APPENDIX G - P.C.B. OBJECTIVES

We have summarized hereunder the main objectives currently applicable to
the Cassiar operations:
DESIRABLE LEVELS OF AMBIENT AIR QUALITY
CONTAMINANT
Suspended Particulate
Matter
- Total A.G.M,
- Max 24 hr.
Dustfall (Total) )
- Residential tons/mi-/mo.
- Other tons/mi-/ino.

Total Particulate § =6GR/SCF
Sulphur Dioxide | ppm

CHARACTERISTICS LEVEL A LEVEL B EVEL Cf
Total Suspended Solids : |. = 50 150 = |
Total Dissolved Solids : | = 2500 3500 50005
pH t 6.5-8.5 6.5-9.5 6.0-10.0]
Dissolved Iron , O23 | 5
Nitrates/Nitrates as N : 10 ae) 50
Oil and Grease 15 15 15
Limit Toxicity | 100 80 20

Objectives are 3-tiered:

*A - High quality - all new installations are expected to meet or exceed
this level.

*B - Intermediate quality - interim upgrading Level from C.

*C - Low quality - to be upgraded by planned stages to Level A.