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4T) Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 1%W Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Fugro West, Inc Client Project 10 Shell, 2575 Country Club Blvd , Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Soil <br /> Roseville, CA 95678 <br /> Attention Craig Robertson QC Sample Goup 4120384-387 Reported Dec 22, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch#- LCS12-2094 LCS122094 LCS122094 LCS122094 <br /> Date Prepared 12/20/94 12/20/94 12/20/94 12/20/94 <br /> Date Analyzed 12/20/94 12/20/94 12/20/94 12/20/94 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br />. Recovery 80 80 85 82 <br /> Control Limits. 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #- BLK122094 BLK122094 BLK122094 BLK122094 <br /> Date Prepared* 12/20/94 12/20/94 12/20/94 12/20/94 <br /> Date Analyzed 12/20/94 12/20/94 12/20/94 12/20/94 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 75 75 85 78 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 85 85 90 92 <br /> Relative% <br /> Difference 12 12 57 16 <br /> SEQUOIA ANALYTICAL Please Note <br /> . The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> 9 preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> Jr �- validation of sample batch results Due to matrix effects,the QC limits for MS/MSCs are advisory only <br /> Linda C S hnefderJrCr I and are not used to accept or reject batch results <br /> Project Manager <br /> 4120384 FUG <2> <br />