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SEQUOIA ANALYTICAL <br /> 0 ales AvenueSuite Concord California <br /> (415) 686-9600 0FAX (4i 5) 68 686 9689 <br /> Applied GeoSystems (Sacramento) Client Project ID Arco#2130-90-1/Stockton <br /> 4191 E Power Inn Rd <br /> Sacramento, CA 95826 <br /> Attention Eloise Frick OC Sample Group 1060503-509 Reported Jun 27, 1991 <br /> DUALITY CONTROL DATA REPORT <br /> i <br /> i <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA8015/8020 EPA8015/8020 EPA8015/8020 EPA6015/8020 <br /> Analyst JF/KL JF/KL JF/KL JF/KL <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Jun 25, 1991 Jun 25 1991 Jun 25, 1991 Jun 25, 1991 <br /> CC Sample # BLK062191 M SLK062191M BLK062191 M BLK062191 M <br /> Sample Conc N D N D N D N D <br /> 10 <br /> Spike Conc. <br /> Added: 040 040 040 1 2 <br /> Conc. Matrix <br /> Spike, 034 033 034 10 <br /> Matrix Spike <br /> %Recovery: 85 83 85 83 <br /> Conc Matrix <br /> Spike Dup.. 036 034 035 1 0 <br /> Matrix Spike <br /> Duplicate <br /> • Recovery" 90 85 88 83 <br /> Relative <br /> • Difference 57 30 29 0 <br /> tiality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> W <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Samole X 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> �/J lla R Malerstein (Conc of M S + Conc of M S D)/2 <br /> P olect Manager 1060603 APS <5> <br />