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` Sequoia 680 Chesapeake Dnve Redwood CityCA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> a)— 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytiea 819 Stoker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> v A " ° Client i�rn`ect iD 'Shell, 7700 Moreland Court,'Stockton, CA <br /> f;ugro West, Inc Cf e I , <br /> v 1050 Melody Lane, Ste 160 Matrix Soil <br /> Roseville, CA 95678 <br /> Attention Will Shipp CC 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 /> LCS Batch# LC8100395 LCS100395 LCS100395 LCS100395 <br /> Date Prepared 10/3/95 10/3/95 10/3/95 10/3/95 <br /> Date Analyzed. 10/3/95 10/3/95 10/3/95 10/3/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery- 105 104 105 104 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # BS100395 BS100395 BS100395 BS100395 <br /> Date Prepared 10/3/95 10/3/95 10/3/95 10/3/95 <br /> Date Analyzed: 10/3/95 10/3/95 10/3/95 10/3/95 <br /> Instrument I.D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery- 94 94 94 96 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 107 106 107 107 <br /> Relative % <br /> Difference 13 12 13 11 <br /> SEQUOIA ANALYTICAL Please dote <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 /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSG's are advisory only <br /> a C Schneider and are not used to accept or reject batch results <br /> ,7/Project Manager <br /> i i 5091345 FUG <4> <br />