WORK PLANS - Laserfiche WebLink

Home Browse Search

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 Sofinst 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 i • Consolidated Boreholes (Bedrock) narrow 1/4" (6 mm) tapeare mounted on a convenient small Zones may be isolated with: reel. A narrower Model 102 coaxial cable Water Level Meter a) Double-Actino Packers for 3" (75 mm) diameter or larger may be easierfor use in deeper CMT Systems. boreholes - - "I b) Sand and bentonite lavedrig, tremied or injected C) Pre-formed Bentonite Packers for 3" (75 mm) diameter or larger boreholes s Uncnnsolidated Sediments (Overburden) .� Install the CMT System: so a) using sediment aollanse 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 casino or hollow stem augers: Solinst #410 Peristaltic Pump - using sand and bentonite layering, tremied or injected An accurate 114 " (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 lnertiat 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 tubing is available in lengths of 100' , 200' & 300' (30m, y—x 60m and 90m). If deeper multilevels me desired the Waterloo . - .' Multilevel System can be considered. (See Data Sheet 401 .) The 1 . 7" O.D. CMT tubing (43.2 t, mm) has 7 channels. Although not 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. .4 .support stand eases The fully prepared CMTWhen a CMT System is to be the preparation of ports. System is lowered into �k'^� ti installed throucth narrowdiameter the hole. a direct push eautpmen[ using direct s, 4 burial with formation collapse Typical Installation Procedures r ,�� ", - ., around the system, the port screens ` r The CMT Multilevel be held in place using low is completely built above ground and then i profile clamps. These give an inserted into the borehole. A set of appropriate installation . t* ' overall diameter of 1 . 75" (44.45 tools is available to suit each CMT System. A support stand is mm) tothe 1. 7" system. The eeommendedTo-holdfi#re-tubing�tra-comment position-while- -regu ar camps givl a 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 packers 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 than be lowered into the hole. Double- Pre-packed sand hacks are ed out is lay ed Acting Packers are inflated or time is given to allow Pre-formed CMT tubing on the ground or plastic available with different sizes of - Bentonite Packers to expand, and monitoring can begin as 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. J High Ouatity Groundwater Monitoring Instrumentation sohnst