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2.6.3 Sample Container Cleanliness and Decontamination <br /> A Prior to its first use at a site, each sample container should be <br /> assured clean by the analytical laboratory as follows: <br /> 1. New containers should be determined to be free of <br /> contaminants(e.g., lubricants) by either the supplier or the <br /> analytical laboratory; and <br /> 2. Reused/recycled containers: Method blank(s), as specified in <br /> Section 2.7.1.A, should be used to verify sample container <br /> cleanliness. <br /> B. After each use, reusable sample containers should be properly <br /> decontaminated. <br /> 1. Glass syringes or bulbs should be disassembled and baked at <br /> 240°C for a minimum of 15 minutes or at 120°C for a <br /> minimum of 30 minutes, or be decontaminated by an <br /> equivalent method. <br /> 2. Summar' canisters should be properly decontaminated as <br /> specified by appropriate EPA analytical methods. <br /> 3. During sampling activities using reused/recycled sampling <br /> containers(e.g., glass syringes, glass bulbs), at a minimum <br /> one (1)decontaminated sample container per 20 samples or <br /> per every 12 hours, whichever is more often, should be used <br /> as a method blank(as specified in Section 2.7.1.A)to verify <br /> and evaluate the effectiveness of decontamination procedures. <br /> C. Plastic syringes should be used only once and then properly <br /> discarded. <br /> 2.6.4 Field Conditions: Field conditions, such as rainfall, irrigation, fine- <br /> grained sediments, or drilling conditions may affect the ability to collect <br /> soil gas samples. <br /> A Wet Conditions: If no-flow or low-flow conditions are caused by <br /> wet soils, the soil gas sampling should cease. In addition,the <br /> Agency recommends that the soil gas sampling should not be <br /> conducted during or immediately after a significant rain event(e.g., <br /> 1/2 inch or greater) or onsite watering. <br /> B. If low flow conditions are determined to be from a specific lithology, <br /> a new probe should be installed at a greater depth or a new lateral <br /> location should be selected after evaluation of the site lithologic <br /> logs (See Section 2.2.1) or in consultation with Agency staff. <br /> 01/28/2003 - 13- <br />