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ZYJ Dedicated Sampling Pumps Dedicated Transducers Dedicated equipment reduces the time and effort required Dedicated pressure transducers allow rapid and accurate to obtain data, as equipment is not lowered down the measurement of water pressure. Unless static water levels borehole and purge volumes are reduced. It gives significant are shallow, transducers are the preferred method of cost savings and avoids cross contamination. water level measurement,both from an efficiency and an For long term or frequent sampling Waterloo Systems accuracy point of view. most commonly use the gas drive, Solinst Double Valve The transducers chosen for use in the Waterloo System Pumps with stainless steel and Teflon*valves. A are vibrating wire transducers, which are very accurate pump is connected directly to the stem of each and rugged. They have superior long term operation with port and dual line polyethylene or Teflon tubing minimal drift over time. They can be read with a manual connects the pump to the wellhead manifold. readout, or with a datalogger which can provide remote, Both automatic and manual pump control units unattended monitoring and telemetry, if desired. are simple to use. They have quick-connect Transducers are available with pressure ranges from couplings with only a single connection to the 50 psi to 500 psi. (7.25 kPa to 72.5 kPa)and include a manifold required. Samples from all levels are thermister for temperature measurement. easily and rapidly obtained. Purging from some ` or all levels simultaneously is accommodated by the multi-purge feature of the manifold. An option is to use the inexpensive positive displacement,gas drive Single Valve Pump. A check ball of appropriate size is dropped into ani/// open monitoring tube,and a second smaller tube ` is pushed co-axially into the monitoring tube. ^` When this is pressurized,the check ball is forced down,to w" ' close the inlet, and the water is pushed to the surface. Single Valve Pumps enable each open monitoring tube to be used to obtain water level measurements manually. 2 4 Portable Monitoring Equipment ., f Water level measurements can be made in Waterloo ports s: fitted with an open tube using the narrow, Solinst Model 102/P3 Water Level Meter. It has a weighted, flexible probe. 1/4" OD by 4" long (6.35mm x 101mm). Sampling may be performed in open tubes using the Solinst Model 402 Triple Tube Sampler. a 3/8" (10mm) Madel#402 WaTerra footvalve, or a Peristaltic Pump. Model#102/P3 Triple Tuhc Sampler •�w Low Flow Purging and Sampling Purge volumes are very small due to the small annular space and tubing diameters used in the system. , •r,`,�€, Consequently sampling is rapid, even though flows are low, especially with dedicated pumps when all zones can . be purged simultaneously. The 5/8"(16mm)diameter Solinst Double Valve Pump is t �� ideal for use when low flow sampling and purging techniques are desired. ''pilon i.a rrgntrrad ua.k-m.A o1 the Dupont Corporation. High Quality Groundwater Monitoring /nstrunietits `. i Rr.1iY. L