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W. W. WHEELER <br />& ASSOCIATES, INC. <br />Water Resources Engineers <br />3700 S. INCA STREET I ENGLEWOOD, C❑ SO 1 0-3405 <br />303-761 -41 30 1 FAX 303-76 1-2f302 <br />TECHNICAL MEMORANDUM <br />December 17, 2014 <br />To: Sam Wood <br />From: Doug Maclaren, P.E. <br />No: 1333.01.07 <br />Re: Henderson Mill Seepwater Collection System Piping Hydrostatic test <br />WWW.WWWHEELER.0❑M <br />On December 16, 2014, the 6 -inch HDPE pipeline for the seepwater collection system was <br />hydrostatically tested. The section of line tested was from the first collection well vault to the <br />discharge point. Sam Wood and other Henderson personnel performed the test and Doug <br />Maclaren with W. W. Wheeler observed the procedure. <br />The line was tested using the basic procedure in the Plastic Pipe Institute's "Non -monitored <br />make-up water" test. A blind flange as installed at the discharge end and the isolation valve to <br />the pump was closed. The line was filled with water and then pressurized to 100 psi (measured <br />with a test gage at the discharge end). The 100 psi pressure was held for 1 hour with no need <br />to add additional water to maintain this pressure. After the 1 hour pressurization period, the <br />pressure was reduced to 90 psi and then monitored for an additional 1 hour period. At the end <br />of the second period, the pressure was again measured, and found still be at 90 psi. During the <br />hold period, the line was inspected for visible leaks, with none found. Based on the criteria for <br />this test, the line was found to have no leaks and is ready for use. <br />R:\1300\1333\1333.01\1333.01.07 (Extraction Wells)\DOCUMENTS\2014 December 17 Hydro Testing.docx <br />