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Introduction
Without the adjustment method, population increases and economic booms would result in
jurisdictions with lower diversion rate estimates. The adjustment method uses
base-year generation tons and
three factors to estimate report-year generation tons: percentage change in population, employment, and taxable sales
adjusted for inflation.
- "Base-year generation" means the amount of waste generated
by a jurisdiction during the calendar year used for a jurisdiction's solid waste generation study. The
waste generated by a jurisdiction includes all solid waste disposed or
diverted. Base-year generation is the basis for subsequent year Board
estimates of jurisdiction generation tons and diversion rates.
- "Default values" means standard measurements of population and economic growth for
cities, counties, and regions calculated by state and federal agencies and incorporated by the
Board into its diversion rate calculator.
- "Residential percentage" means that portion of a jurisdiction waste
stream created by single- and multi-family residences.
Using the Adjustment Method to Estimate a Diversion Rate
- Jurisdictions must estimate
their base-year residential waste generation percentage because population
and
economic growth affect residential
and non-residential waste generation differently.
- Most jurisdictions use county-level or jurisdiction-specific default
factor values
supplied by the Board. Others may use factor values from independent third
parties with case-by-case Board approval. The same source must be used for both the base year
factor and the report year factor.
- The Board’s online diversion rate calculator
incorporates base-year generation tons, base-year residential generation
percentage, adjustment factors, and report-year disposal tons into the diversion rate estimate.
This diversion rate
calculator is part of the electronic annual report that a
jurisdiction my use to file its annual report to the Board.
- The adjustment method does not correct for inaccurate base-year generation
or report-year
disposal
amounts.
Proposed corrections should be discussed in a jurisdiction's annual report
to the Board.
- If a jurisdiction thinks changes in its waste stream were not accurately reflected by
changes in population, employment
or inflation-adjusted
taxable sales, it may discuss its reasons in its annual report to the
Board. A
jurisdiction may also contact the Board's
local assistance staff or the Local
Assistance-Los Angeles Section for further assistance.
Legislation, Statutes, and Regulations
Enacting Legislation:
Chapter 1292, Statutes of 1992 (Sher, AB 2494), amended by Chapter 978,
Statutes of 1996 (Bustamante, AB 1647)
Statute: Public Resources Code (PRC) Section
PRC 41780.1,
Waste Diversion Planning Requirements
Regulations:
Title 14, California Code of Regulations (14 CCR), Chapter 9, Article
9.1, Adjustment Method for Calculating Changes in Waste
Generation Tonnage
Additional Resources
- Adjustment Method Factors:
Detailed descriptions of the population and economic factors used in the Board-approved
adjustment method and the adjustment method formula.
- Default Adjustment Factors:
Search this CIWMB on-line database to find default adjustment factors for
all California jurisdictions.
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