Frequently asked questions application granulite Saskerleidam

The Recreatieschap Alkmaarder- en Uitgeestermeer (RAUM) is currently carrying out a project in the Alkmaardermeer at the Saskerleidam. HHNK has granted a permit for the application of granulite to construct the core of the dam. Below you will find frequently asked questions and answers. For more information about the project, visit the RAUM website: Bank and nature development Saskerleidam - Projects - Alkmaarder and Uitgeestermeer. 

Why does HHNK allow the use of granulate? 

When assessing the permit application, HHNK required the applicant to have the granulate tested for the presence of (poly)acrylamide before it may be used in the Alkmaardermeer. The test showed that the amount of polyacrylamide is so low that it is not measurable. The fact that it has not been analytically demonstrated gives the water board sufficient certainty that the use of granulate will not lead to contamination of the surface water with acrylamide. The granulate is also free of PFAS. In all other quality aspects, the material is clean and meets the highest quality class. The granulate for the Saskerleidam is therefore of a quality that can be freely used on land and in surface water. 

Can the work continue? 

Yes, the permit for this was issued by HHNK. We supervise the work. The project is also part of the WFD (Water Framework Directive) objectives to be achieved. HHNK therefore also has an interest in the clean material and that the work is carried out properly. 

Does HHNK measure whether acrylamide is released into the water? 

No, we only take water samples if we have reason to do so. Because we have already had the granulate sampled in advance and nothing was found, this is not necessary.  

How is the granulate prevented from spreading throughout the lake? 

The work with granulate concerns the construction of the dam. The dam will eventually also be covered with clay and a grass mat, which will also cover the granulate. 

Will the entire expansion of Saskerleidameiland be made of granulate? 

No, granulate is only used in the dam on the outside of the section to be expanded. The section behind the dam is filled with dredged material from the area, largely from the Uitgeester- and Alkmaardermeer itself. The water board and the recreation board are still in consultation about this. Here too, we test the dredged material against the applicable legislation and the WFD objectives to be achieved. The water quality must never deteriorate, only improve.