Guidance on EPA SW-846 Method 5035

We have the capabilities and supplies to provide any of the Method 5035 options. However, because of some disadvantages, our laboratory favors the use of disposable EnCore™ samplers, with zero headspace design, for the collection of soil samples for volatile analysis. The EnCore™ sampler is available in 5g and 25g sizes. Some regulatory agencies may mandate using the 5g size. Three 5g EnCore™ samplers, with a 2 ounce jar for percent moisture, would be required per sampling site to include the following:

• A 5g aliquot for the sample analysis
• A 5g aliquot as a back-up for the sample analysis
• A 5g aliquot for a methanol extraction, which would be used for screening and/or a high concentration analysis
• A 2 oz. aliquot for a % moisture determination

In most cases, the methanol aliquot (containing surrogates) will be used for screening purposes. Based on those results, other tests will be performed. Once aliquots of the soil sample, taken from the EnCore™ sampler, are added to vials containing preservative, the remainder of the 14 day holding time is available.

Advantages of use of the EnCore™ include the following points:

• No need to take or use a balance in the field
• No exposure of field personnel to corrosive sodium bisulfate or flammable/toxic methanol
• No additional shipping paperwork or cooler labeling
• No need to use the costly closed system purge and trap vials in the field
• No chance of volatile sample container breakage during shipment
• Significant decrease in man-hour requirements to complete the field sampling efforts