Sampling Cap Seal Highest Seasonal Groundwater Level Lowest Seasonal Groundwater Level Bottom Cap Protection Post Concrete Pad Soil Soil Seal Monitoring Well Depth Varies. Weep Hole Varies Slotted Casing Typical Groundwater Monitoring Well Protective Surface Casing Gravel Typical groundwater monitoring wells are used to enhance environmental protection at landfills. WM has stringent standards, policies, and procedures in place to ensure that a high level of consistency and quality is built into each monitoring location. Samples are collected routinely at permit-specified time intervals, and analyzed by state approved and qualified independent laboratories. The lab results are evaluated and then sent to local or state regulatory agencies for review. This process allows potential environmental concerns to be identified early, and aggressively evaluated and corrected (when necessary) in accordance with regulations and sound scientific approaches. © 2003, Waste Management www.wm.com From everyday collection to environmental protection, Think Green. SM Think Waste Management. (Not to scale)