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Oceano Dunes Particulate Emissions Reduction Efforts

June 11, 2019 Update

As part of the ongoing implementation of the Stipulated Order of Abatement Number 17-01, State Parks has submitted an updated Particulate Matter Reduction Plan in June 2019. This plan is not a “project” as defined by CEQA, however a process that will outline an approach to development of the annual Workplan, which is due on August 1, 2019. A public workshop for the workplan will be held in Fall 2019 to allow the public an opportunity to review the workplan and provide comments.

The SLO County APCD has issued an approval of the June 10, 2019 Particulate Reduction Plan to State Parks. The approval is subject to the multiple qualifications and conditions as set forth in the Draft Particulate Matter Reduction Plan (DPMRP), and should not be considered as an approve of "definite course of action" as defined by the California Environmental Quality Act (CEQA) Guideline 15352.

Although the PMRP is identified as an initial, conceptual, and preliminary plan, it is approved as is defines what a proposed project should and could include. 

Upcoming Milestone Dates: 

June 30, 2019: Temporary track-out devices to be installed on Grand & Pier Avenue entrances.
July 2019 - November 2019: State Park's project environmental review process 
August 1, 2019: Draft 2019 Annual Work Plan due from State Parks
September / October 2019: Public Workshop to be held on the 2019 Annual Workplan
October / November 2019: 2019 Annual Plan approval
Winder 2019/2020: mitigation installation of projects in the 2019 Annual Workplan

Important Documents:

June 10, 2019 APCD Letter to State Parks

Particulate Matter Reduction Plan - June 2019

Particulate Matter Reduction Plan Attachments

Scientific Advisory Group Response to the Revised Plan

Most Frequently Asked Questions

Responses to Comments Received on the May 1, 2019 Workshop Version of the DPMRP


May 2, 2019 Update

On May 1, 2019, SLO County APCD, State Parks and the Scientific Advisory Group conducted a public workshop at the South County Regional Center to present the Oceano Dunes Draft Particulate Matter Reduction Plan. Below are links to the presentations that were presented at that workshop, as well as all of the comments received in person at the workshop. Also below is a link to the public comments received via This document will be updated regularly to reflect new comments received up until the May 15, 2019 closing date. 

SLO County APCD Presentation

California State Parks Presentation

Scientific Advisory Group Presentation 

Public Comments Received at the May 1 Workshop

Public Comments Received via Email as of May 1

Public Comments Received via Email between May 2 and May 20


April 1, 2019 Update

Stipulated Order of Abatement Number 17-01 California Department of Parks and Recreation

In response to the Stipulated Order of Abatement (SOA) #17-01 with the SLO County APCD, California Department of Parks and Recreation (State Parks) submitted the Revised Oceano Dunes SVRA Concept Draft Particulate Matter Reduction Plan (DPMRP) on March 28, 2019, which was updated based on comments from SLO County APCD and the Scientific Advisory Group’s (SAG) preliminary review of the initial February draft plan.

April 1, 2019 APCD Response to State Parks March 28 DPMRP

Revised Preliminary Concept PMRP Memo

March 28, 2019 Version Oceano Dunes SVRA Preliminary Concept Draft Particulate Matter Reduction Plan (DPMRP)

DPMRP Attachments 1 through 9


February 25, 2019 Update

Stipulated Order of Abatement Number 17-01 California Department of Parks and Recreation

In response to the Stipulated Order of Abatement Number 17-01 (SOA #17-01) condition 2.g, California Department of Parks and Recreation (State Parks) has submitted the Oceano Dunes SVRA Concept Draft Particulate Matter Reduction Plan (DPMRP) on February 1, 2019 and a revised DPMRP on February 21, 2019.

The SLO County APCD’s preliminary review letter was prepared without the benefit of reviewing the comments of the appointed Scientific Advisory Group (SAG) and further SLO County APCD comments will be forthcoming after review of those comments with State Parks and the SAG itself.

