FROG-4000 Case Study – Using Portable GC for Vapor Intrusion Testing
Abs: Defiant Technologies participated in a field test in cooperation with EPA NERL in Nevada, RTI International, and ARCADIS-US. The test was conducted at a home located in Indianapolis shown in Figure 1. Two systems were deployed in Indianapolis. One was used to continuously monitor the ambient air concentration of tetrachloroethene (PCE) in the basement and the second system was used to monitor PCE vapors in sub-slab ports and obtain measurements of PCE in water from a monitor well. Several split samples were collected and sent to an offsite lab for analysis by thermal desorption GC-MS. Split sample data shows good correlation with onsite measurements. Results are presented in this summary… Continue reading
Field Detection of Chlorinated Alkenes in Well Water Using the FROG-4000TM Portable GC
ABS: Well 12A was a municipal water supply well located in Tacoma Washington approximately 4 miles southwest of the southernmost tip of Commencement Bay. The well is now a superfund site contaminated with chlorinated alkenes. Groundwater samples were collected and analyzed by portable GC device and compared the result with GC-MS in off-site lab… Continue reading
Release Discovery and Confirmation for UST
Early detection of an UST release is important, as is determining the source of the release, the type of fuel released, the occurrence of imminently threatened receptors, and the appropriate initial response… Continue reading
Contaminant in bedrock
Fractured Rock Abs：Contaminant transport and fate is fundamentally different in fractured rock than in unconsolidated (sand and gravel) aquifers. Significantly more uncertainty exists as to the direction and rate of contaminant migration, as well as the processes and factors that control chemical and microbial transformations. Contaminant transport and fate is fundamentally different in fractured … Continue reading
Release Detection for Underground Storage Tanks (USTs)
Because detecting UST systems releases quickly helps stop contamination before it spreads from UST sites, EPA requires owners and operators detect releases from their UST systems. EPA allows three categories of release detection: interstitial, internal, and external. These three categories include seven release detection methods… Continue reading