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recommend that checking and cleaning the effluent filter should normally be a part of the <br />service/maintenance procedure. <br />Biofilter® Enclosure integrity <br />Enclosures were fitted with hinged wooden access covers. The hinge fasteners (screws) <br />were inadequate to the stresses placed upon them and stripped out on Unit 1 (August 4, <br />2000). <br />Noise <br />The primary source of noise from the system is the sound of water being sprayed upon <br />the filter media. Noise levels were measured on 2/27/00 using a quest Model 2700 Sound <br />Level Meter calibrated by factor on 2/23/00 (NIST Traceable) using slow response and A <br />weighting. Levels were recorded 20 feet from the unit 4 feet above grade. Recorded <br />levels averaged 38.9 db. Some of the sound measured was contributed by an adjacent <br />technology. These levels were equivalent to background levels at the test site at the time <br />of measurement. <br />Ease of maintenance <br />Components which may require maintenance, such as the pump, the fan, the filter media, <br />the spray heads and spray manifold and the effluent filter were relatively easy to access <br />for servicing with one exception. The Biofilter® unit access cover was heavy because of <br />its size, and had to be propped open with a stick or other object, and due to its weight <br />presented a hazard to the service person. Waterloo Biofilter now uses smaller, lighter - <br />weight covers with large hinges secured by bolts to address these problems. <br />Performance Results — WaterlooBiofilter® Page 10 of 28 <br />