Air Quality Division: Plans: State Implementation Plan (SIP) Capsules

The State Implementation Plans (SIP)s include nonattainment area plans, maintenance or limited maintenance plans, and control measure plans. The SIP capsules are for areas that currently have plans in development, are in the public process phase, or are final and have been submitted to the U.S. EPA Region IX. For SIPs in the development phase, the capsules contain information regarding stakeholder meetings and relevant background information. For SIPs in the public process phase, the capsules contain information regarding public hearings and comment periods. For submitted SIPs that have been acted on by the U.S. EPA, please visit U.S. EPA Actions. For prior SIP submittals for a given area please contact the Planning Section, (602) 771-2373.

Map of Nonattainment & Attainment Areas


Click for large image of area


Interactive GIS eMaps

Proposed SIPs and SIPs in Development

Final SIPs, Submitted to the U.S. EPA

Annual Reports

Limited maintenance plans contain requirements for the State to document continued maintenance of the National Ambient Air Quality Standards (NAAQS) once an area has been redesignated to attainment. Other SIPs have specific reporting requirements, such as Regional Haze, that require annual or periodic reporting for specific programs, measure, or commitments.

Eight-Hour Ozone Plan for the Maricopa Nonattainment Area (2008 Standard)
Contact: Bruce Friedl - (602) 771-2259
Summary: On March 12, 2008, the U.S. EPA revised the 8-Hour "primary" ozone standard to a level of 0.075 parts per million (ppm). States were required to make recommendations to the U.S. EPA no later than March 31, 2009, for areas to be designated attainment, nonattainment, and unclassifiable. On March 12, 2009, the Governor submitted recommendations for the 8-Hour ozone nonattainment area boundaries. Revised boundary recommendations were submitted to the U.S. EPA in December 2011. The U.S. EPA completed area designations for the 2008 ozone standards effective July 20, 2012. Please visit 8-Hour Ozone for the boundary recommendations and the U.S. EPA's designations. The U.S. EPA proposed a rule on the Implementation of the 2008 National Ambient Air Quality Standards for Ozone: State Implementation Plan Requirements on June 6, 2013, including Marginal Area Plans. The Maricopa Association of Governments is responsible for development of the Marginal Area Plans for the Maricopa Nonattainment Area.
Submittal Deadline: July 20, 2014
Informational Links: U.S. EPA: Ground-level Ozone: Regulatory Actions
Maricopa Association of Governments Environmental Programs
Plan Development Activities:
Proposed Plan:
Open of Comment Period:
Close of Comment Period:
Public Hearing:
Final Plan Submittal:
Final Plan Submittal Date:
U.S. EPA Action: Pending

Agricultural Best Management Practices (BMP) - Maricopa County PM10 Serious Area State Implementation Plan Revision
Contact: Lisa Tomczak - (602) 771-4450
Summary: The Maricopa County PM10 Serious Area failed to attain the NAAQS by the U.S. EPA's deadline of December 31, 2006. As a result of the Failure to Attain, the Maricopa Association of Governments (MAG) prepared a Five Percent Plan for Maricopa County as required under the Clean Air Act Section 189(d), which requires PM10 emissions to be reduced by five percent every subsequent year until the standard is attained, and that no violations occur at previously violating PM10 monitors. One such emission control measure adopted by the Legislature in 2007 and included in the plan enhanced the BMP requirements. ADEQ is currently revising the implementation plan for BMP to reduce PM10 from agricultural activities. The revision will account for legislative changes and additional best management practices adopted by the Governor's Agricultural Best Management Practices Committee.
Submittal Deadline: No legal deadline; tentative submittal December 2011.
Informational Links Arizona Department of Agriculture: Agricultural Consultation and Training Program
ADEQ: Agricultural Best Management Practices
Plan Development Activities Governor's Agricultural Best Management Practices Committee to review SIP revision prior to comment period.
Proposed Plan
Open of Comment Period
Close of Comment Period
Public Hearing
Final Plan Submittal
Final Plan Submittal Date
U.S. EPA Action

