Topics

EXERCISE ONLY! Hazardous spill on the Monocacy River on 12/26/17

Carlton Haywood
 

EXERCISE ONLY! 

A spill of approximately 787,280 liters/hr of partially treated raw sewage for 4 hours into the Monocacy River has been reported. There was a power failure, and failure of backup power as well, at the Frederick WWTP beginning at 0100 hours on Jan. 23.  Additional information with travel times to intakes will be sent in a follow-up message shortly. NOTE: Some utilities and agencies receiving this message are upstream of the spill but are included for information purposes.

Please acknowledge receipt by replying to this message.

Carlton


  
 
 

Carlton Haywood
 

EXERCISE ONLY!   
FOR THIS EXERCISE - REPLY TO THIS MESSAGE TO ACKNOWLEDGE RECEIPT  PROVIDE ANY COMMENTS ABOUT THE MESSAGE:  READABILITY, CONFUSING POINTS, INFO MISSING, ETC.

ICPRB staff have completed an initial assessment of travel times to downstream intakes for this event. Further updates will be provided as needed.  Reply to this message if you have any questions or have additional information to share. 

Initial spill event occurred on 01/23/18 at 0100 hours.
Spill material: partially treated raw sewage
Spill duration: 4 hours
Location:  39.425495, -77.379118.  Paste this Lat. and Long. into Google Maps to see spill location.
Water temperature at Little Falls is 3 deg. C

Event description: A power failure at the Frederick WWTP caused partially treated sewage to be discharged into the Monocacy River for 4 hours.  The spill was modeled with a bacteria concentration equivalent to CSO flows. 

Estimated arrival times and peak concentrations at downstream intakes after spill on 01/23/18 at 0100 hours.
- Arrival estimates are rounded to the nearest half hour.
- Travel times and concentrations are estimates and should be used solely as guidelines.
- Peak concentration values do not include pre-spill ambient concentrations.
- Each utility should monitor actual water conditions.
- See model assumptions below to properly interpret travel time and concentration estimates." 

Unless otherwise indicated, the model is based on the following assumptions:
1. Spill material is dissolved and instantly and uniformly mixed across a stream channel and through the water column at the initial spill point and also when a tributary joins a larger stream.
2. Spill material is either conservative or, if there are losses due to volatilization, chemical decay, or deposition, then those losses may be represented as an exponential decay process.
3. Streamflows are constant throughout the modeled time period.
4. Bacteria concentrations are modeled with a temperature-dependent exponential decay.

In addition to the above assumptions, very high or very low river flows can affect model accuracy. 

Current Monocacy river flow is within the calibrated range of the spill model and Potomac river flow is slightly above the calibrated range.  Flows are rising.

 

Monocacy River Travel Times

Leading Edge Arrival (mil time)

Duration (hours)

Peak (hours after LE)

Peak Conc. (colif/100ml)

WWTP: Frederick

Jan 23, 0100

3

0

67639

Mouth

Jan 24, 0500

16

6

20125

 

Potomac River Travel Times

Leading Edge Arrival (mil time)

Duration (hours)

Peak (hours after LE)

Peak Conc. (colif/100ml)

Intake: Leesburg, VA

Jan 24, 1430

18

7

1,517

Intake: Fairfax Water, VA

Jan 25, 0130

19

8

1,171

Intake: WSSC, MD

Jan 25, 0930

23

9

878

Intake: Rockville, MD

Jan 25, 1130

24

9

819

Intake: WA Gt Falls

Jan 25, 1400

26

9

752

Intake: WA Lt Falls

Jan 26, 0330

32

11

505

 

 

Curtis Dalpra
 



On Tue, Jan 23, 2018 at 9:51 AM, Carlton Haywood <chaywood@...> wrote:
EXERCISE ONLY! 

A spill of approximately 787,280 liters/hr of partially treated raw sewage for 4 hours into the Monocacy River has been reported. There was a power failure, and failure of backup power as well, at the Frederick WWTP beginning at 0100 hours on Jan. 23.  Additional information with travel times to intakes will be sent in a follow-up message shortly. NOTE: Some utilities and agencies receiving this message are upstream of the spill but are included for information purposes.

