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iune 78,"10G <br />David and Judy King <br />L&A ]ob No. GA07G <br />Page 7 <br />Perm:uicnt fill to be placcd ovcr slopes steeper than 15% gradc should be retained sWcwrally. <br />Strucwral fill, if �equircd for sitc grading, should be placed on compacted and proof-rolled, <br />unyiclding, undisturlxd, firm, nativc, Gsperancc Sand and/or hurd Whidbcy fortnation soils, <br />following stripping of lhe surficial unsuitablc soiis. <br />GF.OLOGIC IIA7.AIillS ANU KEMEDIA'TION <br />LandsiiJe Ilazards <br />"Ihe northern lot is underlain by dcnse Gspcnnce SanJ and Whidbey formation soils at shallow <br />depth. These soils �ue of moJcratcly high to high shear strength. Therefore, the risk for deep• <br />scated slope failures cutting into thc underlying densc Bsperance SanJ and hnrd Whidbey <br />forniation deposits shouW be minimul. The surficial wcal:er soils mantling the stcep slopes <br />�vithin thc lot may slough of7' in the fomi of shallow, skin-typc, mudllows when •levoid of <br />��egetation covcr and overly saturated. 'I'o mitigate such hazard, the vegetation covct wi�t�in the <br />lot hcyond construction limits should not be disturbcd. Concentrated stormwatcr should rot be <br />disch�vgcd uncontrolled onto the ground within the site. Stormwater ovcr impervious surfaces, <br />such as roofs and drivcwa�•s, should be captumd and drained into a stortn sewer or a suitable <br />storniw:�tcr disposal tacility as rccommcnded in this rcport. <br />F.rosion IlazarJ <br />'I'hc surficial �vcnker soils manding the stcep slopes within thc lot can be crodcd e:uily. To <br />mitigate such crosion potcntial, thc vegetation covcr on thc slopes outside of conswction limits <br />should not bc disturbcd. Unpaved ground wi�hin the lot rcsultcd from consWction activities <br />should bc re-vcgetated as soon as possible. Concentrated stortnwater should not be relcased <br />imrontrolled onto the ground within the lot. Stortn runofT over impernous surfaccs, such as <br />roofs and drivc�aays, should Uc collectcd with undetground drain lines connected to roof <br />dow�nspouts and catch basins installed in the pavcd driveway. Water collccted by the <br />unJcrground dr.iinnge systems should be tightlined to discharged into u storm sewcr or n suitable <br />LIU & ASSOCIATES, I:NC. <br />�a� <br />