Section 19.118 - Ground Water, Surface Water and Gas Monitoring Systems(1)General Performance Standard. Any person conducting landfill activities shall install, operate and maintain a ground water monitoring system, surface water monitoring system and landfill gas monitoring system capable of detecting and quantifying the release of contaminants into the ground, ground water, surface water or the air.(2)Ground Water Monitoring Systems.(a)Performance Standard. A ground water monitoring system shall:1. be capable of yielding representative ground water samples for analysis; and2. consist of a sufficient number of wells properly located and screened at appropriate depths to detect the release of contaminants from the landfill into the ground water.(b)Design Standards. A ground water monitoring system shall: 1. at a minimum be composed of one monitoring well or cluster of wells installed hydraulically upgradient from the limit of the filled or proposed fill area capable of yielding ground water samples which are representative of background ground water quality;2. at a minimum be composed of three monitoring wells, or clusters of wells, installed within 150 meters of filled areas proposed to be filled or at the property boundary, whichever is less, and located hydraulically downgradient from the limit of the filled areas or areas proposed to be filled and capable of detecting contaminants that migrate from the landfill to the ground water.3. be composed of wells drilled by a person licensed under Well Driller Regulations, 313 CMR 3.00:4. be composed of wells constructed in a manner, approved by the Department, that ensures the integrity of the monitoring well and facilitates the collection of samples;5. be composed of wells readily accessible to sampling equipment and located so that they do not interfere with routine facility operations; and6. be composed of wells designed with locking caps and secured to prevent tampering with or vandalism.(3)Surface Water Monitoring Systems(a)Performance Standard. Where required by the Department, permanent surface water sampling location markers shall be established upstream and downstream of the solid waste landfill facility in sufficient numbers and locations to adequately represent surface waters flowing through or past the facility.(b)Design Standard. All surface water sampling locations shall be readily accessible to sampling equipment and located so that they do not interfere with routine facility operations.(4)Gas Monitoring Systems(a)Performance Standard. Gas monitoring wells for the monitoring of explosive and other landfill gases shall be provided at all landfills to determine if gas is migrating beyond the boundaries of the landfill and shall:1. be capable of yielding representative air samples for analysis; and2. consist of a sufficient number of wells properly located to detect the presence and migration of landfill gases.