NIDs Combie Reservoir Sediment and Mercury Removal Project
Posted in the Grass Valley Forum
#1 Feb 4, 2013
Subject: NIDs Combie Reservoir Sediment and Mercury Removal Project
87% to 93% Mercury recovered. 7-9 Million taxpayers money
Antidegradation Study (8/12)
The purpose of the Combie Reservoir Sediment and Mercury Removal Project (the Project) is to:
a. Remove sediment that has accumulated in Combie Reservoir since 2003;
b. Remove free elemental mercury using an innovative recovery process from settled and
suspended sediment recovered during the dredging operations; and
Taken from page 64 of their report.
Test 1 was conducted with the drying bed material/Chevreaux waste product, which was mostly silt and clay (86% fines). Test 2 was conducted with the project material (mostly sand, 4% fines) that was collected from the river delta in the area to be dredged. The table below indicates the calculated percent removal of mercury for each test, as well as the estimated head mercury content.
See Table 4. The percent mercury removed by Pegasus Mercury Extraction Equipment for each test.
In conclusion the mercury extraction equipment removed approximately 93% of the free elemental mercury in the material that was size fraction > 0.063 mm, sand size.
Approximately 87.223% using test 1, 2, and 4.
WHAT HAPPENED TO TEST 3 AND 4 ???
The project will take 3 to 5 years, operating up to nine months per year generally from March to November, each year - weather permitting. The project will remove and treat an estimated 200,000 cubic yards of sediment
As to their statement from page 5 of their report.
Taken from page 64 of their report.
Test 1 was conducted with the drying bed material/Chevreaux waste product, which was mostly silt and clay (86% fines). Test 2 was conducted with the project material (mostly sand, 4% fines) that was collected from the river delta in the area to be dredged.
Test 1, Silt and clay…
According to the CRC Handbook of Chemistry and Physics (60th Edition), a cubic foot of clay weighs 112 to 162 pounds. A cubic yard would weigh 27 times as much.
3024 to 4374 pounds of clay per cubic yard. Avg, 3699 pounds of clay per cubic yard.
Test 2, Mostly sand…
Dry sand weighs 100 pounds per cubic foot; there are 27 cubic feet in a cubic yard so 2,700 pounds. Wet sand has different weight.
A cubic foot of dry, loose gravel with 1/4" to 2" stones is 105 pounds per cubic foot. So, a cubic yard is that times 27, or 2835 lb.(There are 27 cubic feet in a cubic yard.)
Test 1, Silt and clay…avg, 3699lbs per cubic yd x 200,000 cubic yds = 739,800,000lbs
Test 2, Mostly sand…Dry 2700lbs per cubic yd x 200,000 cubic yds = 540,000,000lbs
Gravel,dry, loose -Ľ”- 2” 2835lbs per cubic yd x 200,000 cubic yds = 567,000,000lbs
Lets use test 2 just for the heck of it…
Test 2, Mostly sand…Dry 2700lbs per cubic yd x 200,000 cubic yds = 540,000,000lbs.
Test Date Time, min Water used (lbs) Material processed (kg) Mercury recovered (g)
2 10/1/2009 20 5180 288 0.3154
20mins to process 288 (kg) of material. 288 (kg)= 634.93lbs.
3 x 20mins = 60mins = 1hr. 3 x 634.93lbs = 1904.79lbs per hr. Material processed.
540,000,000lbs of material to process at 1904.79lbs per hr = 283,495.82 hours.
283,495.82 hours at 24 hours per day = 11,812.33 days.
11,812.33 days at 365 days per yr = 32.36 yrs
Mercury recovered (g)
20mins to recover 0.3154(g) of mercury. 0.3154 (g) of mercury = 0.00069534lbs.
3 x 20mins = 60mins = 1 hr. 3 x 0.00069534lbs = 0.00208602lbs of mercury per hr.
50lbs of mercury at 0.00208602lbs per hr = 23,969.09hrs.
23,969.09hrs at 24hrs per day = 998.71 days.
998.71 days at 365 days per yr = 2.74 yrs.
And you gave them the permits to do this!
cc: Tom McClintock Subcomittee Chair
#2 Feb 4, 2013
Sucking all material, and trucking it to another site to be cleaned of mercury and gold, and sorted (sand & gravel) then sold, would be the best way to do it. And I bet there would be companys out there willing to bid on doing that. But NO way! They want that taxpayers money and make it look like they are doing something good for the water.
SMOKE and MIRRORS!
Since they're using a cutterhead dredge, only capable of handling silt and mud,(blades will be damaged by larger sand and gravel), the only
material delivered to the extraction equip.(Pegasus knelson bowl), is too small in particle size to be decontaminated of merc. The knelson bowl is no better
at capturing small particles of merc. than suction dredges miners were using, which was used against us by the Sierra Fund ("remobilizing" merc., they said)
There will be no "decontaminated material" - the piles of muck and silt will still have merc. in them.
Hey, since you live in the area, does anybody from meadow vista or colfax know or care about this waste of tax dollars?
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