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in production between 2011 and 2016. As such, truck traffic to and from the plant is expected to <br />correspondingly increase with the increased production. Hazardous wastes in the form of motor <br />oil, antifreeze, and transmission fluid are possible pollutants that can be present with these trucks <br />when they arrive at the plant. <br />As noted in the previous section, the trucks are loaded with product inside the storage silo to <br />minimize the possibility for wastes to be incorporated into stormwater discharge. On a weekly <br />basis, the NSI driveway and silo entrance port are inspected for truck waste. If wastes are found <br />upon inspection, the wastes are manually cleaned up by way of shoveling and disposal in an <br />appropriate refuse container. If a leak is large enough, absorbents will be used to draw up as <br />much of the fluid as possible before the remaining affected area can be removed and disposed of <br />properly. <br />2.2.1.5 Conveyance <br />Product is transported from the processing line within the plant to the storage silo by way of a <br />series of conveyor belts (Figure 2). The only potential pollutant present in this part of the <br />industrial activity is the solid sodium bicarbonate product, which is a non - hazardous substance as <br />mentioned above. The conveyor belts are enclosed, but a slight amount of sodium bicarbonate <br />dust may escape through joints and can sometimes accumulate on the ground below the <br />conveyance line. <br />In order to mitigate the amount of sodium bicarbonate dust that can escape the conveyance line, <br />it is entirely contained in a containment enclosure. The vast majority of dust effusing from the <br />conveyor is captured in dust collectors located in the plant and on the silo. Most of the sodium <br />bicarbonate that finds its way off the conveyor belt is contained within the containment enclosure <br />and is able to make its way to the storage silo. Sodium bicarbonate dust that falls to the ground <br />from the conveyance line is swept and washed to the product cleanup drain, which empties into <br />the process pond. <br />2.2.1.6 Process/Waste Pond <br />An evaporation pond is used for containment of process water and disposal of waste streams <br />(Figure 1). The pond consists of two compartments of approximately three and seven acres, <br />respectively. The smaller compartment is provided to contain plant spills or excess process <br />solution overflow. The solutions collected in this compartment are pumped back to the plant for <br />recycling. The larger compartment contains utility waste streams such as cooling tower blow <br />down, boiler blow down, and water softener regeneration purge. <br />The pond has a double liner with a leak detection system. The primary liner (top) is 60 mil. high <br />density polyethylene (HDPE). The secondary liner is 40 mil. HDPE. Drainage netting was used <br />between the two liners to assist flow of potential leakage from the primary liner to a sump <br />between the liners where it will be recycled and limit potential leakage through the 40 mil liner. <br />Daub & Associates, Inc. NSI 2011 SWMP <br />Page 6 <br />