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j SEQUOIA ANALYTICAL - <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Brown & Caldwell Client Project ID Arco #2133, Stockton <br /> 723 S St Method EPA 625 Q C Sample Dates <br /> Sacramento, CA 95814 Analyst(s) S Le Extracted Jan 20, 1993 <br /> Attention Steve Misner QC Sample # BLK012093 MS/MSD Analyzed Jan 25, 1993 <br /> Reported Jan 26, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Cone. Matrix Spike <br /> Cone. Spike Matrix Duplicate Relative <br /> Sample Spike Cone Matrix % Spike % % <br /> Analyte Cone Added Spike Recovery Duplicate Recovery Difference <br /> Phenol N D 100 77 77 68 68 12 <br /> 2-Chlorophenol N D 100 58 58 53 53 9 <br /> 1,4-Dichloro- N D 50 37 74 34 fib 85 <br /> benzene <br /> N-Nitroso-Di-N- N D 50 44 88 44 88 0 0 <br /> propylamine <br /> 1,2,4-Tnchloro- N D 50 36 72 33 66 8 7 <br /> benzene <br /> 4-Chloro- N D 100 82 82 73 73 12 <br /> 3-Methylphenol <br /> Acenaphthene ND 50 43 86 38 76 12 <br /> 4-Nitrophenol ND 100 34 34 30 30 13 <br /> 2,4-Dinitro- ND 50 37 74 34 68 85 <br /> toluene <br /> Pentachloro- ND 100 66 66 66 66 1 5 <br /> phenol <br /> Pyrene ND 50 62 124 57 114 8 4 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> (4WIV4 � Spike Cone Added <br /> Relative% Difference Cone of MS -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Cone of M SDI/2 <br /> Laboratory Director 3010283 BRS <9> <br />