Regulatory agencies usually require the installation and development of at least three specially designed groundwater monitoring wells surrounding a proposed disposal area, at locations selected based on the upgradient (one) and downgradient (two) hydrologic gradient. Sometimes it is necessary or desirable to install additional small diameter piezometers for water level monitoring beneath proposed reserve areas and elsewhere across a site. The wells and piezometers usually need to be sampled for certain baseline water quality parameters and gauged to form the basis of water table contour maps. When groundwater is deep, long-term groundwater level monitoring may not be unnecessary. The observation of shallow groundwater levels, and/or unusually low slug test results, could mandate long-term groundwater monitoring as an additional investigative measure.
Representative professional services performed by ALWI's wastewater division include the following: