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STANDARD OPERATING PROCEDURES SOP: 1704 Y_, """""3 PAGE: 2 of 11 !> REV: 1.0 S E R AS EFFECTIVE DATE: 11/16/15 SUMMA CANISTER SAMPLING 1.0 SCOPE AND APPLICATION The purpose of this Standard Operating Procedure(SOP)is to describe a procedure for sampling of Volatile Organic Compounds (VOCs) in ambient air. The method is based on samples collected as whole ai samples in SUMMA or equivalent passivated stainless steel canisters. The VOCs are subsequent) separated by gas chromatography (GC) and measured by mass-selective detector or multi-detector techniques. This method presents procedures for sampling into canisters at final pressures belo atmospheric pressure referred to as sub-atmospheric pressure sampling. This method is applicable to specific VOCs and a limited set of other compounds that have been tested an determined to be stable when stored in subatmospheric pressure canisters. The volatile organic compounds that have been successfully collected in canisters by this method along with their reporting limits are listed in Appendix A. These compounds results are reported as parts per billion by volume (ppbv) an micrograms per meter cubed(µgW). Q_ A Quality Assurance Project Plan (QAPP) in Uniform Federal Policy (UFP) format describing the projec objectives must be prepared prior to deploying for a sampling event. The sampler needs to ensure that th methods used are adequate to satisfy the data quality objectives listed in the QAPP for a particular site. The procedures in this SOP may be varied or changed as required,dependent on site conditions, equipment limitations or other procedural limitations. In all instances, the procedures employed must be documented on a Field Change Form and attached to the QAPP. These changes must be documented in the final\j deliverable. (3 2.0 METHOD SUMMARY Subatmospheric pressure sampling uses an initially evacuated canister and mass flow controller to regulat flow. With this configuration, a sample of air is drawn through a sampling train comprised of component that regulate the rate and duration of sampling into a pre-evacuated SUMMA canister. Alternatively subatmospheric pressure sampling may be performed using a fixed orifice, capillary or adjustable micro- metering valve in lieu of the mass flow controller arrangement for taking grab samples or time-integrated samples. Grab samples are typically collected during discrete odor events. For grab sampling,the caniste value is opened, and the vacuum inside the canister draws in an air sample in a few seconds. Time- integrated sampling is conducted over a specific period of time to acquire a specific volume of air. Th most common use is for the collection of sub-slab soil gas, indoor and ambient air samples associated with vapor intrusion activities. 3.0 SAMPLE PRESERVATION,CONTAINERS,HANDLING AND STORAGE Sample holding times must be determined prior to initiating field activities and are dependent on the compound (s) being analyzed. Canisters and orifices should be stored in a cool dry place and always be placed in their plastic/metal shipping boxes during transport and storage to protect the canisters from dents and/or punctures during transport. Z� Typically 6-liter (L) passivated canisters are used for vapor intrusion and/or odor events although 1-L canisters may also be used. After the air sample is collected, the canister valve is closed, an identification tag is attached to the canister and the canister is transported to a laboratory for analysis. Upon receipt at the laboratory,the canister tag data are recorded.