Evaluation of effectiveness of ground water screening with a field GC
- Resource Engineering Associates, Inc., Middleton, WI (United States)
During an environmental investigation of a potential tetrachloroethylene (PCE) source at a manufacturing facility in Wisconsin, A geoprobe and mobile gas-chromatography (GC) were utilized to rapidly screen ground water samples, thus identifying locations for monitoring wells and depths at which to install well screens. The results are used to evaluate the benefits for using a geoprobe with mobile GC for ground water screening, and to compare mobile GC screening results with certified laboratory analyses of duplicate samples. Hydrogeologically the site consists of a discontinuous, shallow perched water table underlain by a clay aquitard. Below the clay a thin sand aquifer is located above a sandstone bedrock aquifer. Early in the investigation, PCE (190 ppb) was detected in ground water from the facility`s water supply well. The well was open to sandstone bedrock from 45 to 80 feet below the surface. Evidence from a soils investigation suggested an off-site PCE source. A geoprobe was used to collect ground water samples for PCE screening. Borings GP-1, GP-2, GP-3, GP-4, and GP-5 were advanced to the bedrock surface in areas upgradient and sidegradient of the site using the geoprobe. Ground water samples were collected at the local water table (25 to 27 feet deep), and at the bedrock surface (35 to 40 feet deep) in each sampling location and screened on-site for PCE using the mobile GC. Duplicate samples (collected for confirmation purposes) were analyzed by an environmental laboratory. Field GC screening detected 13 ppb of PCE in ground water samples at the bedrock surface at GP-2, and PCE was tentatively identified at the level of detection (4 ppb) at nearby GP-3.
- OSTI ID:
- 122469
- Report Number(s):
- CONF-9510211-; ISSN 0017-467X; TRN: IM9547%%49
- Journal Information:
- Ground Water, Vol. 33, Issue 5; Conference: 1995 Association of Ground Water Scientists & Engineers (AGWSE) educational program, Indianapolis, IN (United States), 28-30 Oct 1995; Other Information: PBD: Sep-Oct 1995
- Country of Publication:
- United States
- Language:
- English
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