Perforated Monitoring Installation Guide235

Introduction

Perforated monitoring is a type of well monitoring that uses a perforated pipe or casing to allow water to enter the well from the surrounding aquifer. Perforated monitoring wells are typically used to collect groundwater samples for analysis or to monitor groundwater levels. This guide will provide you with step-by-step instructions on how to install a perforated monitoring well.

Materials

- Perforated pipe or casing
- Well screen (optional)
- Gravel pack
- Bentonite seal
- Grout
- Well capSteps

1. Drill the well

The first step is to drill the well to the desired depth. The diameter of the well will depend on the size of the perforated pipe or casing that you will be using.
2. Install the perforated pipe or casing

Once the well has been drilled, you need to install the perforated pipe or casing. The perforated pipe or casing should be long enough to extend from the bottom of the well to a few feet above the ground surface.
3. Install the well screen (optional)

If you are using a well screen, you will need to install it on the bottom of the perforated pipe or casing. The well screen will help to keep sediment out of the well.
4. Pack the well with gravel

Once the perforated pipe or casing has been installed, you need to pack the well with gravel. The gravel pack will help to keep the well from collapsing and will also allow water to flow into the well from the surrounding aquifer.
5. Install the bentonite seal

Once the well has been packed with gravel, you need to install a bentonite seal. The bentonite seal will help to prevent water from flowing into the well from the surface.
6. Grout the well

Once the bentonite seal has been installed, you need to grout the well. The grout will help to seal the well and prevent water from leaking out of the well.
7. Install the well cap

Once the grout has set, you need to install the well cap. The well cap will help to protect the well from the elements and will also prevent unauthorized access to the well.

Tips

- When selecting a perforated pipe or casing, it is important to choose one that has the appropriate diameter and perforation size. The diameter of the pipe or casing should be large enough to allow water to flow into the well, but small enough to prevent sediment from entering the well. The perforation size should be small enough to prevent sediment from entering the well, but large enough to allow water to flow into the well.
- When installing the well screen, it is important to make sure that the screen is properly seated on the bottom of the perforated pipe or casing. If the screen is not properly seated, water may be able to bypass the screen and enter the well.
- When packing the well with gravel, it is important to use a clean, well-graded gravel. The gravel should be free of sediment and should be of a size that will allow water to flow through it easily.
- When installing the bentonite seal, it is important to use a bentonite that is specifically designed for well sealing. The bentonite should be mixed with water to form a slurry that is thick enough to prevent water from flowing through it.
- When grouting the well, it is important to use a grout that is specifically designed for well grouting. The grout should be mixed with water to form a slurry that is thick enough to fill the annular space between the perforated pipe or casing and the borehole.
- When installing the well cap, it is important to make sure that the cap is properly sealed. If the cap is not properly sealed, water may be able to enter the well from the surface.

2024-11-20

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