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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: Arco Product Companv Service Request: S9501451 <br /> Project: 1775-212 001frO#17075 00/760 Lodi Date Collected: 11/15/95 <br /> Sample Matrix: Water Date Received: 11/16/95 <br /> Date Extracted: NA <br /> Date Analyzed: 11/29/95 <br /> Matrix Spike0upllcate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L(ppb) <br /> Sample Name Batch QC Sample <br /> Lab Code S9501463-002 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 25 25 ND 26 1 258 104 103 75-135 1 <br /> Toluene 25 25 ND 26 1 259 104 104 73-136 1 <br /> Ethylbenzene 25 25 ND 261 257 104 103 69-142 2 <br /> Page 9 <br />