Originally Posted by
Recc
Surely you can see that your statement is a non sequitur. Soil lead levels can be elevated (when compared to prior levels or surrounding land) without being over a threshold level. In addition, atmospheric lead is a distinct issue from soil lead and one that is much more relevant to BLL (which is the subject of the paper). There is a decent literature on the relationship of BLL to proximity to airports and some studies that show relationships with atmospheric and soil lead too.
Some examples:
…
Nobody is suggesting that there will be children suffering from acute lead poisoning as a result of this level of exposure, but it is at a level where minor cognitive and developmental effects might be possible for the highest level of exposure. They are decent quality studies and certainly relevant to regulators and policy decisions.
Hmmm… I’ve seen yer quoted research in other forums. It were fairly easy to debunk research that is more interested in ‘race’ then actual science..
..though, lets not get too far ahead.
“...The study, conducted by Dallas-based Jacobs Engineering, took 32 soil samples around Reid-Hillview Airport. None of the samples returned lead levels exceeding the danger determined by San Francisco Bay Regional Water Quality Board, the state of California or Environmental Protection Agency, the study read…”
Seems fairly straight forward to me. The average soil lead levels around the airport are on a par with soil lead levels found elsewhere. After all those years of intensive aviation usage the surrounding land has minimal lead readings - go figure..
For one thing, considering there are still lots of leaded water pipes still in use in the USA you will get a ‘man made’ lead level readings most places in the US. There is also the legal disclaimer re lead that renters sign before they can rent older homes.
(Note, I am unable to post links. I will go back over my posts and add links later)
Originally Posted by
scifi
I did a course at University of East Anglia, which studied Environmental Control and Public Health. This was many years ago when we still had 4 star petrol. Our tutor said that the lead from car exhausts would quickly fall onto the ground and be washed down the drains at the next rainfall. He said that unless you dropped your sandwiches on the tarmac, you would not ingest these lead particles.
Just for perspective, 100LL contains 2 grams of TetraEthyl Lead (TEL.) per gallon of fuel. When this is burnt it produces Water, Carbon Monoxide and some Lead.
I still miss the 5 star, having had some motorcycles that needed it. Also this 5% / 10% Ethanol fuel has wrecked 4 of my Fibreglass motorcycle fuel tanks, which now need to be replaced with Alloy or Steel Tanks.
Hmmm… From reading the research I’m a bit sceptical of the “quickly fall” claim. More likely end up ‘blowing in the wind’ for a time, mixing in with all that other human and naturally sourced airborne lead.