Jul 11, 2008

Traffic - Number of Trucks Daily

SUMMARY:
1. HuHonua is under-estimating the traffic they will generate.
2. The resulting truck weight on our bridges poses a dangerous situation.


At the 7-9-08 Pepeekeo community meeting, HuHonua stated that 225,000 bbl of oil will be replaced annually with their operation (this is a 24 MW plant). They say that 1 bbl oil equals 1 ton of biomass. They will bring trucks 5 days/week, 260 workddays per year. So in order to save 865 bbl oil per day, they must burn 865 tons of biomass per day (225,000 tons divided by 260 workdays).

They say 2-3 trucks per HOUR will be needed to haul this biomass to meet their target, that's 16-24 trucks per day. So, in order to save 865 bbl oil per day, 16-24 trucks need to carry 865 tons of biomass per day. Then each truck needs to haul 36-54 tons of biomass on each trip.

The federal highway weight limits the overall gross weight of a loaded tandem axle truck trailer to 34 tons on bridges. So, the number of trucks must be 3 or more per hour and not less than 3 per hour, otherwise the federal highway weight limit will be exceeded.

However, the county of Hawaii says our bridges either "accommodate regulation size vehicles included most truck-trailers" or "accommodates all regulation size vehicles up to 6 tons". HuHonua has provided any certification that their trucks will follow the legal limits.


Hawaii County Bridges, part 1
County Bridges, part 2


Federal Bridge Weight Limits

federal truck weights on highways and bridges

national bridge database

5 comments:

Anonymous said...

Have they mentioned anything about road improvements? If there are really 3 trucks an hour, Sugar Mill road will be in worse shape than it already is. Are there any statues about if they improve the road they will need to bring it up to "code"?

Susan Munro said...

Sugar Mill Road is a private road, maintained by the area property owners. Hu Honua has a legal right to use the road, and a legal obligation to help maintain it. IF we wanted to turn the road over to the county, we would have to bring it up to code.

Elaine said...

Steve Meek says that cane trucks handle 45-60 tons each and are currently used in the Maui plant. So no impact on this issue.

Anonymous said...

Steve Meek says that cane trucks handle 45-60 tons each and are currently used in the Maui plant. So no impact on this issue.

Anonymous said...

With all regards to Steve, I have trouble believing that trucks can carry 90,000 to 120,000 pounds at a time. Those #'s are in line with heavy load railroad cars (like lumber, gravel etc) but not trucks. I put a call into my friend who owns a major trucking company in West Hawaii. 15 tons for a double axle dump truck and 30 tons for a trailered truck is the max. He said that they only carry 30 tons if the slope is not too steep. The only product that will fit in the trucks and approach those weights are base coarse, which is very dense. I have no info on the weight of wood chips but they have to be lighter than rock, even if they are very wet. Last I checked, rocks sink in water, thus, per volume they are heavier/denser. Additionally, on the subject of barrels of oil saved, according to Hu Honus stats: (225k barrels saved and 225k tons of chips used annually)That means 1 ton of chips equals the same stored energy as a barrel of oil. This seems suspect to me. It seems more reasonable that they will offset 80k-90k barrels based on the Maui plants specs on barrels of oils saved per megawatt. The next step is to find out how much cubic volume 1 ton of wood chips is. Aloha


Upcoming Meetings

  • HuHonua, 8/13/08
  • Jay Ignacio, Helco 8/14/08
  • Tues 8/5/08 7pm Susan's
  • Mayor Kim Thurs 7/31/2008 1:30 pm
  • Wed 7/16/08 7pm Susan's

About Me

Local environmental activist.