NJ Ambient Groundwater Quality Monitoring Network, Nutrients, 2020-2022

This update (2024) includes the nutrients data from the 6th sampling cycle (2020-2022) of the New Jersey Ambient Groundwater Quality Monitoring Network (AGWQMN). Nutrients are chemical elements and compounds found in the environment that plants and animals need to grow. These constituents generally occur at low concentrations under natural conditions but can be elevated where agrochemicals and lawn fertilizers are used and where septic discharge occurs. Nutrients analyzed in the Ambient Ground Water Quality Monitoring Network include: Nitrogen, Ammonia Dissolved as N; Nitrogen, Nitrite Dissolved as N; Nitrogen, Ammonia Organic Dissolved as N; Nitrogen, Nitrite + Nitrate Dissolved as N, and Orthophosphate Dissolved as P. Samples were analyzed using United States Geological Survey (USGS) National Water Quality Laboratory (NWQL) Schedule 25, Nutrients. Concentrations are reported in milligrams per liter (mg/L). New Jersey's AGWQMN is a cooperative program between the New Jersey Department of Environmental Protection (NJDEP) and United States Geological Survey (USGS). The goals of the current network are to determine the status and trends of shallow groundwater quality as a function of land use related to non-point source pollution in New Jersey. This network consists of 150 monitoring wells screened at the water table. Thirty of these wells were sampled per year on a 5 year cycle from 1999-2013. Beginning with the 4th sampling cycle in 2014, the sampling frequency was changed to once every 3 years (3-year cycle). This layer includes data from sampling cycle 6; samples were collected between 2020 and 2022. The New Jersey Geological and Water Survey (NJGWS) manages the network design, well installation, well maintenance, data interpretation, reporting, and a portion of the well sampling. The NJDEP Bureau of Fresh Water and Biological Monitoring and the United States Geological Survey (USGS) collect the remaining ground-water samples and the USGS National Water Quality Laboratory in Denver, Colorado or their contracted laboratories analyzes them. Chemical and physical parameters analyzed at each well include field parameters such as pH, specific conductance, dissolved oxygen, water temperature and alkalinity, major ions, trace elements (metals), gross-alpha particle activity (radionuclides), volatile organic compounds, nutrients, and pesticides.本次2024年更新的数据包含新泽西州环境地下水质量监测网络（New Jersey Ambient Groundwater Quality Monitoring Network, AGWQMN）第6次采样周期（2020-2022年）的营养物监测数据。 营养物是环境中存在的、动植物生长所必需的化学元素与化合物。此类组分在自然条件下通常处于低浓度水平，但在施用农用化学品、草坪肥料以及化粪池排放的区域，其浓度可能升高。 该监测网络分析的营养物包括：以氮计的溶解氨氮、以氮计的亚硝酸盐氮、以氮计的溶解性有机氨氮、以氮计的亚硝酸盐+硝酸盐氮，以及以磷计的正磷酸盐。 样品分析采用美国地质调查局（United States Geological Survey, USGS）国家水质实验室（National Water Quality Laboratory, NWQL）的第25号营养物分析规程。浓度单位为毫克每升（mg/L）。 新泽西州环境地下水质量监测网络是新泽西州环境保护部（New Jersey Department of Environmental Protection, NJDEP）与美国地质调查局（USGS）的合作项目。本监测网络的运行目标为，针对新泽西州与面源污染相关的土地利用类型，探明浅层地下水水质的现状及变化趋势。 该网络共布设150眼潜水面监测井。1999年至2013年间，每年选取其中30眼井开展采样，采样周期为5年。自2014年第4次采样周期起，采样频率调整为每3年一次（3年周期）。 本数据集包含第6次采样周期的数据，采样时段为2020年至2022年。新泽西州地质与水文调查局（New Jersey Geological and Water Survey, NJGWS）负责监测网络的设计、井体安装与维护、数据解译、报告编制以及部分采样工作。剩余地下水样品由新泽西州环境保护部淡水与生物监测局与美国地质调查局（USGS）采集，样品分析由位于科罗拉多州丹佛市的USGS国家水质实验室或其签约实验室完成。 每眼监测井的分析测试参数涵盖化学与物理两类指标：现场参数包括pH值、电导率、溶解氧、水温与碱度；此外还包括主要离子、微量元素（金属）、总α粒子活度（放射性核素）、挥发性有机物、营养物以及农药。