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2. If a SUMMA®canister is used,place a flow regulator and vacuum gauge Samples collected in syringes and glass bulbs should be analyzed as soon as between the vapor well and the SUMMA®canister.Perform near surface possible after collection. (e.g.,less than five(5)feet bgs)sampling using 1 L-SUMMAO or smaller containers. 2. Do not subject samples to extreme in temperatures. Heat can cause compound degradation and leakage from the syringe or glass bulb. Cold can 3. If the Tedlar bags or glass bulbs are used,add surrogates within 15 minutes cause moisture condensation which can affect the recovery of target analytes. of collection and analyze the samples as soon as possible after collection and If condensation is observed,the sample should be discarded and a new within 6 hours after collection(see Appendix B). ` sample should be collected. 4. Sorbent Tube sampling procedures:Details concerning selection of tube and Sorbent tubes: sorbent,conditioning of tube,sampling apparatus,sampling rates, preparation of sample collection,set flow rates,and other sampling 1. Samples tubes should be recapped with metal,Swagelok°•type caps and procedures are provided in the Compendium Method TO-17 (USEPA,1999). combined PTFE ferrules,rewrapped in aluminum foil(if appropriate)and replaced in the storage container immediately after sampling. 5. Specific recommendations for methane and hydrogen sulfide sample containers are specified in Section 3.9 2. Samples collected on tubes should be stored at less than or equal to 4°C and analyzed as soon as possible within 30 days after-collection. For certain 6. Alternate Sample Containers(see Appendices B)are also available for labile compounds,analysis should be done within one week(USEPA,1999; sampling soil gas. Add surrogates in samples collected in glass containers Compendium Method TO-17,Section 10.10). within 15 minutes and analyze the samples within 6 hours of collection. MiniCans,smaller and lighter versions of the passivated SUMMA®canisters, 3. Samples collected on tubes containing multiple sorbent beds should be can be used with the same limitations as the regular SUMMA®canisters.The analyzed as soon as possible after collection unless it can be verified that use of alternate size or tYPe of container should seek prior approval by the storage will not affect the recovery of analytes(USEPA, 1999;Compendium agency. m Method TO-17,Section 10,10). 14- X Sample Handling for All Sample Containers and Sorbent Tubes: Tedlar Bags: Soil gas samples should be analyzed as soon as possible after sampling. If there is an absolute necessity to transport samples in Tedlar°bags,the Ideally,samples are collected and analyzed immediately by a mobile laboratory; following should be noted: however,if samples need to be shipped to a fixed laboratory,then follow special handling procedures. 1. Do not expose soil gas samples in Tedlar bags to light and extreme temperatures. Photodegradation of target analytes is possible with light Samples collected in syringes should never be transported;however,samples exposure. Heat can cause expansion of the bag and possibly result in collected in sorbent tubes and SUMMA®canisters may be shipped for analysis at leakage. Cold can cause condensation of the sample. a fixed laboratory. The precautions noted below should be followed. 2. Do not subject soil gas samples in Tedlar bags to changes in ambient Sample handling procedures cited in the analytical methods being used should pressure. Changes in ambient pressure can adversely affect the integrity of be followed;however,since those methods are not designed for soil gas, the bags. Increases in pressure may collapse the bag and decreases in additional safeguards should be implemented to maintain the integrity of the soil pressure may expand the bag. These changes in pressures coupled with gas samples. possible flaws in the bag may cause sample loss due to leakage. Ambient pressure can change during the transport of samples. Samples traveling Syringes and Glass Bulbs: from the mountain area(lower pressure)to the lower desert area(such as Death Valley with higher pressure)can be subjected to significant pressure 1. Do not expose samples to light. Keep syringes and glass bulbs in a cool dark changes that may affect sample integrity. Alternate sample containers location at all times. Cover or wrap samples with foil and place into an should be selected when pressure changes are anticipated. insulated container(cooler but without ice)until the samples are analyzed, 3/3/2010 -27- 3/3/2010 -28-