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HomeMy WebLinkAbout015_SURFACING_OM September 2, 2022 Project No. 17032.05 ALTERNATIVE SURFACING MAINTENANCE PLAN FOR NORTHWESTERN ENERGY EAST LOT BOZEMAN, MT OVERVIEW NARRATIVE Gravel surfacing has been proposed for the Northwestern Energy’s east storage yard in order to minimize the level of improvement and regrading required in the floodplain, and to provide a surface that is consistent with their existing storage yard on Griffin Drive and the gravel access road that has been constructed between their existing yard and the proposed east storage yard. Due to the close proximity to the East Gallatin River, Earthbind Stabilizer by EnviRoad has been recommended for dust abatement as a more environmentally friendly alternative to traditional agents of magnesium and calcium chloride. The following outlines Northwestern Energy’s plan for maintenance of the proposed surfacing. I. Gravel Surface Northwestern Energy will provide periodic regrading of the gravel surfacing to ensure the surface is kept free from potholes, washboarding, and powder or loose stones on the surface. It is anticipated that this will consist of regrading and rolling the surface on an annual basis. II. Earthbind Stabilizer In accordance with the attached manufacturer’s guidelines for the initial application and periodic maintenance of surfacing, the following is recommended: · Apply Earthbind stabilizer at a concentration of 0.12-gallons per square yard on low volume roads. · Dilute with water at a ratio of 5:1 (5 parts water to 1 part concentrate). · Apply with a pressurized water truck according to the attached manufacturer's guidelines. · Reapplication should occur on an annual basis or more frequently if snow is plowed during the winter months. V:17032_NWE_SURFACING_OM_090122.doc (09/01/22) DRS III. Responsible Party Northwestern Energy will be responsible for the maintenance of all gravel surfacing within the east storage yard. I agree to the proposed maintenance plan above. Signature: __________________________________________ Northwestern Energy Representative 9/2/22 6/22/2022 Example of a Typical Earthbind® Dust Control Procedure using a Pressurized Water Truck Earthbind® is considered to be an environmentally-friendly bio-based modified asphalt emulsion that is specifically made for dust control. Earthbind can be applied in various concentrations and dilution ratios using a pressurized or gravity fed water truck. Frequently we recommend 0.12-gallons of Earthbind® concentrate per square yard on low volume roads. This Earthbind concentrate is mixed with water for application purposes. Earthbind® is shipped in a concentrated liquid form and is normally diluted with water (5-parts water to 1-part concentrate) and applied to an unpaved surface using a pressurized water or distributor truck at a rate of 0.35-gallons per square yard in two applications. Once the water used to make the Earthbind® solution dries, the product is considered to be cured. The residual remaining on your road will bind the loose particles together keeping them from blowing off as fugitive dust and washing off as suspended solids. Following is a quick overview of a procedure regarding topical dust control using a 5 to 1 solution of Earthbind® concentrate applied with a pressurized water truck. Note that this procedure assumes that the road prior to treatment is in fairly good shape, meaning that there are no potholes, washboarding, powder or loose stones on the surface. These imperfections can be resolved using a motorgrader and roller. The longevity of dust control can be compromised if product is applied to a road that is in poor condition. Required Equipment and Supplies  Pressurized water truck with a tank at least 500-gallons in volume and is capable of applying ¼ to ½-gallons of a liquid, per square yard, fairly evenly and accurately.  Heavy-duty pump and hoses or equivalent to transfer concentrate from the totes or tanks into water truck and to mix product in totes/tank;  Clean water to make the Earthbind solution; and  Earthbind Concentrate Procedure 1) Mix the Earthbind® concentrate in the tote or storage tank thoroughly before diluting with water. Mix only enough solution that will be used for the specific project within a couple of days; 2) Transfer the mixed Earthbind concentrate (e.g., pump and hoses) into the water truck; 3) Mix the Earthbind concentrate with water in the water truck to make the 5:1 solution (this is 5-parts water to 1-part product concentrate. The diluted Earthbind is considered to be the Earthbind solution; 4) Mix the Earthbind solution thoroughly; 6/22/2022 5) Using the pressurized water truck, apply the 5:1 Earthbind solution evenly to the road surface at a rate approximately 0.35-gallons per square yard. (Basically, this is a rate that is strong enough where the solution infiltrates the road adequately without pooling up). Please note that you want a tank on your water truck that is large enough to allow spray coverage over a significant area before running out of product solution. You will compromise effectiveness if you have to stop the project multiple times before the area is completely treated. 6) Allow the applied Earthbind solution to infiltrate into the road surface. Once the first application of the Earthbind solution has soaked into the material, and is still moist but not overly wet…then; 7) Apply the final 0.35-gallon shot of the 5:1 Earthbind solution per square yard. 8) Once all the water used to make the Earthbind solution has evaporated, the product is considered to be cured and procedure is complete. The warmer and drier the weather, the faster the applied Earthbind solution will dry. 9) With water, wash off all equipment used to mix and apply the Earthbind. Note, it will be hard to clean if you let the solution dry in the sun. Please feel free to contact an EnviRoad sales engineer at 503.279.2606 if you have any questions regarding application or need more information regarding Earthbind.