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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> Qap realian Engineering, Inc Client Project ID U6ocal,+5606 Pacific Ave, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kapreallan, P E GIC Sample Group 2100027-30 Reported Oct 12, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Tnchloro- Chloro- <br /> 1,1-Dichloroethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 5010 <br /> Analyst K Nill K Nill K Nili <br /> Reporting Units u9/L Ng/L ug/L <br /> Date Analyzed Oct 8, 1992 Oct 8, 1992 Oct 8, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone. N D N D N D <br /> • Spike Coric <br /> Added: 10 10 10 <br /> Cone. Matrix <br /> Spike: 11 11 84 <br /> Matrix Spike <br /> % Recovery: 110 110 84 <br /> Cone. Matrix <br /> Spike Dup.. 11 11 87 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 110 110 87 <br /> Relative <br /> % Difference- 00 00 35 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been reset <br /> Laboratory Blank contained the following analytes None detected _ <br /> &EQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Cone of MS -Gone of M S D x 100 <br /> $COtt A leffo (Cont of M S + Cone of M S D)/2 <br /> Project Manager 2100027 KEI <7> <br />