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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988%73 <br /> �rlu� Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Pacific Environmental Group Client Project ID 920-1191A/9-6171, Stockton <br /> 2025 Gateway Place, Suite 440 Matrix SOLID <br /> San Jose, CA 95110 <br /> Attention Tim Anensen Work Order# 9712E29 01-07 Reported Jan 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch#- GC122697BTEXEXB GC122697BTEXEX6 GC122697BTEXEXB GC122697BTEXEXB GC122697BTEXEXB <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# 9712E2904 9712E2904 9712E2904 9712E2904 9712E2904 <br /> Sample Conc. N D N D N D N D N D <br /> Prepared Date. 12/26/97 12/26/97 12/26/97 12/26/97 12/26/97 <br /> Analyzed Date: 12/29/97 12/29/97 12/29/97 12/29/97 12/29/97 <br /> Instrument LD#: GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 0 20 mg/Kg 0 20 m9/K9 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 0 080 0 070 0 080 021 050 <br />• MS % Recovery- 40 35 40 35 42 <br /> Dup Result: 017 016 016 049 11 <br /> MSD % Recov - 85 so 80 82 92 <br /> RPD: 72 78 67 80 75 <br /> RPD Limit. 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK122697 BLK122697 BLK122697 BLK122697 BLK122697 <br /> Prepared Date: 12/26/97 12/26/97 12/26/97 12/26/97 12/26/97 <br /> Analyzed Date: 12/29/97 12/29/97 12/29/97 12/29/97 12/29/97 <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 018 017 016 048 11 <br /> LCS % Recov.. 90 85 so so 92 <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 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 /> Tod Granicher <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9712E29 PPI' <1 n <br />