English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

SUMMARYTwo soil-vapor sampling techniques were used to detect the presence of volatile organic compounds (VOC's) beneath a defense fuel supply point and adjacent property near Hanahan, S.C. Analyses of samples indicated levels of VOC's that suggest contamination of the water table aquifer or the soil zone. As a preliminary screening study, the soil-vapor survey also identified several areas that are potentially contaminated with VOC's.The empty-tube technique identified several areas in and around the DFSP facility that could be investigated further. The most extensive area where VOC's were detected in soil vapor at total response levels implying potential contamination is located in the northern part of area A, extending from south of tank 1 in area C, west and south to the approximate center of area A. Other extensive areas of elevated total response in soil vapor include the storage tank area, from east of tank 5 extending to the southeast of tank 2, and an area adjacent to the truck-loading facility extending from site A3 to site C2 and north to site Cl, immediately west of the tank 4 containment area. Other isolated sites of elevated total response are located at sites C20, southeast of tank 6, and at site D12, on the southern boundary of DFSP. The empty-tube technique also detected elevated VOC content in the bottom- sediments of the drainage ditch, east of the facility, and to a lesser extent, in the bottom-sediments of the stream, southwest of the facility. The distribution of toluene was found to be similar to that of the total response, with detection ranging from 1 ppb to greater than 76,000 ppb, the upper limit of calibration. The distribution of ethylbenzene was also similar to that of the total response except for the lack of detection in bottom-sediments of most reaches of the stream and drainage ditch. Ethylbenzene was detected at concentrations ranging from 10 ppb to greater than 76,000 ppb. The identification of toluene and ethylbenzene must be considered tentative.As a qualitative comparison to the empty-tube technique, theactivated-carbon technique showed a distribution of toluene in area A similar to that obtained by the empty-tube method, with the highest concentrations found in the northern part of the area. Other compounds and compound classes detected by the activated-carbon samplers included benzene, ethylbenzene, xylene, tetrachloroethylene, C~ alkyl benzenes, and C^-C^^ cycloalkanes and alkenes. Activated-carbon samplers at sites E7A and E9 in area E (stream-bottom-sediments) detected relatively high toluene concentrations. Both methods showed an irregular distribution of VOC's in the stream-bottom- sediments. This could be attributable to site hydrology, sources unrelated to soil vapors, and the transport and deposition of contaminated sediments.From the results of this investigation, it can be concluded that further investigation of contamination in the water-table aquifer beneath the facility is needed. These areas need additional investigation of a more site-specific and quantitative nature to characterize the contamination. The detection of compounds tentatively identified by this investigation may be confirmed by subsequent investigation.22

Distribution of volatile organic compounds in soil vapor in the vicinity of a defense fuel supply point, Hanahan, South Carolina