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TO E RO E K SOP No.026,REV.1 ASSOCIATES,INC INDOOR AIR AND SUB-SLAB SOIL GAS SAMPLING METHODS I PAGE 7 During indoor air sampling, the SUMMA®canister is attached directly to the regulator and the valve is opened for sample collection. To collect indoor air samples, the following procedures are used: 1. Confirm the valve of the SUMMA®canister is closed and remove the brass cap.Attach the pressure gauge and flow controller (integrated system) to the canister.Attach the brass cap to the side of the gauge"T"valve to ensure a closed sample train.Note:some SUMMA® canister models utilize a quick-connect system and do not require the removal of brass caps. For quick-connect SUMMA® canisters, disregard further mentions of removal and replacement of the brass cap 2. To verify vacuum of a canister, open and close the valve quickly (a few seconds) and read the vacuum on the gauge. Record the initial vacuum. Replace the brass cap. 3. To collect a sample, remove the brass cap and attach the controller. Place the brass cap at the end of the flow controller to create an airtight train. Quickly open and close the canister to check for leaks. If the needle on the gauge drops, the sample train is not airtight. If the train is not airtight, all connections should be refitted or tightened until the needle on the gauge is steady. Place the sample port at 3 to 5 feet above the ground/floor surface to represent the breathing zone level. 4. Once the sample train is airtight, turn the valve counterclockwise until fully opened, which will allow the evacuated canister to draw in indoor air. Immediately record the canister pressure reading and time. Also, record the initial vacuum of the canister. Note: some SUMMA®canister models do not have a rotating valve and utilize a switch to flip the canister open and close (the same basic sample collection process applies to these canisters). S. Monitor sampling progress periodically.When target sample collection time specified in the QAPP/FSP has been reached, close the canister valve by turning clockwise until snug. Replace the brass cap. 6. Record the time and post-sampling pressure reading on the canister pressure valve. Do not let the vacuum be reduced to zero pressure as this will compromise the analytic results. If not specified otherwise by the analytical laboratory, when the