FOREST SERVICE HANDBOOK
MISSOULA, MONTANA
FSH 2409.11 - NATIONAL FOREST LOG SCALING HANDBOOK
Region 1 Supplement No. 22
Effective August 29, 1991
POSTING NOTICE. Supplements to this title are numbered consecutively. Check the last
transmittal received for this title to see that the above supplement number is in sequence. If not,
order intervening supplements at once on form 1100-6. Do not post this supplement until the
missing one(s) is received and posted. After posting retain this transmittal until the next
supplement to this title is received. Place it at the front of the title.
Page Code
64--1 thru --2
64--1 thru --2
SupersededNew
(No. of Sheets)
1
-
Digest:
63 - Wording change.
JOHN W. MUMMA
Regional Forester
R-1 SUPP 22 EFFECTIVE 08/29/91
1
64--1
NATIONAL FOREST LOG SCALING HANDBOOK
60 CHECK SCALING
62 Frequency
As a minimum, regular Qualified or Advanced scalers shall be checked at least once each quarter
while actively scaling. Less experienced scalers should be checked more often with
consideration given to their experience, capabilities, species, amount of defect, workload, etc.
63 Procedure
A check sale shall contain a representative sample of a scaler's overall job of measurement. As a
minimum, a check scale will consist of at least 100 logs and 30,000 board feet gross scale, or 200
logs representing a gross scale volume of at least 10,000 board feet.
Calipers shall be used to take diameter measurements at all measurement points which cannot be
accurately made with the scale stick, such as logs with crotched tops, or logs with broken and/or
irregular ends. Scalping will not be required, except where bark thickness cannot be accurately
estimated.
64 Standards
The following check scaling standards shall be used to determine if satisfactory measurement
standards are being maintained:
Check Scale Percent of
Defect on Logs Checked
Up to 10 . . . . . . . . . Within 2 percent of check scale
10.1 to 15 . . . . . . . . Within 3 percent of check scale
15.1 to 20 . . . . . . . . Within .2 percent for each percent of defect
Over 20 . . . . . . . . . Within 5 percent of check scale
Examples:
- Logs 8 percent defective must be within 2 percent of check scale
- Logs 14 percent defective must be within 3 percent of check scale
- Logs 16 percent defective multiply 16 x .2 - 3.2 percent of check scale
- Logs 22 percent defective msut be within 5 percent of check scale
R-1 SUPP 22 EFFECTIVE 08/29/91
The allowable limit of gross scale volume variance shall be + 2 percent unless otherwise
justified.
R-1 SUPP 22 EFFECTIVE 08/29/91