Multilevel Drive-Point Piezometer
Solinst has been manufacturing high quality stainless steel Drive-Point Piezometers with single monitoring points for years, and in 2021 developed the Model 615ML Multilevel Drive-Point Piezometer. Stainless steel monitoring ports are connected using 3/4" NPT steel drive pipe and couplings. Dual barb stems allow the connection of 3/8" OD (9.5 mm) or 1/4" OD (6 mm) tubing to create up to 3 or 6 monitoring zones, respectively. Drive-Point Multilevel Systems require very few tools to construct and can be installed simply using direct push methods, including a manual slide hammer. These systems are easy to transport with portable sampling and level monitoring options.
The CMT® Multilevel System
Since 1999, Solinst has manufactured the Model 403 CMT Multilevel System. CMT consists of continuously extruded polyethylene tubing with seven or three separate channels running its length. Monitoring zones are mechanically created and sealed off, one in each separate channel at different vertical intervals. CMT offers in-field design flexibility, is low cost and easy to install. The number of monitoring ports, port locations, install depths, and monitoring strategy, can all be accommodated and finalized on site. The 7-Channel System is 1.7" (43 mm) and the 3-Channel is 1.1" (28 mm). They are ideal for shallow applications in narrow diameter boreholes.
The Waterloo Multilevel Groundwater Monitoring System
Solinst has manufactured the Model 401 Waterloo Multilevel System since 1984. The System uses modular components of various casing lengths, sampling ports, and optional packers that are connected to form a sealed casing string. This design gives excellent flexibility, allowing placement of ports and packers to suit borehole logs. Pumps and/or transducers can be dedicated to each port. All instrument tubing and cabling is contained within these modules and collected at the top of the system at a wellhead manifold. The Waterloo System is ideal for long-term monitoring in bedrock and cased boreholes, and has been used to depths of 1000 ft. (300 m).
| Multilevel Drive-Point Piezometer | CMT System | Waterloo System | |
|---|---|---|---|
| Ideal Depth | 3 ft – 20 ft (1 m – 6 m) |
20 ft – 150 ft (6 m – 50 m) |
100 ft – 1000 ft (30 m – 300 m) |
| System Diameter | 3/4" (19 mm) ID | 7-Channel: 1.7" (43 mm) OD 3-Channel: 1.1" (28 mm) OD |
2" (50 mm) OD |
| Typical Installations | |||
| Overburden | 3/4" (19 mm) ID installation with direct push or manual slide hammer | >3.25" (8.3 cm) dia. (direct push, hollow stem auger, sonic drilling) | >5" (12.5 cm) dia. |
| Bedrock | n/a | >3.25" (8.3 cm) dia. | 3" (7.6 cm) to 4" (10 cm) dia. |
| Isolating Zones | |||
| Engineered Packers | n/a | 3-Channel | |
| Layers of Sand and Bentonite | n/a | ||
| Direct Burial | n/a | ||
| Max # of Sampling Zones | 6 | 7 | 24 |
| Soil Gas Monitoring | |||
| Measuring Depth to Water | |||
| <20 ft (6 m) below ground | 102 Water Level Meter | 102 Water Level Meter | 102 Water Level Meter |
| >20 ft (6 m) below ground | n/a | 102 Water Level Meter | 102 Water Level Meter or Pressure Transducer |
| Groundwater Sampling | |||
| Dedicated | n/a |
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| Portable |
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