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� SEQUOIA ANALYTICAL <br />' 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686 9600 FAX (510) 686-9689 <br /> e1 -West (Walnut Creek) Client Project ID #157204 <br /> 7�7 Botelho Dr Suite 260 <br /> ut Creek CA 94596 <br /> ttention Bruce Pfasf OC Sample Group 2040108-113 Reported Apr 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> NALYTE Ethyl- Organic <br /> Benzene Toluene Benzene Xylenes Diesel Lead 77 Lead <br /> EPA EPA EPA EPA <br />' Method 8015/8020 8015/8020 8015/8020 8015/8020 EPAS015 LUFT EPA 7421 <br /> Analyst K E K E K E K E A.Tuzon K Anderson D 8 <br /> Reporting Units ug/L ug/L ug/L ug/L mg/L mg/L mg/L <br /> Date Analyzed Apr 14 1992 Apr 14 1992 Apr 14 1992 Apr 14 1992 Apr 16, 1992 Apr 14 1992 Apr 21 1992 <br />' OC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank 204-0108 204-0109 <br />'Sample Conc. N D N D N D N D N D N D N D <br /> pike Conc <br /> Added: 20 20 20 60 300 25 010 <br />' Conc. Matrix <br /> Spike- 22 21 21 61 220 27 012 <br />' Matrix Spike 74 108 120 <br /> % Recovery 110 105 105 102 <br /> Conc. Matrix 260 26 Oil <br /> Spike Dup . 23 22 21 63 <br />' Matrix Spike <br /> Duplicate <br /> % Recovery 115 110 105 105 86 104 106 <br /> Relative 12 <br /> % Difference 00 <br /> 0 0 0 0 0 0 15 3 8 <br /> 1 <br /> V1Q1U0IA ANALYTICAL %Rcoevery nc of M nc of Sample pike nc Added <br /> 4aeUame Deference Conc of M S -Conc of M S D x 100 <br /> Kenneth K F Leenc of M + Gone or M /2 2 108 a8� <br /> Laboratory Manager <br />