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U.S. EPA NATIONAL ESTUARY PROGRAM

As part of the U.S. Environmental Protection Agency (EPA) National Estuary Program (NEP), laboratory testing was recently conducted to verify the suitability of both the EMC SQUARED® Dual Component System stabilizer products and the ROAD OYL® Resin Modified Emulsion product for use in stabilizing dirt roads and controlling erosion from land disturbing activities in areas adjacent to sensitive coastal estuaries. The testing was part of a feasibility study for reducing erosion and non-point source pollution conducted as part of the Mobile Bay National Estuary Program. The products had been in use previously on local county roads and evaluation for the National Estuary Program project included testing in an analytical laboratory to see if soil materials treated with these products displayed any evidence of contaminants at levels of concern to the EPA. Throughout the extensive series of tests conducted no regulated parameters were detected. As indicated in the text quoted below and laboratory data which follow the EMC SQUARED System Stabilizer treatments (EMC /EMS) and the ROAD OYL Resin Modified Emulsion treatment proved to be environmentally friendly in application.

Quoted from ANALYSIS OF ROAD MATERIALS AFTER APPLICATION

The road materials samples were analyzed for Oil & Grease (EPA 418.1 IR), Volatile Organic Analysis according to EPA method SW846-8260b, for Polynuclear Aromatic Hydrocarbons according to EPA method SW846-8310, and total levels of metals: Arsenic, Barium, Cadmium, Chromium, Lead, Mercury, Selenium, Silver, and Zinc. The samples were also analyzed via a full Toxicity Characteristic Leaching Procedure. Based on the analysis of the soil samples obtained, the levels for test parameters in the road material samples were all below method detection limits, with the exception of total zinc, which showed up in the EMC/EMS soil sample (Sherman Road) at 10mg/Kg, as shown in Laboratory Reports provided in Appendix B. The results for the TCLP analyses were also negative. In general, no hazardous components were identified and no leachable levels of any of the test parameters were identified.

Even though this study did not investigate application quantities of the alternative road paving materials needed to serve as an asphalt replacement, it is interesting to examine these results in view of the resulting potential run-off from the freshly applied EMC/EMS & Road Oyl treated test sections as compared to freshly applied asphalt road. A review of total levels of Oil & Grease, VOC, PAH, and total metals levels in a number of asphalt samples (data supplied by ACT Lab) revealed that asphalt can contain high levels of regulated parameters, even though asphalt is not a regulated waste when disposed of. Levels of Oil & Grease detected in new, freshly applied asphalt is in the hundreds of thousands of parts per million, while in old, weathered asphalt Oil & Grease is typically 30,000 mg/Kg or greater. And though VOCs and PAH compounds seldom show up in old asphalt, newly applied asphalt frequently contains measurable levels of many regulated VOCs and PAHs. Results for the analysis of several asphalt samples showed levels of arsenic and cadmium in the hundreds of mg/Kg range.

Effects on storm water run-off from Oil & Grease levels was available for a ship building facility, that had freshly applied asphalt pavement over approximately 30% of their yard. This ship building facility is required to obtain and analyze storm water run-off samples from seven outfalls on a monthly basis, in accordance with their NPDES permit. Their NPDES permit limit for Oil & Grease 15 mg/L. Up until the month before a new asphalt surface was applied, the facility had no violations noted on their NPDES, and the average Oil & Grease levels detected in all seven outfalls were typically less than 5mg/L, and had been that way for several years. However, after the new asphalt pavement was applied, 6 of the 7 outfalls had Oil & Grease levels exceeding their permit limit, with one oufall (adjacent to the largest asphalt paved area) showing an Oil & Grease level of 50 mg/L. For over three months (very wet months too, with a hurricane on the third month), several outfalls showed greater than 15 mg/L Oil & Grease. It was a year before the Oil & Grease levels dropped back down to below 5 mg/L for all the outfalls at that facility.

Based on the storm water samples obtained from the EMC/EMS and Road Oyl treated test sections, Oil & Grease levels were less than 2 mg/L on the storm water sampling event immediately following the application. No regulated parameters were detected in the EMC/EMS sample, nor in the Road Oyl sample. This supports the recommendations by the manufacturer, SSPCo, concerning use of these materials for replacing asphalt in sensitive environmental areas, such as through wetlands.

 

Soil Stabilization Products, Inc.
PO Box 2779
Merced, CA 95344

Toll Free: (800) 523-9992
Phone:     (209) 383-3296

Fax: (209) 383-7849

Email: INFO@SSPCO.COM

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