Tropical Storm Debby Sanitary Sewer Overflows

• Estimated total spill of 90,000 gallons with 9,000 gallons recovered via vac truck
• Estimate $17,000 cost of labor, Vactor and lime during sanitary sewer overflow

• Estimated total spill of 178,500 gallons with 12,000 gallons recovered
• Estimate $19,000 cost of labor, Vactor and lime during sanitary sewer overflow

• Estimated total spill of 767,250 gallons with 54,000 gallons recovered
• Estimate $16,000 cost of labor, Vactor and lime during sanitary sewer overflow

• Estimated total spill of 31,500 gallons with 0 gallons recovered
• Estimate $2,000 cost of labor and lime during sanitary sewer overflow

• Estimated total spill of 130,650 gallons with 0 gallons recovered
• Estimate $2,000 cost of labor and lime during sanitary sewer overflow

• Estimated total spill of 93,000 gallons with 0 gallons recovered
• Estimate $2,000 cost of labor and lime during sanitary sewer overflow

• Estimated total spill of 3,480 gallons with 2,400 gallons recovered
• Estimate $2,000 cost of labor, Vactor and lime during sanitary sewer overflow

• Estimated total spill of 42,030 gallons with 7,500 gallons recovered.
• Estimate $2,000 cost of labor, Vactor and lime during sanitary sewer overflow

• Inflows from the collection system inundated the water reclamation facility, causing approximately 5.7 million gallons of partially treated wastewater to overflow the process tanks and to flow into the stormwater system, and ultimately, Old Tampa Bay.
• Normal flows are less than 2 MGD, but the influent flow exceed 10 MGD (MGD=million gallons per day).

• A Manhole overflow at the intersection of Russell Street and Holt Avenue, due to a VFD pump control failure at the Marshall Street Water Reclamation Facility.
• An estimated 24,000 gallons of untreated wastewater overflowed and 2,400 was recovered using vac trucks.
• Status of the issue
  • All of the Variable Frequency Drives (VFD) has been repaired
• Preliminary cost of mitigation plan (rough estimate)
  • $4,000 to repair variable frequency drives (VFDs)
  • Estimate $2,000 cost of labor, Vactor and lime during sanitary sewer overflow

There were two sanitary sewer overflows: Headworks and the Effluent Filters.

1. Headworks/Barscreens

• Untreated wastewater overflowed from the headworks building (Barscreens).
• The estimated spill volume is 63,000 Gallons with 0 recovered
• A Duke Power outage occurred. The Headworks were not connected to the onsite generator.

2. Effluent filters

• Due to a power failure at the Northeast WRF, effluent sand filters began overflow an estimate 5.93 million gallons of partially-treated wastewater at the clearwell and sand filter building structure. Flooding included the city’s property, the basement of the sand filter building, and reached the stormwater system that ultimately empties into Old Tampa Bay.
• Could not start onsite generator, called Ring Power (contractor) to start it.
• The filters were bypassed to bring back into service.

Status of the issue

• Both spills have been stopped
• Working to clean up spills and recover any flow that we can
• Emptying the Reject tank and the Equalization tank
• Spill has been abated

Impact of the issue

• Reclaim system was taken offline through Aug. 13, when the system was restored.
• Turbidity meter was in the basement and flooded.

Mitigation plan

• Bypass filters to get them back in service (stopped)
• Setting up pumps to recover what flow that we can
• Moving the Turbidity meter out of the basement

Preliminary cost of mitigation plan (rough estimate)

• Cost to relocate turbidimeter $5,000
• Rental generator $42,000 per month
• Repair of generator $10,000
• Connect of Headworks to generator $5,000
• Cost of Ring power to start onsite generator $5,000

• Failure of pump station controls resulting in overflows of 10 manholes in the upstream sewer on Jeffords Street, Hillcrest Avenue, and Barry Street.
• Status of the issue
  • Lift station is back online, and the sanitary sewer overflows abated.
  • Lift station went offline at approximately 1 p.m. and was returned to service around 3:10 p.m. Overflowing manholes were vacuumed up to the extent possible, and lime was applied to the affected areas.
• An estimated 50,625 gallons was released, and 3,000 gallons was recovered by vac trucks.
• Lift station pump controls have been replaced