500 LAUREL DR 2016-01-01 MF Import

Geotechnical Engineering Study 00-2267 Three Story Addition - 500 Laurel Street, Everett January 31, 2001 I Page 13 � ext�nds out from the northwestern comer of the garage (see Plate 2). It is important that this structure be removed in its entirety so that there are not concrete elements left in-place. Any such element could cause a"hard spoY' to deveiop and any new structure, eitf�er foundation or floor slab may then begin to "drape" over the hard spot. Uitimately this should be expected to result in distortion and even damage to the new structure. Stripping and Clearing: Afterthe completion ofthe demolition and removal ofthe retaining wall it will be necessary to strip and clear the remaining construction area of all remaining surface vegetation, topsoil, trees and stumps, debris, and other deleterious material that might detrimentally impact site excavation or foundation support. We estimate that an average stripping depfh of about four inches is likely to be required. The owner should alsa be aware that there are large areas of the property that were not subject to direct in-place exploration. As a consequence it is likely that greater thicknesses of unsuitable material may, and p�obably do, exist in some locations on the site. Because of this, we recommend that the owner pravide a contingency in the budget and schedule to accommodate the risk of additional stripping and removal of un�uitable surficial soils, tree stumps and deleterious materials, and their �lisposal. Stripped materials should ae removed from the site and disposed in accordance with the applicable local regulations. If adequate space is available, any topsoil that is de�med suitable may be stockpiled for later reuse in landscaping, if desired. The stripped material should not be mixed with any materials to be used as structural fill. We also recommend that, as a precautionary measure, any stockpiled material be kept a minimum clistance of fifteen (15) feet from any open excavation and not less than twenty (20) feet from the crest of the westem bluff slope. It is also important to protect the stockpile against the elements with an impervious cover. We s�ggest the owner, and his contractor, consider the use of a sandbagged ur pegged-in-place visqueen for this purpose. It is also advisable to construct either a shallow swale, a low earthen berm, or an erosion "silt" fence around the perimeter of the stockpile. In this manner, it should be possible to T � I I �I � I 1 �� 1 � 1 � I