In summary, the test results suggest that the Hydrornill provides an effective dtemative to convertttond slurry wdlconstruction methods with regard to reducing the risk of bufldirtg damage due to ground-borne vibration from theexcavation prmess. However, the higher-tiquency characteristics of HydrorniU vibration may cause structure-bornenoise that may annoy building occupants in some cases. This effect is likely to be most pronounmd during millingin bedrock where there is a direct path from the bedrock to the building foundation, without intervening soil. milethere may be isolated complaints from the occupants of nearby buildings during HydromiH operations, the intrusionshould he of minimal duration, lasting ody a day or less. It should be cautioned however, that these conclusionsare based on measurements during the construction of a singe wdl panel of the depressed Central Artery, and maynot be representative of all locations. In particular, the Hydromill is likely to generate higher vibration levels atlocations where substantial obstructions are encountered during milting and where the bedrmk is Iwated closer tothe ground surface. Vibration monitoring during construction will be particularly important in such cases.
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