CITY OF PRINCE GEORGE WELLS PROTECTION PLAN

March 2003 022- f 7 84
The simulation indicates that in the event of a release, t e contaminant plume would
extend northeast from the de gure 33). After the event, the
contaminant concentration at
to increase to 0.1% of source
concentration after approximately two w e relative concentration is then
predicted to gradually increase to a steady-state value of about 1.3% after about three
months. This would predict a steady-state
ation significantly above
drinking water guidelines, with drinking wate
y being exceeded as soon
as the plume reaches the well.
We understand that at one
snow dump near Foothills
We understand that the fa
portion of the resulting s
snowmelt from exist
chromium, copper,
Water Quality Gul
potential to adverse1
The site of the propose
PW607 but within the
pumping rates were used in this simulation.
prnent of a proposed
, with a significant
., 1998; Dayton &
ts associated with
metals (aluminum,
ritish Columbia
t would have the
outside of the current capture zone for
ere fore, projected average
Based on the simulation (Figure 33), the resulting contaminant plume is predicted to
extend northeast from the propose
Following the start of snowmelt, the
contaminant concentration at
icted to increase to 0.19% of the source
concentration after approximately two
relative concentration is then predicted
to gradually increase to a steady-state
ut 5.5 % of source concentration within
ten years.
Though several contaminants of concern are ~e~ent in the snowmelt, benzo(a)pyrene
was selected as a key indicator arameter because it has been found above water quality
guidelines in snowmelt (refer escribed above). &~ed on a solubility of
0.003 mgL, benzo(a)pyrene concentrations would exceed Canadian Drinhng Water
Guidelines (0.01 u@) after approximately 8 mmhs. Depending on the presence of