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STANDARD OPERATING PROCEDURES <br /> SOP: 1704 <br /> """3 PAGE: 3 of 11 <br /> REV: 1.0 <br /> S E R AS EFFECTIVE DATE: 11/16/15 <br /> SUMMA CANISTER SAMPLING <br /> 4.0 INTERFERENCES AND POTENTIAL PROBLEMS <br /> Contamination may occur in the sampling system if canisters are not properly cleaned before use. <br /> Additionally, all other sampling equipment(e.g. flow controllers)must be thoroughly cleaned. Instruction <br /> for cleaning the SUMMA canisters and flow controllers are described in the Scientific, Engineering, wo <br /> Response and Analytical Services (SERAS) SOP #1739, Procedures for SUMMA Canister and Flow <br /> Controller Cleaning, <br /> Care must be used with canister valves. Do not overtighten the valves. <br /> (J <br /> Ambient air sampling during rainy weather may result in clogging of the flow controller filter causing reduction or <br /> stoppage of flow.Sampling during rainy weather should be avoided. <br /> 5.0 EQUIPMENT/APPARATUS _Q <br /> • Sampling inlet line(optional)-Teflon tubing to connect the sampler to the environment being sampled <br /> (e.g. sub-slab,ambient) <br /> • SUMMA canister,Restek Corporation,PA,Model#27420 or 27408 or equivalent-leak-free stainles*ft� <br /> steel pressure vessels of desired volume with valve and electropolished interior surfaces,certified clean <br /> by the laboratory for the analytes of interest and leak checked <br /> • (Optional) Particulate matter filter, Swagelok, OH, Model SS-2F-K4-2 or equivalent - 2-µm sintere <br /> stainless steel in-line filter. 0 <br /> • Mass flow controller, fixed orifice, capillary or adjustable micro-metering valve, Valco Instruments <br /> TX,VICI Model 202 or equivalent-for grab samples or time-integrated samples. <br /> • Vacuum gauge,certified annually,to record canister vacuum in inches of mercury <br /> • Flow meter, accompanied by an annual certificate of analysis,to verify orifice flow rates(ADM3000 or <br /> 2: <br /> equivalent) <br /> • Wrench,9/16" <br /> 6.0 REAGENTS <br /> This section is not applicable to this SOP. (J <br /> 7.0 PROCEDURE ;2: <br /> 7.1 Grab Sample Collection Zj <br /> A canister, which is evacuated to one atmosphere below ambient and fitted with a flow restricting <br /> device, is opened to the atmosphere containing the VOCs to be sampled. The pressure differential <br /> causes the sample to flow into the canister. This technique may be used to collect grab samples <br /> (duration of seconds).The typical steps for collecting a grab sample are as follows: <br />