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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> ` prealian Engineering,vinc NClient Project 16 L nocal, 5606 OF cific Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2060126-129 Reported Jun 17, 1992 n <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 5010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst MN MN MN MN MN <br /> Reporting Units pg/L pg/L ug/L ug/L pg/L <br /> Date Analyzed Jun 12, 1992 Jun 12, 1992 Jun 12, 1992 Jun 12, 1992 Jun 12, 1992 <br /> Sample# 206-0126 206-0127 206-0128 206-0129 Matrix Blank <br /> i <br /> Surrogate#1 <br /> %Recovery: 85 115 130 78 70 <br /> Surrogate#2 <br /> %Recovery: 95 93 100 108 110 <br /> 4kEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Scott A Chleffo (Cone of M S + Cone of M S D)/2 , <br /> Project Manager <br />