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COLUMBIA ANALYTICAL SERVICES, INC. <br /> Analytical 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 /> 13TEX and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LUFT Method <br /> ug/L (ppb) <br /> Sample Name: MW-13 Method Blank <br /> Date Analyzed: 03/05/9311 03/05/93 <br /> Ana4ye MRL <br /> Benzene 0.5 460, ND <br /> Toluene 0.5 110. ND <br /> Ethylbenzene 0.5 <20. °° ND <br /> Total Xylanos 0.5 110. ND <br /> TPH es Gg:solino 50 61600. ND <br /> TPH Total Petroleum Hydrocarbons <br /> MRL Method Reporting Limit <br /> ND None Detected at or above the method reporting limit <br /> a This sample was part of the analytical batch started on March 5, 1993. However, it was <br /> analyzed after midnight so the actual date analyzed is March 6, 1993. <br /> Raised MRL due to matrix interference. <br /> Approved by: Date: 1Q'Z2,!e2;, <br /> 3 <br /> 1921 Ringwood Avenue 9 Son Jose. California 951131 a Telephone 408/437-2400 • fox 4081437.9356 <br />