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Surrogates : <br /> Surrogates were included in all samples. Surrogates are used to monitor <br /> extractions recovery efficiency. <br /> % EPA Allowable Recovery <br /> Compounds Water Soil <br /> 112-Dichloroethane-d4 76 - 114 70 - 121 <br /> Toluene-d8 88 - 110 81 - 117 <br /> 4-Bromofluorobenzene 86 - 115 74 - 121 <br /> Matrix Spikes : <br /> Matrix spikes are additional quality assurance controls. Known amounts of <br /> selected compounds are added to samples and analytical accuracy is <br /> determined by sample analysis. <br /> % EPA Allowable Recovery <br /> Matrix Spike Compounds Water Soil <br /> 1,1-Dichloroethane 61 - 145 59 - 172 <br /> Trichloroethene 71 - 120 62 - 137 <br /> Chlorobenzene 75 - 130 60 - 133 <br /> Toluene 76 - 125 59 - 139 <br /> Benzene 76 - 127 66 - 142 <br /> r <br /> CHEMWEST ANALYTICAL LABORATORIES,INC. <br />