Britannia Contaminated Sites Investigation Stage I Preliminary Site ...

7.1 FAN AREA
The Fan Area has been subdivided into four Areas of Environmental Concern (AECs), as
described below:
• AEC 1, the Milling/Processing Area at the eastern-southern portion of the Fan Area where
there has been the highest concentration of milling and processing activities directly related
to the production of concentrates and disposal of wastes;
• AEC 2, the Residential/Commercial Area/Storage north of AEC 1 activities were primarily
residential, commercial, and storage, including historical port facilities along the shoreline
and historical disposal of mine waste and tailings;
• AEC 3, the Intertidal Zone of the Fan Area where there has been widespread deposition of
tailings and that continues to receive potentially contaminated stormwater and groundwater;
and
• AEC 4, Lower Britannia Creek (adjacent to the Fan Area) which has received discharges
from milling/processing activities in the Fan Area and possibly from upstream mine sources.
Within the AECs, stormwater and 54 specific buildings or structures have been identified with
COCs and PCOCs. Most of these are within AEC 1.
Within the Fan Area AECs, the contaminants have been grouped into two categories: metals and
petroleum hydrocarbons. Based on recent data sources indicating elevated concentrations of
metals in soils, metals have been classed as COCs (Golder 2001). Petroleum hydrocarbons have
not previously been detected on-site; however, their presence is suspected and they are classed as
PCOCs.
Location Number
AEC 1
LOCATIONS OF
ENVIRONMENTAL
CONCERNS
(multiple names/uses,
which occurred at some
sites, are indicated)
Table 14
Fan Area AECs & PCOCs (Figures 8 and 9)
CONTAMINANTS OF
CONCERN (COCs) AND
POTENTIAL
CONTAMINANTS OF
CONCERN (PCOCs)
Britannia Contaminated Site Investigation
Stage I Preliminary Site Investigation
Project No. 50319-001-310 33
RATIONALE FOR CONCERN
1 No. 1 Mill Metals Contaminants commonly associated with mineral processing
2 No. 2 Mill Metals Contaminants commonly associated with mineral processing
3 No. 3 Mill Metals Contaminants commonly associated with mineral processing
4 Powerhouse
Metals, petroleum
hydrocarbons, PCBs
Contaminants commonly associated with powerhouse operations.