Arizona Cleaner Burning Gasoline Program
Contact: John Englander - (602) 771-4781
Summary: The Arizona Cleaner Burning Gasoline (CBG) program is a control measure introduced to reduce pollution from mobile sources in the Maricopa County metropolitan area and is relied on to aid the area in the reduction of ozone, carbon monoxide (CO), and particulate matter (PM) formation. This State Implementation Plan (SIP) revision provides an update of the Arizona CBG Program for federal approval and requests incorporation of Arizona’s revised CBG related statutes and rules into the Arizona SIP.
Informational Links 2004 Federal Action on the Arizona CBG Program
Proposed Plan 2013 Update to the Arizona State Implementation Plan for the Cleaner Burning
Open of Comment Period May 22, 2013
Close of Comment Period June 21, 2013
Public Hearing Friday, June 21, 2013, 2:30 p.m., ADEQ, Mail Office, Conference Room 145, 1110 W. Washington St., Phoenix, AZ
Final Plan Submittal
Final Plan Submittal Date
U.S. EPA Action

Douglas-Paul Spur PM10
Contact: Lisa Tomczak - (602) 771-4450
Summary The Douglas-Paul Spur Area was designated and classified as a moderate PM10 nonattainment area upon enactment of the 1990 CAAA as a result of monitoring violations of the PM10 NAAQS. ADEQ submitted a SIP for the Douglas portion of the nonattainment area in April 1993 and for the Paul Spur portion in July 1990; the U.S. EPA found the Douglas SIP to be complete, but did not act on the Paul Spur SIP. On January 11, 2011, the U.S. EPA Region IX issued a Clean Data Finding for the Douglas-Paul Spur Nonattainment Area based on ambient monitoring data from 1992-1994 that demonstrated the area reached attainment of the PM10 NAAQS by the deadline established by the 1990 CAAA.

The Center of Biological Diversity sued U.S. EPA on April 29, 2010, for failure to act on the Douglas-Paul Spur SIP and attainment determination for Clean Air Act deadlines. The deadline for a Federal Implementation Plan (FIP) is July 27, 2012, unless U.S. EPA approves a SIP provision. ADEQ is currently developing an update to the SIPs submitted to the U.S. EPA in 1993 and 1990.
Submittal Deadline Spring 2012
Informational Links Determination of Attainment by Attainment Deadline (76 FR 1532, effective February 10, 2011)
Final PM10 State Implementation Plan for the Paul Spur Group I Area (July 1990)
State Implementation Plan for the Douglas PM10 Nonattainment Area (April 1993)
Center for Biological Diversity vs. Jackson Consent Decree
Plan Development Activities Upon completion of SIP development activities, stakeholder meeting(s) will be conducted, culminating in a formal public notice and comment period and a public hearing prior to submittal of the plan to the U.S. EPA.
Proposed Plan
Open of Comment Period
Close of Comment Period
Public Hearing
Final Plan Submittal
Final Plan Submittal Date
U.S. EPA Action

Nogales PM10 Nonattainment Area Plan
Contact: Lisa Tomczak - (602) 771-4450
Summary Nogales was designated and classified as a moderate PM10 nonattainment area upon enactment of the 1990 CAAA as a result of monitoring violations of the PM10 NAAQS. The Center of Biological Diversity sued U.S. EPA on April 29, 2010, for failure to act on the Nogales SIP and attainment determination for Clean Air Act deadlines. The deadline for a Federal Implementation Plan (FIP) is July 27, 2012, unless U.S. EPA approves a SIP provision.
Submittal Deadline August 27, 2012
Informational Links Determination of Attainment by Attainment Deadline (76 FR 1532, effective February 10, 2011)
Final State Implementation Plan for the Nogales PM10 Nonattainment Area (June 1993)
Center for Biological Diversity vs. Jackson Consent Decree

The following documents were used to develop the emissions inventories for the Nogales Municipality, Sonora:
Mexico National Emissions Inventory, 1999: Six Northern States
Development of Mexico National Emissions Inventory Projections for 2008, 2012, and 2030
2005 Mexicali Emissions Inventory
ERG Presentation: Estimation of Paved and Unpaved Road Dust Emissions in Mexico
Mexicali and San Luis Colorado Unpaved and Paved Road Dust Data (Excel)

