MONTECITO SANITARY DISTRICT Montecito Sanitary District’s 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 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
MONTECITO SANITARY DISTRICT Organization Chart
Collection System MONTECITO SANITARY DISTRICT • 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
Treatment Plant MONTECITO SANITARY DISTRICT • 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
MONTECITO SANITARY DISTRICT District Service Area District Boundary MSD Sewer Treatment Plant Sewer Lift Stations
MONTECITO SANITARY DISTRICT Jan 8 th Evacuation Order Mandatory Evacuation Voluntary Evacuation
MONTECITO SANITARY DISTRICT View of Highway 101 looking west from Olive Mill Road overpass
Channel Drive Lift Station #1 MONTECITO SANITARY DISTRICT Mud in Electrical Room of Sewer Lift Station
Posilipo Lane Lift Station #4 MONTECITO SANITARY DISTRICT Mud in Dry Well of Sewer Lift Station
MONTECITO SANITARY DISTRICT Debris and Hazards at Hot Springs Road
MONTECITO SANITARY DISTRICT Mud and Debris in Sewer Easement south of Glen Oaks Neighborhood
MONTECITO SANITARY DISTRICT 1/9 Debris Flow Event National Forest City of Santa Barbara Summerland Sanitary District Pacific Ocean
MONTECITO SANITARY DISTRICT Morning meeting with MSD Operations Staff and Inspectors to discuss locations for days work
Once sewer manholes were located, Blois Construction (hired by MSD) cleared debris so manholes could be assessed for damage or debris in pipelines
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
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
MONTECITO SANITARY DISTRICT Sewer manhole marked in green so manholes could be assessed for damage or debris in pipelines
MSD Staff and Inspectors opened over 1,900 sewer manholes to see if manhole was damaged or if debris is in the pipeline below
MONTECITO SANITARY DISTRICT Condition Assessment MSD Staff and Inspectors assessed sewer collection system (manholes and pipelines) to create daily maps
MONTECITO SANITARY DISTRICT Condition Assessment
MSD hired National Plant Services to clean the debris from the sewer manholes and pipelines based on the condition assessment mapping
MONTECITO SANITARY DISTRICT MSD hired National Plant Services to clean the debris from the sewer manholes and pipelines
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
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
MONTECITO SANITARY DISTRICT MSD hired National Plant Services to video inspect the pipelines to confirm debris was removed and assess the pipeline condition
MONTECITO SANITARY DISTRICT Video Inspection shows debris in 8” VCP sewer pipeline
MONTECITO SANITARY DISTRICT Video Inspection shows 6” rock in 8” sewer pipeline
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)
Sewer Manhole ripped apart MONTECITO SANITARY DISTRICT Montecito Creek DAMAGED MANHOLE AND PIPELINE Lined Sewer Pipeline ripped apart
MONTECITO SANITARY DISTRICT MONTECITO CREEK Sewer Manhole ripped apart marked in green REPAIRS UNDERWAY Blois Construction, hired by MSD, repaired sewer pipeline and manhole
MONTECITO SANITARY DISTRICT MONTECITO CREEK REPAIRS UNDERWAY Blois Construction, hired by MSD, encased the sewer pipeline in concrete
MONTECITO SANITARY DISTRICT MONTECITO CREEK TODAY Blois Construction, hired by MSD, repaired manhole, protected manhole with rocks, and concrete encased sewer pipeline
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)
Boulders already MONTECITO SANITARY DISTRICT broken apart by Caltrans SAN YSIDRO CREEK UNDER EAST VALLEY ROAD BRIDGE DAMAGED PIPELINE Caltrans and County Flood Control granted MSD a 48 hour time Sewer pipeline period to complete the and encasement pipeline repairs ripped apart
MONTECITO SANITARY DISTRICT SAN YSIDRO CREEK UNDER EAST VALLEY ROAD BRIDGE SEWER PIPE IN CASING MSD hired Blois Construction to Blois Construction, hired by MSD, installed 8” PVC complete repairs gravity pipe in a steel casing that will be encased in reinforced concrete
MONTECITO SANITARY DISTRICT SAN YSIDRO CREEK UNDER EAST VALLEY ROAD BRIDGE REBAR FOR CONCRETE ENCASEMENT
MONTECITO SANITARY DISTRICT SAN YSIDRO CREEK UNDER EAST VALLEY ROAD BRIDGE CONCRETE ENCASEMENT
MONTECITO SANITARY DISTRICT San Ysidro Creek under East Valley Road Bridge Repaired concrete encased sewer pipeline ENCASED PIPELINE
MONTECITO SANITARY DISTRICT San Ysidro Creek under East Valley Road Bridge TODAY The concrete encased sewer pipeline is below the natural creek channel
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)
MONTECITO SANITARY DISTRICT Romero Creek ROMERO CREEK DAMAGED PIPELINE MSD hired Blois Construction to repair the damaged concrete encasement surrounding the sewer main
MONTECITO SANITARY DISTRICT Romero Creek ROMERO CREEK REPAIRED PIPELINE AND ENCASEMENT Blois Construction repaired the damaged concrete encasement surrounding the sewer main
MONTECITO SANITARY DISTRICT ROMERO CREEK ENCASED PIPELINE Repaired concrete TODAY encasement around sewer pipeline
MONTECITO SANITARY DISTRICT MSD Treatment Plant Belt Press (solids handling) Secondary Chlorine Clarifiers Influent (clarification) Contact Basin Pump (disinfection) Station Aerobic Digester During the January 9 th (solids handling) 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 Aeration basins Dissolved Air flowing through the (biological Flotation Thickener sewer collection treatment process) (solids handling) system.
MONTECITO SANITARY DISTRICT Influent Flow On the morning of the debris flow influent was a Typical day blackish ‐ brown influent is tan in slurry and had an color, has a trace earthy odor; the amount of solids debris in the material, and has collection system a musty odor was making its way to the treatment plant. This is what the influent flow looked like for weeks. January 9, 2018 Typical Day
MONTECITO SANITARY DISTRICT Inorganic Material in Treatment Plant Over the next 3 weeks, we took in 12 This was a prolonged tons of grit, mud, sand, and silt. From recovery period because then it took 6 months for our system of the drastic flow to fully recover. We had to very reductions. gradually pump out the inorganic solids, only as our biological treatment process began to heal, re ‐ populate, and thrive again. Typical inorganic material (sand, Debris plastics, etc.) Flow
MONTECITO SANITARY DISTRICT Plant Flow (gallons per day) Thomas Debris Fire Flow Flows have returned to Before the fire, our average plant 450,000 gallons flow was 550,000 gallons per day. per day During the evacuations, fewer residents meant less toilet flushing, less showering, less water down the drains, and ultimately less ALL TIME wastewater into the treatment plant. low flow
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 offline, followed by two clarifiers.
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