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I COLUMBIA ANALYTICAL SERVICES, INC <br /> Analytical Report <br /> Client. EMCON Associates Date Received: 04/07/93 <br /> Project: EMCON Project No 0G71-029 01 Service Request No - SJ93-0472 <br /> ARCO Facrlrty No 2130 Sarnple Matrix: Water <br /> BTEX and TPM as Gasoline <br /> EPA Methods 5030/8020/California DHS LOFT Method <br /> Ng/L Ippb) <br /> Sample Name MW-7 (73) Method Blank Method Blank <br /> Date Analyzed 04/14/93 04/14/93 04/15/93 <br /> Analyte MRL <br /> Benzene 05 <6 ND ND <br /> Toluene 05 ND ND ND <br /> Ethylbenzene 0 5 ND ND ND <br /> Total Xylenes 05 ND ND ND <br /> TPH as Gasoline 50 ND ND ND <br /> TPH Total Petroleum Hydrocarbons <br /> MRL Method Reporting Limit <br /> ND None Detected at or above the method reporting limit <br /> Raised MRL due to matrix interference <br /> Approved by Date <br /> 4 <br />