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CITY OF PRINCE GEORGE WELLS PROTECTION PLAN

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March 2015<br />

City of Prince George Well Protection Plan<br />

Table 9: Contaminant risk summary<br />

Source<br />

Potential<br />

Source<br />

Potential Contaminants of<br />

Concern<br />

Likelihood of Occurrence<br />

(fromTable 6) and rationale<br />

D (Unlikely).<br />

Magnitude of<br />

Consequence<br />

(from Table 7)<br />

Risk to<br />

Drinking Water<br />

(from Table 8)<br />

1<br />

Derailments<br />

in CN yard<br />

Hydrofluorisilicic Acid, Sodium<br />

Hypochlorite, Liquefied<br />

Petroleum Gasoline, Diesel Fuel<br />

and / or Fuel Oil, Sodium<br />

Hydroxide Solution, Methanol,<br />

Ethanol, Perchloryl Fluoride,<br />

Aluminum Smelting By-<br />

Products, Sulphuric Acid and<br />

Sodium Chlorate*<br />

In 2012 and 2013, there were 11 and<br />

eight derailments in the CN yard,<br />

respectively. The following is a list of<br />

the contaminants that were spilled 2012<br />

and 2013: Petroleum Gas, Diesel Fuel,<br />

Sodium Hydroxide Solution, Methanol,<br />

Fuel Oil, Ethanol, Environmentally<br />

Hazardous Substances, Aluminum<br />

Smelting By-products, Sulphuric Acid<br />

and Sodium Chlorate.<br />

The geology in the area is permeable<br />

(sand and gravel), no low permeability<br />

layer (silt or clay) is present above the<br />

water-bearing sands and gravels. The<br />

aquifer in the vicinity of the CN Yard is<br />

thus vulnerable to contamination. The<br />

CN yard is between 1.8 and 3.8 km<br />

away and downstream from the existing<br />

wells. There are no immediate plans for<br />

new wells; however, in future (>10<br />

years), the City may decide to install a<br />

well closer to the CN yard.<br />

2 (Minor).<br />

Future wells<br />

would need to<br />

avoid CN yard.<br />

Low<br />

2<br />

Derailments<br />

on railway<br />

track and<br />

train<br />

collisions<br />

Hydrofluorisilicic Acid, Sodium<br />

Hypochlorite, Liquefied<br />

Petroleum Gasoline, Diesel Fuel<br />

and / or Fuel Oil, Sodium<br />

Hydroxide Solution, Methanol,<br />

Ethanol, Perchloryl Fluoride,<br />

Aluminum Smelting By-<br />

Products, Sulphuric Acid and<br />

Sodium Chlorate*<br />

C (Possible).<br />

The last known derailment in Prince<br />

George was in 2007, eight years ago.<br />

The nearest railway to an existing<br />

production well is 24m (to Well 602).<br />

The geology in the area is permeable<br />

(sand and gravel), no low permeability<br />

layer (silt or clay) is present above the<br />

water-bearing sands and gravels.<br />

4 (Major). The<br />

City has four<br />

wells; therefore,<br />

loss of all wells<br />

with one<br />

derailment is<br />

unlikely.<br />

Very High<br />

(within 60<br />

days**)<br />

3<br />

4<br />

5<br />

Grade<br />

crossing<br />

accidents<br />

Well houses<br />

(train<br />

collision)<br />

Track<br />

maintenance<br />

chemicals<br />

Hydrofluorisilicic Acid, Sodium<br />

Hypochlorite, Liquefied<br />

Petroleum Gasoline, Diesel Fuel<br />

and / or Fuel Oil, Sodium<br />

Hydroxide Solution, Methanol,<br />

Ethanol, Perchloryl Fluoride,<br />

Aluminum Smelting By-<br />

Products, Sulphuric Acid and<br />

Sodium Chlorate*<br />

Hydrofluorisilicic Acid, Sodium<br />

Hypochlorite, Liquefied<br />

Petroleum Gasoline, Diesel Fuel<br />

and / or Fuel Oil, Sodium<br />

Hydroxide Solution, Methanol,<br />

Ethanol, Perchloryl Fluoride,<br />

Aluminum Smelting By-<br />

Products, Sulphuric Acid and<br />

Sodium Chlorate* and<br />

Hydrofluorisilicic Acid, and<br />

Sodium Hypochlorite<br />

Unknown Herbicides and<br />

Pesticides<br />

C (Possible).<br />

In Prince George in 2012 and 2013,<br />

there were two and three collisions,<br />

respectively. The nearest grade<br />

crossing is 138 m to Well 605. The<br />

geology in the area is permeable (sand<br />

and gravel), no low permeability layer<br />

(silt or clay) is present above the waterbearing<br />

sands and gravels.<br />

E (rare).<br />

In Prince George in 2012 and 2013,<br />

there eight and five dangerous goods<br />

incidences, respectively. The nearest<br />

railway to a well house is 24 m (PW<br />

602), and the well houses have not<br />

been hit by a railroad (the most recent<br />

well was installed in 2005, or 10 years<br />

ago. Therefore, the likelihood of a<br />

railroad moving 24 m off a rail is rare.<br />

4 (Major). The<br />

City has four<br />

wells; therefore,<br />

loss of all wells<br />

with one<br />

derailment is<br />

unlikely.<br />

4 (Major). The<br />

City has four<br />

wells; therefore,<br />

loss of all wells<br />

with one<br />

derailment is<br />

unlikely.<br />

Very High<br />

(within 60<br />

days**)<br />

High (within 1<br />

day**)<br />

D (Unlikely) 2 (Minor) Low<br />

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