Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs
===================================================================
diff -u -rcc686ef967b8411d7c88a8b93afe614fa936e4b2 -r47a3071db27d6f39d182111938d76a4efdda0f6f
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs	(.../AssessmentSection.cs)	(revision cc686ef967b8411d7c88a8b93afe614fa936e4b2)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs	(.../AssessmentSection.cs)	(revision 47a3071db27d6f39d182111938d76a4efdda0f6f)
@@ -51,15 +51,14 @@
         private const double defaultNorm = 1.0 / 30000;
         private const RingtoetsWellKnownTileSource defaultWellKnownTileSource = RingtoetsWellKnownTileSource.BingAerial;
 
-        private readonly ObservableList<HydraulicBoundaryLocationCalculation> waterLevelCalculationsForFactorizedSignalingNorm = new ObservableList<HydraulicBoundaryLocationCalculation>();
-        private readonly ObservableList<HydraulicBoundaryLocationCalculation> waterLevelCalculationsForSignalingNorm = new ObservableList<HydraulicBoundaryLocationCalculation>();
-        private readonly ObservableList<HydraulicBoundaryLocationCalculation> waterLevelCalculationsForLowerLimitNorm = new ObservableList<HydraulicBoundaryLocationCalculation>();
-        private readonly ObservableList<HydraulicBoundaryLocationCalculation> waterLevelCalculationsForFactorizedLowerLimitNorm = new ObservableList<HydraulicBoundaryLocationCalculation>();
-        private readonly ObservableList<HydraulicBoundaryLocationCalculation> waveHeightCalculationsForFactorizedSignalingNorm = new ObservableList<HydraulicBoundaryLocationCalculation>();
-        private readonly ObservableList<HydraulicBoundaryLocationCalculation> waveHeightCalculationsForSignalingNorm = new ObservableList<HydraulicBoundaryLocationCalculation>();
-        private readonly ObservableList<HydraulicBoundaryLocationCalculation> waveHeightCalculationsForLowerLimitNorm = new ObservableList<HydraulicBoundaryLocationCalculation>();
-        private readonly ObservableList<HydraulicBoundaryLocationCalculation> waveHeightCalculationsForFactorizedLowerLimitNorm = new ObservableList<HydraulicBoundaryLocationCalculation>();
-
+        private readonly IList<HydraulicBoundaryLocationCalculation> waterLevelCalculationsForFactorizedSignalingNorm = new List<HydraulicBoundaryLocationCalculation>();
+        private readonly IList<HydraulicBoundaryLocationCalculation> waterLevelCalculationsForSignalingNorm = new List<HydraulicBoundaryLocationCalculation>();
+        private readonly IList<HydraulicBoundaryLocationCalculation> waterLevelCalculationsForLowerLimitNorm = new List<HydraulicBoundaryLocationCalculation>();
+        private readonly IList<HydraulicBoundaryLocationCalculation> waterLevelCalculationsForFactorizedLowerLimitNorm = new List<HydraulicBoundaryLocationCalculation>();
+        private readonly IList<HydraulicBoundaryLocationCalculation> waveHeightCalculationsForFactorizedSignalingNorm = new List<HydraulicBoundaryLocationCalculation>();
+        private readonly IList<HydraulicBoundaryLocationCalculation> waveHeightCalculationsForSignalingNorm = new List<HydraulicBoundaryLocationCalculation>();
+        private readonly IList<HydraulicBoundaryLocationCalculation> waveHeightCalculationsForLowerLimitNorm = new List<HydraulicBoundaryLocationCalculation>();
+        private readonly IList<HydraulicBoundaryLocationCalculation> waveHeightCalculationsForFactorizedLowerLimitNorm = new List<HydraulicBoundaryLocationCalculation>();
         private ReferenceLine referenceLine;
 
         /// <summary>
@@ -211,63 +210,63 @@
         /// </summary>
         public TechnicalInnovationFailureMechanism TechnicalInnovation { get; }
 
-        public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForFactorizedSignalingNorm
+        public IEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForFactorizedSignalingNorm
         {
             get
             {
                 return waterLevelCalculationsForFactorizedSignalingNorm;
             }
         }
 
-        public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForSignalingNorm
+        public IEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForSignalingNorm
         {
             get
             {
                 return waterLevelCalculationsForSignalingNorm;
             }
         }
 
-        public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForLowerLimitNorm
+        public IEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForLowerLimitNorm
         {
             get
             {
                 return waterLevelCalculationsForLowerLimitNorm;
             }
         }
 
-        public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForFactorizedLowerLimitNorm
+        public IEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForFactorizedLowerLimitNorm
         {
             get
             {
                 return waterLevelCalculationsForFactorizedLowerLimitNorm;
             }
         }
 
-        public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaveHeightCalculationsForFactorizedSignalingNorm
+        public IEnumerable<HydraulicBoundaryLocationCalculation> WaveHeightCalculationsForFactorizedSignalingNorm
         {
             get
             {
                 return waveHeightCalculationsForFactorizedSignalingNorm;
             }
         }
 
-        public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaveHeightCalculationsForSignalingNorm
+        public IEnumerable<HydraulicBoundaryLocationCalculation> WaveHeightCalculationsForSignalingNorm
         {
             get
             {
                 return waveHeightCalculationsForSignalingNorm;
             }
         }
 
-        public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaveHeightCalculationsForLowerLimitNorm
+        public IEnumerable<HydraulicBoundaryLocationCalculation> WaveHeightCalculationsForLowerLimitNorm
         {
             get
             {
                 return waveHeightCalculationsForLowerLimitNorm;
             }
         }
 
-        public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaveHeightCalculationsForFactorizedLowerLimitNorm
+        public IEnumerable<HydraulicBoundaryLocationCalculation> WaveHeightCalculationsForFactorizedLowerLimitNorm
         {
             get
             {