1230 MADRONA AVE 2016-01-01 MF Import

April 1 U, 2005 Proposed Singlc-Plmily Residencc L&A Job No. SA019 Page 7 shear slrength. Tlicse competent underlying soils have good resistance against slope failures. There it is unlikcly for deep-seaied landslides to occur on the site. Erosion Ilazard The surlici�l, loose topsoii, filL and weathered soils m�ntling the site can be eruded easily when stripped of vegetation cover. Shallow, skin-type, mudt]ows may occur in these weak surlicial soils if they arc ovcrly saturated. 7'o mitigate such erosion and nmdflow potential, tl�e veget�tion cover over thc site outsidc of the construction limits should be maintained. Concentrntcd stonnw�ter should not be disch�rged onto thc ground within the sitc. Spoil soils and yar<hvaslc should not Ue disposed of within Uie site. Storm runoff over impervious surf�ces, such as roofs or pavcmcnt, should bc captured with tmdcr�round drain linc systems tied to raof downspouts or by catch basins installed in thc pavemcnt, 1nd tightlined to dischnrge into a storm sewer. Unpaved, dislurbed ground �vithin tlte site sl�ould bc re-vegetnted to provide erosion protretion. Scismic llar:�rd The Vuget Sotmd region is in an active scismic zone. "Che site is generally underlain by densc to very-densc Older Sand of moderately-high sliear strength. 'I'hcre is a lack of a higli, extensivc, static grouncl�va(cr inUlc under ihe sile. "I'iic site is mostly gently sloped. 7'hc combination of thc ❑bove makes it rather unlikely for liquetaction or soil lateral spreading to occur on thc site during stroug carthquakes. 7�herefore, the scismic hazard should Ue minimal for the site. The building to be conslnicled on Ihe site, ho�vevcr, should bc designcd to withs�and seismic forces induced Uy strong carlhquakes. f3ased on the soil condilions encountered by the test borings, it is our opiniou that Scis�uic Usc Group I and Sitc Class D shoidd be used in thc seismic design of the rroposcct building in accordvue wilh the 2003 ]ntemational 13uilding Code (II3C) relerenced by tlie 2003 International Residential Code (IRC). LlU & ASSOCIAT�S, INC.