Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineShoulderAdapter.cs
===================================================================
diff -u -r4540 -r5936
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineShoulderAdapter.cs	(.../SurfaceLineShoulderAdapter.cs)	(revision 4540)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineShoulderAdapter.cs	(.../SurfaceLineShoulderAdapter.cs)	(revision 5936)
@@ -34,8 +34,6 @@
 /// </summary>
 public class SurfaceLineShoulderAdapter : SurfaceLineAdapter
 {
-    private readonly LineHelper lineHelper = new LineHelper();
-
     /// <summary>
     /// Initializes a new instance of the <see cref="SurfaceLineShoulderAdapter"/> class.
     /// </summary>
@@ -125,7 +123,7 @@
         GeometryPoint dikeBaseInside = hasShoulderInside ? surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.ShoulderBaseInside) : dikeToeAtPolder;
         // Determine intersectionpoint with slope for a horizontal shoulder
         GeometryPoint intersectionPointAtDike;
-        intersectionPointAtDike = lineHelper.GetIntersectionPointWithExtrapolation(dikeTopAtPolder, dikeBaseInside,
+        intersectionPointAtDike = LineHelper.GetIntersectionPointWithExtrapolation(dikeTopAtPolder, dikeBaseInside,
                                                                                    new GeometryPoint(dikeToeAtPolder.X, shoulderHeight + dikeToeZ),
                                                                                    new GeometryPoint(dikeToeAtPolder.X + 1, shoulderHeight + dikeToeZ));
         var newTopShoulder = new GeometryPoint(intersectionPointAtDike.X + shoulderLength, shoulderHeight + dikeToeZ);
@@ -135,7 +133,7 @@
             // from the horizontal intersection point. This will result in the actual width of the shoulder being a bit 
             // larger than the requested size but that can not be helped (classic chicken-egg problem)
             var pb = new GeometryPoint(newTopShoulder.X - 100, newTopShoulder.Z + (100 * Location.NewShoulderTopSlope));
-            intersectionPointAtDike = lineHelper.GetIntersectionPointWithExtrapolation(dikeTopAtPolder, dikeBaseInside, pb, newTopShoulder);
+            intersectionPointAtDike = LineHelper.GetIntersectionPointWithExtrapolation(dikeTopAtPolder, dikeBaseInside, pb, newTopShoulder);
             if (intersectionPointAtDike.Z > MaxShoulderLevel)
             {
                 throw new SurfaceLineAdapterException(Resources.SurfaceLineShoulderAdapterNewShoulderHeightTooLargeTopSlopeError);