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a _ <br /> Engineers TFH GAS & BTEX <br /> Pianneis 29851 <br /> Ecanomis;s page 2 <br /> Scientists , <br /> II. EXTRACTION <br /> A. Holding Times: Holding times were met. Due to the level of <br /> target analytes in samples 29851-1 {SB-DIS-3-60) , <br /> 29$51-2 (SB-DiS-3-66.5), 29851-3 (SB-DIS-3-71.5} , <br /> and 29851-9 (SB-DIS-3-76) , medium level protocol <br /> was performed for the BTEX analysis of these <br /> samples. <br /> Extraction <br /> B. Exceptions None encountered. <br /> r <br /> rzl. ANALYSIS <br /> ' A. Holding Times: Holding times were met. <br /> i <br /> Analytical <br /> B. Exceptions Due to the concentration of target analytes in }� <br /> . samples 29851-1 (SB-DIS-3-60) , 29851-2 (SB--DIS-3- <br /> 66.5) , 29851-3 (SB-DIS-3-71.5) , and 29651-9..(SB- <br /> DIS-3-76) , these samples were analyzed on a <br /> diluted basis to obtain detector responses within -� <br /> the linear calibration range of the instrument. <br /> The BTEX analysis of sanmple 29851-15 (SB-DIS-3- <br /> 51.5) was also analyzed on a diluted basis due to <br /> target analytes. Reporting limits have been <br /> adjusted accordingly. <br /> f <br /> i< <br /> iV. QUALITY CONTROL <br /> A. Method Blank The method blanks associated with these samples <br /> > met QC criteria. + <br /> Surrogate <br /> B. Recoveries percent recoveries for the soil extraction <br /> • surrogate standard 1,4-Difluorobanzene could not <br /> be determined for samples 29851-1 (SB-DIS-3-60) , <br /> e determine <br /> (SB-DI5-3-66.5) , 29851.-3 (SB-DIS-3-71.5) , <br /> and 29851-9 (SB-DIS-3-76) due to the required <br /> - dilutions. <br /> .... - - Matrix .. <br /> C. Spike Results: Not applicable. <br /> jasZ9 <br /> 9l 6.244.5227 <br /> CH2M HU Redding 9uotity Anolyticat Laboratodes i <br /> 5+74 Caterpiilar Road.Redding,California 960D3 �� <br />