CE 527 Solid Waste Management
Project – Fall 2003
Due date: Nov. 18, 2003
Dr. S.K. Ong.
MetroWaste East would like to maximize use of available airspace at their landfill. One approach is to use
the airspace above an existing landfill. The area of expansion is roughly shown on the enclosed map (handed out at
landfill visit). To minimize initial capital costs, the area will be landfilled in various phases (called cells here).
Municipal solid waste generated by the city from 1996 - 2001 is provided in the Table below. Waste generated in
the future can be estimated from waste generated over this period. Your task is to develop a conceptual and
engineering plan for the new landfill. Your design should conform to the Iowa State Code for design and
construction of landfills (see notes handed out in class). You are also required to conduct a cost benefit analysis.
Conceptual design should include the following:
(i)
An engineering plan showing the number of cells you will use to develop the area for the landfill.
Information needed are (i) number of cells (phases) needed, (ii) volume of each cell, (iii) total volume of
developed landfill, (iv) life of the landfill.
Include the following two options: (a) with excavation of the existing landfill cover, assume 2 feet deep
(b) without excavation of the existing landfill cover
Include in your plan (a short description) on how and where you would place the excavated dirt. Assume
that dirt excavated will be used for the new landfill. Dirt will be used as daily cover and final cover.
(ii)
Provide sketches to show the cells, dimensions of cells and cuts to be made, make sure you include liners
and drainage system and final cover. Liner system should follow the Iowa State requirements. You may
want to provide cross-sectional views, etc. Also estimate the amount of dirt to be removed for each cell
and total amount of dirt to be removed. Provide the elevations for each cell. Note that the maximum
height allowed after capping is 990 ft.
(iii)
Develop a plan on how you will collect the leachate for each cell (phase) and how you will tie the new
leachate collection system, if needed, with existing leachate collection lines and manholes as shown in the
given map. Please provide elevations of critical points in your leachate collection system (your design will
be evaluated based on proper selection of elevations).
(iv)
Conduct a cost benefit analysis for this approach. Cost data are provided below. Neglect any interest rates,
etc. For your cost analysis include the following two options:
(a) with excavation of the existing landfill cover, assume 2 feet deep
(b) without excavation of the existing landfill cover
To ensure uniformity in estimations. Use the following:
The ratio of waste to daily cover in the landfill is 5:1.
Density of compacted waste is 1,250 lb/yd3
Capital Cost: Expenses:
(a) Excavation of existing cover (include transport and dumping on site)
(b) Cost to landfill (workers, daily cover, depreciation of equipment, oversight, etc)
(c) Cost for final cover (includes liner, drainage, pipes, etc)
(d) Cost for liner system (FML, clay liner)
Site Preparation and Earth Work
Liner System (clay liner, FML, Leachate Collection)
Revenues
Tipping fees: $25 gross per ton of waste received.
= $5/yd3.
= $15/ton
= $82,000/acre
= $20,000/acre
=$160,000/acre
Date of Initial Survey
Date of Final Survey
Tonnage tons
1/25/01
6/14/01
153,606
6/28/00
1/24/01
235,380
11/19/99
6/27/00
247,668
6/19/99
11/18/99
184,990
3/6/99
6/18/99
106,049
12/3/98
3/5/99
79,270
9/2/98
12/2/98
99,882
Date of Initial Survey
Date of Final Survey
Tonnage tons
6/19/98
9/1/98
83,737
3/4/98
6/18/98
106,228
11/26/97
3/3/98
78,949
9/4/97
11/25/97
75,201
6/3/97
9/3/97
90,974
3/16/97
6/2/97
73,204
11/19/96
3/15/97
97,270
Please provide your final estimate as shown below. This summary page should be attached as the first page of your
report. Other information provided: Flood plains and Quarterly water levels.
SUMMARY SHEET
(i)
Number of Cells
Dimensions of
Cell
Volume of
Dirt
excavated
(yd3)
= __________
Option 1
Volume of
Cell for
land
filling
(yd3)
Life of cell
(include
daily cover)
(years)
Volume of
Dirt
excavated
(yd3)
Option 2
Volume of
Cell for
land filling
(yd3)
Life of cell
(include
daily cover)
(years)
CELL 1
CELL 2
CELL 3
TOTAL
(ii)
Leachate Collection (identify Cell __________)
(a) Cell:__________
Total Length of pipe needed for leachate collection (ft)
Collection sump needed (if any)
= ___________________
Pumps needed, (if any)
=____________________
(b) Cell:__________
Total Length of pipe needed for leachate collection (ft)
(iii)
(iv)
= ___________________
= ___________________
Collection sump needed, (if any)
= ___________________
Pumps needed, (if any)
=____________________
Overall Cost Benefit Analysis (assume with excavation of existing landfill cover)
Total Costs to Develop Landfill
Item (i): __________________________________
Item (ii): __________________________________
Item (iii): _________________________________
Item (iv): _________________________________
=___________
=___________
=___________
= ___________
Revenues: _____________________
= ___________
Profit/Loss:
= ___________
Comparison of Options (with excavation and without excavation)
With Excavation
Capital Costs
Revenues
Profit/Losses
Without Excavation