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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 <br /> Analytical (516) 686 9600 FAX (516)686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX{916)921 0100 <br /> I*ugro West, Inc Client Project ID Shell, 4315 Waterloo Road, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Soli <br /> Roseville, CA 95678 <br /> Attention David L Poulsen OC Sample Gaup 4120206-209 Reported Dec 9, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Organic <br />' Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 LUFT <br />' Analyst C Chapman C Chapman C Chapman C Chapman D Ballard <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg o 50 mg/kg <br /> LCS Batch# LCS120894 LCS120894 LCS120894 LCS120894 LCS121294 <br /> Date Prepared 12/8/94 12/8/94 12/8/94 12/8/94 12/12/94 <br /> Date Analyzed 12/8/94 12/8/94 12/8/94 12/8/94 12/12/94 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP 1 GCHP-1 SH-1000 <br /> LCS <br /> Recovery .os 100 los las sa <br /> Control L:mats 75-125 75-125 75-125 75-125 80-120 <br />' MS/MSD <br /> Batch # BLK120894 BLK120894 BLK120894 BLK120894 4120232 <br /> Date Prepared 12/8/94 12/8/94 12/8/94 12/8/94 12/12/94 <br />' Date Analyzed 12/8/94 12/8/94 12/8/94 12/8/94 12/12/94 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 SH-1000 <br />' Matrix Spike <br /> % Recovery 100 100 100 107 86 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery 110 105 105 110 83 <br /> Relative% <br /> Difference 95 49 4 9 29 36 <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 /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> C_G ✓�!� SCC��' validation of sample batch results Due to matrix effects the OC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 1 4120206 FUG <9> <br />