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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> Alton Geoscience Client Project iD Mobil#10-NP4/2375 Tracy Blvd <br /> ry 1000 Burnett Avenue, Suite 140 <br /> Concord, CA 94520 <br /> Attention Tridlb Guha OC Sample Group 1110081-82 Reported Nov 8, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst RH/J f= RH/JF R.H/JF RH/JF <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Nov 6, 1991 Nov 6, 1991 Nov 6, 1991 Nov 6, 1991 <br /> OC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc. N D N D N D N D <br /> Spike Conc <br /> Added- 040 040 040 12 <br /> Conc. Matrix <br /> Spike: 048 037 030 10 <br /> Matrix Spike <br /> %Recovery- 120 92 75 83 <br /> Conc. Matrix <br /> Spike Dup : 048 036 029 099 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 120 90 72 82 <br /> Relative <br /> % Difference: 0 27 34 10 <br /> Laboratory blank contained the following analytes None Detected <br /> EQUOIA AN LYTICAL %Recovery Conc of M S -Conc of Sample x too <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> a R Malerstein (Conc of M S + Conc of M S D)_12 <br /> Pr ject Manager <br /> 1110081-ALG c2> <br />