--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/collision/CollisionAccess.java	Tue May 15 12:00:26 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/collision/CollisionAccess.java	Tue May 15 18:04:36 2018 +0200
@@ -10,9 +10,8 @@
 
 package org.dive4elements.river.artifacts.sinfo.collision;
 
-import org.apache.commons.lang.math.DoubleRange;
 import org.dive4elements.river.artifacts.access.RangeAccess;
-import org.dive4elements.river.artifacts.common.AccessHelper;
+import org.dive4elements.river.artifacts.common.EpochYearAccessHelper;
 import org.dive4elements.river.artifacts.sinfo.SINFOArtifact;
 import org.dive4elements.river.artifacts.sinfo.SinfoCalcMode;
 
@@ -26,7 +25,7 @@
  */
 final class CollisionAccess extends RangeAccess {
 
-    private final AccessHelper helper;
+    private final EpochYearAccessHelper helper;
 
     /// Fields from state:
 
@@ -41,16 +40,10 @@
 
         /* assert calculation mode */
         final SinfoCalcMode calculationMode = artifact.getCalculationMode();
-        this.helper = new AccessHelper(artifact);
+        this.helper = new EpochYearAccessHelper(artifact);
         assert (calculationMode == SinfoCalcMode.sinfo_calc_flow_depth);
     }
 
-    public DoubleRange getRange() {
-        final double from = getFrom();
-        final double to = getTo();
-        return new DoubleRange(from, to);
-    }
-
     public int[] getYears() {
         return this.helper.getYears("state.sinfo.year", "years");
     }