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�� � � �w: sem ' ,.•' '. —,. �,�_ �s <br /> Sequoqu Ula 1455 McDowell Blvd,North Ste D <br /> ia 7 Petaluma,CA 94954 <br /> Analytical FAX(707)792-1865 <br /> �. (707)792-0342 <br /> . www.sequoialabs.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 /> Conventional Chemistry Parameters by APHA/EPA Methods-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 4060390-General Preparation <br /> Laboratory Control Sample(4060390-BSl) Prepared&Analyzed: 06/09/04 <br /> Orthophosphate as P 486 50 ug/l 500 97 80-120 <br /> Matrix Sp (4060390-MSI)- . Source:P406178-01 Prepared&Analyzed: 06/09/04 <br /> Orthophosphate as P 601 50 ugll 526 93 97 75-125 <br /> _M_atrix Smoke Dup(4060390-MSDI) Source:P406178-01 Prepared&„Analyzed:06/09/04 <br /> Orthophosphate as P 581 50 u9A 526 93 93 75-125 3 20 <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 /> I' <br /> Page 33 of 37 <br />