WORK PLANS - Laserfiche WebLink

Home Browse Search

1 • • Solinst ' Installation Overview Monitoring Your CMT Multilevel There are many options for the installation of a CMT System Water levels can be accurately established using the Solinst Mini depending on the lithology and project requirements. Typical 101 Water Level Meter. The Mini 101 is ideal for use in shallow installation options include: CMT Systems. Lengths of 30 ft, 65 ft, 10m or 20m. of the ' • Consolidated Boreholes (Bedrock) narrow 1/4"(6 mm)tape are mounted on a convenient small Zones may be isolated with: reel. A narrower Model 102 coaxial cable Water Level Meter a) Double-Acting Packers for 3"(75 mm)diameter or larger may be easier for use in deeper CMT Systems. boreholes b) Sand and bentonite layering,tremied or injected c) Pre-formed Bentonite Packers for 3"(75 mm)diameter or larger boreholes u, • Unconsolidated Sediments IOverburdenl ' Install the CMT System: a) using sediment collapse around tubing, in collapsing formations using 2" (50 mm)or larger drive casing b) within well casing, with screened intervals at the desired ' monitoring zones,and using options for consolidated holes c) within driven temporary casing or hollow stem augers: Solinst#410 Peristaltic Pump -using sand and bentonite layering, tremied or injected An accurate 1/4"(6mm) -using pre-formed bentonite packers and screens flat tape and probe. ' Temporary casing has the advantage that it avoids redistribution Sampling can be performed using the Solinst Model 410 of soil and contaminants and thus potential positive biases. Air Peristaltic Pump, a small inertial WaTerra Pump, or a single rotary, cable tool, sonic and large direct-push(DP)rigs.can all valve pump. ' be used to advance temporary casing. The smaller sonic and direct-push rigs also offer easy-access advantages. CMT System Sizes The tubino is available in lengths of 100',200'&300' (30m, ' 60m and 90m). If deeper multilevels are desired the Waterloo Multilevel System can be considered. (See Data Sheet 401.) The 1.7" O.D. CMT tubing(43.2 mm)has 7 channels Although not ' r circular, the ID of the 6 outer channels are approximately 7/16" (11mm) and the smaller central channel is 3/8" (9.5mm). The ' tubing coils are approximately 4 ft. (1.22 m)in diameter. A support stand eases The fully prepared CMT When a CMT System is to be the preparation of ports. System is lowered into installed through narrow dialn ete ' the hole. direct push equipment using direct burial with formation collapse Typical Installation Procedures around the system,the port screens can be held in place using low The CMT Multilevel is completely built above ground and then profile clamps. These give an inserted into the borehole. A set of appropriate installation overall diameter of 1.75" (44.45 tools is available to suit each CMT System. A support stand is mm) to the 1.7" system. The recommended to hold the tubing in a convenient position while regular clamps give an overall the ports are drilled and sealed. diameter of 1.9"(48.26 mm)when Installation is simple. After drilling the hole, lay out the CMT packers or sand packs are not used. tubing, mark the zones to be monitored and prepare the port Pre-packed bentonite packers and inlet holes. If packets and/or sand packs are to be used, slip Double-Acting Packers are ' them into position. When sand packs are not to be used, available in a variety of diameters screens are placed over the port inlet holes, to suit different sized holes. The CMT System can then be lowered into the hole. Double- MT tubing is layed out Pre-packed sand packs are Acting Packers are inflated or time is given to allow Pre-formed CMT ground or plastic available with different sizes of ' Bentonite Packers to expand, and monitoring can begin as on sheeting for ports to be screen mesh and different sizes of soon as hydraulic and hydrogeochemical equilibrium has been prepared and placement sand, to suit hydrogeologic re-estabished. ofpackers. conditions. ' High Quality Groundwater Monitoring Instrumentation Solinst