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SEQUOI1Z <br /> A ANALYTICAL <br /> ' � 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> J*RM-West Cilent Project I D #157201/Catellus, Stockton <br /> 1777 Botelho Dr, Ste 260 <br /> Walnut Creek, CA 94596 <br /> Attention Bruce Pfaff QC Sample Group 3030201-211 Reported Mar 17, 1993 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> ' Method 8015/8020 8015/8020 8015/8020 9015/8020 EPAW15 <br /> Analyst JF JF J F JF K Wimer <br /> Reporting Units ug/L us/L ug/L ug/L ug/L <br /> ' Date Analyzed Mar 8, 1993 Mar 8, 1993 Mar 8, 1993 Mar 8, 1993 Mar 15, 1993 <br /> OC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc.. N D N D N D N D N D <br /> Spike Conc. <br /> Added. 20 20 20 60 300 <br />' Conc. Matrix <br /> Spike: 20 20 20 63 271 <br />' Matrix Spike <br /> % Recovery: 100 100 100 105 90 <br /> Conc. Matrix <br /> Spike Dup . 20 20 20 64 298 <br /> Matrix Spike <br /> Duplicate <br />' %Recovery* 100 100 100 107 99 <br /> Relative <br />' %Difference* 00 00 00 116 95 <br />' Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> EOUOIA/ANALYTICAL 96 Recovery Conc of M S -Conc of Sample x 100 <br /> Sp+ke Conc Added <br /> G� <br /> Relative%Difference Conc of M S -Conc of MSD x 100 <br /> Kenneth K F Lee (Cane of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 3030201 ERM <4> <br />