Garbage additions, clarification, corrections
By Jeff Havens, Staff Writer
Because of the complexity of the garbage tipping story we ran last week several additions and clarifications are necessary.
Addition: Favored rates
Last week, The Rock River Times reported on the City of Rockfords current 1995-2004 garbage disposal ordinance/contract with Winnebago Reclamation, Inc. The report questioned the financing method, 6% interest, and unaddressed contingencies, to which the city agreed in 1995.
One unaddressed contingency was a process to verify that the city receives the Favored Rate, which is mandated in the ordinance/contract. In other words, no one dumps and is charged, at a rate that is less than what the city receivesthe city gets the lowest rate. Further investigation suggests that the city is not getting the Favored Rate.
Currently, the city pays $52.33 per ton to dump its trash into Pagel Pit. Pagel Pit is owned by William Charles, Ltd, which also owns Winnebago Reclamation. Dean Falkner, the Rock River Water
Reclamation District director, confirmed that the district has dumped its “sludge” into Pagel Pit for $23.50 per ton, for years.
However, Falkner says by the end of this year the district will no longer be dumping sludge into Pagel Pit.
The question of whether the districts disposal rate should also apply to the citys disposal rate, is one of understanding the relationship the districts sludge has to the citys trash.
Sludge consists of about 25% solid wastes and 75% liquid wastes that are derived from raw sewage. Falkner says that most of the liquids in the sludge are contained within bacterial cells.
The district has its sludge transported to Pagel Pit, where it is dumped. This is the same dumping site for Rockfords trash, which primarily consists of paper.
Sources say the liquid in the districts sludge is absorbed by the citys paper waste. The absorption of the liquid helps prevent disease-causing organisms from filtering through to the ground water via bacterial activity.
In addition, the absorption also
aids in preventing liquids from pooling on the surface of the landfill. Prevention of pooled liquids on the surface of the landfill is necessary because of its potential to provide breeding and feeding grounds for
According to sources, the districts sludge needs the citys paper waste to absorb liquids. Therefore, the citys $52.33 per ton should drop to the same rate as
the districts $23.50 per ton.
Simple vs. Compound growth
Last weeks article used the terms simple interest formula and compound interest formula. Later, the terms were shortened to simple interest and compound interest. More appropriate synonyms would have been simple growth and compound growth.
Questions were also raised as to how to compute simple and compound growth:
The simple growth formula is given by:
i = prt.
Where i is the growth by an amount p at an annual rate r for t years.
e.g., What is the rate, in dollars per ton, Rockford will pay in 2004 if the initial rate in
1995 is $34.80 per ton, computed at 3.37% simple growth?
i = rate change, p = $34.80 per ton, r = (3.37%/100%) = 0.0337, t = 9 years (age of contract) Step 1) Use the simple growth formula to compute the rate change. i = 34.80 x 0.0337 x 9 = 10.55484
Step 2) Add the rate change to the 1995 rate. 10.55484 + 34.80 = 45.35484 = $45.35 per ton in 2004. This is the rate in the report.
The compound growth formula is given by:
A = P(1 + r/k)kt
Where P is the initial amount at an annual rate r, compounded k times per year, the amount A after t years.
e.g., What is the rate, in dollars per ton, Rockford will pay in 2004 if the initial rate in 1995 is $34.80 per ton, computed at 6% compound growth?
A = rate in 2004, P = $34.80 per ton, r = (6%/100%) = 0.06, k = 1, t = 9 years (age of contract). Note that age of the contract for calculation purposes is 0 years in 1995 (see table on bottom of page 11, in the Oct. 9th issue). A = 34.80 x (1 + 0.06/1) 1 x 9
A = 34.80 x (1 + 0.06)9
A = 34.80 x 1.689479
A = 58.793868 = $58.79 per ton. This is the rate in the report and described in the ordinance/contract for 2004.
1. The first paragraph on page 12 should read, This figure does not include the fees that could be charged for cover at the landfill. Last weeks issue read, This figure does include.
2. Under the Janesville landfill subheading the seventh paragraph should have read, This year Alderman Beach estimates that, at most, it would cost the city about $30 per ton to transfer and dump Rockfords trash into Janesvilles landfill. The word collect was incorrect in the sentence.
3. A source indicates that the company Woodcycle has changed its name to Rockford Composting.