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GROUNDWATER VALIDATION INFORMATION <br /> Calscience Work Number: 08-08-2353 <br /> Sample: TW-5, TW-51) and TW-4 <br /> Collection Date: August 26,2008 <br /> Volatile Organic Compounds in Groundwater-EPA Method 8260 <br /> Holding Times <br /> The holding time requirement is 7 days for the aqueous sample. The samples were <br /> analyzed within this holding time requirement. <br /> Method Blanks <br /> The method blank was free of contaminants. <br /> Sensitivity <br /> No dilutions were necessary. The RLs were met. <br /> Matrix Spike/Matrix Spike Duplicate,Laboratory Control Sample and Surrogate <br /> Recoveries <br /> The%recoveries for the MS,MSD,LCS,surrogates and the RPDs were within the control limits. <br /> Duplicate Samples <br /> All compounds were non-detected except for the following: <br /> Compound Sample# Result Dup. Result % REC <br /> (ug/L Sam le# u /L <br /> n-Bu lbenzene TW-5 1.7 TW-51) ND NA <br /> 1,2,4 Trimeth lbenzene TW-5 37 TW-5D 38 97 <br /> 1,3,5 Trimeth lbenzene TW-5 18 TW-51) 18 100 <br /> /m-X lene TW-5 1 13 1 TW-513 1 13 1 100 <br /> o-X lene TW-5 1 4 1 TW-513 1 3.8 95 <br /> Polynuclear Aromatic Hydrocarbons—EPA Method 8310 <br /> Holding Times <br /> Water samples have a 7-day extraction period and a 30- day analysis period for analysis. <br /> All samples were analyzed within this time period. <br /> Blanks <br /> The method blank was analyzed and was contaminate free. <br /> Sensitivity <br /> The target RLs for PAH analyses in the sample were achieved. <br /> 17 <br />