CITY OF PRINCE GEORGE WELLS PROTECTION PLAN

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March 2015 City of Prince George Well Protection Plan Figure 26: The At Grade Crossing at Mile 2.76 Page | 36
March 2015 City of Prince George Well Protection Plan Mile 5.35 The second crossing at Mile 5.35 has a posted speed limit of 30km/h (reduced from the speed limit of 50km/h on either side of this location). This crossing sees relatively high train speeds, as well as significant residential and recreational traffic and this is likely to increase in the future. Although this crossing is not particularly close to the river, it is worth noting that a side track which ends in a storage facility is located nearby. There is a further discussion of the risks associated with this facility in the following section. Figure 27: The Graded Crossing at Mile 5.35 Mile 6.31 The crossing at Mile 6.31 potentially poses the highest risk of the three, as it is extremely close to the Nechako river (see Figure 28 and Figure 29), has the highest train speeds, and the posted road speed limit on the north side of the crossing changes to 70km/h. If a hazardous material were to enter the river at this point, it could begin to move into the aquifer very rapidly depending on the nature of the spill substance. Whether or not the substance in question would enter the aquifer from the river would depend on a variety of factors including the nature of the substance itself (as mentioned above) and/or if the city operators were able to turn off the well pumps. For example, if an LNAPL was spilled at this location, it may float by and continue down the river, while a DNAPL spilled at this same location may move along the bottom and into the aquifer. Derailments and spills at Miles 5.35 and particularly Mile 6.31 are considered the highest risk incident locations based on their potential to impact all three (3) main wells. This impact could occur from a direct spill to the Nechako River at these locations. A large spill at either of these locations into the river proper could result in contaminants moving into the aquifer towards PW660, 605, and 601 in a relatively short time. As illustrated in Figure 16 and Figure 17, the river water feeds the aquifer for each of these well locations. In the event of a river water contamination event, the contaminants could access each aquifer capture zone in a manner consistent with the contaminant’s physical properties. In this scenario, collective travel times to the well could be the shortest in comparison to all other contamination scenarios. Page | 37
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Page 3 and 4: March 2015 City of Prince George We
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Page 55 and 56: Appendix A Definitions
Page 57 and 58: (v) causes or sustains a fire or ex
Page 59 and 60: Arabshahi, H., Polysou, N. Geotechn
Page 61 and 62: Appendix C Excerpt from Golder Asso
Page 63 and 64: March 2003 022- 17 84 Scenario #6 -
Page 65 and 66: March 2003 022- 1784 For this scena
Page 67: Appendix D Well Logs

CITY OF PRINCE GEORGE WELLS PROTECTION PLAN

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