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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> 1916) 921-9600 9 FAX (916) 921-0100 <br /> RESNA Industries Client Project ID Arco #548 Stockton <br /> 3164 Gold Camp Dr Suite 200 <br /> Rancho Cordova CA 95670 <br /> Attention Gregg Gurss CC Samnie Group 2030095-101 Reoorted Mar 9 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Senzene Toluene Benzene Yvlenes <br /> Methoo =PA 8020 EPA 8020 EPA 8020 =°A 8020 <br /> Analyst C Chapman C Chapman C Chapman � Chapman <br /> Reporting Units rng/m3 mg/m3 mg/m3 mglm3 <br /> Date Analvzea 'tar 5 1992 Mar 5 1992 Mar 5 1992 !lar 5 1992 <br /> CC Sample # 51-1<030592 BLK030592 BLK030592 :LK030592 <br /> Sample Cone.. N D N D N D N D <br /> . Spike Cone <br /> Added- 2 2 2 4 <br /> Cone. Matrix <br /> Spike 2 1 9 1 8 34 <br /> Matrix Spike <br /> % Recovery- 100 95 90 85 <br /> Cone. Matrix <br /> Spike Dup 1 8 1 7 1 6 3 2 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 85 80 80 <br /> Relative <br /> % Difference 10 11 12 61 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL % Recovery Conc at M S Conc of Samoie x 100 <br /> Splice Conc Added <br /> Relative%Difference Conc aims Conc of M S D x 100 <br /> Michael R Giles (Conc at M S + Conc of M S D) /2 <br /> Laboratory Director <br /> 2030095 RES <4> <br />