Earthen manure storage (EMS) facilities no longer in operation present a risk to the environment, and there is limited guidance to support the planning and implementation of EMS closures. A combined dairy and feedlot in southern Alberta, Canada, had an EMS in operation for about 55 yr. The dairy portion ceased operation in 2015 and the EMS was emptied; however, no specific steps for permanent closure to minimize possible contamination were followed. The objective of this study was to document changes in shallow groundwater quality following an EMS closure. This EMS was already instrumented to assess its effect on the groundwater quality as part of a long-term study prior to closure. Eight groundwater monitoring wells were installed 2 to 38 m from the EMS in up- and down-gradient positions in 2010 and 2011. Groundwater samples were collected about three times annually prior to and also for 4 years after the EMS closure and were analyzed for NO3 -N, NH3 -N, and Cl. Wells screened at more than 8 m deep where not affected by the EMS prior to or after closure. However, in shallower wells, groundwater NO3 -N concentration increased to a maximum three years after closure (in 2018), and then decreased afterwards. In a shallow well 40 m down-gradient from the EMS, the NO3 -N concentrations decreased from 31 mg L-1 in 2015 to 5 mg L-1 in 2019 and the chloride concentration decreased from 64 to 53 mg L-1 , suggesting the contamination plume had dispersed. However, the EMS was still a source of contamination as high concentrations of NO3 -N (0.05-40 mg L-1 ) and Cl (43-862 mg L-1 ) was present in wells immediately next to the EMS 4 years after closure. This article is protected by copyright. All rights reserved.

中文翻译：

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艾伯塔省南部一个土肥库 (EMS) 关闭后地下水中的氮和氯化物

不再运行的土肥储存 (EMS) 设施对环境构成风险，并且支持 EMS 关闭的规划和实施的指导有限。位于加拿大艾伯塔省南部的一家联合乳制品和饲养场的 EMS 运行了大约 55 年。乳品部分于 2015 年停止运营，EMS 清空；然而，没有遵循永久关闭的具体步骤以尽量减少可能的污染。本研究的目的是记录 EMS 关闭后浅层地下水质量的变化。作为关闭前长期研究的一部分，该 EMS 已经用于评估其对地下水质量的影响。2010 年和 2011 年，在距 EMS 2 至 38 m 的上坡和下坡位置安装了 8 口地下水监测井。在 EMS 关闭之前和之后的 4 年内，每年大约收集 3 次地下水样本，并分析 NO3 -N、NH3 -N 和 Cl。在关闭前或关闭后不受 EMS 影响的深度超过 8 m 的井进行筛选。然而，在较浅的井中，地下水 NO3 -N 浓度在关闭三年后（2018 年）增加到最大值，然后下降。在距EMS下降40 m的浅井中，NO3 -N浓度从2015年的31 mg L-1下降到2019年的5 mg L-1，氯化物浓度从64 mg L-1下降到53 mg L-1，表明污染羽流已经散去。然而，EMS 仍然是一个污染源，因为在关闭 4 年后紧邻 EMS 的井中存在高浓度的 NO3 -N (0.05-40 mg L-1 ) 和 Cl (43-862 mg L-1 ) . 本文受版权保护。版权所有。