Sanitary Sewer Overflow ReportSanitary Sewer Overflow Report
Spill Category (click
each to see
description)
Category 1
Discharge of untreated or partially treated wastewater of any volume resulting from a sanitary sewer system failure or flow
condition that either (1) Reaches surface water and/or drainage channel tributary to a surface water; OR (2) Reached a
Municipal Separate Storm Sewer System (MS4) and was not fully captured and returned to the sanitary sewer system or
otherwise captured and disposed of properly.
Describe in detail the
basis for choosing
that category:
Check if applicable:
Spill Location Name
Geolocation
Street Name and
Number
City
Zipcode
County:
Nearest Cross Street
Spill Location
description
Category 1
Category 2
Category 3
Spill From Private Lateral
On 7/28/2024 at 12:19 am a discharge line at Pump Station FL9 had ruptured. The
result of this had caused the discharge plumbing for the pump to become
disconnected and an inline ball valve to break. Additionally because the discharge
was disconnected including the check valves there was no way to shut off water to
operate either pump and sewage was flowing back into the wet well. The result was
a surcharging wet well that made its way back into gravity sewer and spilled into the
road. The spill had started at 12:11 am and a crew with a Vactor truck had showed
up on sight at 12:19 am. The spill had gone for 8 minutes until the Vactor truck
began vacuuming (sucking) the Pump Station wet well. Pumps crew showed up to
conduct a confined space entry, install a new ball valve and plumbing to remedy the
issue. The total volume of the spill was approximately 40-50 gallons and the volume
that had reached Fallen Leaf Lake was approximately 5-10 gallons. There was a full
clean up effort and currently the lab is taking samples.
IMMEDIATE NOTIFICATION: If this is a Category 1 spill, contact CalOES within 2
hours at (800) 852-7550.
Spill Location
FL9 Pump Station
38.8822345, -120.0611749
FALLEN LEAF RD
South Lake Tahoe
96150
El Dorado
Price Ln
In front of 544 Fallen Leaf Rd
Spill Description
Spill Appearance
Point (check one or
more):
Did the spill reach a
drainage channel
and/or surface water?
If the spill reach a
storm sewer, was it
fully captured and
returned to the
Sanitary Sewer?
Was this spill from a
private lateral?
Discharged into:
Provide name(s) of
affected drainage
channels, beach, etc.:
Total Estimated spill
volume (in gallons –
1,000gal or more =
Category 1):
Est. volume that reached a separate storm drain that flows to a surface water body:
Gallons Recovered Gallons
Est. volume that reached a drainage channel that flows to a surface water body:
Gallons
Recovered Gallons
Est. volume discharged directly to a surface water body:
Building/Structure
Force Main
Gravity Sewer
Pump Station
Other Sewer System (i.e. cleanout)
Manhole-Structure ID#
Other
YES (Category 1)
NO
YES
NO (Category 1)
YES
NO
Ocean/ocean beach
Waters of the State other than ocean
Drainage Channel
Combined storm drain
Separate storm drain
Paved surface
Unpaved surface
Building/structure
Street/curb/gutter
Other
Fallen Leaf Lake
50
0 0
0
0
Gallons
Recovered Gallons
Est. volume discharged to land:
Gallons
Recovered Gallons
Calculation Methods:
NOTE: Attach all Spill Volume Estimation documentation including calculations and summary.
Estimated spill start
date and time
Date and time spill
reported to crew
Date and time crew
arrived
Who was interviewed
to help determine
start time?
Date and time spill
ended
NOTE: Attach detailed start time determination documentation.
Location Blockage
10
0
50
40
Eyeball
Photo Comparison
Upstream Connections
Area/Volume
Lower Lateral
Other
Spill Occurring Time
7/28/2024
12:11:00 AM
7/28/2024
12:11:00 AM
7/28/2024
12:19:00 AM
Joseph Stumph
7/28/2024
12:19:00 AM
Cause of Spill
Main
Lateral
Private Lateral
Other Pump Station Failure
SSO Cause (check all
that apply)
Weather conditions
prior 72 hours
If SSO is caused by
wet weather, choose
size of storm
Diameter (in inches)
of pipe at point of
blockage/spill cause
(if applicable):
Sewer pipe material
at point of
blockage/spill cause
(if applicable):
Estimated age of
sewer asset at the
point of blockage or
failure (if applicable):
Description of terrain
surrounding point of
blockage/spill cause:
Spill response
activities (check all
that apply):
Spill response
completed (date &
time):
Visual inspection
result of impacted
waters (if applicable)
Debris/Blockage Flow exceeded capacity
Grease Operator error
Roots Animal Carcass
Pump station failure Rainfall exceeded design
Vandalism Inflow/infiltration
Pipe Problem/failure Pump station failure (1)
Bypass Debris from laterals
Construction Debris Other
Sunny Weather
Cloudy Weather
Measurable Rain
Rain for Several Days
1-yr 2-r
5-yr 10-yr
50-yr 100-yr
>100-yr Unknown
6
Flat
Mixed
Steep
Spill Response
Cleaned up
Contained all/portion of spill
TV Inspection
Restored Flow
Returned all/portion to sanitary sewer
Other
7/28/2024
09:00:00 AM
Approximately 5 gallons made it to Fallen
Leaf Lake
Any fish killed?
Any ongoing
investigation?
Were health warnings
posted?
If yes, provide health
warning/beach
closure
posting/details:
Was there a beach
closure:
Were samples of
impacted waters
collected?
If YES, select the
analyses:
Recommended
corrective actions:
(check all that apply)
Provide details for
recommended
corrective actions:
List all agency personnel involved
YES
NO
YES
NO
YES
NO
Sewer Spill signs are currently posted.
YES
NO
YES
NO
DO Ammonia
Bacteria pH
Temperature Other
Clean line again ASAP CCTV
Re-CCTV Additional work
Cleaning schedule change Cleaning Method change
Fog investigation Repair line segment
Replace line segment
Pumps crew repaired plumbing.
Name
Title
Role
Joseph Stumph
Field Operations Mechanical Technician II
First to respond
Name
Title
Role
Daniel Diridoni
Underground Sewer Repair I
Sewer Stand-by
Name
Title
Role
Cavin Ross
Underground Sewer Repair Lead Person
Mitigate and spill response
CalOES contacted
date and time
CalOES Contol
Number
Spoke to
Name
Title
Role
Juan Marquez
Underground Sewer Repair II
Mitigate and spill response
Name
Title
Role
Richard Jones
Underground Sewer Repair Supervisor
Oversee spill
Name
Title
Role
Mike Chieffo
Field Operations Mechanical Technician Lead
Pump repairs
Name
Title
Role
Ron Goralski
Field Operations Mechanical Technician II
Pump repairs
Name
Title
Role
Corey Corbin
Field Operations Mechanical Technician II
Pump Repairs
Name
Title
Role
Chris Stanley
Field Operations Manager
Spill follow up
Name
Title
Role
Adrian Combes
Director of Operations
Spill follow up
Notification Details
7/28/2024
01:00:00 AM
Current PM
Frequency:
Date of last PM
Recommended
Actions
Notes:
Photos of Spill
Recommended Follow-Up Actions to Prevent Future Occurrences
TV
Re-Run
Change cleaning schedule
Repair line segment
Replace line segment
Other replace valves in wet well
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