Index: src/Deltares.DSoilModel.Data/DSoilModelProject.cs
===================================================================
diff -u -r793 -r796
--- src/Deltares.DSoilModel.Data/DSoilModelProject.cs	(.../DSoilModelProject.cs)	(revision 793)
+++ src/Deltares.DSoilModel.Data/DSoilModelProject.cs	(.../DSoilModelProject.cs)	(revision 796)
@@ -783,6 +783,26 @@
             return results.ToArray();
         }
 
+        [Validate]
+        public ValidationResult[] ValidatePreConsolidations()
+        {
+            var results = new List<ValidationResult>();
+
+            foreach (var soilProfile2D in soilProfiles2D)
+            {
+                SoilProfile2D thisSoilProfile2D = soilProfile2D;
+                foreach (var preconsolidationStress in thisSoilProfile2D.PreconsolidationStresses)
+                {
+                    if (double.IsNaN(preconsolidationStress.StressValue))
+                    {
+                        string messageForProfile = String.Format(this.Translate("PreconsolidationStressIsNan"), preconsolidationStress.X, preconsolidationStress.Y);
+                        results.Add(new ValidationResult(ValidationResultType.Warning, messageForProfile, thisSoilProfile2D));
+                    }
+                }                
+            }
+            return results.ToArray();
+        }
+
         /// <summary>
         /// Add soil data to the project, resolving duplicate names
         /// </summary>
@@ -1301,7 +1321,7 @@
             }
             for (int i = selectedSegment.Cpts.Count - 1; i >= 0; i--)
             {
-                if (Math.Abs(selectedSegment.Cpts[i].Xlocal - (noPoint)) < double.Epsilon)
+                if (Math.Abs(selectedSegment.Cpts[i].Xlocal - (noPoint)) < GeometryConstants.Accuracy)
                 {
                     selectedSegment.Cpts.Remove(selectedSegment.Cpts[i]);
                 }
@@ -1325,7 +1345,7 @@
             }
             for (int i = selectedSegment.Borings.Count - 1; i >= 0; i--)
             {
-                if (Math.Abs(selectedSegment.Borings[i].Xlocal - (noPoint)) < double.Epsilon)
+                if (Math.Abs(selectedSegment.Borings[i].Xlocal - (noPoint)) < GeometryConstants.Accuracy)
                 {
                     selectedSegment.Borings.Remove(selectedSegment.Borings[i]);
                 }
Index: src/Deltares.DSoilModel.Data/Translations.xml
===================================================================
diff -u -r793 -r796
--- src/Deltares.DSoilModel.Data/Translations.xml	(.../Translations.xml)	(revision 793)
+++ src/Deltares.DSoilModel.Data/Translations.xml	(.../Translations.xml)	(revision 796)
@@ -76,4 +76,5 @@
   <Translation ID="ErrorNoValidGeometryFile" en-US="'{0}' is not a geometry file (*.geo) or a D-Geo Stability file (*.sti)" nl-NL="'{0}' is geen geometrie bestand (*.geo) of een D-Geo Stability bestand (*.sti)" />
   <Translation ID="ErrorNoValidGeometryData" en-US="Geometry data in '{0}' is of a version of D-Geo Stability that is not supported and cannot be read" nl-NL="Geometrie data in '{0}' is van een versie van D-Geo Stability die niet ondersteund wordt en kan niet gelezen worden" />
   <Translation ID="ErrorNoValidSoilData" en-US="Soil data in '{0}' is of a version of D-Geo Stability that is not supported and cannot be read" nl-NL="Materialen data in '{0}'  is van een versie van D-Geo Stability die niet ondersteund wordt en kan niet gelezen worden" />
+  <Translation ID="PreconsolidationStressIsNan" en-US="The preconsolidation stress at X={0} and Y={1}is NaN." nl-NL="De grensspanning bij X={0} en Y={1} is niet opgegeven." />  
 </Translations>