The Nogales PM10 Concentration and Met Analysis (Excel) contains the Nogales 2007 - 2009 ambient PM10 data and meteorological data, along with the analyses developed to support the Clean Air Act Section 179B Analysis in Appendices A - D of the Nogales SIP.
Plan Development Activities Upon completion of SIP development activities, stakeholder meeting(s) will be conducted, culminating in a formal public notice and comment period and a public hearing prior to submittal of the plan to the U.S. EPA.
Proposed Plan Revised SIP - Nogales PM10 Nonattainment Area and Appendices (Motor Vehicle Emissions Budget and onroad mobile emissions estimates revised, for more details see Appendix K)
Parallel Processing Request for Revisions to the Proposed SIP for the Nogales PM10 Nonattainment Area
Open of Comment Period July 24, 2012
Close of Comment Period August 23, 2012
Public Hearing August 23, 2012 - CANCELED
Final Plan Submittal Letter Regarding the Submittal of the SIP
2012 State Implementation Plan
Final Plan Submittal Date August 24, 2012
U.S. EPA Action

2012 5% Plans for PM10 for the Maricopa County Nonattainment Area and the Pinal County Township 1 North, Range 8 East portion
Contact Diane Arnst - (602) 771-2375
Summary ADEQ adopted the Maricopa Association of Governments (MAG) 2007 Five Percent Plan for PM10 and submitted it, along with the related plan for the Pinal County portion, to the U.S. EPA by the December 31, 2007 deadline. ADEQ submitted supplemental information for the Pinal County township June 4, 2008 and January 21, 2009. ADEQ submitted a negative declaration for commercial agriculture in theis Pinal County township June 12, 2009. ADEQ submitted a negative declaration for commercial agriculture in the Pinal County township on June 12, 2009. The EPA proposed limited approval/limited disapproval September 09, 2010. The standard was not attained by the December 31, 2010 deadline. ADEQ withdrew the plan on January 25, 2011. The EPA made a finding of failure to submit the plan and started sanctions clocks on February 14, 2011. ADEQ adopted and submitted the 2012 5% Plans on May 25, 2012, and submitted supplemental information June 22 and July 2, 2012. The EPA found the plans complete on July 20, 2012, stopping sanctions clocks. EPA concurred with Exceptional Events flags in letters dated September 6, 2012 and July 1, 2013. The EPA approved fugitive dust statutes for the plans on December 3, 2013. EPA published a Notice of Adequacy of the Motor Vehicle Emissions Budget on December 5, 2013. On February 6, 2014 EPA proposed approval of the plans, extension of the attainment deadline to December 31, 2012, and a finding of attainment by that deadline. Final approval is expected by May 2014.
Submittal Deadline August 14, 2012
Informational Links U.S. EPA Proposed Limited Disapproval of the Five Percent Plan, 75 FR 54806, September 9, 2010
U.S. EPA Finding of Failure to Submit the Five Percent Plan, 76 FR 8300, February 14, 2011
Exceptional Events Information
Final Plan Submittal Final MAG 2012 Five Percent Plan for PM10 for the Maricopa Nonattainment Area
Final 2012 Five Percent Plan for PM10 for the Pinal County Township 1 North, Range 8 East Nonattainment
Final Plan Submittal Date May 25, 2012
Supplemental Information on June 22, 2012 and July 2, 2012
U.S. EPA Action July 20,2012 Finding of Completeness Letter
December 3, 2013; 78 FR 72579
December 5, 2013; 78 FR 73188
February 6, 2014; 79 FR 7118
Final Approval Pending

Eight-Hour Ozone Plan for the Maricopa Nonattainment Area (1997 Standard)
Contact Bruce Friedl - (602) 771-2259
Summary In 2004, the U.S. EPA designated portions of Maricopa and Pinal Counties as nonattainment for the 1997 eight-hour ozone standard. A plan to demonstrate attainment of the standard by the 2008 ozone season was developed by the MAG and submitted to the U.S. EPA in 2007. A maintenance plan and redesignation request for the Maricopa Nonattainment Area was developed by MAG and submitted to the U.S. EPA in March 2009. The U.S. EPA has requested interim year modeling for 2016 and 2021.
Informational Links U.S. EPA: Technology Transfer Network / NAAQS: Ozone (O3) Implementation
ADEQ: 8-Hour Ozone
MAG Environmental Programs
Final Submittal Eight-Hour Ozone Plan for Maricopa Nonattainment Area
MAG Eight-Hour Ozone Redesignation Request and Maintenance Plan for the Maricopa Nonattainment Area
Final Submittal Date March 23, 2009
July 1, 2011: Supplemental Technical Analysis
U.S. EPA Action Pending

