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<br /> o , <br /> <br /> Draft Environmental Assessmen June, 1998 <br /> Old Hilo Wastewater Treatment Plant Page 5 <br /> <br /> Sludge Pump, Sludge Control and Sludge Centrifuge Buildings <br /> <br /> The sludge pump building is located next to the primary clarifiers, and the sludge control building <br /> is located next to the digestion tanks. Both buildings are of similar structure, a ground-level <br /> platform, and a lower-level pump room with concrete walls and jalousie windows. Four (4) <br /> abandoned sludge pumps, motors, piping and a hand crane system are located in the pump room <br /> of the sludge pump building. A sludge heater, two (2) heat exchangers, pumps and various piping, <br /> and a crane system are in the sludge control building. The sludge centrifuge building makai of the <br /> chlorine contact tank is a larger structure compared to the sludge pump and control buildings. It <br /> has concrete walls with sheet metal roof and sidings. The building is filled with abandoned <br /> motors, pipes, and sludge dewatering equipment. <br /> <br /> All machines, equipment and pipelines inside the buildings will be dismantled and removed in <br /> preparation for the buildings being refurbished, including repair of the damaged walls of the <br /> sludge centrifuge building. The sludge pump building and sludge control building are planned to <br /> be refurbished as machinery rooms, and also for storage and shop use. A wet lab, approximately <br /> twenty feet by eighty-four feet (20' x 84'), is planned to be installed between the sludge pump <br /> building and the sludge control building. Another greenhouse for use as a shrimp hatchery, <br /> approximately thirty-two feet by eighty-four feet (32' x 84'), is planned to be added the makai <br /> side of the sludge control building. A fish hatchery will be installed in the sludge centrifuge <br /> building. <br /> <br /> Pump Station Building and Its Associated Structures <br /> <br /> The abandoned pump station next to the Pua Street Pump Station is a three-floor concrete <br /> structure, with two of the three levels below ground. The existing facilities inside include <br /> electrical panels, overhead cranes, ventilation fans, three (3) sewer pumps and seven (7) large <br /> valves. A wetwell with four (4) hatch covers is outside the building. Other miscellaneous <br /> underground structures near the pump station include two (2) emergency pumpout pits, and <br /> sewer manholes. The pumping station is on the land which will be retained for the Pua Street <br /> Pump station (Figure 4), and will be demolished along with the associated structures. Some <br /> portions of the below ground features may be retained for use to hold an odor control system for <br /> the Pua Street Pump station. <br /> Underground Storage Tank <br /> <br /> An abandoned underground storage tank (UST) is located near the entrance to the Sludge <br /> Control Building, at the mauka corner of the structure. This UST will be sampled to determine <br /> contents, emptied, cleaned and removed per DOH guidelines and requirements. If any of the tank <br /> contains have leaked into the ground, appropriate spill response actions will be taken. <br /> <br /> <br /> 5.2 Economic Characteristics <br /> <br /> The funds initially designated by COH for demolition and landscaping of the subject property will <br /> be used primarily for the demolition and removal of the unwanted components and structures, and <br />