Please acknowledge receipt by replying to this message.

Carlton


  
 
 




--
Curtis Dalpra
Communications Manager

ICPRB
30 W. Gude Drive, Suite 450
Rockville, MD 20850


(301) 274-8107
web: www.potomacriver.org

Like us on Facebook!

Jim Palmer <jpalmer@...>
 

message received.

On Tue, Jan 23, 2018 at 9:51 AM, Carlton Haywood <chaywood@...> wrote:
EXERCISE ONLY! 

A spill of approximately 787,280 liters/hr of partially treated raw sewage for 4 hours into the Monocacy River has been reported. There was a power failure, and failure of backup power as well, at the Frederick WWTP beginning at 0100 hours on Jan. 23.  Additional information with travel times to intakes will be sent in a follow-up message shortly. NOTE: Some utilities and agencies receiving this message are upstream of the spill but are included for information purposes.

Please acknowledge receipt by replying to this message.

Carlton


  
 
 




--
Jim Palmer
Senior Hydrogeologist
Interstate Commission on the Potomac River Basin
30 W. Gude Dr., Suite 450
Rockville, MD 20850
301.274.8104
jpalmer@...

Cherie Schultz
 

I received the message - C Schultz

On Tue, Jan 23, 2018 at 9:51 AM, Carlton Haywood <chaywood@...> wrote:
EXERCISE ONLY! 

A spill of approximately 787,280 liters/hr of partially treated raw sewage for 4 hours into the Monocacy River has been reported. There was a power failure, and failure of backup power as well, at the Frederick WWTP beginning at 0100 hours on Jan. 23.  Additional information with travel times to intakes will be sent in a follow-up message shortly. NOTE: Some utilities and agencies receiving this message are upstream of the spill but are included for information purposes.

Please acknowledge receipt by replying to this message.

Carlton


  
 
 




--
---------------------------------------------------------------------
Cherie L. Schultz, Ph.D
Director for CO-OP Operations
Interstate Commission on the Potomac River Basin
30 West Gude Drive, Suite 450, Rockville, MD 20850
telephone: 301-274-8120
e-mail: cschultz@...

Carlton Haywood
 

Please view this message in a variety of devices - cell phone, tablet, Mac vs PC - to test how well formatting works in all devices.

Curtis Dalpra
 

Received. Message was clear and easy to follow.

On Tue, Jan 23, 2018 at 9:59 AM, Cherie Schultz <cschultz@...> wrote:
I received the message - C Schultz

On Tue, Jan 23, 2018 at 9:51 AM, Carlton Haywood <chaywood@...> wrote:
EXERCISE ONLY! 

A spill of approximately 787,280 liters/hr of partially treated raw sewage for 4 hours into the Monocacy River has been reported. There was a power failure, and failure of backup power as well, at the Frederick WWTP beginning at 0100 hours on Jan. 23.  Additional information with travel times to intakes will be sent in a follow-up message shortly. NOTE: Some utilities and agencies receiving this message are upstream of the spill but are included for information purposes.

Please acknowledge receipt by replying to this message.

Carlton


  
 
 




--
---------------------------------------------------------------------
Cherie L. Schultz, Ph.D
Director for CO-OP Operations
Interstate Commission on the Potomac River Basin
30 West Gude Drive, Suite 450, Rockville, MD 20850
telephone: 301-274-8120
e-mail: cschultz@...




--
Curtis Dalpra
Communications Manager

ICPRB
30 W. Gude Drive, Suite 450
Rockville, MD 20850


(301) 274-8107
web: www.potomacriver.org

Like us on Facebook!

Cherie Schultz
 

C Schultz - I received this message. I didn't know you could paste lat and long directly into the Google Map search box - that is cool

--
---------------------------------------------------------------------
Cherie L. Schultz, Ph.D
Director for CO-OP Operations
Interstate Commission on the Potomac River Basin
30 West Gude Drive, Suite 450, Rockville, MD 20850
telephone: 301-274-8120
e-mail: cschultz@...

Carlton Haywood
 

This exercise in now over.