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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> W' +4{+•�v... v + v +f.+ .+ v v v + + 4 + { v++ } v + rr { k+ v <br /> l <br /> �RE..}14J4 rnd <br /> SNA ustnes Client Project ID Arco#2168, Stockton <br /> 3164 Gold Camp Dr. Suite 200 <br /> Rancho Cordova, CA 95670 <br /> -Attention Eloise Cherven QC Sample Group 2050148�9r A 4 Reported May 12, 1992 <br /> 1 }r l+o+ v + v+ } I v+ x} } v v +•++} n v v++ ++ r � }�h n}} +u +} r0> <br /> 1`vrv+.N+ r n r, vv ^ my v nr r +} ' ♦} rr n� <br /> I' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed May 11, 1992 May 11, 1992 May 11, 1992 May 11, 1992 <br /> CC Sample# BLK051192 BLK051192 BLK051192 BLK051192 <br /> Sample Conc.: N D N D N D N D <br />�• Spike Conc. <br /> Added: 0 2 0 2 0 2 0 4 <br /> Conc Matrix <br /> Spike: 017 017 017 036 <br /> r <br /> Matrix Spike <br /> %Recovery- 85 85 85 90 <br /> Conc. Matrix <br /> r Spike Dup : 017 017 017 035 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 85 85 85 88 <br /> Relative <br /> %Difference: 0 0 0 0 0 0 28 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> &SEQUOIA ANALYTIC %Recovery Conc of M S -Conc of Sample x 100 <br /> 7("4j, Spike Conc Added <br /> Relative%Difference Cone of M S -Conc of M S D X100 <br /> Michael R Giles (Conc of M S + Conc of M 9—D) 2 <br /> Laboratory Director <br />• 2050148 RES 44> <br />