Hurricane Irene Impacts One Year Later Paul V. Rush, P.E. Deputy - - PowerPoint PPT Presentation

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Hurricane Irene Impacts One Year Later Paul V. Rush, P.E. Deputy - - PowerPoint PPT Presentation

Dec 12, 2022 269 likes •455 views

Hurricane Irene Impacts One Year Later Paul V. Rush, P.E. Deputy Commissioner Bureau of Water Supply Outline Introduction Infrastructure Repairs Water Quality Issues & System Response Kensico Reservoir

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Hurricane Irene Impacts “One Year Later”

Paul V. Rush, P.E. Deputy Commissioner – Bureau of Water Supply

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Outline

  • Introduction
  • Infrastructure Repairs
  • Water Quality Issues & System Response
  • Kensico Reservoir
  • Moving Forward

8/31/2011

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Gilboa Dam

8/29/2011 7/9/2012

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Gilboa Dam Repairs – channel step

Completed repair

  • $10.7 million in repairs
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BWS Infrastructure

  • Tannersville Wastewater Treatment Plant

8/31/11 8/24/12

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Ashokan Reservoir

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Rondout Reservoir

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Reservoir Water Quality

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Water Supply System Response

  • Alum Treatment on the Catskill Aqueduct
  • Started on 9/29/11
  • Ended on 5/15/12
  • Used approximately 2,778 dry tons
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Ashokan Reservoir

Interim Operating Protocol in effect 10/17

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Water Supply System Response

  • Shaft 10 Chlorination
  • Shaft 17 Dechlorination

Shaft 17 Shaft 17

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Source Water Fecal Coliform

  • Surface Water Treatment Rule for unfiltered systems requires:
  • No more than 10% of samples can exceed 20 cfu/100 mL
  • Rolling 6 month average
  • DEP source identification analyses indicated predominantly non-

human (e.g. wildlife) sources

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Fecal Coliform Issues

2 4 6 8 10 1 10 100 1,000 Jan‐11 Feb‐11 Mar‐11 Apr‐11 May‐11 Jun‐11 Jul‐11 Aug‐11 Sep‐11 Oct‐11 Nov‐11 Dec‐11 Jan‐12 Feb‐12 Mar‐12 Apr‐12 May‐12 Jun‐12 Jul‐12 Aug‐12

%>20 FC per 100 mL (6 month) FC per 100 mL

DEL18 Fecal Coliform Compliance

MAX COUNT AVG COUNT SWTR Limit % >20 CFU/100mL

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Fecal Coliform Issues

2 4 6 8 10 1 10 100 1,000 Jan‐11 Feb‐11 Mar‐11 Apr‐11 May‐11 Jun‐11 Jul‐11 Aug‐11 Sep‐11 Oct‐11 Nov‐11 Dec‐11 Jan‐12 Feb‐12 Mar‐12 Apr‐12 May‐12 Jun‐12 Jul‐12 Aug‐12

%>20 FC per 100 mL (6 month) FC per 100 mL

CATLEFF Fecal Coliform Compliance

MAX COUNT AVG COUNT SWTR Limit % >20 CFU/100mL

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Kensico Reservoir Assessment Report

  • DEP actions based on report:
  • Develop a Hurricane Preparation Protocol
  • Ensure flushing of the Delaware Aqueduct Bypass

prior to hurricane season

  • Inspect and clean BMPs prior to hurricane season
  • Prepare contracts for chemical treatments in case

needed

  • Developed protocol for Kensico storm event

monitoring:

  • Implemented during significant rain events
  • Identify sources of fecal coliform
  • Identify areas of highest fecal coliform load

Fecal Coliform Occurrence, and Operational Response During and After Tropical Storms Irene and Lee

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Moving Forward

  • System operated in full compliance despite impacts
  • Significant repairs made to system infrastructure
  • Learn from response:
  • Completed study on fecal coliform issue at Kensico
  • AAR completed
  • Improvement plan developed
  • Ensure plans turn into actions

Pepacton 8/29/11

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