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(2)Implementation of revised programs. Owners or operators must implement the revised water quality monitoring program during the first sampling round after the revised program is approved. Revised waste characterization programs must be implemented within 30 days of approval.

D.Laboratory Certification. Laboratory analyses required in support of the licensing, operation, closure, post-closure, assessment or remediation of a solid waste facility or activity must be performed by a laboratory certified by State of Maine, Department of Health and Human Services in accordance with 22 M.R.S. § 567 and the Maine Comprehensive and Limited Environmental Laboratory Certification Rules, 10-144 CMR 263. Unless otherwise exempted from certification, all laboratories performing analyses to demonstrate compliance with Department programs must be certified for all reported analyses performed for which certification is required. Required certifications must be in place and valid at the time analyses are performed.

2.Water Quality Monitoring. The monitoring program approved for a solid waste facility must be capable of detecting any changes in ground water quality in the vicinity of the solid waste facility and/or any changes in surface water quality in the vicinity of the solid waste facility.

A.Standards for Ground Water Monitoring. The objective of a ground water monitoring program is to detect changes in the quality of ground water due to a solid waste facility. To accomplish this, downgradient and upgradient (or background) ground water monitoring wells must be placed in sufficient numbers to meet the standards of this chapter as determined through a hydrogeological investigation of the facility site. Areas where public health concerns or nearby sensitive receptors are threatened or have been affected may be subject to more intensive ground water monitoring requirements than provided below.

(1)Number and location of ground water monitoring wells. The number and placement of ground water monitoring wells at new or altered solid waste facilities, or existing active, inactive or closed solid waste facilities required to implement a new ground water quality monitoring program or add additional monitoring wells, must conform to the standards listed below. Where the location of existing active, inactive or closed solid waste facilities (including alterations) make it impossible to locate wells upgradient of the waste handling area, other locations for characterizing background ground water quality may be proposed for review by the Department.

(a)Horizontal well spacing must be based on site-specific conditions including ground water flow direction and rate, estimated dispersion, proximity to sensitive receptors and the nature of wastes disposed of, stored, processed or beneficially used at a solid waste facility. For landfills, it must also be based on the proposed or existing design of the landfill liner and leachate management systems. The number and location of the downgradient monitoring wells or well clusters will depend on the size of the waste handling area and the length of its downgradient perimeter. Monitoring wells must be established in sufficient numbers to detect any contamination emanating from the waste handling area.

(b)Vertical well locations must be chosen to ensure that each hydrogeologic unit is monitored.

(c)At new or expanded landfills, a minimum of two upgradient and three downgradient wells or well cluster locations must be provided. At landfills where more than five wells or well clusters are necessary, the ratio of upgradient (or background) wells to downgradient wells must be sufficient to support valid statistical analyses.

Chapter 405: Water Quality Monitoring, Leachate Monitoring, and Waste Characterization

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