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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> eD- 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> `5ugro West, Inc h~A + Client Project Ib Shell, 2575 Country Club Blvd , Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matnx Soil <br /> Roseville, CA 95678 ' <br /> Attention Sudhakar Talanki QC Sample Group 5050998-1014 Reported May 31, 1995 > <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst' C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch#- LCS053095 LCS063095 LCS053095 LCS053095 <br /> Date Prepared 5/30/95 5/30/95 5/30/95 5/30/95 <br /> Date Analyzed 5/30/95 5/30/95 5/30/95 5/30/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> • LCS % <br /> Recovery 93 89 95 94 <br /> Control Limits- 75-125 75-125 75-125 75-125 <br /> MS/MSO <br /> Batch # 5051552 5051552 5051552 5051552 <br /> Date Prepared. 5/30/95 5/30/95 5/30/95 5/30/95 <br /> Date Analyzed- 5/30/95 5/30/95 5/30/95 5/30/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 92 94 96 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 92 95 97 98 <br /> Relative % <br /> Difference 00 10 10 1 0 <br /> �E',EQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> i preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> ?i�f(e4l validation of sample batch results Due to matrix effects,the QC limits for MS/MSG's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Protect Manager <br /> 5050998 FUG c 5> <br />