Montecito Sanitary Districts Response to the Thomas Fire 1/9 Debris - - PowerPoint PPT Presentation

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Montecito Sanitary Districts Response to the Thomas Fire 1/9 Debris - - PowerPoint PPT Presentation

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MONTECITO SANITARY DISTRICT Montecito Sanitary Districts Response to the Thomas Fire 1/9 Debris Flow Event July 17, 2018 MONTECITO SANITARY DISTRICT Outline of Presentation Background information on the District Overview of the

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MONTECITO SANITARY DISTRICT

Montecito Sanitary District’s Response to the Thomas Fire 1/9 Debris Flow Event

July 17, 2018

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MONTECITO SANITARY DISTRICT Outline of Presentation

  • Background information on the District
  • Overview of the Thomas Fire Debris Flow Event
  • Impacts on the District’s Collection System and

Treatment Plant

  • Preparedness Efforts for future Debris Flows
  • Plans for continuing NPDES Permit Compliance
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MONTECITO SANITARY DISTRICT Organization Chart

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MONTECITO SANITARY DISTRICT

Collection System

  • Located in unincorporated area of Santa Barbara County
  • 8.9 square mile service area
  • District serves estimated population of 9,000 people
  • District serves 3,109 properties
  • 75 miles of sewer main
  • Rehabilitated 26 miles of sewer main
  • 2,034 manholes and cleanouts
  • 4 sewer lift stations
  • Zero District sanitary sewer overflows (SSO) from Dec.

2015 to Jan. 9, 2018

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MONTECITO SANITARY DISTRICT

Treatment Plant

  • NPDES Permit No. CA0047899, Order No. R3‐2012‐0016,

Administrative Extension Issued February 7, 2018;

  • 1.5 MGD permitted capacity
  • Full secondary treatment
  • 550,000 gpd Average Daily Flow prior to Thomas Fire
  • 450,000 gpd currently
  • Ocean outfall 1,500 feet long in 35 feet of water to the

Pacific Ocean

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MONTECITO SANITARY DISTRICT District Service Area

District Boundary Sewer Lift Stations MSD Sewer Treatment Plant

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MONTECITO SANITARY DISTRICT Jan 8th Evacuation Order

Mandatory Evacuation Voluntary Evacuation

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MONTECITO SANITARY DISTRICT

View of Highway 101 looking west from Olive Mill Road overpass

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MONTECITO SANITARY DISTRICT

Channel Drive Lift Station #1

Mud in Electrical Room

  • f Sewer Lift Station
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MONTECITO SANITARY DISTRICT

Posilipo Lane Lift Station #4

Mud in Dry Well of Sewer Lift Station

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MONTECITO SANITARY DISTRICT

Debris and Hazards at Hot Springs Road

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MONTECITO SANITARY DISTRICT

Mud and Debris in Sewer Easement south of Glen Oaks Neighborhood

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MONTECITO SANITARY DISTRICT 1/9 Debris Flow Event

Summerland Sanitary District Pacific Ocean City of Santa Barbara National Forest

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MONTECITO SANITARY DISTRICT

Morning meeting with MSD Operations Staff and Inspectors to discuss locations for days work

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Once sewer manholes were located, Blois Construction (hired by MSD) cleared debris so manholes could be assessed for damage or debris in pipelines

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MONTECITO SANITARY DISTRICT

Blois Construction (hired by MSD) cleared debris so access to manholes within our easement could be assessed for damage or debris in pipelines

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MONTECITO SANITARY DISTRICT

Blois Construction (hired by MSD) cleared debris and marked the sewer manholes in green so manholes could be assessed for damage or debris in pipelines

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MONTECITO SANITARY DISTRICT

Sewer manhole marked in green so manholes could be assessed for damage or debris in pipelines

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MSD Staff and Inspectors opened

  • ver 1,900 sewer

manholes to see if manhole was damaged or if debris is in the pipeline below

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MONTECITO SANITARY DISTRICT Condition Assessment

MSD Staff and Inspectors assessed sewer collection system (manholes and pipelines) to create daily maps

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MONTECITO SANITARY DISTRICTCondition Assessment

