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i <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Pctaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX <br /> '•� (707)792-0342 <br /> www.srquoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <br /> Anions by EPA Method 300.0-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4060246-General Preparation <br /> Blank 4060246-BLK1 Prepared&Analyzed:06/09/04 <br /> Nitrate as NO3 ND 890 ug/1 <br /> Sulfate as SO4 ND 1000 " <br /> Laboratory Control Sam le 4060246-BSI Prepared&Analyzed:06/09/04 <br /> Nitrate as NO3 46000 890 ug/l 44300 104 90-110 <br /> Sulfate as SO4 10600 1000 10000 106 90-110 <br /> Matrix Spike 4060.246-MSI source:P406178-10 Pr ared&Analyzed:06/09/04 <br /> Nitrate as NO3 54000 1800 ug/1 44300 7500 105 80-120 <br /> Sulfate as SO4 55400 2000 10000 45000 104 80-120 <br /> Matrix Spike Du 4060246-MSD1 Source:P406178-10 Prepared&Analyzed:06/09/04 <br /> Nitrate as NO3 54200 1800 u9/l 44300 7500 105 80-120 0.4 20 <br /> ulfate as SO4 55300 2000 10000 45000 103 80-120 0.2 20 <br /> atch 4060518-General Preparation <br /> Blank(4060518-BLKI) Prepared&Analyzed:06/23/04 - <br /> Nitrate as NO3 ND 890 11911 _•. <br /> Sulfate as SO4 ND 1000 " <br /> _ nalyzed:06/23/04 <br /> LaboratoryControl Sample(4060518-$Sl)__— Prepared&A _ <br /> Nitrate as NO3 48000 890 119/1 44300 108 90-110 <br /> Sulfate as SO4 10900 1000 10000 109 90-110 <br /> Matrix Spike(4060518-MSI) Source:P406277-01 Prepared&Analyzed:06/23/04 <br /> Nitrate as NO3 471000 18000 ug11 443000 9300 104 80-120 <br /> Sulfate as SO4 113000 20000 100000 6300 107 80-120 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise stated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> Page 34 of 37 <br />