California Department of Resources Recycling and Recovery (CalRecycle) 

Diversion Study Guide

Preparing and Submitting a New Base-Year Request

Note: This page contains historical information from CalRecycle’s statewide goal measurement prior to 2007 that estimated a diversion percentage. For 2007 and subsequent years, CalRecycle’s compares reported disposal tons to population to calculate per capita disposal expressed in pounds/person/day. This new goal measurement system is described in CalRecycle’s Goal Measurement: 2007 and Later web page. With the implementation of this measurement system, CalRecycle will only accept new base year studies commenced prior to June 30, 2008. A jurisdiction may conduct a generation study for internal review purposes; however, CalRecycle will not review it for compliance determination.

A jurisdiction may submit a request to the CalRecycle to replace the original base year with a more current base year at any time, or it may include the request in the jurisdiction’s annual report to CalRecycle.

When using the CalRecycle Base-Year Modification Request Certification sheet to submit a request for a new base year derived from the diversion study conducted, the following documentation is required:

  • Identify data by type of generator, by material type, and diversion activity; e.g., paper (double-sided copying), food reuse, cardboard recycling.
  • Describe diversion calculation methodology used.
  • Provide a detailed summary (e.g., assumptions, methodology, sampling techniques, etc.) of the sampling methodology of the residential and non-residential sector surveyed.
  • Provide new base-year generation study calculation details.
  • For each restricted waste type, provide an explanation of how restricted waste criteria were addressed.
  • Provide list of conversion factors used, discussion of applicability, and sources.
  • Provide any documentation that will support the data collected.

The Base Year Modification Request certification sheet (Appendix L) is available on CalRecycle’s Web site.

CalRecycle's Local Assistance and Marketing Development staff is available to assist you with answering any questions you have or providing input on your new base-year study. If you need any technical assistance, please contact local assistance staff.

Table of contents

Last updated: September 3, 2009
Local Government Library
Local Assistance & Market Development: (916) 341-6199