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discharge line, a 1 1/4" recycle line (blow off) was added onto the discharge line <br />with a valve. Opening and closing the valve would help control the flow <br />through the discharge line. The discharge line was piped using 2 -inch PVC <br />piping to the same location as the primary discharge in the open channel <br />downstream of the grit chamber. A 2 -inch valve was added at the end of the <br />discharge pipe to help calibrate and calculate the flow of the submersible pump. <br />Both pumps were used to pump a combined flow of 35,000 gpd (25 gpm). <br />During the study, only the primary pump (hose pump) was used when leachate <br />was fed at flow rate up to 21 gpm. Both pumps were used when flow rate of 25 <br />gpm was required. <br />Figure 2.3: Sump Pump Located in 21,000 -gallon Storage Tank <br />2. UV Transmittance Testing Equipment <br />UV transmittance is a practical test that can help measure the impact <br />constituents in the wastewater have on the UV intensity and the effectiveness of <br />UV disinfection. As the UV transmittance increases, the impact of constituents <br />in wastewater is not as significant allowing more light to penetrate the water and <br />inactivate organisms. When the UV transmittance decreases, it is an indicator <br />that a substance containing color or other particles is present and the UV light <br />cannot penetrate the water as effectively. <br />Prepared by: Bolton & Menk, Inc. Experimental Set -Up <br />Waste Management/Elk River Leachate Pilot Study I T21.109643 Page 5 <br />