Jeths R2012-12-122012-12-121992-12-31http://hdl.handle.net/10029/258916Abstract niet beschikbaarThe Dutch groundwater quality monitoring network includes 390 monitoring points. The frequency of sampling is once a year. The objectives of the network are: - to make an inventory of the present quality in relation to soil use, type of soil and hydrogeological conditions; - to distinguish long term changes in quality; - to provide data for quality control and groundwater control; - to indicate the extent of human influence on groundwater quality. This report gives the results of analysis in 1991 from 25 monitoring points in the province of Noord-Holland.31 pnl13grondwaterkwaliteitverontreinigingmeetnetmonitoringgrondsoortmeetgegevensnoord-holland92-4national groundwater quality;groundwaterqualitypollutionmonitoring networkssoil typesdatanoord-hollandReport2012-12-12