500 LAUREL DR 2016-01-01 MF Import

Geotechnical Engineering Study Page 24 00-2267 Three Story Addition - 500 Laurel Street, Everett January 31, 2001 It is very important tfiat all building utilities are installed before the capillary break and visqueen bar�er are installed to avoid damaging therr. Damage to either elem�nt could result in a non-functioning system and that could lead to creation of the problems this system is designed Yo avoid. As an additional protective measure, the owner should also consider placing two to four inches of damp sand over the membrane. This will help protect the membrane during conatruction and will help in curing of th� concrete slab. It will also help to prevent cement paste bleeding down into the underlying capiilary break through joints or tears in the visqueen barrier. Retaininq Walls Although tliis proposed addition is to be built essentiaily "at grade" it is probable that portions of the western end will incorporate short fcundation stem walls that will ultimately be buried below the existing yard grade. It is impertant to racognize that any buried or "retainino' ;vall will need to be designed as a reinforced concrete retaining wa11 capable of supporting the loads imposed upon it. We recommend that the following geotechnical parameters be u�ed in the event that such a wall is ultimately includetl in the projec.t: ■ Rctive equivalent fluid weight acting or = 40 pcf wall capable of rotating more than 0.001 times tha free-standing wall height ■ Active equivaient fluid weight acYing on = 58 pcf wall fixed against rotation These lateral pressures assume a horizontal backfill and that no surcharges, such as hydrostatic or other loads, are imposed on the walls. If such surchanges are to exist, the loads should be added to the above parameters for design. In order to eliminate the potential for hydrostatic pressures to develop oehind any wall we recommend that the buried walls be provided with a suitable drainage control system. An appropriate wall drain system is discussed in more detail in the Site Drainage section of this report. l�J