Index: Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.IO/DuneLocationsReader.cs
===================================================================
diff -u -rac96d7c315129af851634ed5a4a6800b59ede718 -r5b1b0a2b698e20d3972e2a8f511b4f49dc1cfcd0
--- Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.IO/DuneLocationsReader.cs	(.../DuneLocationsReader.cs)	(revision ac96d7c315129af851634ed5a4a6800b59ede718)
+++ Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.IO/DuneLocationsReader.cs	(.../DuneLocationsReader.cs)	(revision 5b1b0a2b698e20d3972e2a8f511b4f49dc1cfcd0)
@@ -59,11 +59,14 @@
             {
                 string filePath = Path.Combine(embeddedResourceFileWriter.TargetFolderPath, "RSPstelsel.shp");
 
+                var readDuneLocations = new List<ReadDuneLocation>();
                 using (var pointShapeReader = new PointShapeFileReader(filePath))
                 {
                     FeatureBasedMapData locationsData = pointShapeReader.ReadShapeFile();
-                    return CreateDuneLocations(locationsData);
+                    readDuneLocations.AddRange(CreateDuneLocations(locationsData));
                 }
+
+                return readDuneLocations;
             }
         }
 
Index: Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Plugin/Handlers/DuneLocationsReplacementHandler.cs
===================================================================
diff -u -re57e79927485e44d681b0617f17bada42dbfb862 -r5b1b0a2b698e20d3972e2a8f511b4f49dc1cfcd0
--- Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Plugin/Handlers/DuneLocationsReplacementHandler.cs	(.../DuneLocationsReplacementHandler.cs)	(revision e57e79927485e44d681b0617f17bada42dbfb862)
+++ Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Plugin/Handlers/DuneLocationsReplacementHandler.cs	(.../DuneLocationsReplacementHandler.cs)	(revision 5b1b0a2b698e20d3972e2a8f511b4f49dc1cfcd0)
@@ -37,6 +37,7 @@
     {
         private readonly IViewCommands viewCommands;
         private readonly DuneErosionFailureMechanism failureMechanism;
+        private readonly DuneLocationsReader duneLocationsReader;
 
         /// <summary>
         /// Creates a new instance of <see cref="DuneLocationsReplacementHandler"/>.
@@ -58,6 +59,8 @@
 
             this.viewCommands = viewCommands;
             this.failureMechanism = failureMechanism;
+
+            duneLocationsReader = new DuneLocationsReader();
         }
 
         /// <summary>
@@ -69,8 +72,7 @@
         /// is <c>null</c>.</exception>
         public void Replace(HydraulicBoundaryLocation[] newHydraulicBoundaryLocations)
         {
-            var duneLocationsReader = new DuneLocationsReader();
-            IEnumerable<ReadDuneLocation> newDuneLocations = duneLocationsReader.ReadDuneLocations().ToArray();
+            IEnumerable<ReadDuneLocation> newDuneLocations = duneLocationsReader.ReadDuneLocations();
 
             DuneErosionDataSynchronizationService.SetDuneLocations(failureMechanism,
                                                                    newHydraulicBoundaryLocations,