diff --git a/src/regolith/module_regolith.f90 b/src/regolith/module_regolith.f90
index befe69a6..90e1e030 100644
--- a/src/regolith/module_regolith.f90
+++ b/src/regolith/module_regolith.f90
@@ -235,8 +235,9 @@ end subroutine regolith_subcrater_mix
    end interface
 
    interface
-      subroutine regolith_mix(surfi,mixing_depth,domain)
+      subroutine regolith_mix(user,surfi,mixing_depth,domain)
       use module_globals
+      type(usertype),intent(in) :: user
       type(surftype),intent(inout) :: surfi
       real(DP),intent(in) :: mixing_depth
       type(domaintype),intent(in) :: domain
diff --git a/src/regolith/regolith_interior.f90 b/src/regolith/regolith_interior.f90
index 3f33e8ee..d1bf119a 100644
--- a/src/regolith/regolith_interior.f90
+++ b/src/regolith/regolith_interior.f90
@@ -62,7 +62,7 @@ subroutine regolith_interior(user,surf,crater,domain,incval,nmeltsheet,vmeltshee
             lradsq = x_relative**2 + y_relative**2
 
             if (lradsq > crater%frad**2) cycle
-            call util_traverse_pop_array(surf(xpi,ypi)%regolayer,surf(xpi,ypi)%abselc,poppedarray)
+            call util_traverse_pop_array(user,surf(xpi,ypi)%regolayer,surf(xpi,ypi)%abselc,poppedarray)
             deallocate(poppedarray)
 
             !fill top layer with melt sheet of given thickness hmeltsheet
diff --git a/src/regolith/regolith_mix.f90 b/src/regolith/regolith_mix.f90
index a7b36668..ab5c72be 100644
--- a/src/regolith/regolith_mix.f90
+++ b/src/regolith/regolith_mix.f90
@@ -16,13 +16,14 @@
 !  Notes       :  
 !
 !**********************************************************************************************************************************
-subroutine regolith_mix(surfi,mixing_depth,domain)
+subroutine regolith_mix(user,surfi,mixing_depth,domain)
    use module_globals
    use module_util
    use module_regolith, EXCEPT_THIS_ONE => regolith_mix
    implicit none
 
    ! Arguments
+   type(usertype),intent(in) :: user
    type(surftype),intent(inout) :: surfi
    real(DP), intent(in) :: mixing_depth
    type(domaintype),intent(in) :: domain
@@ -40,7 +41,7 @@ subroutine regolith_mix(surfi,mixing_depth,domain)
    ! if(domain%currentqmc .eqv. .true.) then
    !    j = 0
    ! end if     
-   call util_traverse_pop_array(surfi%regolayer,mixing_depth,poppedarray)
+   call util_traverse_pop_array(user,surfi%regolayer,mixing_depth,poppedarray)
 
    newlayer%thickness = 0.0_DP
    newlayer%comp      = 0.0_DP
diff --git a/src/regolith/regolith_subcrater_mix.f90 b/src/regolith/regolith_subcrater_mix.f90
index ae40822f..967c5a25 100644
--- a/src/regolith/regolith_subcrater_mix.f90
+++ b/src/regolith/regolith_subcrater_mix.f90
@@ -66,7 +66,7 @@ subroutine regolith_subcrater_mix(user,surf,domain,nflux,finterval,p)
          N = size(surf(i,j)%regolayer)
 
          if (surf(i,j)%regolayer(N)%thickness < dd) then             
-            call regolith_mix(surf(i,j),dd,domain)
+            call regolith_mix(user,surf(i,j),dd,domain)
          end if
          
        end do
diff --git a/src/util/module_util.f90 b/src/util/module_util.f90
index 1c90f2be..26ecb045 100644
--- a/src/util/module_util.f90
+++ b/src/util/module_util.f90
@@ -83,9 +83,10 @@ end subroutine util_pop
 ! end interface
 
 interface
-   subroutine util_traverse_pop_array(regolayer,traverse_depth,poppedarray)
+   subroutine util_traverse_pop_array(user,regolayer,traverse_depth,poppedarray)
    use module_globals
    implicit none
+   type(usertype),intent(in) :: user
    type(regodatatype),dimension(:),allocatable,intent(inout) :: regolayer
    real(DP),intent(in) :: traverse_depth
    type(regodatatype),dimension(:),allocatable,intent(out) :: poppedarray
diff --git a/src/util/util_traverse_pop_array.f90 b/src/util/util_traverse_pop_array.f90
index cf5daf97..3ba03cbc 100644
--- a/src/util/util_traverse_pop_array.f90
+++ b/src/util/util_traverse_pop_array.f90
@@ -18,13 +18,14 @@
 !  Notes       :  Popped list will be in reversed order from the original list
 !
 !**********************************************************************************************************************************
-subroutine util_traverse_pop_array(regolayer,traverse_depth,poppedarray)
+subroutine util_traverse_pop_array(user,regolayer,traverse_depth,poppedarray)
     use module_globals
     use module_util, EXCEPT_THIS_ONE => util_traverse_pop_array
     implicit none
  
     ! Arguments
     !type(regolisttype),pointer   :: regolayer
+    type(usertype),intent(in)     :: user
     type(regodatatype),dimension(:),allocatable,intent(inout) :: regolayer
     real(DP),intent(in)          :: traverse_depth
     !type(regolisttype),pointer   :: poppedlist 
@@ -69,6 +70,14 @@ subroutine util_traverse_pop_array(regolayer,traverse_depth,poppedarray)
 
     poppedarray(1)%thickness = poppedarray(1)%thickness - depth_diff
     regolayer(maxi)%thickness = regolayer(maxi)%thickness - poppedarray(1)%thickness
+    poppedarray(1)%totvolume = poppedarray(1)%thickness * user%pix * user%pix
+    poppedarray(1)%meltvolume = poppedarray(1)%meltfrac * poppedarray(1)%totvolume
+    poppedarray(1)%distvol(:) = poppedarray(1)%meltdist(:) * poppedarray(1)%totvolume
+    poppedarray(1)%ejm = poppedarray(1)%ejmf * poppedarray(1)%totvolume
+    regolayer(maxi)%totvolume = regolayer(maxi)%thickness * user%pix * user%pix
+    regolayer(maxi)%distvol(:) = regolayer(maxi)%meltdist(:) * regolayer(maxi)%totvolume
+    regolayer(maxi)%meltvolume = regolayer(maxi)%meltfrac * regolayer(maxi)%totvolume
+    regolayer(maxi)%ejm = regolayer(maxi)%ejmf * regolayer(maxi)%totvolume
 
     ! copy regolayer from 1 to maxi to temp variable, then deallocate regolayer, then movealloc templayer onto regolayer <--may need temp array
     allocate(oldregodata,source=regolayer(1:maxi))