RES 542 Draft 01 2022-2024 - Laserfiche WebLink

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f Construction Problems (Alternatives 2 &3) I. Site space constraints: The lid Place ROW is narrow at only 30 feet in width and at several points there are steep cut or fill embankments and existing driveways within it which will require careful location of meters to avoid the need for rock walls. The existing pavement is also narrow and crumbling and closure of one lane of traffic will most likely be required where trenching work is to occur. Access to existing driveways will need to be maintained so that residents can get in and out of their properties. It is very likely that the underlying subgrade consists of lava rock which may make trenching difficult. There are also private water service lines running beneath lid Place serving properties below the subdivision which will need to be avoided during construction. II. Hazardous trees: Several large,invasive trees have been identified within the ROW or just outside of it. The roots from these trees likely extend under the pavement of the existing roadway and would be severed during trenching operations. This root damage may be enough to destabilize the trees and cause a safety concern both during construction and on into the future. Tree removal will be recommended as part of the construction work for the project. III. Construction logistics: Staging of materials and equipment will be particularly challenging due to the narrow ROW width and the need to maintain access to all homes along lid Place during construction. A stockpile and storage area outside of the ROW will need to be identified and made available to the contractor performing the installation work. IV. Overhead utility lines& poles: Several utility poles within the ROW are likely to be close to the water main trench and may be destabilized during trenching activities. Temporary bracing or potentially pole replacement may be necessary during • construction. In addition,utility lines suspended from these poles are quite low in several areas and may need to be rerouted or relocated temporarily or permanently to allow excavation equipment and trucks to freely travel and work within the ROW without posing an electrical safety or service risk. V. Offsite drainage: A visual inspection of the lid Place ROW revealed an obvious stormwater runoff issue which occurs at a low point in the roadway,mauka of parcel 004 (see Figure 5c.1). Runoff from upslope collects at this point before crossing the roadway and continuing down into that parcel. Due to high seasonal rainfall,this drainage channel could pose a challenge during construction and a hazard to downstream property owners following project completion. It should be mitigated by installing a permanent drainage inlet and seepage pit to dispose of stormwater from upstream areas by ground infiltration. g. Sustainability Considerations I. Water and energy are closely linked in a water distribution system. Hawaii Island is home to some,of the world's deepest fresh water wells and lifting this ground water to a usable elevation comes with considerable energy cost. Every drop of water which leaks out of the local system is not only wasted water but also wasted energy. Improving the water service to the Ild Place subdivision through either Alternative 2 or 3 will help to alleviate these inefficiencies in the current system. II. Selecting Alternative 3 would result in the installation of wireless water meters by DWS. These meters can be read remotely, leading to faster and more efficient system 12