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i <br /> IMr. Jay Seeley <br /> � SeptemUer 14,2006 <br /> � Based on this descrip!ion;tl�e caslcrn ra��ine slope will bc classificd as an crosion hazard azca. <br /> � Landslirte Ha.-.m•d Arcu <br /> The City oP�verett dciines �� landslide I�arard area as follo�vs: <br /> I "Landslide hazard areas" mean: those �reas oi the city subj�c[ to a severc risk of landslide. "I�hcy include the <br /> following arcas: <br /> ( <br /> � I. .4ny area with a comb�nalion oC <br /> � a. Slopcs�Teatcr il�an ]>pereeni. <br /> ( U. lmpem�caUlc soils (typically silt and clay) freyuenily interbedded with graimlar sni]s (predominantly saud <br /> � and gravel). <br /> a Sprines, ground���ater seepage,or saturated soils. <br /> I2. .4ny area locatcd on a landslide fcature descriUed in suUsection (1) of this definition which has sLo�vn <br /> movemeut during tl�c I7olocene epocl� (from ten tl�ous:md years agu to il�e present) or wludi is underlavi by mass <br /> wastage debris of ihat epoch. <br /> I 3. Any area potentially unslable as a result of rapid streant incision, stream Uanl:erpsion,or undercuttivg Uy wave <br /> i action. <br /> IBased ou our sitc observations and thc documcntcd site geulo�ic conditious, tlie eastcrn raviue slope would Ue <br /> � cl:�ssitied as a laudslide liazard area. <br /> Discussim� and Reconuucndations <br /> ( "I'he refcrc��ced reporl conlains a Ulanket recom�ucudation ilia� all Uuildings Ue setUack at lcast�0 feet from tlie top <br /> ( ef t6c rlvine slope. Based on our on-site oUscrvations and our local experience, it is our opinion that no setback <br /> from thr. 25-foot Uuffcr sl�o��m from thc top of tl�c steeper eastern ravine slope to llie eastcm edge of the parking <br /> lot is needed. Thc parking lot Ih;it is locafed in il�c arca immediately �eest of the ravuie 'slope will Ue paved witt� <br /> � all surface runoff dimcted into a stor:nwatcr management system. Tl�is will direct surface runofF away from lhe <br /> steeper eastern slopc and mitigate erosion ]�azm•ils. It is our opinion tliat the proposed development will not <br /> dccrcase tl�e staUility of tlie steeper caslern slope. The proposcd stonmvnter managemcnt facilities will not <br /> � incrcase tlie potential for crusion along lhe steeper eastem�.lvine slope. <br /> Tlvs ]et(er has Ueen prepared lor tUe use of TOC and tl�cir autl�o�ized agents and is applicaUlc only lo t]ie TOC <br /> Sea�vay Ccntcr site. 'Cltis lettcr is bascd on a review of tlteir fcnccd report and our documented site observations. <br /> This lellcr lias Ucen preplred �vith a levcl of care ;u�d s�iil commonly exercised iu U�c loca' area. No odier <br /> wv�rantec is cxpresscd or implicd. <br /> Project No. T-5338 <br /> � Page I�'o. 3 <br />