5700 23RD DR W 2016-01-01 MF Import

1 ; ( 8.2 Seismically Ind � � T andclidec I i �"" Because of the pctential risk of seismically induced landslides occurring along the steep slopes I above Narbeck Creek, a Suilding setback limit from the top of the slope should be followed to reduce the risk of stmctural damage. This is further discussed in the Mitigadon Recommendations section of this report. � 83 Liquefaction ( The encountered stratigraphy has a low potential for liquefaction due to their dense state, gravei content and absence of adverse ground water conditions. I8.4 Ground Motion � Based on the site stracigraphy and visual reconnaissance of the site, it is our opinion that any I � earthquake damage to the proposed suuctures founded on a suitable Ixaring stratum, and following the enciosed setback limit recommendations, would be caused by the intensiry and acceleration Iassociated with the event and not any of the above discussed impacts. Seismic design pazameters are discussed in the Seismic Hazard Mitigadon section. i i I9.0 IlVIPACTS TO GRO WAT .R A IM -C � The ttuce types of ground water regimes identified pre��iously under the Hydrogeology secdon of this report i�luded the surficial interflow network, shallow ground water, and the dceper regional � outwash aquifer. In genera2, as the depth of an aquifer increases, the potendal impact from development decreases, although aquifer suscepdbility is also dependant upon tt�e natun of the overlying sediments. Fine-grained sediments such as lodgement till attemiate the pountial impacts I to underlying aquifers due to development. Further discussion on these pountial impacts are presented below. I9.1 Lncerflow Tmpa s Recharge to the interflow network couid be affected by rerouting of natural draimge and by ' covering of the laad surface by impervious surfaces such as pavement and buildings. The I principal wncern of disrupting the interflow network is rypically the pountial to discupt the I recharge to shallow wedands and underiying aquifers. However, on this site, no upland wedands were identified prior to our field study. Therefore, a roducrion of naaual recharge to the interflow network would have no impact relative to existing conditions. I9.2 Shallow Ground Water Im�acts I Recharge to the shallow perched ground water sysum could also be affected by covering the land . surface with impervious surfaces. The principal concem related to disrupting recharge to tlris , system would be related to potential reduction in discharge into either Narbeck Cmk or East Fork ! 10 