Laserfiche WebLink
11 <br /> 4. Individual soil gas sampling probe fittings can be tested by spraying the "Duster" within <br /> one inch of the fitting and waiting for a response. Failed fittings will be checked for <br /> proper tightness and if this issue cannot be resolved, the fitting will be replaced. <br /> 5. After confirmation of acceptable tracer gas concentration from the sample probe, the soil <br /> gas sample may be collected. <br /> 6. Record the concentration of the tracer present in the shroud. <br /> enclosure to purge pump <br /> rehefvalve <br /> Iner t uaeer gas <br /> 3 sample probe <br /> 110(ats d bentonite plastic sheeting sealed <br /> surface seal soft gasket around edges <br /> (From NYSDOH,2006) <br /> After the soil gas probe has been appropriately purged and leak checked, samples will be <br /> collected for analysis, as follows: <br /> 1. Prior to sampling, each canister will be checked to verify that the pressure in the canister <br /> is set at less than minus 28 inches of mercury (i.e. under vacuum). If the pressure is <br /> greater than minus 24 inches of mercury, the SUMMA® canister may have lost its <br /> integrity due to laboratory error in preparation or leakage, and will not be used. <br /> 2. The initial vacuum will be recorded on the chain of custody(COC) form, and in the field <br /> log book. <br /> 3. Samples for laboratory analyses will be collected directly into pre-cleaned, 6-liter, flow- <br /> controlled, evacuated SUMMA® canisters. Flow controllers will be provided by the <br /> laboratory set to collect samples at a rate of 100 to 200 milliliters per minute. The <br /> SUMMA® canisters will be shipped to the field by the analytical laboratory batch <br /> certified clean to the specified method detection limit. <br /> 4. The sample canisters will be packed for shipment to the laboratory in rigid cardboard box <br /> containers supplied by the lab. Samples will be sent at ambient temperature to prevent <br /> condensation. A COC form describing the contents of the shipment will be filled out and <br /> placed in the shipping container. The shipping container will be sealed in a tamper <br /> evident manner. <br />