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Engineers TPH GAS a BTEX <br /> Planners 29851 <br /> s Economists 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 /> 29851-2 (SB-DIS-3"66.5) , 29851-5 (SB-DIS-3-71 <br /> and 29851-9 (SB-DIS-3-76) , medium level Prot <br /> was performed for the BTEX analysis of these <br /> samples. c <br /> Extraction <br /> B. Exceptions None encountered. <br /> III. ANALYSIS 1 <br /> A. Holding. Times: Holding times were met. <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 29851-9 <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 sample 29851-^15 (SB,-DIS-3- F � <br /> 51.5) was also analyzed on a diluted basis due to <br /> target analytes. Reporting limits have been <br /> adjusted accordingly. <br /> ay. QUALITY CONTROL <br /> A. Method Blank The method blanks associated with these samples <br /> met Qc criteria, �1 <br /> Surrogate <br /> B. Recoveries Percent recoveries for the soil extraction <br /> surrogate standard 1,4-Difluorobenzene could not <br /> be determined for samples 29851-1 (SB-DIS-3-60), 9 <br /> 29851-2 (SB-DIS-3-66.5) , 29851-3 (SB-DIS-3-71.5) , <br /> and 29851-9 (SB-AIS-3-76) due to the required iA <br /> _. . <br /> dilutions. _..._ <br /> Matrix <br /> C. Spike Results: Not applicable. <br /> Oti0v? 9 � <br /> ias29 ...; <br /> CN2M NfLL Redding QualityAnolyticol Loboratories 5090 Coierpiifar Rood.Reddinri.Cofifornio 96003 91b.244.5227 <br />