NJDEP PFAS Soil Survey for New Jersey

Excel Data Download From August 2023 to December 2023, NJDEP collected 157 soil samples throughout New Jersey’s 21 counties. Samples were collected from publicly accessible land (e.g., state, county, municipal parks) and were split between urban (n = 83) and rural (n = 74) areas based on the 2020 United States Census definition (U.S. Census Bureau, 2022). No samples were collected from locations with a history of agricultural use dating back to 1940 to avoid potential PFAS contamination from biosolids application. In addition, all samples were collected from locations spatially distant from known sources of PFAS contamination or presumptive sources of potential PFAS contamination with the goal of avoiding locations that may have been impacted by a direct PFAS discharge. Collected samples were analyzed for 40 PFAS compounds using EPA method 1633. Only compounds detected in each sample are labeled. Any compound reported as non-detect by the laboratory was replaced with ½ the Method Detection Limit (MDL) for the specific sample. A qualifier field was generated for each individual PFAS compound indicating whether the result was non-detect. Y indicates that the result was non-detect and that the value in the corresponding field is ½ the MDL. N indicates the compound was detected and the value is reported in the corresponding field. ½ the MDL was used for the purpose of this study and is not intended for remediation purposes. This study utilized a value of ½ of the Method Detection Limit (MDL) to represent Non-Detects in data sets for statistical and mapping purposes. Please note the use of ½ of the MDL is limited to this study and should not be used to represent Non-Detect values in compliance averaging calculations where ½ of the Report Limit is specified as per the Technical Guidance for the Attainment of Remediation Standards and Site-Specific Criteria (see Appendix C).本数据集为2023年8月至12月期间导出的Excel数据，新泽西州环境保护部（New Jersey Department of Environmental Protection, NJDEP）在新泽西州21个郡县范围内共采集157份土壤样本。样本采集自公共开放用地，例如州立、郡县及市级公园，并依据2020年美国人口普查（U.S. Census Bureau, 2022）的定义，将采样点位划分为城区（n = 83）与郊区（n = 74）两类。为规避生物固体施用带来的全氟和多氟烷基物质（Per- and Polyfluoroalkyl Substances, PFAS）潜在污染，未在1940年以来存在农业使用历史的区域采集样本。此外，所有样本均采集于空间上远离已知全氟和多氟烷基物质（PFAS）污染源或疑似潜在污染源的点位，以避免受到全氟和多氟烷基物质直接排放的影响。采集的样本采用美国环境保护署（U.S. Environmental Protection Agency, EPA）方法1633，针对40种全氟和多氟烷基物质（PFAS）开展分析。仅在单份样本中检出的化合物会被标注。实验室报告为未检出的化合物，其数值将替换为对应样本的方法检测限（Method Detection Limit, MDL）的1/2。研究为每种全氟和多氟烷基物质（PFAS）生成了标识字段，用于说明检测结果是否为未检出：Y代表结果为未检出，对应字段中的数值为方法检测限（MDL）的1/2；N代表该化合物已被检出，对应字段中的数值为实际检测结果。本研究采用方法检测限（MDL）的1/2来代表未检出结果，该处理方式仅用于本次研究，不适用于修复相关用途。为满足统计分析与绘图需求，本数据集以方法检测限（MDL）的1/2作为未检出值的替代数值。请注意，本研究中采用的1/2 MDL处理方式仅适用于本次研究，在合规平均值计算中，需按照《修复标准与场地特定标准达成技术指南》（参见附录C）的要求，使用1/2报告限作为未检出值的替代，因此本研究的处理方式不可直接套用至此类合规计算场景。