NJ Ambient Groundwater Quality Monitoring Network, Volatile Organic Compounds, 2020-2022

This update (2024) includes the volatile organic compound (VOC) data from the 6th sampling cycle (2020-2022) of the New Jersey Ambient Groundwater Quality Monitoring Network (AGWQMN). Volatile Organic Compounds (VOCs) are generally organic chemicals that have a high vapor pressure and readily vaporize at temperatures and pressures normally found at the earth's surface. The term is generally applied to organic solvents, certain paint additives, aerosol spray can propellants, fuels (such as gasoline, and kerosene), petroleum distillates, dry cleaning products and many other industrial and consumer products ranging from office supplies to building materials. VOCs are also naturally emitted by a number of plants and trees. Samples were analyzed using United States Geological Survey (USGS) National Water Quality Laboratory (NWQL) Schedule 1307. Concentrations are reported in micrograms per liter (µg/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年更新数据集，涵盖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）的挥发性有机化合物（Volatile Organic Compounds, VOCs）监测数据。挥发性有机化合物通常指在地球表面常规温压条件下蒸气压高、易挥发的有机化学品，涵盖有机溶剂、部分涂料添加剂、气溶胶喷雾推进剂、燃料（如汽油、煤油）、石油馏分、干洗用品，以及从办公耗材到建筑材料的众多工业与民用消费品。此外，多种陆生植物与乔木也会自然排放VOCs。样本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）1307号分析方案开展检测，浓度单位为微克每升（µg/L）。新泽西州AGWQMN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）联合发起的合作项目。当前监测网络的核心目标为，明确新泽西州受面源污染影响的土地利用类型下，浅层地下水水质的现状与变化趋势。该网络共计布设150眼滤管设于潜水面的监测井。1999—2013年间，每年选取30眼监测井开展采样工作，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1次，即采用3年采样周期。本数据图层涵盖第6次采样周期的监测数据，样本采集时段为2020—2022年。新泽西地质与水文调查局（New Jersey Geological and Water Survey, NJGWS）负责监测网络的设计、井体安装、运维管理、数据解译、报告编制，以及部分采样工作。剩余地下水样本由新泽西州环境保护部淡水与生物监测局，以及美国地质调查局（USGS）负责采集，样本分析工作由位于科罗拉多州丹佛市的USGS国家水质实验室或其签约合作实验室完成。每眼监测井的检测指标涵盖化学与物理参数，其中现场检测参数包括pH值、电导率、溶解氧、水温与碱度，此外还包括主要离子、痕量元素（金属）、总α粒子活度（放射性核素）、挥发性有机化合物、营养盐及农药。