Bullhead City PM10 Limited Maintenance Plan Update
Contact John Englander - (602) 771-4781
Summary The 2012 Limited Maintenance Plan Update for the Bullhead City PM10 Maintenance Area provides discussion of the area's continued maintenance of the PM10 NAAQS, a review of the emissions inventory for the area, and a demonstration of continued maintenance in the area through 2022.
Final Plan Submittal 2012 Update of the Limited Maintenance Plan for the Bullhead City PM10 Maintenance Area
Final Plan Submittal Date May 24, 2012
U.S. EPA Action Pending

Hayden Sulfur Dioxide (SO2) Maintenance Plan
Contact Bruce Friedl - (602) 771-2259
Summary The Hayden area was designated by operation of law as nonattainment for the primary SO2 standards following the enactment of the 1990 CAAA. Copper smelting was demonstrated to be the primary source of SO2 emissions in the area. Emissions control regulations for the smelter were submitted to the U.S. EPA in 1979, which was approved January 14, 1983 (48 FR 1717). An attainment demonstration, maintenance plan, and redesignation to attainment request were submitted in 2002 and are currently under review by the U.S. EPA. A supplement updating emissions control regulations was submitted in 2002 (approved November 01, 2004; 69 FR 63321); a revised alternative test methods rule for copper smelters was submitted in 2006 (approved April 12, 2006; 71 FR 18624).
Final Submittal Hayden Sulfur Dioxide (SO2) Maintenance Plan - Does not include appendices
Final Submittal Date June 27, 2002
U.S. EPA Action Pending

Supplement to the Arizona State Implementation Plan (SIP) under Clean Air Act Section 110(a)(1) and (2): Implementation of 2006 PM2.5 National Ambient Air Quality Standards (NAAQS), 1997 PM2.5 NAAQS, and 1997 8-Hour Ozone NAAQS
Contact Danielle Hazeltine - (602) 771-4210
Summary This supplement to the State Implementation Plan (SIP) provides the necessary documentation and authority required to demonstrate that Arizona State and local air quality management programs meet the basic program elements required under Clean Air Act (CAA) Sections 110(a)(1) and (2) for implementing the 2006 PM2.5 National Ambient Air Quality Standards (NAAQS), the 1997 PM2.5 NAAQS, and the 1997 8-hour ozone NAAQS. This SIP is a supplement to the "Infrastructure" SIP that was submitted on October 14, 2009, for the 2006 PM2.5 NAAQS, the 1997 8-hour Ozone NAAQS, and the 1997 PM2.5 NAAQS.
Final Plan Submittal Part 1 – Arizona State Implementation Plan Revision under the Clean Air Act Section 110(a)(1) and (2); 2006 PM2.5 National Ambient Air Quality Standards (NAAQS), 1997 PM2.5 NAAQS, and 1997 8-Hour Ozone NAAQS
Part 2 – Arizona State Implementation Plan Revision under the Clean Air Act Section 110(a)(1) and (2); 2006 PM2.5 National Ambient Air Quality Standards (NAAQS), 1997 PM2.5 NAAQS, and 1997 8-Hour Ozone NAAQS
Final Plan Submittal Date August 24, 2012
U.S. EPA Action Proposed Rule – 110(a)(1) & (2) Infrastructure – 1997 O3 & PM2.5 and 2006 PM2.5
Final Rule – 110(a)(1) & (2) Infrastructure – 1997 O3 & PM2.5 and 2006 PM2.5
Final Rule – 110(a)(1) & (2) Infrastructure – 1997 O3 & PM2.5 and 2006 PM2.5 – Emergency Episodes Rule
Final Rule – 110(a)(1) & (2) Infrastructure – 1997 O3 & PM2.5 and 2006 PM2.5 –Pima County Rules

Revision to the Arizona State Implementation Plan under Clean Air Act Section 110(a)(1) and (2): Implementation of 2008 8-Hour Ozone National Ambient Air Quality Standards (NAAQS)
Contact Danielle Hazeltine - (602) 771-4210
Summary

This revision to the Arizona State Implementation Plan (SIP) incorporates by reference the statutes and rules, which have already been submitted and approved by the EPA in order to demonstrate that Arizona State and local air quality management programs meet the basic program elements required under Clean Air Act (CAA) Sections 110(a)(1) and (2) for implementing the 2008 8-hour ozone NAAQS. 

