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19.1 Additional Data Collection from Other Existing Sources
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A total of 1173 additional solid waste records of U.S. businesses and government agencies were gathered from existing sources other than the research survey data. The waste records are de ned as annual solid waste tonnage and compositions as well as the independent variables required for the environmental model. These sources were not collected from the national survey used for this research, but from waste management of ces around the United States. The data sources were U.S. government (14 sources) and universities solid waste assessment programs (6 sources). An overview of the additional data
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TABLE 19.1
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ADDITIONAL DATA COLLECTED FOR VALIDATION WASTE RECORDS PROVIDED
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ADDITIONAL DATA SOURCE
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Arkansas Department of Pollution Control and Ecology Bradley University Industrial Assessment Center Carroll-Columbiana-Harrison Counties Cornell Waste Management Institute (CWMI) Darke-Marion County Solid Waste District Erie County Solid Waste District Fayette-Highland-Pickaway-Ross Counties Solid Waste District Florida Department of Environmental Protection Geauga-Trumbull Solid Waste District Green County Solid Waste District Hancock County Solid Waste District Indiana Institute on Recycling Mahoning County Solid Waste District Montgomery County Solid Waste District New Hampshire Department of Environmental Service The University of Toledo Waste Analyses and Minimization Research Project Warren County Solid Waste District West Virginia University Industrial Assessment Center Wisconsin Department of Natural Resources Youngstown State University Waste Minimization Research Project
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Arkansas Peoria, IL Carrollton, Ohio Cornell University Marion, Ohio Sandusky, Ohio Chillicothe, Ohio Tallahassee, Florida Warren, Ohio Xenia, Ohio Findley, Ohio Indiana State University Youngstown, Ohio Dayton, Ohio New Hampshire Toledo, Ohio
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134 8 14 20 16 36 123 15 141 183 70 43 58 19 86 24
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Lebanon, Ohio Morgantown, WV Madison, Wisconsin Youngstown, Ohio TOTAL
102 10 39 32 1,173
VALIDATION OF THE DEVELOPED ENVIRONMENTAL MODEL
collected is displayed in Table 19.1. The table displays the sources, location, and number of waste records collected. These data sources were identi ed from previous research conducted (Franchetti, 1999), professional waste management contacts, information gathered during the literature review, and Internet searches. Much raw data existed on waste generation levels of individual companies, but little company information that quanti ed waste generation rates. Many state and local environmental agencies collected waste generation data to use for various aggregate reports. These reports examined waste generation for entire geographical regions, not individual companies. The individual data was stored in les and rarely used for other purposes. This research consolidated some of this data to validate the developed model. The accuracy of this data is considered high because it was collected by the U.S. government at the state and local levels. Different methodologies and survey techniques were utilized to collect the existing data, and may contribute to variation.
19.2 Validation of the Developed Environmental Model
To demonstrate the validation process for the developed environmental model, the waste records were gathered from one existing data source (Greene County, Ohio). Greene County data was used due to its high accuracy and reliability. From these waste records, regression equations were computed for the waste groups with ve or more records (this included 16 of the 20 waste groups). Hypothesis tests were conducted to determine if the regression coef cients from the existing data were equal to the developed model s coef cients at the 95 percent con dence level. Table 19.2 displays the results for the 16 waste groups developed from Greene County data.
TABLE 19.2 MODEL VALIDATION TESTS (HYPOTHESIS TESTS* TO EXAMINE IF SIGNIFICANT DIFFERENCES EXIST BETWEEN THE MODELS DEVELOPED FROM SURVEY DATA VERSUS ADDITIONAL DATA COLLECTED )
DEVELOPED MODEL COEFFICIENT USING ADDITIONAL DATA
WASTE GROUP
SIGNIFICANT VARIABLE
DEVELOPED MODEL COEFFICIENT USING SURVEY DATA
T VALUE
CRITICAL VALUE
P VALUE
AUT CHM
Employees Employees Disposal cost ISO 14001
0.51 7.14 3.49 140.40 0.43
0.62 7.10 3.75 132.43 0.40
0.880 0.190 0.880 0.990 0.180
2.262 3.182 3.182 3.182 2.052
0.408 0.861 0.444 0.395 0.858 (Continued )
Employees
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TABLE 19.2 MODEL VALIDATION TESTS (HYPOTHESIS TESTS* TO EXAMINE IF SIGNIFICANT DIFFERENCES EXIST BETWEEN THE MODELS DEVELOPED FROM SURVEY DATA VERSUS ADDITIONAL DATA COLLECTED ) (CONTINUED)
DEVELOPED MODEL COEFFICIENT USING ADDITIONAL DATA
WASTE GROUP
SIGNIFICANT VARIABLE
DEVELOPED MODEL COEFFICIENT USING SURVEY DATA
T VALUE
CRITICAL VALUE
P VALUE
EDU ELM
Employees Employees Disposal cost ISO 14001
0.25 2.29 0.83 53.31 1.29 7.19 5.17 183.50 2.71 2.01 0.98 8.43 7.51 214.90 1.87 5.91 0.78 2.97 1.73 56.22 17.40 7.76 217.59
0.28 2.58 0.78 55.25 1.38 7.48 5.08 173.81 2.58 2.18 0.94 8.54 7.21 211.05 1.73 6.05 0.84 2.81 1.64 58.92 15.81 7.51 207.73
0.270 0.948 0.121 0.136 1.020 0.830 0.410 0.730 0.840 0.980 1.070 0.270 0.460 0.730 0.380 0.810 0.180 0.640 0.510 0.430 0.790 0.810 1.080
2.776 2.110 2.110 2.110 2.179 2.228 2.228 2.228 2.306 2.447 2.365 2.776 2.776 2.776 2.447 2.306 2.12 3.182 3.182 3.182 2.776 2.776 2.773
0.801 0.349 0.904 0.892 0.326 0.426 0.691 0.482 0.425 0.365 0.32 0.801 0.669 0.506 0.717 0.441 0.859 0.568 0.645 0.696 0.474 0.463 0.341
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