-
PM2.5 Air Trend Plots
PM2.5 data has been collected at most monitoring stations since 2000. Like PM10, maximum values also tend to occur during wintertime inversions. Also like PM10, trends are somewhat difficult to evaluate because weather plays such a large role in the data collected from year-to-year. This is why the standard is evaluated over a three year…
-
Serious Area PM2.5 State Implementation Plan (SIP) Development (2017-2019)
The Serious PM2.5 SIP Development is very much an iterative process. The technical foundation of any SIP involves numerous emissions inventories, air quality modeling assumptions, potential emission controls, and ever-fluctuating design values recorded throughout the air monitoring network. The PM2.5 Implementation Rule is very prescriptive about how these numbers must fit together to comprise an…
-
Control Strategies:
Serious Area PM2.5 SIPDisclaimer The Serious PM2.5 SIP Development is very much an iterative process. The technical foundation of any SIP involves numerous emissions inventories, air quality modeling assumptions, potential emission controls, and ever-fluctuating design values recorded throughout the air monitoring network. The PM2.5 Implementation Rule is very prescriptive about how these numbers must fit together to comprise…
-
Public Participation:
Serious Area PM2.5 SIPEPA reclassified two of Utah’s three PM2.5 Nonattainment areas from Moderate to Serious. The State must comply with additional requirements for its PM2.5 State Implementation Plan (SIPs) as a result of this reclassification. Under these new requirements, the State has reviewed its air-quality rules for area, point, and mobile sources and implemented Best Available Control…
-
Technical Analysis:
Serious Area PM2.5 SIPDisclaimer The Serious PM2.5 SIP Development is very much an iterative process. The technical foundation of any SIP involves numerous emissions inventories, air quality modeling assumptions, potential emission controls, and ever-fluctuating design values recorded throughout the air monitoring network. The PM2.5 Implementation Rule is very prescriptive about how these numbers must fit together to comprise…
-
Particulate Matter 10 (PM10) Overview
Particulate matter (PM) is a complex mixture of small, solid particles and liquid droplets in the air. PM10 is particulate matter that is 10 microns (μm) or less in diameter. It is a mixture of materials that can include soot, metals, salt, and dust. Major sources include: Air Quality Standards The health-based, National Ambient Air…
-
PM10 State Implementation Plans and Maintenance Plans
Nonattainment Areas In 1987, the EPA set new air-quality standards for PM10 of 150µg/m3 over a 24-hour period and an average of 50 µg/m3 annually. Utah was initially unable to meet the 24-hour standard and was required to prepare State Implementation Plans for Salt Lake and Utah County. Ogden City was designated nonattainment on September…
-
Utah’s Approach for Addressing Nutrient Pollution:
Nutrients in Utah’s Waters The significant increase in recent years of nitrogen and phosphorus in water bodies across the country has intensified water quality problems. Excess nitrogen and phosphorus in Utah waters harm our streams, rivers, and lakes. The Division of Water Quality (DWQ) is currently at work on a nutrient reduction plan tailored to the unique needs…
-
Ecological Study:
Nutrients in Utah’s WatersThe Utah Division of Water Quality conducted a study in 2010 to evaluate the ecological impacts of nutrient additions from POTWs on the State’s streams and rivers. The study was conducted on receiving waters above and below the discharges of eight mechanical treatment plants and one lagoon system. The Division studied these waters above and…
-
Economic Evaluation: Statewide Nutrient Criteria Development: Nutrients in Utah’s Waters
The Utah Division of Water Quality (DWQ) is funding a study to quantify the economic benefits and costs of implementing nutrient criteria for surface waters in Utah. Human-caused nutrient inputs of nitrogen and phosphorus to the nation’s waters have been identified as significant threats to aquatic life and recreational uses. In response, the US Environmental…
-
Publicly Owned Treatment Works Nutrient Removal Cost Impact Study: Nutrients in Utah’s Waters
The Utah Division of Water Quality conducted the 2009 Statewide Nutrient Removal Cost Impact Study to evaluate the economic impacts of potential new nutrient removal requirements for Utah’s publicly owned treatment works (POTWs). The study estimated economic, financial, and environmental impacts associated with a range of potential nutrient discharge standards for every discharging POTW in…
-
Statewide Nutrient Criteria Development: Core Advisory Team:
Nutrients in Utah’s WatersNext Meeting N/A 2017 April 3, 2017 2015 October 26, 2015 March 30, 2015 2014 September 8, 2014 March 3, 2014 2013 December 9, 2013 September 9, 2013 June 24, 2013 April 29, 2013 March 25, 2013 January 10, 2013 2012 October 11, 2012 August 9, 2012 May 30, 2012 March 21, 2012 February 14,…
-
Headwater Criteria:
Nutrients in Utah’s WatersOn June 26, 2019, Utah’s Water Quality Board passed numeric nutrient criteria to protect aquatic life and recreation uses in headwater streams effective date: July 1, 2019. This page contains background information on this important water quality standard revision. Documentation includes a classification report (4 MB) that demonstrates that statewide nutrient-response relationships are likely to…
-
Statewide Nutrient Criteria Development:
Core Advisory Team Members: Nutrients in Utah’s WatersStakeholder Group Representative Chair Erica Gaddis ([email protected]), Director, Utah Division of Water Quality Agriculture Thayne Mickelson ([email protected]), UDAF’s Conservation ProgramsJay Olsen ([email protected]), UDAF Agriculture Producers Jim Webb ([email protected]), Circle 4 Farms DEQ Public Information Christine Osborne ([email protected]), Alternate PIO Division of State Parks Jeff Rasmussen ([email protected]), Deputy DirectorTy Hunter ([email protected]) Division of Wildlife Resources Craig…
-
Resources:
Nutrients in Utah’s WatersUtah Investigations General Background EPA, State, and NGO Correspondence Supporting Literature Guidance Documents and Background Materials Updates from States on Numeric Nutrient Criteria Development Nutrient Criteria: Society of Freshwater Science: Special Session
-
Phosphorus Rule:
Nutrients in Utah’s WatersNew 2016 Amendment The Water Quality Board approved rulemaking for an amendment to the 2015 rule that addresses comments received from the regulated community regarding the time line for rule implementation. The amendment also incorporates a voluntary wastewater treatment optimization element designed to encourage nitrogen pollution reductions. Additionally, the amendment provides clarification of the phosphorus…