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MSD hired National Plant Services to clean the debris from the sewer manholes and pipelines based on the condition assessment mapping

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MONTECITO SANITARY DISTRICT

MSD hired National Plant Services to clean the debris from the sewer manholes and pipelines

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MSD hired National Plant Services to clean the debris from the sewer manholes and pipelines‐ this is an example of the debris that was removed

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MONTECITO SANITARY DISTRICT

National Plant Services brought the mud and debris from the sewer manholes and pipelines to the MSD Sewer Treatment Plant to be processed

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MONTECITO SANITARY DISTRICT

MSD hired National Plant Services to video inspect the pipelines to confirm debris was removed and assess the pipeline condition

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MONTECITO SANITARY DISTRICT

Video Inspection shows debris in 8” VCP sewer pipeline

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MONTECITO SANITARY DISTRICT

Video Inspection shows 6” rock in 8” sewer pipeline

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MONTECITO SANITARY DISTRICT

COLLECTION SYSTEM DAMAGE‐ MONTECITO CREEK

Sewer Pipeline Break Sewer Pipeline full of Debris Sanitary Sewer Overflow (due to storm water intrusion and debris blocked pipes)

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MONTECITO SANITARY DISTRICT

Montecito Creek DAMAGED MANHOLE AND PIPELINE

Sewer Manhole ripped apart Lined Sewer Pipeline ripped apart

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MONTECITO SANITARY DISTRICT

MONTECITO CREEK REPAIRS UNDERWAY

Sewer Manhole ripped apart marked in green Blois Construction, hired by MSD, repaired sewer pipeline and manhole

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MONTECITO SANITARY DISTRICT

MONTECITO CREEK REPAIRS UNDERWAY

Blois Construction, hired by MSD, encased the sewer pipeline in concrete

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MONTECITO SANITARY DISTRICT

MONTECITO CREEK TODAY

Blois Construction, hired by MSD, repaired manhole, protected manhole with rocks, and concrete encased sewer pipeline

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MONTECITO SANITARY DISTRICT

COLLECTION SYSTEM DAMAGE‐ SAN YSIDRO CREEK

Sewer Pipeline Break Sewer Pipeline full of Debris Sanitary Sewer Overflow (due to storm water intrusion and debris blocked pipes)

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MONTECITO SANITARY DISTRICT

SAN YSIDRO CREEK UNDER EAST VALLEY ROAD BRIDGE DAMAGED PIPELINE

Sewer pipeline and encasement ripped apart Boulders already broken apart by Caltrans Caltrans and County Flood Control granted MSD a 48 hour time period to complete the pipeline repairs

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MONTECITO SANITARY DISTRICT

SAN YSIDRO CREEK UNDER EAST VALLEY ROAD BRIDGE SEWER PIPE IN CASING

MSD hired Blois Construction to complete repairs Blois Construction, hired by MSD, installed 8” PVC gravity pipe in a steel casing that will be encased in reinforced concrete

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MONTECITO SANITARY DISTRICT

SAN YSIDRO CREEK UNDER EAST VALLEY ROAD BRIDGE REBAR FOR CONCRETE ENCASEMENT

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MONTECITO SANITARY DISTRICT

SAN YSIDRO CREEK UNDER EAST VALLEY ROAD BRIDGE CONCRETE ENCASEMENT

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MONTECITO SANITARY DISTRICT

San Ysidro Creek under East Valley Road Bridge ENCASED PIPELINE

Repaired concrete encased sewer pipeline

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MONTECITO SANITARY DISTRICT

San Ysidro Creek under East Valley Road Bridge TODAY

The concrete encased sewer pipeline is below the natural creek channel

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MONTECITO SANITARY DISTRICT

COLLECTION SYSTEM DAMAGE‐ ROMERO CREEK

Sewer Pipeline Break Sewer Pipeline full of Debris Sanitary Sewer Overflow (due to storm water intrusion and debris blocked pipes)

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MONTECITO SANITARY DISTRICT Romero Creek

ROMERO CREEK DAMAGED PIPELINE

MSD hired Blois Construction to repair the damaged concrete encasement surrounding the sewer main

