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Sites. In MGP USA:Third International Symposium and Exhibition on the
<br /> • Pump Placement. The sorbent tube should be upstream of the sampling pump. Redevelopment of Manufactured Gas Plant Sites,September 23-25,Mystic,CT.
<br /> http://www.caslab.com/News/Naphthalene-Air-Samplinci,pdf
<br /> • Sample Collection Flow Rate. The flow rate for sample collection should not vary by
<br /> more than ten percent. Hayes, H.,D. Benton,S.Grewal,and N. Khan. 2007. Evaluation of Sorbent
<br /> Methodology for Petroleum-Impacted Site Investigations.In Proceedings;Air and Waste
<br /> • Sorbent Tube Orientation. For thermal desorption methods,the sorbent tube must Management Association's Symposium:Vapor Intrusion: Learning from the Challenges.
<br /> be oriented in the appropriate direction during sample collection,which is usually September 26-28,2007, Providence, RI
<br /> annotated on the tube by the sorbent manufacturer or laboratory. http://www.airtoxics.com/literature/papers/AWMA VI 2007.pdf
<br /> • Field Documentation. Field data sheets should be completed in the field and Hayes,H.,D. Benton,S.Grewal,and N.Khan. 2005. A Comparison between EPA
<br /> submitted to the analytical laboratory. The sheets should contain the sampling flow Compendium Method TO-15 and EPA Method 8260B for VOC Determination in Soil
<br /> rates and sampling volumes required to quantify contaminant concentrations.These Gas. In Proceedings;Air and Waste Management Association's Symposium:Air
<br /> field data sheets should be included within the characterization report. Quality Measurement Methods and Technology. April 19-21,2005,San Francisco,
<br /> CA.
<br /> • Leak Check Compounds.Quantitative leak test compound such as helium can be
<br /> used as described in Appendix C. Leak test compounds,such as helium offer a nice Hayes,H.,N. Khan,and D.Benton. 2006. Impact of Sampling Media on Soil Gas
<br /> advantage over qualitative leak test compounds(e.g.Freons and alcohols),in that Measurements. In Proceedings;Air and Waste Management Association's Vapor
<br /> leakage can be quantified and are readily measured on site with a field meter or by a Intrusion Symposium:The Next Great Environmental Challenge-An Update.
<br /> stationary laboratory after the soil gas sample is collected.Qualitative leak test September 13-15,2006, Los Angeles,CA. Pages 69-83.
<br /> compounds are usually smaller than C7 and are not retained by Tenax. However,if
<br /> qualitative leak test compounds are used,the probes will need to be prescreened for Hayes,H.,Mahfood,J.,Shamory, B.2008.Comparison of EPA Compendium Methods
<br /> leaks using EPA Methods 5030/8260 prior to Tenax sorbent sampling. If leak test TO-15 and TO-17 for the Measurement of Naphthalene in Soil Gas.In Engineer's
<br /> compounds with carbon range of C7 or greater are used,an elevated concentration Society of Western Pennsylvania Proceeding. April,2008;
<br /> absorbed onto the sorbent tube may elevate the RL or even overload the mass http://www.eswp.com/brownfields/proaram.htm#TS4
<br /> spectrometer after desorption. A shut-in test of the above ground apparatus(i.e.,
<br /> fittings,sorbent tube(s)and lines)downstream from the probe should be performed McAlary,T.A., P.Nicholson,H.Groenevelt,and D.Bertrand.2009.A Case Study of
<br /> prior to sampling(McAlary,T.et al,2009). Soil-Gas Samplling in Silt and Clay-Rich(Low Permeability)Soils. Ground Water
<br /> Monitoring&Remediation.Volume 29, No.1. Pages 144-152.
<br /> • Tube Composition. Sorbent tubes composed of metal should be used due to
<br /> potential photochemical reactions. However,if only glass sampling tubes are Ouellette,G. 2004. Soil Vapor Sampling and Analysis-Lessons Learned. Presented
<br /> available,the tubes should be wrapped entirely in aluminum foil during and after at the Department of Energy/Petroleum Environmental Research Forum Soil Vapor
<br /> sample collection:'` Workshop. Brea,California;January 27-29,2004.
<br /> • Duplicate Samples. Duplicate sorbent tube samples should be collected at a pre- USEPA, 1999:United States Environmental Protection Agency. Determination of
<br /> determined frequency,usually at a rate of ten percent of the number of samples. Volatile Organic Compounds in Ambient Air Using Active Sampling onto Sorbent Tubes;
<br /> Compendium Method TO-17. Compendium of Methods for the Determination of Toxic
<br /> • Trin Blanks. Each shipping cooler should contain a trip blank. The trip blank should Organic Compounds in Ambient Air,Second Edition. Center for Environmental
<br /> be a sealed sorbent tube filled with the same sorbent as the sampling tubes Research Information,Office of Research and Development;Cincinnati,Ohio. January
<br /> 1999.
<br /> pursuant to the field procedures.
<br /> [httptp://www.epa.gov/ttnamti 1/files/ambient/airtox/to-17r.pdfJ
<br /> REFERENCES
<br /> Fortune,A., L.Gendron,M.Tuday. 2008. Comparison of Naphthalene Ambient Air
<br /> Sampling&Analysis Methods at Former Manufacturing Gas Plant(MGP)Remediation
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