Laserfiche WebLink
' Tracer Research Corporation <br /> Analytical Quality Aq-mirancr, Samples <br /> ' Quality assurance samples are performed at the below listed, or greater, <br /> frequencies according to the number of soil gas samples analyzed: <br /> ' Table 3 Quaity Assurance Samples <br /> Sample Frequency�P � <br /> ' Ambient Air Samples 2 per day or per site <br /> ' Analytical Method Blanks 5% (1 per 20 samples or 1 a day) <br /> ' Continuing Calibration Check 20% 0 every 5 samples) <br /> Field System Blank 10% (1 every 10 samples or 1 a day) <br /> ' Reagent Blank 1 per set of working standards <br /> Duplicate Samples 20% to 100% of all soil gas samples <br /> ' The ambient air samples are obtained on site by sampling the air immediately <br /> outside the mobile analytical van and directly injecting it into the GC. Analytical <br /> method blanks are taken to demonstrate that the analytical instrumentation is not <br /> contaminated. These are performed by injecting carrier gas (nitrogen) into the GC <br /> ' with the sampling syringe. Subsampling syringes are also checked in this fashion. <br /> The injector port septa through which soil gas samples are injected into the <br /> ' GC are replaced daily to prevent possible gas leaks from the chromatographic <br /> column. All sampling and subsampling syringes are decontaminated after use and <br /> are not used again until they have been decontaminated by washing in anionic <br /> 10 detergent and baking at 1001C. <br /> May 22.1992 Page 8 1-92-358 <br />