We are often required to split the earthwork summaries out left and right of the existing roadway. In some cases we even have to have left, right, and median summaries. Until recently the only known way to accomplish separate summaries in Geopak was by modifying level symbology and making separate runs for the different sections.

The simplest case is summarizing earthwork left and right for a widening-type of Typical Section. The Excavation Limit lines left of the proposed elements would be on level 30. The Excavation Limit lines in the middle would be somewhere within the limits of the existing pavement and on level 31. The Excavation Limit lines right of the proposed elements would be on level 32. These Excavation Limit lines can be placed into the cross section file using vertical line criteria or by hand.

With a leveling scheme for Excavation Limits as described above, left-side-only earthwork can be generated by adding the following statement block to the earthwork input file

excavaion limits

lv = 30,31

A second run should be made in which

excavaion limits

lv = 31,32

In this way the first run will compute earthwork between the level 30 and 31 lines (to yield left earthwork), and the second run will compute earthwork between the level 31 and 32 lines (to yield right earthwork). In both cases there must be the following statement immediately before the process earthwork for baseline = statement:

Notice that the only difference between the two "excavation limits" statement blocks is the value for level. There should be four files in all: ew_L_lt.inp, ew_L_lt.log, ew_L_rt.inp, and ew_L_rt.log.

Example:

XSECTION
  Earthwork

  Tolerance = 0.06
  
  XS DGN = R:\R2533\XSC\L.XSC

  proposed finish grade
    soil type = a2
    fill multiplication factor = 1.15
    type = line,line_string
    lv = 10

  existing ground line
    soil type = a2
    type = line,line_string
    lv = 60
    co = 0
    wt = 3
    lc = 3

  excavation limits
    lv = 31,32

  write earthwork shapes
    plot parameters
      lv = 19
      co = 16
      wt = 4
      lc = 0

  calculate only between limits

  process earthwork for baseline = l
    job number = c01
    beginning station = 132+75.20
    ending station = 134+11.226

Care should be taken to avoid unintended volume gaps between stations. For example, Stations 10+00 through 15+00 are widening and resurfacing. Stations 15+20 through 20+00 are full depth. The earthwork run for the full depth section must include station 15+00 or 20 meters of earthwork are not accounted for. Furthermore, the run which covers 15+00 through 20+00 must not have the "calculate only between excavation limits" statement at all so that the entire area of station 15+00 will be used (even though the Excavation Limit lines may be there.

If a service road, ramp, or collector/distributor falls on the same cross-section pattern as the main line, and if the earthwork for that roadway must be separated, the Excavation Limit lines may need to be placed by hand.