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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> ' ------------------ <br /> Waterwork Client Project ID. W0599, Gaut Property <br /> E 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention• John Lane QC Sample Group 2033089-91 Reported: Mar 20 1992 <br /> ' J <br /> � y , <br /> tQUALITY CONTROL DATA REPORT <br /> ANALYTE M* <br /> ' Benzene Toluene benzene X enes <br /> ' Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. L Laikhtman L La+khtman L Lalkhtman L Lalkhtman <br /> Reporting Units- mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Mar 19, 1992 Mar 19, 1992 Mar 19, 1992 Mar 19, 1992 <br /> ' QC Sample#: BLK031992 BLK031992 BLK031992 BLK031992 <br /> Sample Conc.: N D. N.D N D N D <br /> Spike Cone. <br /> ' Added: 020 020 020 060 <br /> Cone. Matrix <br /> ' Spike: . 019 0.19 019 058 <br /> ' Matrix Spike <br /> %Recovery: 95 95 95 97 <br /> ' Conc. Matrix <br /> Spike Dup.: 021 020 020 063 <br /> ' Matrix Spike <br /> Duplicate <br /> %Recovery: 105 100 100 105 <br /> ' Relative <br /> %Difference: 18 51 51 83 <br /> i <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br />' pj=tManager <br /> (Conc of M S + Conc of M S D 2 <br /> 2o33oe9 war <2, <br />