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KE <br /> DO <br /> rZoi <br /> C <br /> ;i,Enseco <br /> A C~9 CwP+nY <br /> *_. <br /> I Sample Description <br /> See the attached Sample Description Information. <br /> +� The samples were received under chain-of-custody. <br /> II Anal sis u stst <br /> The fallowing analytical tests, were requested. <br /> ab nal��is OesULJ2. 0 <br /> 557007-I tfiru 3 Total Petroleum Hydrocarbons <br /> Total Petroleum hydrocarbons (Gasoline) and BTEx <br /> y III ualit Cont 1 <br /> ! , A. ro eco Specific C. No project specific QC (i.e., spikes and/or <br /> t duplicates) was requested. <br /> B. 11 <br /> ethad Blank Results. A method blank is a laboratory ge��r"ated <br /> '' sample which assesses the degree to which laboratory opez.tions !1 <br /> and rocedures cause false-positive analytical results for your <br /> same es. <br /> ` .. p arameters were detected in the method blanks associated i <br /> h Na tarp,t p <br /> with your samples at the reporting limit levels Hated on the <br /> �.a <br /> Method Blank Report. t <br /> C. Laborator Control Sam les - The LCS Prc`ram <br /> atrix <br /> Du licafie Control Sam lite) whirhDCS sis spikeda well hwithtcertainmtarget <br /> (blank water, sand o� ) <br /> zed at roximately 10% of the sample load in <br /> CS <br /> parameters and analy pp <br /> order to establish method-specifi�esaareJonlthe tattachedDDuplicate � <br /> is results associated y <br /> f:A Control Sample Report. t <br /> Accuracy is measured by Percent Recovery as n: <br /> Ea d cx 106 <br /> Pecovery s measuredtratio <br /> (actual concentration) s <br /> du licate tests by Relative Percent Difference P <br /> Fx Precision is measured using P <br /> (RPD) as in: <br /> RPD <br /> recover test I - / recover test 2)/2 x 100 <br /> �$ (% recovery test 1 + % recovery <br /> F, <br /> t.� <br />