In order to give the public an adequate chance to review a more refined PMRP that meets requirements of the SOA #17-01, before the public workshop required by SOA#17-01, the changes requested by the SAG and the SLO County APCD will be addressed by March 22, 2019.  The SLO County APCD intends to post and circulate a revised draft PMRP at least 30 days prior to the public workshop. The workshop is scheduled for May 1, 2019 at 6:00pm at the South County Regional Center, 800 West Branch Street in Arroyo Grande.

Stipulated Order of Abatement Number 17-01 (SOA #17-01)

February 21, 2019 Version Oceano Dunes SVRA Concept Draft Particulate Matter Reduction Plan (DPMRP)

DPMRP Attachments 1 through 8

February 1, 2019 Cover Letter

SLO County APCD’s Preliminary Review Letter

Scientific Advisory Committee Gantt Charts

Scientific Advisory Committee Comment Letter


Over the past 10 years, both the Air Pollution Control District and the OHV Division of State Parks have performed numerous scientific studies to determine the nature, cause and extent of the high particulate matter (PM) concentrations impacting air quality and public health on the Nipomo Mesa. In April 2018, a Stipulated Abatement Order was approved by the APCD Hearing Board. For more information on the numerous studies and all related documents, please click here

Efforts to reduce particulate matter on the Nipomo Mesa are underway through Stipulated Abatement Order 17-01 entered between the San Luis Obispo County APCD and California Department of Parks and Recreation Off-Highway Motor Vehicle Recreation Division (State Parks). The Order was approved by the APCD Hearing Board on April 30, 2018. This stipulated abatement order calls out specific actions to ensure significant reductions in particulate matter are achieved on the Nipomo Mesa over a five-year period. These actions include:

  • Formation of a Scientific Advisory Group (SAG) made up of experts in the fields of dune morphology, native plant cultivation and horticulture, as well as other fields, who will provide assistance to State Parks and the District in developing thoughtful and effective strategies to reduce dust.
  • Development of a Particulate Matter Reduction Plan (Plan) in the Fall of 2018 aimed at achieving state and federal ambient PM10 air quality standards.
  • Public outreach and inclusion in the form of workshops in the Winter/Spring of 2019 to review the draft Work Plan and solicit public comments and participation in review of the of the draft plan and SAG recommendations.
  • Integration of SAG and public comments into the Plan during the Spring of 2019.

An annual Report and Work Plan will be prepared with assistance from the SAG for each year of the five-year term of the Particulate Matter Reduction Plan for the Air Pollution Control Officer’s (APCO) approval. Each report will fulfill the following requirements:

  • Annual reports will review the dust controls implemented over the previous year, and using metrics specified in the approved Plan, will compare acheivements to increments of progress requirements approved in the previous Report.
  • Include increments of progress using tracking metric supplied in the approved Plan.
  • Provide for additional metrics to assess mitigation progress with input from the SAG.
  • Consideration of SAG recommendations for the mitigation techniques proposed in the annual Report.
  • Air quality modeling will be used to estimate the reductions of PM10 concentrations in populated areas due east of the ODSVRA on the Nipomo Mesa.
  • Detailed implementation schedules with deadlines associated with physical deployment of the mitigation, with duration of mitigation and anticipated impacts to emission reductions detailed
  • Methods to assess progress towards emission reductions.

The APCO will determine approvability of the Annual Reports and Work Plans (Reports) through the following process:

  • Draft reports will be submitted by State Parks to the APCO and SAG by August 1 of each year from 2019 through 2022.
  • The SAG will review each annual Report and submit comments to the APCO regarding the proposed control activities and recommendations for modifications to the proposed control activities no later than September 1 of each affective year.
  • After the SAG comments are incorporated, public workshop(s) will be held to review the Draft Work Plan and to receive public comment.
  • Upon conclusion of the public workshop the APCO will either approve the draft Work Plan or return the Work Plan to State Parks with an itemization of specific deficiencies for correction and reconsideration subsequent to the solicitation of public comments.
  • In October of each year from 2019 through 2022, the Hearing Board, upon request by the Chair or any two members, may convene a meeting to receive an informational update on the Report.