Well field

A site view during construction of the BTES system at UOIT well field, showing the grids of boreholes and piping that interconnect them is shown in Figure 81. Here, uncapped well heads show up as black dots. Four-inch piping runs from the wells into the mechanical corridors that circle the field. 

T. Sakata and Y. Miyahara, Detection of DNA recognition events using multi-well field effect devices. Biosens. Bioelectron. 21, 827-832 (2005). 

When analyzing water from the well field at the City of Lincoln, Nebraska, Water Treatment Plant Laboratory for herbicides, the herbicides are extracted from the water by passing 1 L of the water through a solid phase extractor disk, where the herbicides are adsorbed (see also Section 2.6.1). The adsorbed chemicals are then washed from this disk with a mixture of ethyl acetate and dichloromethane. Because this organic mix always retains some water, the solution is then passed through an anhydrous sodium sulfate column for drying. 

Verona Well Field Superfund site, Michigan CVOCs 1,753,833 63.54 NA... 

A map showing sampling points (groundwater well field a grid from which samples were collected a drawing of an excavation with measurements etc.)... 

Fig. 4.20 Monthly maps of equal groundwater temperature for a well field bordering the Mohawk River (after Winslow et al., 1965). The river temperature changed over an annual cycle from 77 to 32 °F. The aquifer followed these temperature changes, indicating recharge from the river.

Table 6.5 Dissolved Ions in the Hot Fudge Well Field (meq/1)...

Identifying intrusion of water from adjacent wells as a result of pumping tests and in intensively exploited well fields. 

At Orapa, northern Botswana, a new well field of confined water was developed and two hypotheses were proposed to explain the origin of... 

Checking hydraulic interconnections between the Grand Dam and the Grey town municipal well fields I and IV... 

A clear and concise description should be provided on relevant human activities in the study area. These should include dams, drainage channels, recharge installations, sewage ponds, industrial effluent ponds, fluid waste disposal installations, pumped well fields, and the nature and extent of agricultural activity, including irrigation schemes and the use of fertilizers (types, quantities) and pesticides (types, quantities). Part of the information may be abstracted from detailed maps, but most information has to be obtained directly from local authorities, farmers, and industry. 

The assumed source of fecal coliform contamination is a wastewater treatment plant located 400 m upstream of the well field. Primary-treated wastewater is collected in a basin during rain storms, the retention basin sometimes overflows and the treated wastewater flows into Terrieu Creek. Previous research by Malard et al. (1994) at this... 

At the well field adjacent to Terrieu Creek in southern France, a large proportion of fecal coliform bacteria was associated with suspended sediment, at times up to 90%. Bacterial concentrations associated with sediment in surface water and in the subsurface were very similar, indicating a close connection between the two. The association of bacteria with sediment has important implications for public health. The bacteria may be protected from predation, may be able to use the substrate as a food source, and are less susceptible to standard methods of disinfection. 

U.S. EPA, "Case Study of Ground Water Extraction with Ait Stripping, Eau Claire Municipal Well Field Site," in Innovative Operational Treatment Technologies for Application to Superfund Sites Nine Case Studies, prepared by T. Pheiffer, U.S. Environmental Protection Agency, Washington, D.C., 1990. 

The source of the oxidant in the severely impacted wells is most likely the borehole. The strong correlation between high arsenic and the interface of the SCH with the static water level in the well, in both confined and unconfined areas if the St. Peter aquifer, indicates that this interaction exerts significant control on arsenic release. Under confined conditions, the air-water-sulfide interface only occurs within the well. Field data also show that in the confined portion of the aquifer, the DO concentration in borehole water is significantly higher than in formation water. The borehole appears to promote oxidation of sulfides in the SCH in wells where the static water level is approximately coincident with the SCH. 

An air-stripping system designed to minimize energy requirements (8) was installed to remove volahle organic compounds at levels between 200 and 250 pg/L from drinking water supplied by a municipal well field. The system was capable of treahng 2.16 MGD (8,176 m /d) at effluent levels not exceeding 10 pg/L total VOCs. Total installed cost was approx 200,000, and operational costs were less than 20,000/yr. 

Cooper, H. H., Jr. and Jacob, C. E. (1946). A Generalized Graphical Method for Evaluating Formation Constants and Summarizing Well Field History. Tram. Am. Geophys. Union 27, 526-534. 

Figure 15.1 shows the parameters pertinent to a field pumping test for permeability determination. One test well is required, and two observation wells are needed, both within the drawdown curve and at different radial distances from the test well. The test well is pumped at some constant rate until equilibrium elevations are attained in the observation wells. Field measurements of Q, ri, r2, hi, and h2 are taken. Permeability is computed from... 

As we wanted to determine whether large-scale barriers to flow might have influenced the compositional distribution of formation waters, we evaluated two sets of data formation water analyses and formation pressure data. Regional differences in formation pressure from one locality to another can be maintained by the presence of barriers to flow (e.g. Cayley 1987). Also, previous studies have shown that interpretation of formation water composition data can be used to identify such barriers. For example, Sr/ Sr RSA can be interpreted for this purpose on a well/field scale (e.g. Smalley et al. 1992 Smalley England 1994 Mearns McBride... 

Boyd RA (2000) Herbicides and herbicide degradates in shallow groundwater and the Cedar River near a mimicipal well field. Cedar Rapids, Iowa. Sci Total Environ 248(2/3) 241-253... 

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