BTEX Migration through Various Geomembranes and Vapor Barriers
Bibliographic record
Abstract
Four polyethylene based vapor barriers and six different geomembranes were examined for their diffusive properties with respect to benzene, toluene, ethylbenzene, and xylenes (BTEX). All four vapor barriers performed comparably. Of the geomembranes tested, high-density polyethylene (HDPE) showed the greatest diffusive resistance to BTEX, while polyvinyl chloride (PVC) showed the least, LLDPE (linear low-density polyethylene), CSPE (chlorosulphonated polyethylene) and two KEE/EIA (ketone ethylene ester/ethylene interpolymer alloy) geomembranes all performed similarly, bounded by HDPE and PVC. Based on data collected at 22, 30, and 40°C, Arrhenius relationships are presented for the six geomembranes. Each geomembrane was evaluated for performance as a diffusive barrier in a landfill cover scenario. Each vapor barrier and two geomembranes were evaluated, through contaminant transport modeling, for performance as a diffusive barrier to vapor intrusion into a warehouse and substantial potential differences in performance are reported.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".