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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 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />— ugro West, Inc Client Project ID Shell, 4315 Waterloo Road, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Soil <br /> Roseville, CA 95678 <br /> Attention David L Poulsen OC Sample Goup 4120210-227 Reported 12/9,12/94 <br /> QUALITY CONTROL DATA REPORT <br /> ANTXM8 Ethyl- Total <br />' Benzene Toluene Benzene Xylenes Lead <br />' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman K Barta <br /> Concentration <br /> Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br />' LCS Batch# LCS120894 LCS120894 LCS120894 LCS120894 LCS120894 <br />' Date Prepared 12/8/94 12/8/94 12/8/94 12/8/94 12/8/94 <br /> Date Analyzed 12/8/94 12/8/94 12/8/94 12/8/94 12/9/94 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 P-40 <br /> LCS <br /> Recovery 105 100 105 105 99 <br />' Control Limits 75-125 75-125 75-125 75-125 80-120 <br />' MS/MSD <br /> Batch # BLK120894 BLK120894 SLK120894 BLK120894 4120220 <br />' Date Prepared 12/8/94 12/8/94 12/8/94 12/8/94 12/8/94 <br /> Date Analyzed 12/8/94 12/8/94 12/8/94 12/8/94 72/9/94 <br /> Instrument LD # GCHP-1 GCHP 1 GCHP-1 GCHP 1 P-40 <br />' Matrix Spike <br /> % Recovery 100 100 105 107 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 105 105 110 91 <br /> Relative% <br /> Difference 95 49 00 29 6 8 <br /> SEQUOIA ANALYTICAL Please mote <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 /> PLt�nda <br /> validation of sample batch results Due to matrix effects the CC limits for MS/MSD's are advisory only <br /> C Schneider and are not used to accept or re)ect batch results <br /> Project Manager <br /> 4120210 FLAG <6> <br />