HomeMy WebLinkAbout5-day report by Jacobs Engineering IDAHODepartment of Environmental Quality
Facility name, Permit ID# : Twin Falls, City of - Twin Falls WWTP, ID0021270
F- The facility experienced an extreme environmental event resulting in too many noncompliance events to count.
1. Noncompliance Period Start and End Dates :
Start date of noncompliance: 7/16/2024
End date of noncompliance: 7/16/2024
Discharge to waters of the US?
(.- Yes (- No
2. Sewer Overflow/Bypass Outfall Information
For each individual sewer overflow or bypass please identify the asscociated permitted feature(s)(if any) OR the latitude and longitude
Permitted
Sewer Overflow/Bypass Sewer Overflow/Bypass Feature Sewer Overflow/Bypass
Unique Identifier Reporting Requirement Associ Number ated with a NOT Associated with Permitted Feature Identify the pollutant(s)that exceed limit(s)
Sewer
OverFlow/Bypass
1 5 day reporting noncompliance Outfall 001 42.56279 Flow
-114.49412
3. Sewer Overflow/Bypass Information
Please provide the following information for each Sewer OverFlow/Bypass Unique Identifier
Type of Sewer
Treatment Duration of Sewer Overflow/ Bypass Overflow/Bypass Receiving
Sewer Sewer
of Outfall Type of Sewer Discharge Volume Select Type of Waterbody
(include Sewer Name
Overflow/Bypass Overflow/Bypass Overflow/ByPass A . Duration A . Start A . End Discharge all that Approx. PP rox pp rox Dischar e � OverFlow/Bypass for
Unique Identifier Category Structure of Sewer time and date of time and date of g Rate
apply) Volume By Weather Unpermitted
(Optional Overflow/Bypass Sewer Sewer (gallons) ( gallons Feature
field) (hours) Overflow/Bypass Overflow/Bypass per hr)
1 SSO none broken pipe 6.00 7/16/2024 7/16/2024 1666.00 Dry Rock Creek
5:31 AM 10:31 AM
4. Known or Likely Cause of Sewer Overflow/Bypass
Please indicate the known or likely cause(s) of the sewer overflow or bypass.
Select at least one cause for each 'Sewer Overflow/Bypass Unique Identifier'. Check all that apply.
Sewer Collection dw
System Problems
Mechanical Failure
Page 1 of 5
Sewer Collection 1
System Problems
Fats/Oil/Grease ❑
Pump Station Electrical m
Failure
Pump Station Capacity ❑
Inadequate Sewer ❑
System Capacity
Tree Roots ❑
Rags/wipes ❑
Debris ❑
High Levels of Inflow ❑
and/or Infiltration
Broken Pipe (due to
unforeseen W
circumstances)
Broken Pipe (caused by
construction or
maintenance activity)
Other
Plant Operation Problem
Plant Operation 1
Problems
Blockage at TWTDS r
Operations
Inadequate TWTDS
Capacity Due to
TWTDS Operatoring at
Design Capacity
Inadequate TWTDS
Capacity Due to ❑
Stormwater Event
Flooding of TWTDS
Due to Hurricane or ❑
Large Stormwater
Event
Flooding of TWTDS ❑
Due to Snowmelt
TWTDS Electrical ❑
Failure
Other
Page 2 of 5
S. Corrective Actions Taken or Planned for Sewer Overflow/Bypassess
Please indicate the corrective action(s) taken or planned for this sewer overflow or bypass.
Select at least one cause for each 'Sewer Overflow/Bypass Unique Identifier'. Check all that apply.
