Well Location And Number

The selection of the proper number and locations of monitoring wells is obviously one of the most important decisions in any groundwater monitoring program or ground-water remedial investigation. For monitoring purposes, most guidances suggest a minimum of four monitoring wells per potential source of groundwater contamination (U.S. EPA 1986). Three of these wells are placed down-gradient of the potential source, and one is placed upgra-dient. The purpose of these wells is to provide information on the background quality of the groundwater riocieciive covei

With Locking Cap

6 in (152 mm) Clearance For Sam

Slope Bentonite/Soil Mixture or 4 in (101 mm) Thick Concrete Pad Away From Casing

Slope Grout Away From Casing or Riser To Prevent Infliltration, But Do Not Create a Mushroom For Grout Which Will Be Subject To Frost Heave

Well Identification Labeled Inside and Outside The Cap

6 in (152 mm) Clearance For Sam

Slope Bentonite/Soil Mixture or 4 in (101 mm) Thick Concrete Pad Away From Casing

Slope Grout Away From Casing or Riser To Prevent Infliltration, But Do Not Create a Mushroom For Grout Which Will Be Subject To Frost Heave

Dry Bentonite Pellets

Centralizers As Necessary

3 ft - 5ft (1.0 to 1.5 m) Extend Protective Casing Depth To Below Frost Line

Grout Length Varies

Centralizer(s) As Necessary

Plug

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