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SEQUOIA ANALYTICAL " <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 ' <br /> (916) 921-9600 • FAX (916) 921 0100 <br /> Brown &Caldwell nv Cl lent Project ID Arco#2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Misner QC Sample Group 206-0235 Reported Jun 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Cadmium Chromium Copper <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units ppb ppb ppb ppb mg/L mg/L mg/L <br /> Date Analyzed Jun 18, 1992 Jun 18, 1992 Jun 18, 1992 Jun 18, 1992 Jun 15, 1992 Jun 15, 1992 Jun 15, 1992 <br /> QC Sample# 206.0234 206-0284 206.0284 206.0284 206-0235 206-0235 206-0235 <br /> Sample Conc.: N D N D N D N D N D N D 0 019 <br /> Spike Conc. <br /> Added- 10 10 10 20 10 10 100 <br /> Conc. Matrix <br /> Spike: 94 99 10 20 1 0 1 1 1 1 <br /> Matrix Spike - <br /> %Recovery: 94 99 100 100 100 110 108 <br /> Conc. Matrix <br /> Spike Dup.. 95 10 10 20 1 0 1 1 1 1 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 95 100 100 100 100 110 108 <br /> Relative <br /> %Difference 10 10 00 00 00 00 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYT CAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2060235 BCP <3> <br />