What is a monitoring well?
DEFINITION. A well designed and installed to obtain representative groundwater quality samples and hydrogeologic information. PURPOSE. To provide controlled access for sampling groundwater near an agricultural waste storage or treatment facility to detect seepage and monitor groundwater quality.
What is upgradient vs downgradient?
Downgradient wells are sited to detect impacts from the nearest coal ash disposal area, while upgradient wells are (typically) sited to reflect “natural” or “background” groundwater conditions.
What is Downgradient?
Downgradient means in the direction of the flow of groundwater in the aquifer. “
Why does water flow up a monitoring well?
The primary function of ground water monitoring wells is to provide subsurface access for the measurement of liquid levels and the collection of liquid samples for analysis.
How are monitoring wells constructed?
Temporary groundwater monitoring wells or sampling points are generally installed in boreholes driven by direct push technology (DPT). After completion of the borehole, a well casing consisting of a solid riser, well screen, and bottom cap is inserted into the borehole. A filter pack may or may not be installed.
What is a Type III monitoring well?
The Type III monitoring well (DW-1) outer casing was constructed to a depth of 42 feet bls. DW-1 was advanced to a depth of 57 feet bls and constructed of 2-inch diameter slotted Schedule 40 PVC well screen from the base of the borehole to 52 feet bls followed by Schedule 40 PVC riser to land surface.
What direction does water flow in an aquifer?
Water moves underground downward and sideways, in great quantities, due to gravity and pressure. Eventually it emerges back to the land surface, into rivers, and into the oceans to keep the water cycle going.
What is a downgradient well?
(hydrology) a location that receives groundwater from another location; similar to downstream. Monitoring wells are installed downgradient of a contamination source to detect a contaminant plume.
What is the difference between a piezometer and a groundwater monitoring well?
Difference Between Piezometers vs. Monitoring Wells The major different between the two is how far along the pipe water is entered. A monitoring well provides the water to go through most of the length of the pipe, while the piezometers allow it to flow only at the bottom of the pipe.
What is the purpose of groundwater monitoring wells?
Typical groundwater monitoring wells are used to enhance environmental protection at landfills. WM has stringent standards, policies, and procedures in place to ensure that a high level of consistency and quality is built into each monitoring location.
How are monitoring wells installed?
What controls groundwater flow?
Topography and geology are the dominant factors controlling groundwater flow. Storativity describes the property of an aquifer to store water. Hydraulic conductivity is measured by performing a pumping test, i.e. by pumping one well and observing the changes in hydraulic head in neighboring wells.
Which is the best definition of the term upgradient?
upgradient (comparative more upgradient, superlative most upgradient) A position up along a gradient from a starting position. (hydrology) a location that is the source groundwater for another location; similar to upstream. Uncontaminated groundwater is found upgradient of a contamination source.
Which is an example of an upgradient in hydrology?
A position up along a gradient from a starting position. (hydrology) a location that is the source groundwater for another location; similar to upstream. Uncontaminated groundwater is found upgradient of a contamination source.
Which is an upgradient of a contamination source?
Uncontaminated groundwater is found upgradient of a contamination source. The reverse direction along a gradient. ( hydrology) a direction that groundwater flows from.
What is the up gradient of a WWTF pond?
Up-gradient of WWTF, the groundwater gradient is relative flat (approximately 0.001 feet/foot); Down-gradient of the WWTF ponds, the gradient steepens to approximately 0.02 to 0.03 feet/foot.