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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received: 02/24/93 <br /> . Project: Teichert Construction/OF90-002.03 Service Request No.: SJ93-0262 <br /> Sample Matrix: Water <br /> Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> pg/L (ppb) <br /> Sample Name: MW-1 <br /> Date Analyzed: 03/05/93 <br /> Pewcent Recovevy <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> Anatvt_q Neve Result MS DMSMS DMS Criteria <br /> Benzeno 1,000. 458. 1,330. 1,380. 87. 92. 39-150 <br /> Toluene 1,000. 113. 1,070. 1,080. 96. 97. 46-148 <br /> Ethylbenzono 1,000. <20. 1,030. 1,030. 103. 103. 32-160 <br /> Approved by: Date: za <br /> 1911 Ringwood Avenue • San Jose, California 951 6 • Telephone 408/437.2400 • Fax 4081407-9356 <br />