEXEXA GC041698BTEXEXA GC041698BTEXEXA GC041698BTEXEXA <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# 980482601 980482601 980482601 980482601 980482601 <br /> Sample Cone. ND N D ND N D ND <br /> Prepared Date- 4/16/98 4/16/98 4/16/98 4/16/98 4/16/98 <br /> Analyzed Date 4/16/98 4/16/98 4/16/98 4/16/98 4/16/98 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 018 018 018 0 54 1 1 <br /> MS % Recovery 90 90 90 90 92 <br /> • Dup Result 024 025 025 073 15 <br /> MSD % Recov 120 125 125 122 125 <br /> RPD 29 33 33 30 31 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK041698 BLK041698 BLK041698 BLK041698 BLK041698 <br /> Prepared Date. 4/15/98 4/16/98 4/16/98 4/16/98 4/16/98 <br /> Analyzed Date 4/16/98 4/16/98 4/16/98 4/16/98 4/16/98 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked. 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 022 023 023 066 14 <br /> LCS % Recov 110 115 115 110 117 <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,interferent4ree matrix that is analyzed using the same reagents, <br />�SEQUDI"INA LYTICAL 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 /> W, egorynager **MS=Matrix Spike, MSD MS Duplicate,RPD Relative%Difference 9804A07 GET a 1> <br /> A <br />