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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> NO (510) 686-9066 • FAX (510) 686 9689 <br /> 0 <br /> Alton Geoscience Client Project ID 30-140-01 <br /> 1004 Burnett St #140 <br /> Concord ,CA 94520 <br /> Attention Tridib Gruha OC Sample Group 1091912-1922 Reported Oct 14, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene EthyiBenzene Xylenes <br /> Method EPA 8415/8020 EPA 8015/8024 PA 8015/802 PA 8015/8020 <br /> Analyst R M R M R M R M <br /> Reporting Units pg/L Ng/L erg/L ug/L <br /> Date Analyzed Oct 2, 1991 Oct 2 1991 Oct 2, 1991 Oct 2 1991 <br /> OC Sample # matrix blank matrix blank matrix blank matrix blank <br /> Sample Conc N D N D N D N D <br /> (a <br /> Spike Conc <br /> Added 20 20 20 60 <br /> Conc. Matrix <br /> Spike: 20 18 19 64 <br /> Matrix Spike <br /> % Recovery 100 90 95 110 <br /> Conc. Matrix <br /> Spike Dup : 19 17 is 62 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 95 a5 90 100 <br /> Relative <br /> % Difference 51 57 54 32 <br /> 0 <br /> S IA N YTICA %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Fielative%Difference Conc of MS -Cone of M S D x 100 <br /> J R Malerstein (Conc of M S + Conc of M S D 2 <br /> P ject Manager 1091912-ALG <4> <br />