Study

EVALUATION OF ENVI-ROX 2000
An Arizona dust control study
INTRODUCTION AND PURPOSE
Envi-Rox 2000 is a surface-applied dust suppressant produced from ponderosa pine resin used to control fugitive dust from unpaved roadways. While the effectiveness of Envi-Rox 2000 has been reported to be quite good, no studies have been conducted to directly evaluate its effectiveness. TheCENE 330 Air Quality Engineering course at Northern Arizona University, frequently seeks opportunities to integrate field-oriented emissions inventory project activities as a way to gain practical experience with air quality issues. During the Fall 2003 semester, this course was able to integrate an evaluation of Envi-Rox 2000 for this purpose.

The overall purpose of performing this study was to provide students with an understanding of and the actual experience of conducting a particulate matter (PM) emissions inventory for both paved and unpaved roads. The evaluation of Envi-Rox 2000 was specifically conducted as part of this overall study for the purpose of determining PM emission estimates before and after application to a section of unpaved road. This report present only the data and results of the emission inventory project that relates directly to the ability to evaluate Envi-Rox 2000 effectiveness as a dust suppressant.
INTRODUCTION AND PURPOSE
Envi-Rox 2000 is a surface-applied dust suppressant produced from ponderosa pine resin used to control fugitive dust from unpaved roadways. While the effectiveness of Envi-Rox 2000 has been reported to be quite good, no studies have been conducted to directly evaluate its effectiveness. TheCENE 330 Air Quality Engineering course at Northern Arizona University, frequently seeks opportunities to integrate field-oriented emissions inventory project activities as a way to gain practical experience with air quality issues. During the Fall 2003 semester, this course was able to integrate an evaluation of Envi-Rox 2000 for this purpose.

The overall purpose of performing this study was to provide students with an understanding of and the actual experience of conducting a particulate matter (PM) emissions inventory for both paved and unpaved roads. The evaluation of Envi-Rox 2000 was specifically conducted as part of this overall study for the purpose of determining PM emission estimates before and after application to a section of unpaved road. This report present only the data and results of the emission inventory project that relates directly to the ability to evaluate Envi-Rox 2000 effectiveness as a dust suppressant.
PROJECT DESCRIPTION AND METHODS
Each fall semester the CENE 330 Air Quality Engineering class conducts emissions inventory projects as a means to provide students with hands-on experience of conducting an emissions inventory. This project-based learning approach has been successful in providing students with a much better understanding and reinforcement of what an emission inventory involves than what would otherwise be possible through a traditional series of lectures.
During the fall 2003 semester, the CENE 330 class was presented with a project that would conduct a PM emissions inventory for the paved and unpaved roads at Fort Tuthill County Park in Coconino County, Arizona. Also, during the course of this semester, Lyman Dust Control was scheduled to apply Envi-Rox 2000 to approximately a one-third mile section of unpaved road and an evaluation of dust suppressant effectiveness was incorporated as part of the overall emissions inventory project.The section of unpaved road was scheduled to receive an application of Envi-Rox 2000 is located along the west and north sides of the park’s grandstand and racetrack facility. Sampling of the loose material along this section of road was conducted at two separate locations, as shown in Figure 1. Samples were collected at each location and analyzed before and after the dust suppressant was applied to the road’s surface.The field sampling and laboratory analysis methods in AP-42 for determining unpaved road PM emission factors (US EPA, Compilation of Air Pollutant Emission Factors, Volume I: Stationary Point and Area Sources, Chapter 13 Miscellaneous Sources, Section 13.2.2, Unpaved Roads) were used during this study to evaluate the effectiveness of the Envi-Rox 2000 dust suppressant.
Figure 1. Unpaved road application of dust suppressant and sampling locations.
SOIL SAMPLE RESULTS
Samples of loose surface material were collected during the week prior to application and again from one to two weeks after application. Two samples were collected from each location prior to the application of dust suppressant and one sample was collected at each location afterward. Once collected, these samples were transported to the laboratory. Each sample was analyzed for soil moisture content and then sieved to determine the silt fraction or percent fines less than the 200-mesh screen. The results of these analyses are shown in Table 1 below.
SOIL MOISTURE AND SILT ANALYSIS RESULTS FOR UNPAVED ROAD SURFACE MATERIAL BEFORE AND AFTER APPLICATION OF ENVI-ROX