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Radloff March 21 st , 2016 ~:\ mber of th Assocl tNI Engin ring - PowerPoint PPT Presentation

Mar 20, 2024 •304 likes •482 views

~ E ~ N ~ S ~ O ~ ~ R ~ City of Prince George Wells Protection Plan: For CN Related Risks Presented by: CITY OF ENGINEERING PLANNING CONSULTING www.radloffeng.com PRINCE GEORGE Radloff March 21 st , 2016 ~:\ mber of th Assocl tNI Engin

  1. ~ E ~ N ~ S ~ O ~ ~ R ~ City of Prince George Wells Protection Plan: For CN Related Risks Presented by: CITY OF ENGINEERING PLANNING CONSULTING www.radloffeng.com PRINCE GEORGE Radloff March 21 st , 2016 ~:\ mber of th Assocl tNI Engin ring Group of Compan, s

  2. Purpose Assessment of risk to the City’s wells from CN related activities and the means to mitigate this risk.

  3. The Nechako Aquifer The aquifer: • Provides 95% of City’s well water (PW660, PW605, PW602/601) • Is a highly valuable natural feature producing excellent well water • Is classified by MOE as “1A” ( heavily developed and highly productive and highly vulnerable )

  4. Nechako Aquifer Area in Pink

  5. Scope Focus of study between Mile 0 (CN Rail Yard) to Mile 6.31 (Miworth Subdivision)

  6. Wells Three (3) active wells along the Nechako River: PW601/602, PW605, PW660 • Located between the CN rail lines & the river • Installed value of aprox. $6 million per well • Radial Collector Wells • Located primarily in glacio-fluvial sand & gravel with no confining unit to protect from surface spills • Vertical migration could be very swift (18 min. worst case)

  7. ~ ~ VERTICAL TURBINE PUMPS & MOTORS Radial Collector Well i ! / I ~: REINFORCED f C) I CONCRETE (;:! : CAISSON / I I ,il:, I >:: I ~ = I ~ = I / ~ ::s • = - - --WATER LEVEL ,,,/ ~: / I '- I ,.,./' () I ~ = I / ~,,.,,,_,,.,/ _, _ e: I __ ..,.,..,. ... ~ = C) I I PUMP COLUMN I I I I ,,.. I ___, a I I I I PUMP SUCTION I I I I I I I I -:. ,• ., .,,,"" .i,.. ~ ---- •' ~, ~, ____ , ... - --- ------ BOTTOM SEAL

  8. Capture Zones RAILWAY R/W PWWELL605 GROUND WATER FLOW ARROWS LEGEND • PW WELL 601 CJTYWEU. - WATER MAIN WA.TEAT~ NOPUW'now -+ PU M PING FLOW CIIPTURE ZONE 600AVS - I YEAR 5YEARS - 20YEARS - WATERTABLE CONTOURS ,ooom 250m 500r1 750m ELEV. (m) 1

  9. Predictive Contaminant Model 1 ( RAILWAY R/W LEGEND @) CllY WELL WATER NAIN WATERTA BLE NO PUMP FLOW - RAILWAY R/W PUMPING FLOW --+ CAPTURE ZONE 60 DAYS - CJ I YEAR D 5 Y EARS 20 YEARS - SPILL IMPACT AREA O ~ m !!iiiil!!!!!!!!!!! 20 ~0-m _. 4 .0~ 0m !!!!!!!!!!~ 6 ~ 0~ 0m -.. 8 ~ 00ml

  10. Risk Matrix Consequence Likelihood 1 2 3 4 5 Insignificant Minor Moderate Major Catastrophic A (almost certain) Moderate High Very High Very High Very High B (likely) Moderate High High Very High Very High C (possible) Low Moderate High Very High Very High D (unlikely) Low Low Moderate High Very High E (rare) Low Low Moderate High High

  11. Risk Summary Potential Likelihood of Magnitude of Risk to Drinking Source Occurrence Consequence Water 2 (Minor) Future wells Derailments in D (Unlikely) would need to avoid Low CN yard the CN yard. 4 (Major) The City has Derailments on 3 active wells; Very High railway track C (Possible) therefore, loss of all (within 60 and train wells with one days**) collisions derailment is unlikely.

  12. Risk Summary Potential Likelihood of Magnitude of Risk to Drinking Source Occurrence Consequence Water 4 (Major) The City has 3 Very High Grade crossing active wells; therefore, C (Possible) (within 60 accidents loss of all wells with one days**) derailment is unlikely. 4 (Major) The City has 3 Well houses active wells; therefore, loss High (within 1 E (Rare) (train collision) of all wells with one day**) derailment is unlikely.

  13. Risk Summary Potential Likelihood of Magnitude of Risk to Drinking Source Occurrence Consequence Water Track maintenance D (Unlikely) 2 (Minor) Low chemicals Track switch C (Possible) 4 (Major) Very High

  14. Recommendations Preventative (P) Initiating High Priority Actions or Party Responsive (R) Remote pump shut ‐ down capabilities and procedures (for City R the wells) Emergency water quality monitoring plan (spill incident) City R Remote operation capabilities and procedures (for the City R wells) Additional studies (i.e. groundwater flow direction study; updating numerical flow model of capture zones near CN City P tracks) focusing on risk and mitigation options. Additions to City’s Groundwater Protection Areas City P (wellheads and Nechako River)

  15. Recommendations Preventative (P) Initiating High Priority Actions or Party Responsive (R) Reduction of train speeds CN P Creation of a joint emergency response committee (to Joint P provide emergency plans and a contact list) * Enhancement of track maintenance CN P

  16. Recommendations Preventative (P) Initiating Moderate Priority Actions or Party Responsive (R) Creation of alternate supply capability (redundancy for City P/R PW605) Greater transparency and improved communication Joint P Minimization/elimination of at grade crossings Joint P

  17. Recommendations Preventative (P) Initiating Additional Actions or Party Responsive (R) Advance notification if dangerous goods are being CN P/R transported Installation of at grade crossing arms Joint P Installation of a ground seal (significantly reduces speed of infiltration) – option to be determined based City P on additional studies Installation of interceptor wells and trenches – option to City P be determined based on additional studies

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