3.1 SUMMACanister Sampling After the sub-slab soil gas sample is collected, the canister valve is closed, an identification tag is attached to the canister and the canister is transported to a laboratory under chain of custody for analysis. pathway is complete. Mobile laboratories are being utilized for soil gas and some indoor air sampling. Mobile laboratories are being utilized for soil gas and some indoor air sampling. The ambient air and sub-slab soil gas sampling was conducted on August 16, 2018, by Mr. Jack Taylor, EHSI Technician. Search Can't Find What You're Looking For? endstream endobj 1274 0 obj <. %PDF-1.6 %���� Chemical Weapons Detection – Exhaled breath not only contains high concentrations of carbon dioxide and water vapor, but also contains a signature of all chemicals in the blood that have at least some vapor pressure to allow their exchange from the blood into the exhaled breath through the alveoli in the lungs. Soil Gas and Soil Vapor Sampling Soil gas or Soil vapor sampling can be achieved in a wide variety of locations under a wide variety of conditions. Subslab soil gas sampling and analysis is a common line of evidence for assessing human health risks associated with subsurface vapor intrusion to indoor air for volatile organic compounds; however, conventional subslab sampling methods have generated data that show substantial spatial and temporal variability, which often makes the interpretation difficult. As shown on Figure 1, … Once the hole is drilled, a bottle brush is used to clean the concrete dust from the boring. endstream endobj startxref • Removes sufficient volume of gas from a 6-inch gravel layer (30% porosity) to withdraw all soil gas within a radius of 25-50 feet. APPENDIX III - Air Sampling Information APPENDIX IV - MassDEP’s Recommended Specifications for the Design and Construction of … The AMS Sub-Slab Gas Vapor Probe Kit provides a semi-permanent probe, designed to allow repeated sampling over time in order to assess the potential of contaminated vapor intrusion from beneath buildings and offers an opportunity to collect samples directly beneath the floor slab of a building. Recommended references for indoor air, crawl space, sub-slab and ambient air sampling, and vapor intrusion mitigation techniques. In general, both perimeter and sub-slab soil gas samples should be collected as close as possible to exterior walls. Subslab, near-slab, crawl space, and groundwater soil gas sampling can be performed using passive samplers. For soil gas sampling, a slam bar or electric rotary hammer-drill is used to drive a 1/ 2 to 1-inch (2.5cm) diameter hole to a depth of three or more feet (1 meter) below grade. The most recent version is presented in the top row of the table. Soil gas or Soil vapor sampling can be achieved in a wide variety of locations under a wide variety of conditions. and is particularly well suited to sub-slab soil vapor sampling as part of a vapor intrusion (VI) assessment. It does not impose any requirements or obligations on the regulated community. • Concentration of extracted vapors monitored as a function of time. h�b```b``������+� € "@1V ��l �13��x!>�%ȁŗ!ȁ��!ށ=��ǁE�!��V�!݀��0jf�n0����n��|������œn���(�\u��&�s�ً~�8ϙv��G�����|Eѱ��d�lۥ�Vπ][t��u�������d�P&�x�� �����d��D�W����c -2 `� �L�9D�D?0�1�n`da���8�"�+]p{�� ��|5��8�> � �ڿ�� A system for sampling sub-slab soil gas having an adaptor body that includes a first barbed portion, a collar portion, a second barbed portion, an internal cavity that axially passes through the length of the adaptor body, and a coupling portion. Soil Gas Sample Collection Since sub-slab sampling is from very shallow depths (typically 2” to 6” below surface), minimum purge volumes and low volume samples are preferred to minimize potential breakthrough from the surface. Recommended methods and techniques for soil gas sampling. Seventy-three (73%) of the respondents recommend or require subslab samples; however, only 17% have written guidance on how to collect the sample, and how many samples to collect. sub-slab depressurization system and the revised supplemental soil investigation work plan. For additional background information, see . Tracer/leak gas is necessary to ensure breakthrough does not occur. October 2006 Final NYSDOH CEH BEEI Soil Vapor Intrusion … endstream endobj 432 0 obj <. But sub-slab sampling has its share of problems. Recommended methods for deriving subsurface media concentrations that protect indoor air quality from contaminated subsurface media. Sludge and Sediment Samplers; Sludge and Sediment Sampling Kits; Russian Peat Borer; Silt, Sand, and Bottom Dredges; Core / Split Core Samplers. endstream endobj startxref Both of these reports were revised based upon The department will collaborate with Hamilton Sundstrand and Golder Associates on the work to prepare the supplemental remedial … Gas Vapor Probe Kits; Heavy-Duty Gas Vapor Probe Kits; Sub-Slab Gas Vapor Probe Kits; Gas Vapor Implant Drive Kit; Gas Vapor Implants; Sludge and Sediment Samplers. This Advisory applies to both subsurface soil gas samples and soil gas samples collected in sub-slab areas under buildings. Calculate the volume of air (volume = π r²h) in the tubing and purge three tubing volumes prior to sample collection at a rate no greater than 0.2 liter per minute (lpm). AMS has been a leader in soil gas sampling technologies since the development of the “original” AMS gas vapor probe. 1304 0 obj <>stream Cox-Colvin designed the Vapor Pin specifically to eliminate many of the problems associated with traditional sub-slab soil gas sampling methods. In the case of subslab soil gas sampling, the adjacent medium might either be deeper soil gas, indoor air leaking through the floor slab, or ambient air drawn from outside the building footprint, which will be discussed further in the following text.The concept of high purge volume (HPV) sampling is not new. EnviroClass.com is the leading webinar platform for online PDHs in the environmental industry with world renowned speakers for Remediation, Vapor Intrusion, Wastewater, and Air Quality. Where it is not possible to install a sub-slab probe due to high groundwater conditions, sub-slab vapor samples can be collected from a sump pit. prior to sampling of sub-slab soil gas. There are two types of sampling: exterior or near slab soil gas samples collected outside a current structure or in areas where a future building will be located; and sub-slab soil gas samples collected directly underneath a building (through the foundation of the building). Sub-slab soil gas samples should be collected using the following procedures: • Purge the tubing using a vacuum pump or gas-tight syringe (~60 cc). gas or ground water sampling, sub-slab gas sampling can be used to differentiate indoor and outdoor sources of volatile organic and inorganic compounds from compounds emanating from contaminated subsurface media. Sub-Slab Gas Vapor Probe Kits; Gas Vapor Implant Drive Kit; Gas Vapor Implants; Sludge and Sediment Samplers. Once the hole is drilled, a bottle brush is used to clean the concrete dust from the boring. Sampling of sub-slab soil gas began at 11:05 AM and continued for approximately six minutes at a flow rate of approximately 125 milliliters per minute. 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