Soilworks products are the industry’s top standard due to our insistence on creating high performance soil stabilization and dust control products that stand up to rigorous testing – both in the lab and in the field. Our commitment to quality and performance has led to our involvement and testing in hundreds of real-world situations. The following library of reports, presentations, specifications, approvals and other similar documents provide you, our customer, the transparency and dependable assurance that is expected from Soilworks.
Project Participants
n David Reisman, US EPA- National Risk Management Research Lab, Cincinnati, Ohio
n Karen Irwin, US EPA Region 9, Project Manager
n Rodney Langston, Sr. Planner, Clark County DAQEM
n Jo Crumbaker, Manager Planning, Maricopa County DAQM
n Fred Hall, EQM- Project Manager, Las Vegas
n William Kemner, EQM, Project Director, Las Vegas
n Dr. Ed Beighley, Lab. Director Soil Erosion Research Lab, SDSU
Topics of Discussion
n Selection of Suppressants to be tested
n Selection of soil types
n Precautions taken to ensure defensible results
n Development of specific Test Procedures
n Evaluation of Results
n Reporting
Objectives
n Determine the water quality impacts of each dust suppressant in a simulated real world environment
n Focus on products typically used in the desert Southwest
n Focus on construction activity, as opposed to road or pile surface stability
Suppressants Selected for Study
Soil Selection Criteria
n No visible contamination
n Native land, no farming/industrial history
n Normal soil range of metals
n 6010 test for metals
n 7471 test for Mercury
Soils Selected
n Clark County AQMD and Maricopa County AQD recommended sample locations
n Based on soil maps of each county
n Maps classify soils by texture and dust-emitting potential
n One-Gallon Samples –5 per county
n Bulk Samples (five cubic yards) – 1 per county
Sampling Locations in Clark County
Sampling Locations in Maricopa County
Soil Samples
n One gallon samples taken by hand
n Evaluate sensitivity of select water quality parameters to soil chemistry differences
n Bulk samples – taken by excavators
n Pre-tests for metals contamination
n Shipped to SDSU-SERL in super sacks
Soil Processing
n Sizeable rocks and debris removed
n Performed sand, silt, and clay analysis
n Thorough mixing at laboratory
n Chain of custody procedures followed
Test Protocol
n Control Plots Treated with Reverse Osmosis Water Only
n Surface Leaching (Runoff to Surface Waters)
n Simulated rainfall (0.7, 1.3, and 2.4 inches/hour)
n Simulated heating
n Tested for general chemicals of concern
n Tested for aquatic toxicity (fish, algae, and invertebrates)
n Column Migration (Potential to Reach Groundwater – Subsurface Leaching)
n Migration rate
n Tested for general chemicals of concern
Sample Preparation
n One of two reapplication/soil disturbance scenarios
n A-Soil surface raked daily and product applied each day
n B-Soil surface raked daily and product applied on days 1, 3, and 5
n For synthetic products, B scenario was higher initial application and no reapplication
n Duration for both scenarios is consecutive 5-day period following initial application
n Each of 5-days, soil raked in alternating directions
n Reapplication rates same as original application
Rainfall Events
n 0.7 inches per hour for 150 minutes
n 1.3 inches per hour for 80 minutes
n 2.4 inches per hour for 43 minutes
Soil Bed Layout
Products Tested
Experimental Parameters
Analytical for Runoff and Leachate
n Ph
n Electrical Conductivity
n TSS
n TDS
n DO
n TOC
n Nitrate and Nitrite
n Total Phosphorous
n Aquatic Toxicity (Runoff only)
Qualitative Analysis of Test Results
n Surface Leaching Tests
n All six products met study DQOs for pH, TDS, TOC, DO, and Nitrate
n Most significant effect – High TSS in runoff from soils treated with Durasoil and EnviroKleen
n AZ soil runoff typically had higher conductivity, TDS, TOC, nitrate, nitrite, and phosphate
n NV soil runoff had higher pH and TSS
n DO similar for both soils
n Vertical Migration Tests
n Water migration through a 12-inch column of soil
n Average results by product for eight of nine parameters meet DQOs
n TSS results varied but typically not a concern for groundwater quality
n Pilot Tests
n Evaluated soil/water/product mixtures
n TDS for Enviro Roadmoisture 2.5 and Durasoil samples significantly higher than control samples – Not observed in runoff tests
Aquatic Toxicity Tests
n Runoff samples for toxicity collected as part of SDSU’s surface leaching tests
n Toxicity tests conducted by EPA Region 9 Lab
n Fish (flathead minnow) – acute tests
n Algae – chronic tests
n Invertebrate (Daphnia Magna) – acute tests
n Control samples based on RO-water only
n Fish Tests
n No toxicity to fish observed in any runoff sample
n Algae tests
n No toxicity to algae observed in any runoff sample
n Test may underestimate impact due to fine filtration of samples to remove sediments required by test protocol
n Invertebrate Tests – Daphnia magna
n For 4 surfactants, majority of samples showed no toxic effect relative to control samples
n Adverse physical effect on daphnids for Envirokleen and Durasoil samples compared to control (Daphnids trapped on surface not able to re-enter water column).
n Additional tests with smaller invertebrate (Ceriodaphnia Dubia) conducted on product samples of Envirokleen and Durasoil did not show physical entrapment effect.
http://www.epa.gov/region09/air/dust/Dust Suppressants-sept2008.pdf
Copyright Soilworks, LLC 2003-. All Rights Reserved. Soilworks®, Soiltac®,
Gorilla-Snot®, and Durasoil® are registered trademarks of Soilworks, LLC.
Copyright Soilworks, LLC 2003-. All Rights Reserved. Soilworks®, Soiltac®,
Gorilla-Snot®, and Durasoil® are registered trademarks of Soilworks, LLC.