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Project Understanding <br /> SEH water tower inspection professionals performed a tank evaluation <br /> on the 400,000 gallon hydropillar tank located directly north of Orono <br /> City Hall, on December 6, 2012. <br /> A cornpilation of the inspection photos has been included in the <br /> Appendix of this proposal for your re��ew. <br /> The tank was erected in 1992 by Pittsburg-Des Moines on a site <br /> adjacent to City Hall and the public works equipment yard (photo 3). <br /> There is no perimeter security fencing, however the tank is secured by <br /> a locked access doors to the center column (photo 12) and is located <br /> in an area frequented by both City police and public works staff. <br /> . ,=�_-- There are two exterior telecommunications buildings/pads located on <br /> , tank site (photos 4-5). From our observations, there are at least nvo <br /> �� � active telecom carriers (Sprint/Nextel) housed within the adjacent <br /> ��-��� , <� � � � building/pad,with cabling attached to the tank and antennas on the <br /> � ="' 1 �I'. �-'�� <br /> top of the tank. <br /> i A __ <br /> �; .+� <br /> �' �• �� ,�. � ' �., The tank is a hydropillar-style tank with a fluted center column. Based <br /> �`���� on our inspection, the supporting foundation of the center fluted <br /> rF��e���severol telecorn ports locoted column was found to be in good condition (photos 7-8). There a few <br /> at the base of c►,e�i�ced�ol��,�. locations with minor grout deterioration and/or corrosion near the <br /> foundation plate, however, the grout is in overall good condition. <br /> The overflow pipe is ten inches in diameter and is in good condition <br /> (photos 8-9). The screen on the overflow has been well-maintained <br /> and does not show signs of dirt and/or debris (photo 9). The <br /> overflow pipe drains onto some rip rap adjacent to the foundation and <br /> flows away from the tank. <br /> Access to the tank is pro��ided through a locked double service door <br /> (photo 12). This access point meets industry standard security <br /> requirements. The bottom of the center fluted column is used for City <br /> storage. The base level of the dry interior presently houses corrugated <br /> piping, buoys, and other miscellaneous items (photos 51-52). There <br /> was no pit piping visible on the tank, however, there was valve and <br /> control equipment present (photos 54-55). <br /> Access to the elevated water tank is provided by a series of ladders <br /> located on the exterior wall within the center column/dry riser <br /> (photo 58). The first of the series of ladders rises from the floor and <br /> proceeds to the cat�valk connected to the center access tube. There is <br /> no catchment device present on the tank. The ladders are staggered <br /> at approximately 20-foot intervals.All of the ladders ascending to the <br /> catwalk have a safety cage,but do not have a fall prevention devices <br /> installed. <br /> project understanding � page I <br />