From: Rick Baker 

To: Elizabeth Sabol 

CC: Deborah Bartram; Rick Baker 

Date: 9/14/2011 2:36 PM 

Subject: Re: Fuel/Emission Factors for Dump Trucks 

Attachments: DumpTrk_tb1.xls; DmpTrk.in 

Hi Liz: 

 

Here you go. Note that since dump trucks are registered for on-road use, we use MOBILE instead of NONROAD for the emission 

factors, regardless of where/how the trucks are used. 

 

1) MOBILE doesn't estimate fuel consumption at idle, but as per EPA guidance, idle performance is approximated by assuming 2.5 

mph operation. A Class 8a diesel truck (includes dump trucks) operating at 2.5 mph gets 6.6 mpg, according to MOBILE6.2. 

Dividing gives 0.38 gal/hr, which you can use for your idle fuel consumption estimate. 

 

2) Emission factors for CH4 and N2O for heavy-duty diesel trucks are 0.06 g/mi and 0.05 g/mi, respectively. MOBILE doesn't 

provide these, so I took them from the California Climate Action Registry, General Reporting Protocol, v2.2, March 2007, Table C4 

(for 1996 and newer diesel trucks). 

 

3) Emission factors from MOBILE6.2 are as follows:

 

NOx = 0.614 g/mi (highway); 05.92 g/mi (local/offroad) 

 

CO2 = 1542.4 g/mi (both) 

 

SO2 = 0.0144 g.mi (both). 

 

Key MOBILE6.2 input assumptions include 2010 calendar year, 2010 model year, and ultra-low sulfur diesel fuel used. I've 

attached the MOBILE6 input and output files for your reference. 

 

Just let me know if you need anything else. 

 

Rick 

 

 

 

Rick Baker 

Senior Scientist 

Eastern Research Group, Inc. 

3508 Far West Blvd #210 

Austin, TX 78731 

ph: (512) 407-1823 

fax:(512) 419-0089 

rick.baker@erg.com>>> Elizabeth Sabol 9/12/2011 1:01 PM >>> 

We are looking to have factors for both highways (off-site landfills, MOBILE6 model) and off-road (on-site landfills, NONROAD 2005) 

by Thursday or Friday of this week. 

 

Please let me know if you need any other information. 

Thanks, 

Liz 

 

Elizabeth A. Sabol 

Environmental Engineer 

Eastern Research Group, Inc. 

14555 Avion Parkway, Suite 200 

Chantilly, VA 20151 

elizabeth.sabol@erg.com 

Phone:703-633-1659 

>>> Rick Baker 9/12/2011 1:43 PM >>> 

those are all available from MOBILE, but N2O and CH4 aren't in NONROAD outputs (I don't think - I'll double-check). Regardless, 

CH4 should be VERY low for diesel trucks. 

 

We could probably do this in two hours or less. When do you need it? 
 

Rick 

 

Rick Baker 

Senior Scientist 

Eastern Research Group, Inc. 

3508 Far West Blvd #210 

Austin, TX 78731 

ph: (512) 407-1823 

fax:(512) 419-0089 

rick.baker@erg.com>>> Elizabeth Sabol 9/12/2011 11:59 AM >>> 

Rick, 

 

We are looking to evaluate criteria and green house gas emissions. The pollutants we've selected are: NOx, SO2, CO2, N2O, and 

CH4. However, if you are aware of any others you think we should be looking at, please let us know! 

 

Thanks, 

Liz 

>>> Rick Baker 9/12/2011 12:42 PM >>> 

ok, that's a pretty clean engine. 

 

we can pull some info together for you pretty easily. What pollutants are you interested in? 

 

 

 

Rick Baker 

Senior Scientist 

Eastern Research Group, Inc. 

3508 Far West Blvd #210 

Austin, TX 78731 

ph: (512) 407-1823 

fax:(512) 419-0089 

rick.baker@erg.com>>> Elizabeth Sabol 9/12/2011 11:40 AM >>> 

Rick, 

 

The year we are using for the model is 2010. 

 

Thanks, 

Liz 

>>> Rick Baker 9/12/2011 12:15 PM >>> 

Hi Elizabeth. 

 

Do you happen to know the model year of the dump truck? That makes a big difference in emission rates. 

 

Rick 

 

 

Rick Baker 

Senior Scientist 

Eastern Research Group, Inc. 

3508 Far West Blvd #210 

Austin, TX 78731 

ph: (512) 407-1823 

fax:(512) 419-0089 

rick.baker@erg.com>>> Elizabeth Sabol 9/12/2011 10:44 AM >>> 

Rick, 

 

We are currently working on ways to estimate fuel consumption and emissions related to the transportation of sludge and/or ash 

from steam electric power plants. Our model evaluates a diesel dump truck that transports ash or sludge to an off-site or on-site 

landfill. 
 

We have a fuel consumption (gallon/mile) for the dump truck; however, we are looking for the fuel consumption of a dump truck 

at idle. Are you aware of a quick estimate/rule of thumb for determining the idling fuel consumption? Or do you know where I could 

search to find this value? 

 

We are also looking to evaluate air emissions for the dump truck based on the MOBILE6 and NONROAD 2005 models. As of now, 

we are estimating that we would use the MOBILE6 model to estimate emissions for dump trucks that transport wastes to an off-site 

landfill (20 miles away) and the NONROAD model to estimate emissions for dump trucks that transport wastes to an on-site landfill 

(1.3 miles away). Are you aware of any universal factors/inputs that we could use to get a typical emission factor from the 

MOBILE6 model for a dump truck transporting solids wastes via highway? In addition, a similar approach to get a typical emission 

factor for a dump truck in the NONROAD model? 

 

Thank you for your time in advance. I appreciate any information you may have on the topics above. If you need a charge number, 

please use the following: 07012.08.029.044. Also, if you could please let me know the number of hours you'll need for tracking 

purposes. 

 

Thanks, 

Elizabeth 

 

 

Elizabeth A. Sabol 

Environmental Engineer 

Eastern Research Group, Inc. 

14555 Avion Parkway, Suite 200 

Chantilly, VA 20151 

elizabeth.sabol@erg.com 

Phone:703-633-1659