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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> prealian`�rigineer�ng, lnc Client I�roject ID `k�nocal,'Sf3061�acilc Ave ,'Stockton v v v <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2060126-129 Reported Jun 17, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Tnchloro- Chloro- <br /> 1,1-Dichloroethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst M Nguyen M Nguyen M Nguyen <br /> Reporting Units pg/L pg/L pg/L <br /> Date Analyzed Jun 12, 1992 Jun 12, 1992 Jun 12, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone • N D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 <br /> Cone. Matrix <br /> Spike. 71 88 87 <br /> Matrix Spike <br /> % Recovery: 71 88 87 <br /> Cone. Matrix <br /> Spike Dup : 71 95 97 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 71 95 97 <br /> Relative <br /> % Difference: 00 77 11 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Laboratory Blank contained the following analytes None detected <br /> &QUOIA ANALYTICAL %Recovery Cane of M S -Cone of Sample x foo <br /> Spike Cone Added <br /> Relative%Difference Cone of MS -Conc. of M S D x 100 <br /> 4SCOtthieffo (Cone of M S t Cone of M S D)/2 , <br /> Project Manager <br />