듀크에너지(Duke Energy)는 주에서 14 석탄 플랜트의 노스캐롤라이나의 자연자원환경국(North Carolina Department of Environment and Natural Resources, NCDENR)에 대한 포괄적인 지하수 평가보고를 제출하기 시작했다. 기업과 자연자원환경국은 재 웅덩이(ash basins)로 덮인 지하수를 보호할 지속적인 방법을 결정하기 위해 다른 정보와 함께 과학을 이용한 기술을 사용할 방침이다.

일반적으로 900개의 새로운 모니터링의 설치를 통해 데이터를 수집했으며, 주 전역에서 국가 규제기관에 수년동안 제공한 5천 개 이상의 토양 및 물 표본은 역사적 데이터와 일치한다.

Duke Energy has begun submitting comprehensive groundwater assessments to the North Carolina Department of Environment and Natural Resources (NCDENR) for each of the 14 coal plants in the state. The company and NCDENR will use this science and engineering, along with other information, to determine how best to continue to protect groundwater as ash basins are closed. 

Generally, the data gathered through the installation of about 900 new monitoring wells and more than 5,000 soil and water samples across the state have been consistent with historical data provided to state regulators over many years. The first three assessments address operations at the H.F. Lee Energy Complex (Goldsboro), L.V. Sutton Energy Complex (Wilmington) and W.H. Weatherspoon Plant (Lumberton).

While study continues, the assessments indicate:

- H.F. Lee : Groundwater near ash basins is flowing away from neighbors' private wells. Impacted groundwater has migrated off site in isolated areas where there are no private wells.
- Sutton : The company is addressing off-site groundwater impacts by partnering in 2013 with the local water utility to extend a new municipal water line currently underway and by installing 12 "interceptor" wells that will pump groundwater back to the plant. Private drinking water wells sampled by NCDENR to date show exceedances only for substances that are also naturally occurring and common in the region's soil.
- Weatherspoon : Groundwater near ash basins is flowing away from neighbors' private wells. The area of groundwater impact is confined to the ash basin footprint and the former coal pile area.
- Data demonstrate that water quality in the Cape Fear, Neuse and Lumber rivers has not been affected by ash basin operations.

Comprehensive site assessments for Duke Energy's other 11 North Carolina facilities will be filed with regulators by mid-September, which is consistent with the requirements in the N.C. Coal Ash Management Act. In each case, an overview and executive summaries of these lengthy reports will be posted here.

The next phase of work includes additional sampling and computer modeling in the next 90 days to better understand how groundwater conditions are expected to change over time. Where groundwater impacts need to be addressed, the sampling results and modeling will inform the best engineering solutions to protect groundwater long term.

Duke Energy also has ash excavation in progress at three Carolinas coal plants (Asheville and Riverbend plants in North Carolina and W.S. Lee plant in South Carolina) and recently announced its recommendation to excavate an additional 12 basins in North Carolina for technical reasons unrelated to groundwater. It continues to study remaining basins in the state and will use this groundwater data and modeling to inform effective basin closure recommendations.

[출처 = Water World / 2015년 8월 10일]