Final SIP Document Arizona State Implementation Plan Revision under the Clean Air Act Section 110(a)(1) and (2); 2008 8-Hour Ozone NAAQS
Final Submittal Date December 27, 2012
U.S. EPA Action Findings of Failure To Submit a Complete State Implementation Plan for Section 110(a) Pertaining to the 2008 Ozone National Ambient Air Quality Standard and
EPA Completeness Letter

Revision to the Arizona State Implementation Plan (SIP) under Clean Air Act Section 110(a)(1) and (2): Implementation of the 2010 NO2 National Ambient Air Quality Standards (NAAQS)
Contact Danielle Hazeltine - (602) 771-4210
Summary

This revision to the Arizona State Implementation Plan (SIP) incorporates by reference the statutes and rules already submitted and approved by the EPA in order to demonstrate that Arizona State and local air quality management programs meet the basic program elements required under Clean Air Act (CAA) Sections 110(a)(1) and (2) for implementing the 2010 Nitrogen Dioxide (NO2) NAAQS.

Final SIP Document Arizona State Implementation Plan Revision under the Clean Air Act Section 110(a)(1) and (2); 2010 NO2 NAAQS
Final Submittal Date January 18, 2013
U.S. EPA Action Pending

Arizona State Implementation Plan (SIP) Revision under Clean Air Act Section 110(a)(1) and (2) - "Infrastructure" for 2008 Lead National Ambient Air Quality Standards (NAAQS)
Contact Lisa Tomczak - (602) 771-4450
Summary In October 2008, the U.S. EPA revised the NAAQS for Lead (Pb) (71 FR 61144, October 17, 2007). Clean Air Act (CAA) Section 110(a)(1) requires states to submit SIP revisions or certify that the existing elements or "infrastructure" of its air quality management programs are adequate to meet the requirements of CAA Section 110(a)(2) for the revised standards. This document describes the authorities and infrastructure of State and local air quality management programs in Arizona to provide for implementation, maintenance, and enforcement of the 2008 Pb standards.
Final Submittal Arizona SIP Revision under Clean Air Act Section 110(a)(1) and (2): Implementation of 2008 Lead National Ambient Air Quality Standards
Final Submittal Date October 14, 2011
U.S. EPA Action Pending

Miami PM10 Nonattainment Area Limited Maintenance Plan and Request for Redesignation
Contact Lisa Tomczak - (602) 771-4450
Summary In July, 2006, ADEQ requested the Hayden/Miami PM10 Nonattainment Area be split into separate nonattainment areas. On January 24, 2007, the U.S. EPA concurred with ADEQ's request, and the Hayden/Miami PM10 Nonattainment Area was officially split. In the same rule, the U.S. EPA issued a clean data finding for the Miami PM10 Nonattainment Area. On July 25, 2008, ADEQ submitted to the U.S. EPA the Miami Moderate Area PM10 Limited Maintenance Plan and Request for Redesignation to Attainment.
Final Plan Submittal Miami Moderate Area PM10 Limited Maintenance Plan and Request for Redesignation to Attainment
Final Plan Submittal Date July 25, 2008
U.S. EPA Action Pending

New Source Review
Contact Steve Burr - (602) 771-4251
Summary The purpose of this State Implementation Plan (SIP) revision is to bring the State of Arizona's SIP for areas under the jurisdiction of the Arizona Department of Environmental Quality (ADEQ) into compliance with the New Source Review (NSR) requirements of section 110(a)(2)(C) and 40 C.F.R. Part 51, Subpart I. The revision includes rule amendments to (1) update ADEQ's major NSR rules to reflect current federal requirements and (2) add minor NSR requirements.
Informational Links U.S. Environmental Protection Agency New Source Review
Docket Opening: November 04, 2011 (17 A.A.R. 2280)
Proposed Rulemaking: November 04, 2011 (17 A.A.R. 2192)
Notice of Final Rulemaking
Final Plan Submittal State Implementation Plan New Source Review
2013 Supplemental Information - Certified Copies
2014 Supplemental Information - State and County Jurisdiction - Public Review Draft
Final Plan Submittal Date October 29, 2012
U.S. EPA Action Pending

