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The sampling ports are brass connections,fitted with silicone septa,and threaded into a tapped hole in the system piping. SOP-14 Samples are collected by inserting a clean syringe into the SOIL VAPOR SURVEY SAMPLING:INDOOR AIR septum and the plunger actuated several times. Each SAMPLING WITH SUMA CANISTERS syringe should be purged of three syringe volumes before collecting the sample. On the fourth purge,the plunger is Indoor air sampling requires an eight hour air sample extracted slowly until the syringe is filled with a gas sample, obtained with 6-liter Suma canisters equipped with flow then the syringe is withdrawn and the needle immediately controllers(calibrated by the laboratory)to a flow rate of 11.5 plugged with a silicone stopper. The sample should be milliliters per minute(ml/min). Suma canisters are placed in placed in a non-refrigerated,dry cooler with sufficient each floor of the building at the center of the room being packing to eliminate breakage during transport. Cooling sampled at a height of approximately three to five feet above samples will cause condensation of moisture,thereby ground level,to simulate the typical breathing zone. More distorting laboratory analysis. than one indoor air sample may be required to determine a Duplicate air samples should be collected as in SOP-10. representative sample of all occupants in the building. Vapor samples are also subject to the same hold times and Associated with each indoor air quality sample is an ambient must be stored as stated in SOP-10 air sample that is collected outside the subject building. The ambient air quality sample consists of one 6-liter Suma canister with a sample collection time of 8 hours at a flow SOP-13 rate of 11.5 ml/min. The ambient air Suma canister is placed SOIL VAPOR SURVEY SAMPLING:"TEDLAR"BAG approximately 5 to 15 feet upwind of the subject building and SAMPLING TECHNIQUE 5 feet above ground level. Due to most buildings having an air exchange ratio of 0.5 to 1.0 exchanges per hour, The sampling equipment consists of a"Tedlar"bag sampling of the ambient air quality will begin at least one (available in 1,3,5,and 10 liter sizes),an SKC universal hour prior to the indoor air sample. sample pump,soil vapor probe,and 1/4-inch-diameter polyethylene tubing(approximately three feet long). With all Suma canister sampling the valve should be opened and the initial pressure should then be recorded to verify that A Roto-hammer or slam bar is used to obtain a three foot the Suma canister is under vacuum. The Suma canister is hole into the ground area,where the soil vapor sample will allowed to collect the soil vapor sample at a predetermined be collected. Once the hole has been formed the soil vapor duration(usually eight hours). After the sample has been probe will be inserted into the hole and advanced the collected record the final vacuum reading(approximately five remaining two feet,five feet total below ground surface pounds per square inch gauge(psig))to ensure that the flow (bgs),with the use of either a slide hammer,using a tee meter was working properly. Immediately following the adapter and using physical force. Once the vapor probe has sample collection,complete sampling information is been inserted into the ground a bentonite seal must be recorded on the label on the air sampling canister(e.g., formed between ambient air and the sample air. The sample ID,date,time,location,and temperature). The bentonite must be hydrated and create an air tight seal sample is placed in a non-refrigerated,dry cooler with around the probe.If required IPA can be placed on the joints sufficient packing to ensure against damage during of the vapor probe and analyzed for in the sample to ensure transport. Cooling samples will cause condensation of any that ambient air is not diluting the soil vapor survey samples. moisture within the air sample,thereby distorting laboratory analysis. Once the sample apparatus has been set up,new tubing will be connected to the inlet of the SKC sample pump. The Suma canister samples are subject to hold times of typically pump operates at a low flow purge rate of approximately 200 30 days and with some compounds a more rigid hold time of milliliters per minute to prevent air stripping of contaminants 14 days is required. from the soil. Once three volumes have been evacuated (minimum 4.2 minutes of sample time)a sample can be collected. Verification with a PID will determine when the maximum concentration is obtained and a sample should be collected. If measurable concentrations are not obtained with the PID after 7 purge volumes(10 minutes)a sample should be collected. Once a sample has been determined to be collected new tubing will be placed on the effluent of the sample pump running to the Tedlar bag,which should be filled to 3/4 of volume capacity. Caution should be taken not to overfill the sampling bag. The sample is placed in a non- refrigerated dry cooler with sufficient packing to eliminated damage during transport. Cooling samples will cause condensation of moisture within the sample,thereby distorting laboratory analysis. To minimize the potential for cross-contamination between air samples new polyethylene tubing will be used for every sample. Vapor samples are also subject to the same hold times and must be stored as stated in SOP-10