Shears

FOOTNOTES :

1 O.S.H.A. Safety and Health Association 2

2 N.I.0.S.H. - National Institute of Safety & Health (U.S.) 3

3 A.I.H.A. - American Industrial Hygiene Association (U.S.) a

4 Fibres per cubic centimeter (f/cc) is the same and often a)
interchanged with fibres/ml.

5 Not required at Cassiar as we purchase filters already 3
mounted inside an acrylic plastic filter holder.

6 At Cassiar we have always used a constant flowrate of ae ep
2 1/min.

7 We use a 25 mm. cover slip : 5

8 We are using a magnification on our miscroscope, 7
consequently slightly higher readings will result

9 We use 13 min. diameter 0.2 um pore size metrical 7
alpha 8 filters.

10 At Cassiar a sector approximately 1/3 the size of the 7
filter is cut and mounted,

11 We use a syringe filter holder for dispensing and 7
distributing the mounting solution. This is a more
acceptable method.

12 Cassiar, B.C. 3625 Graticule (see attached page) 8

13 At Cassiar we use premounted filters in acrylic filter 11
holders; therefore blanks are counted very seldom.

14 It is not necessary to correct for temperature and 11

pressure but where deviations between sampling location
and laboratory conditions exist it should be considered,

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