Measurable Analysis and Sorbent Collection Methods MSRAS Soil Gas Sampling Workshop Indianapolis, IN August 21-22, 2006

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´╗┐Scientific Analysis and Sorbent Collection Methods MSRAS Soil Gas Sampling Workshop Indianapolis, IN August 21-22, 2006 Gina Plantz NewFields Environmental Forensics Practice, LLC gplantz@newfields.com 781-264-4950

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Why utilize Forensics? Capacity to separate between wellsprings of defilement BTEX (benzene, toluene, ethyl benzene and xylenes) mixes are ordinarily used to decide the hydrocarbon source(s) BTEX is available in a wide range of hydrocarbon sources and more data is required for authoritative synthetic fingerprinting Ability to separate VI impacts from foundation sources Common practices to manage recognizing background: Building review and item stock Using marker mixes identified by standard system (e.g. Benzene, MTBE, isooctane, isopentane for gas constituents) Compound proportion examination of mixes identified by standard philosophy between sub-section and IA

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Forensic Approach Air strategy created to "unique mark" HC sources Extended analyte list particular to hydrocarbons (93 mixes; PIANO, Thiophenes, Fuel Additives) Analysis by GC/MS/FID MS is keep running in synchronous full SCAN and SIM modes Reporting breaking points are 20-50 pptv Ability to separate foundation from soil gas impacts Ability to identify follow levels of target mixes in nearness of high fixation tests

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Ertel Sample Collected from SS3D Analysis by EPA TO-15: TCE @ 55,000 ppbv Large weakening required for investigation, prompting to lion's share of Non-identifies for different targets Analysis by Forensic TO-15: Ability to dissect test without weakening prompting to sub ppbv RLs for HCs

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Ertel Sample Collected from SS3D TCE, 42 ppbv on segment (55,000 aggregate) EPA TO-15 TCE Benzene, 2.2 ppbv on segment (22 add up to) Forensic TO-15

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Ertel Sample Collected from P6 Analysis by EPA TO-15: PCE @ 11,000 ppbv Large weakening required for investigation; few HCs distinguished driving and numerous non-recognizes for different targets Analysis by Forensic TO-15: Ability to break down example without weakening prompting to unique mark example and sub ppbv RLs

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Ertel Sample Collected from P6 PCE, 53 ppbv on segment (11,000 aggregate) EPA TO-15 C5 Forensic TO-15 C6 C4 C7 T PCE MPX 124TMB N

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Why utilize sorbent media? Numerous states have mixes of concern which just concentration particularly on VOCs 114 mixes in Table 2 of OSWER Guidance VOCs, SVOCs, PCBs, Metals EPA TO-15 is material for VOCs Nothing heavier than Naphthalene Sorbent gathering/examination strategies essential for all SVOCs Sorbent sorts (PUF/XAD, Tenax, and so forth.))

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What to pay special mind to w/sorbent accumulation RLs are based upon the measure of test volume gathered Sample volumes expected to meet screening criteria may not be down to earth for some screening levels Sample copies are suggested at every point (TO-17) Sample achievement may happen at high stream rates or with high focuses Recommended that tubes are put in arrangement when high fixation is normal Samples must be chilled <4 C

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Sample Volume expected to meet 10 - 6 Shallow Soil Gas Screening Criteria ( OSWER Draft VI Guidance, 2002) Slide obligingness of Severn Trent Laboratories

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www.skcinc.com www.sensidyne.com EPA TO-17 Will be exhibited tomorrow Samples gathered on a sorbent tube with utilization of pump Collect copy tests per inspecting point Analyzed by GC/MS Holding time is 14 days from accumulation Must be chilled <4 C

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SVOC accumulation Picture civility of GeoSyntec TO-13A: PAHs and numerous other 8270 mixes; TO-4A: Pesticides & PCBs (counting congeners); PUF/XAD media for test gathering Modified adaptations: low stream pump Samples must be chilled <4 C

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Summary Forensic procedures for VI evaluations are a developing and intense apparatus Forensic TO-15 demonstrated the capacity to report hydrocarbons to low ppbv RLs in nearness of ppmv levels of chlorinated mixes Forensic TO-15 could unique mark a potential hydrocarbon source where standard TO-15 was not ready to distinguish numerous hydrocarbons because of hoisted PCE and TCE Adsorptive media is required for all SVOC gathering Current techniques for SVOC accumulation and investigation may not be commonsense for meeting activity levels

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