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MONTECITO SANITARY DISTRICT Romero Creek

ROMERO CREEK REPAIRED PIPELINE AND ENCASEMENT

Blois Construction repaired the damaged concrete encasement surrounding the sewer main

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MONTECITO SANITARY DISTRICT

ROMERO CREEK ENCASED PIPELINE TODAY

Repaired concrete encasement around sewer pipeline

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MONTECITO SANITARY DISTRICT MSD Treatment Plant

Aeration basins (biological treatment process) Dissolved Air Flotation Thickener (solids handling) Secondary Clarifiers (clarification) During the January 9th Thomas Fire Debris Flow event, MSD treatment plant was NOT directly impacted by the debris flows. However, there was debris that entered the treatment plant by flowing through the sewer collection system. Influent Pump Station Chlorine Contact Basin (disinfection) Aerobic Digester (solids handling) Belt Press (solids handling)

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MONTECITO SANITARY DISTRICT Influent Flow

January 9, 2018 Typical Day Typical day influent is tan in color, has a trace amount of solids material, and has a musty odor On the morning

  • f the debris flow

influent was a blackish‐brown slurry and had an earthy odor; the debris in the collection system was making its way to the treatment plant. This is what the influent flow looked like for weeks.

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MONTECITO SANITARY DISTRICT Inorganic Material in

Treatment Plant

Debris Flow Typical inorganic material (sand, plastics, etc.) Over the next 3 weeks, we took in 12 tons of grit, mud, sand, and silt. From then it took 6 months for our system to fully recover. We had to very gradually pump out the inorganic solids, only as our biological treatment process began to heal, re‐ populate, and thrive again. This was a prolonged recovery period because

  • f the drastic flow

reductions.

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MONTECITO SANITARY DISTRICTPlant Flow (gallons per day)

Thomas Fire Debris Flow Before the fire, our average plant flow was 550,000 gallons per day. During the evacuations, fewer residents meant less toilet flushing, less showering, less water down the drains, and ultimately less wastewater into the treatment plant. ALL TIME low flow Flows have returned to 450,000 gallons per day

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MONTECITO SANITARY DISTRICT Adapting to flow

reduction

With very low flows to the treatment plant both the hydraulic and the solids residence times in these tanks were far beyond our target

  • ranges. As the flow into the

plant dropped below half of normal, we took half of our tanks offline. As you can see with the red X, we took an aeration basin

  • ffline, followed by two

clarifiers.

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MONTECITO SANITARY DISTRICT

One Aeration Basin Offline

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MONTECITO SANITARY DISTRICT

Secondary Clarifier Offline

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MONTECITO SANITARY DISTRICT Sustaining Plant Microbiology

Once we adapted to the low flows, our next challenge was sustaining the health of

  • ur plant microbiology.

Our treatment process is absolutely reliant on living, breathing microorganisms that we receive regularly when we are receiving human sanitary sewer waste. These microorganisms, among others, are what we like to see. When these microorganisms are thriving, our treatment performance is at its best. Stalked Ciliates

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MONTECITO SANITARY DISTRICT

Preventing Worms

These worms are associated with sub‐

  • ptimal treatment
  • performance. After the

debris flow, we were striving to prevent these worms by maintaining the healthy, beneficial microorganisms that ultimately keep us in permit compliance. Human sanitary sewer waste is the food that good microorganisms need to eat in order to

  • live. After the debris flow,
  • ur microorganisms were

basically starving.

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MONTECITO SANITARY DISTRICT Sustaining Plant Microbiology

We needed a supplemental food source to keep the healthy microorganisms

  • alive. We added

dogfood as an alternative food source. In the wastewater industry, it is not uncommon to use dogfood in this

  • application. We

supplemented with dogfood for 17 days (150 lbs per day) until Montecito was repopulated and the plant started to receive human sanitary sewer waste again.

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MONTECITO SANITARY DISTRICT Analyzing Trends

Debris Flow Typically 2‐4 NTU 58 NTU Water Clarity Effective adjustments: Increased polymer dose to aid with particle settling and increased chlorine dose to strengthen disinfection.