Short Term
Responsive Actions
e.g. Actions which 1
prevent sewage
from reaching water
of the state
Fix electrical problem
Street sweeping and r
cleaning, disinfection
Sewer flushing,
rodding,
blockage/debris
removal
Fix broken pipe o
Catch basin cleaning,
disinfection
Fix mechanical problem o
Limit access r
Post signs
None available
Other Bypass channel opened to relieve back pressure 200 characters maximum
Long Term
Corrective Actions
e.g. Actions which 1
prevent
reoccurances of
issues
Option specific to SSOs
Other Fix damaged sewer main pipe. 200 characters maximum
Options Specifics to All CSOs, SSO, and Bypasses
Sewer rehabilitation
Upgrade pump station
capacity
Public education
program
Increase routine 17
cleaning frequency
Page 3of5
Long Term
Corrective Actions
e.g. Actions which 1
prevent
reoccurances of
issues
Increase routine F
inspection frequency
Evaluate off-road
easement maintenance F
program
Pipe/manhole
rehabilitation/repair
Evaluate FOG control r
program
Perform hydraulic r
capacity analysis
Implement inflow and
infiltration Control F
Program
Pump station repair W
Pump station capacity r7
evaluation
Evaluation force main
maintenance/testing
procedures
Other 200 characters maximum
6. Known or Potential Impacts of Sewer Overflow/Bypasses
Please indicate the type of known or potential impacts of the reported sewer overflow/bypass event.
Select at least one cause for each 'Sewer Overflow/Bypass Unique Identifier'. Check all that apply.
Human Health
Impacts of Sewer 1
Overflow Event
Beach closures F
Odors
Shellfish bed closures
Drinking water
contamination
Fishing and shell El
-
fishing restrictions
Page 4 of 5
Human Health
Impacts of Sewer 1
Overflow Event
Sewage backup in
building (caused by
problem in sewer
collection system, not
private lateral)
Sewage on land
surface with potential
human exposure
(caused by problem in F
sewer collection
system, not private
lateral)
No effects
Other 200 characters maximum
Environmental
Impacts of Sewer 1
Overflow Event
Asethetic impairment F-
Aquatic life impairment ❑
Fish kills ❑
Aquatic habitat ❑
impairment
Eutrophication ❑
Algal blooms ❑
No effects
Other 200 characters maximum
7. Provide the estimated number of persons who came into contact with wastewater from the overflow. 0
8. Additional Information and Attachments
Please enter any additional information in the comment box below that you would like to provide.
Attachments: Scanned from a Xerox Multifunction Printer.pdf
Page 5of5
Is
.jaco s
July 18,2024
IPDES Program Manager
I DEQ Twin Fa lb Office
Water Quality Division
650 Addison Avenue West
Twin Falls, ID 83301
Re Twin Falls SSO, NPDES Permit #ID-002127-0
On July 15,2024,at approximately 9:00a.m.,we received a report thatthe Rock Creek Lift Station was overflowing
into the adjacent pasture.Upon arrival,our maintenance staff found that the lift station grinder motorwas running,
but the grinder blades were not turning.This caused the influent channel to back up into the west line,resulting in
sewage spilling onto the ground.To address the issue,the maintenance team diverted the flow around the grinder to
the manual rake bar screen,effectively reducing the flow level in the channel.By 10:30 a.m.,they had successfully
halted the spill.
Further investigation revealed that the gearbox motor coupler had slid up on the shaft and separated from the
grinder coupler.To prevent this from happening again,the couplers were removed,taken to a machine shop,and
equipped with set screws.
Additionally,we discovered that the high-level alarm system had not been triggered.Upon inspection,it was found
that the float wires going to the PLC were not properly connected.An electrician rectified this by installing the wires
and testing the floats to ensure they would alarm as designed.
The IPDES report line on July 16 at 7:22 a.m.,repotting an estimated spill of 5 to 10 thousand gallons into Rock
Creek. Samples were collected from Rock Creek and sent to the lab to be analyzed.
If you have any further questions,please contact me.
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'4?�Kc_
Dan Black
Project Ma na ger,Ja cobs
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in
accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted.
Based on the inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that
there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing
violations.
Check to certify you have read the above language and abide by the language and terms
Name: Daniel Black
Signature Date: 7/22/2024 10:43:22 AM