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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> rr4 yr}4}v }u re r+.v ryn4 nr, vn4 pvr nn-n O+rY 44 n+v. r vnr yr rnr n ,. n vV, v rir ` + ♦ <br /> "prealiarEnglnee�fng, Inc <br /> , Client Ph' ]6-600 Unoca1,+5606 Pacific Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kapreahan, P E QC Sample Group 2060126-129 Reported Jun 17, 1992 <br /> } A J } n r r{r l 3 4 .. /v .. .. . v v • ` r r { ` r 4 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst JF JF JF JF JF <br /> Reporting Units pg/L Ng/L vg/L pg/L frg/L <br /> Date Analyzed Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 <br /> Sample# 206-0126 206-0127 206-OM 206-0129 Matrix Blank <br /> Surrogate <br /> %Recovery 94 110 110 110 110 <br /> 4)EQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Scott AC leffo (Conn of M 5 + nc of M S D) 2 <br /> Project Manager <br />