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MONTECITO SANITARY DISTRICT Effluent Turbidity

Debris Flow Permit Limit

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MONTECITO SANITARY DISTRICT Total Coliform

5 10 15 20 25

MPN / 100 mL

EFFLUENT Total Coliform Monthly 7‐day Median

Total Coliform 7 day Median Total Coliform 7 day Median Limit

Debris Flow Permit Limit This is the performance metric that could shut down local beaches if we exceed the 23 MPN, 7‐day median permit limit.

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MONTECITO SANITARY DISTRICT

Effluent TSS

5 10 15 20 25 30 mg/L

EFFLUENT Monthly Average Total Suspended Solids

Monthly Average Total Suspended Solids Montly TSS Permit Limit

Debris Flow Permit Limit

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MONTECITO SANITARY DISTRICT Effluent CBOD

5 10 15 20 25 30 mg/L

EFFLUENT Monthly Average CBOD

Monthly Average CBOD Monthly CBOD Permit Limit

Permit Limit Debris Flow

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MONTECITO SANITARY DISTRICT

Effluent Flow Discharged to the Ocean

January 9, 2018 Typical Day Effluent is crystal clear Effluent is quite clear

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MONTECITO SANITARY DISTRICT Repopulation following

Debris Flow

  • January 21st ‐ Highway 101 reopens after removing

105,000 cubic yards of material with 40 pieces of equipment and 1,500 trucks

  • January 23rd all repairs to Collection system

completed

  • January 23rd ‐ Repopulation of Montecito begins
  • January 30th ‐ Repopulation of Montecito complete
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MONTECITO SANITARY DISTRICT

Risk Areas

(Loss of Life or Property)

Thomas Fire Area Extreme Risk High Risk All MSD Sewer Lift Stations located in Extreme Risk areas MSD Treatment Plant

  • utside of Risk areas
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MONTECITO SANITARY DISTRICT

Recent Evacuations

  • Thursday, March 1st 6 PM – Mandatory evacuation

for all of Montecito, evacuation lifted next day

  • Monday, March 12th 8 PM – Mandatory evacuation

for extreme risks areas, evacuation lifted next day

  • Tuesday, March 20th 5 PM‐ Mandatory evacuation

for all of Montecito, evacuation lifted March 22nd at 5 PM

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MONTECITO SANITARY DISTRICT

Preparations

  • Leased Vactor
  • Lateral Cap Locations
  • Pipeline Protectors in Manholes
  • Sand Bags
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MONTECITO SANITARY DISTRICT

Leased Sewer Cleaning Machine

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MONTECITO SANITARY DISTRICT

Capped Laterals

Capped laterals at about 67 properties

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MONTECITO SANITARY DISTRICT

Pipeline Protectors

If the manhole lid floats away during a future debris flow the protector would capture the debris and prevent it from entering the pipeline system. The protector is foldable for easy installation.

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MONTECITO SANITARY DISTRICT

Pipeline Protectors

The plywood sits on the manhole concrete shelf which allows sewer to continue flow to the next pipeline. Protectors can be lowered by one person without having to enter the manhole.

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MONTECITO SANITARY DISTRICT

Sand Bags

In February sand bags were placed to prevent future debris flows from entering the lift station. The sand bags were removed in May after the rainy season.

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MONTECITO SANITARY DISTRICT On‐Site Diesel Storage

Diesel storage is located at the MSD Treatment Plant for the backup generator.

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MONTECITO SANITARY DISTRICT Backup Generator

Diesel Generator has an automatic transfer switch, is capable of powering the entire facility, and is tested monthly

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MONTECITO SANITARY DISTRICT Auxiliary Pump and Piping

An additional auxiliary pump and piping could be used if influent flow to the treatment plant or lift stations are very high.

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MONTECITO SANITARY DISTRICT

Plans for FY‐2018‐2019

  • Preparations for potential future debris flows
  • FEMA reimbursement
  • Continue full NPDES permit compliance
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MONTECITO SANITARY DISTRICT

Questions

Please call Diane Gabriel, General Manager at 805‐969‐4200