Payson PM10 Limited Maintenance Plan Update
Contact John Englander - (602) 771-4781
Summary The Limited Maintenance Plan Update for the Payson PM10 Maintenance Area updates the 2002 Moderate Area PM10 Maintenance Plan and Request for Redesignation to Attainment, providing for the maintenance of the national primary ambient air quality standard for the years 2012 through 2022.
Final Plan Submittal 2012 Update of the Limited Maintenance Plan for the Payson PM10 Maintenance Area
Final Plan Submittal Date January 23, 2012
U.S. EPA Action Pending

Regional Haze State Implementation Plan (SIP) for 40 CFR 51.308
Contact Lisa Tomczak - (602) 771-4450
Summary ADEQ is developing a SIP in compliance with requirements of the Regional Haze Rule 40 CFR 51 Section 300 through 309 to prevent any future and remedy existing visibility impairment at mandatory Class I Federal areas (CIAs). This plan will provide reasonable progress and long-term strategies for Arizona's twelve CIAs.
Submittal Deadline December 31, 2010
Informational Links ADEQ: Regional Haze and Visibility
Western Regional Air Partnership (WRAP)
U.S. EPA: Regional Haze Program
Plan Development Activities ADEQ is currently working with the WRAP and other western States to analyze technical information that will be used for addressing reasonable progress toward visibility goals for each of the eight CIAs and the national visibility goal (Clean Air Act Sections 169A and 169B).
Open of Comment Period October 28, 2010
Close of Comment Period December 02, 2010
Public Hearing December 02, 2010
Final Submittal Arizona Regional Haze State Implementation Plan Under Section 308 of the Federal Regional Haze Rule
Submittal Date March 02, 2011
U.S. EPA Action Pending

Rillito PM10 Nonattainment Area Limited Maintenance Plan and Request for Redesignation
Contact Lisa Tomczak - (602) 771-4450
Summary The Ajo area was designated and classified as a moderate PM10 nonattainment area upon enactment of the 1990 CAAA as a result of monitoring violations of the PM10 NAAQS. In April 1994, ADEQ submitted a SIP for the Rillito PM10 Nonattainment Area; the U.S. EPA did not act on the SIP. On October 10, 2006, the U.S. EPA determined the Rillito Nonattainment Area met the NAAQS for PM10 and qualified for redesignation to attainment. On July 10, 2008, ADEQ submitted the Rillito Moderate Area PM10 Limited Maintenance Plan and Request for Redesignation to Attainment.
Final Submittal Rillito Moderate Area PM10 Limited Maintenance Plan and Request for Redesignation
Final Submittal Date June 20, 2008
U.S. EPA Action Pending

Stage II Vapor Recovery
Contact John Englander - (602) 771-4781
Summary This revision updates the Arizona SIP with the most recently adopted statutes and rules applicable to Stage II vapor recovery requirements at service stations dispensing gasoline and other motor fuels.
Submittal Deadline September 2009
Informational Links ADEQ: Vehicle Emissions Inspection Program (VEIP)
Open of Comment Period July 27, 2009
Close of Comment Period August 26, 2009
Public Hearing August 26, 2009
Final Submittal Arizona State Implementation Plan Revision Update to the Stage II Vapor Recovery Program
Submittal Date September 21, 2009
U.S. EPA Action

Yuma PM10 Maintenance Plan
Contact Diane Arnst - (602) 771-2375
Summary Yuma was designated a Moderate PM10 nonattainment area by operation of law in the 1990 CAAA. A SIP revision was submitted in 1991, and a supplement was submitted in 1994 adopting a range of PM10 control measures and demonstrating attainment with the NAAQS. The U.S. EPA took no action on these plans. An exceedance of the PM10 standard occurred on August 18, 2002, which was flagged as a natural exceptional event. ADEQ developed and submitted a Natural Events Action Plan (NEAP) to the U.S. EPA on February 17, 2004, pursuant to the U.S. EPA's Natural Events Policy, in effect at that time, and submitted a NEAP Implementation Report to the U.S. EPA February 17, 2005 with a maintenance plan due 18 months thereafter. In compliance with this requirement, ADEQ developed and submitted the Yuma PM10 Maintenance Plan to the U.S. EPA. Exceptional Event Rule documentation for 2008 and 2009 exceedances is in development.
Final Plan Submittal Yuma Maintenance Plan
Final Plan Submittal Date August 16, 2006
U.S. EPA Action Pending