500 LAUREL DR 2016-01-01 MF Import

Geotechnical Engineering Study 00-2267 Three Story Addition - 500 Laurel Street, Everett January 31, 2001 � Page 9 � material is also considered capable of developing more than adequate soil bearing, particularly if the materials' condition is enhanced by carefui and controlled redensification. These shallo�v soils are also relatively settlemert resistant, again, particuiarly if they are c�refully and thoroughly redensified. The majority of the hard, finer grained, silty soil encountered at somewhat greater depth are also considered to be generally firm, competent and essentially unyielding in-place and capable of providing more than adequate load bearing capability. These soil typically incl�de more than forty (40) percent soil fines (sil! and clay sized particles passing the number200 mesh sieve). Because of the high fines content they are considered to be highly moisture sensitive . This means �� they are likely to become difficult, if not impossible, to work or compact when wet, and that they are likely to deteriorate rapidly under even light pedestrian �onstruction traffic. They are also considered to be of low permeability to impermeable. These silty sands and sandy to ciayey siits are capable of standing at near vertical to relatively steep inclinations for prolonged periods without undue detriment, as witnessed by the existing near vertical faces at the crest and toe of the bluff. The more granular of these sandy soils are also capable of transporting moisture and, as a result, can be subject to hydrostatic pressures that can, under the appropriate circumstances, "blow ouY' the slope face. [It is believed that this has occurred on the slope just to the southwest of the site in the recent past.] It is also important io recognize that if the soil surfaces forming Yhe westem slope are left exposed to the elements (unvegetated) they are subject to relatively rapid erosional damage. Groundwater We did not encounter any visible evidence of a well es�.�blished groundwater level in our exploratory boring. However, we did encounter what appears to be a moderate amount of groundwater seepage within a thin but dense silty sand stratum at a depth of about sixteen (16) feet below the existing site grade. Given the elevation of the property above Possession Sound, the nearest large body of water, it is our professional opinion that the local groundwater level is probably on the order of more than one hundred and twenty (120) feet below the existing site l