COM 0865.001 1996-1998 - Laserfiche WebLink

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Draft Environmental Assessment June, 1998 Old Hilo Wastewater Treatment mt Page 3 Hawaii. In addition, a small parcel on the east side of the pumping station will be relinquished for transfer to the Department of Hawaiian Home Lands to add to their park located on that side of the site. The County will also retain existing easements and establish new easements for their sewer lines, drainage and access to the pumping station, as shown on Figure 4. This figure also shows a planned layout of the PACRC facilities on the abandoned treatment plant site. The proposed project will focus on equipment demolition and removal in preparation for converting the decommissioned wastewater treatment plant into a teaching and research facility for aquaculture and marine science. Buildings and treatment facilities at the site will be stripped of the old plant equipment and renovated for the Center's use. Unwanted structures will be demolished and removed, as described below. Future connections are planned to a HIG deep seawater well on the adjacent land parcel to the west to provide cold seawater. Two wells with their pumping facilities are also planned to be installed on site to provide cool seawater and freshwater for the Center. The tentative locations of the two wells are shown in Figure 4. In addition, approximately twenty-eight plastic tanks of 15-foot diameter will be installed at various locations throughout the subject property. Those tanks are purposed for culturing aquatic organisms, including fish, mollusks, crustaceans, and algae or seaweed. Each tank will be equipped with both freshwater and seawater piping systems. The structures proposed for removal or conversion as part of this project are. Administration Building The administration building will be kept and renovated. This building consists of a water quality laboratory, a rest room, a chemical storage room, an administration office, and a pump control- panel room. The building is in a moderately good condition. Small quantities of lab chemicals were left in the storage room. Asbestos containing materials may exist in the floor tiles of the control-panel room. Due to its generic nature, basic renovation will be needed for this building, including the removal of asbestos containing materials, chemicals and electrical control equipment, refurbishment of the administration office, the laboratory and the control-panel room for the Center's use. The restroom and storage room inside the building may accommodate the Center users in its present form, or with moderate modifications to satisfy the Center's requirements. Screen, grit and distribution chambers, and aerated channel The concrete screen, grit, and distribution chambers and the aerated channel were for wastewater preliminary treatment and conveyance to the succeeding treatment facilities (Figure 3). The screen, grit channel and other machinery will be removed. All chambers and the channel will demolished to a depth of at least 3 feet below ground level. It is planned to construct a greenhouse at this location, with aquaculture demonstration tanks proposed to be put both inside and outside the greenhouse.