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The smaller mills are generally located in the woods near their
log supply and the slabs and sawdust produced are either left in piles
or burned.

III. METHOD OF MAKING SURVEY

Owing to the large number of mills in the region, it was not
possible to study each mill in detail. Certain representative mills were
therefore selected whose layout made possible a fairly accurate measure-
ment of the waste.

1. Measurement of Logs

The length and diameter at both ends of each log were measured
on the log deck during the study. The board foot and cubic foot contents
of the logs were based on the British Columbia Log Scale and the British
Columbia Cubic Scale respectively.

2@e Measurement of Solid Residue

Members of the study crew were stationed at convenient points
in the mill for measuring the solid residue.

This solid residue was segregated into two main classifications,
as follows:

Slabwood - included all wood which was cut from the outside of
the log. It was either half-round slabs or quarter-
round edgings.

Rectangular pieces - included all wood (mainly trimmings) which
had three square dimensions.

All measurements were made inside the bark and for the purpose of this
report bark was disregarded.

3. Measurement of Sawdust

The board foot and cubic foot contents of the logs were measured
as in the study on solid residue. Members of the study crew were stationed
at each of the main sawing michines. These included headsaw, edger, gang
saw, and trim saws.

The length and depth of each cut made by the saws in the various
machines were tallied. Knowing the kerf of the various saws it was
possible to calculate the amount of solid wood converted into sawdust.