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Sequoia 680 Chesapeake Drive Redwood CiM CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 404 N eget Lane Walnut Creek CA 94598 (510) 988-9600 FAX(5l0)988 9673 <br /> Analytical a19 Striker Avenue Suite 8 Sacramento C4 95834 (916) 921 9600 FAX{916) 921 0100 <br /> f�ugroryWest, Inc u Client Project It) Shell, 7700 Moreland Court:' tockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Sod <br /> Roseville, CA 95678 <br /> Attention Will Shipp QC Sample Group 5091345-7, 49, 54-5, 58-9, 62-3 Reported Oct 9, 1995 <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 V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> I <br /> LCS Batch# LCS100495 LCS100495 LCS100495 LCS100495 <br /> Date Prepared 10/4/95 10/4/95 10/4/95 10/4/95 <br /> Date Analyzed 10/4/95 10/4/95 10/4/95 10/4/95 <br /> Instrument l D #- GCHP 1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 94 93 93 92 <br /> Control Limits- 75-125 75-125 75-125 75-125 <br /> i <br /> MS/MSD <br /> Batch # 5091586 5091586 5091586 5091586 <br /> Date Prepared. 10/4/95 10/4/95 10/4/95 10/4/95 <br /> Date Analyzed 10/4/95 10/4/95 10/4/95 10/4/95 <br /> Instrument LD # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 84 82 79 82 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 93 89 88 88 <br /> Relative% <br /> Difference 10 82 11 70 <br /> i <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known, Lnterferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Protect Manager <br /> 5091345 FUG <5> <br />