|
�,�.i�i� �,rutechnical h:nginccring Datc 11?2-'_O10
<br /> h:nginecring\ Retaining Structur�w Pmiect:Uemrose r�widrnce
<br /> �� Censulting PrujectM1tanagement/lnspection �}302Crtsce»tAee,liverett
<br /> Ilusiness, Ina Pavement Design &Analysis file#: 10001-155
<br /> STRUCTURAL FILL:
<br /> tivuctural fill sho�dd mnsist of a 3 indi minus selc�ct,dean, granular soil �+�ith no more than 5"o fines (-H2O0} Suitable
<br /> structural fill should consist of material that meet5 one of the follo���ing specifications, 1tiSDOT' Section 9-03J0
<br /> A�;gregate for Gravel UZse, WSDC7C Section 9•03.1d(1) Gravel Borrow, WSDOT Section 9-03.1�1(2) SeleYt f3orro��,
<br /> 1VSUOT Section 9-03.9(3) Crushed Surfacing (Ilasa Course Sp��cs), 1�'SDOT Seclinn 9-039(3) Crushed Siufacing (I op
<br /> Course Specs),r�PWA Class A Pit Rm�,or AP���A dass 13 Pit Run. M1taterial that docs not meet one of the specificatinns
<br /> sl��tdd be submitted rvith sievc analysis resulls for appro��al prior to placement.
<br /> l'he fill should tx� placed in liFts nut to exce�vi 12 inches in loose thickness. L•ach laper of structural fill shnuld br
<br /> compacted ro a minimum densit�� of 95".n of the ma�imum dr�' densih� as determin�Yi by ��srn� a�5�sn,���» n-�s�%.
<br /> Pnr structural fill lxlo��� footings, the area of the compacicd backfill must ex[end outside the perimeter ol thr
<br /> foundatiun for a distance at least c��ual to the thickness of the fill lxhveen the botrom of the foundation and thr
<br /> widerlying soils. If it is elected to utilize a comp.utecl Uackfill for lhe support of foundations, the sub};raJr
<br /> preparalion and lhe placin�of the lhukfill should be monitomd by a yualificd enbrineer or his representative.
<br /> fhc usc of on-site soils as strucmral fill is not r��ommended. These materials rcyuire verv high moisture contents lor
<br /> cnmpaction and reyuire a lon};time tn dn out if natural moitihire contrnts are lnn high. This makes moisture rnntrnt,
<br /> lifl lhickness,and comp�uticc��Rort dilfii ult lo�nntrnl.
<br /> DISCUSSION:
<br /> Plaiemrnt of a post to nupp,�rt tho r�i,ting�1rcl.�c�'uIJ allu�c thc o�isting timbcr and soil rctainin};�•all lo Br rrmurc�l
<br /> an�l still support the dctk A retaining wall could th�n lx plued ��'ith facr of wall sume��here near the e�isting stairs.
<br /> Krrp lhe retainin�;«'all far enough from thc npposite ctlge of pavement to allo��• for a carpoi t post about 20(<t[from
<br /> the house 7'he contractor muld place.�post there and the opposite comer���hile supporting die existing deck
<br /> 1h��same kind of retaining�call for tha slope adjuent ro the stairs could Ue used belo���near the small shed nent to the
<br /> ioad. It��•ould only nmd to be 6 to 8 fcet high and e�Mnd from the shed to a little past the palm tree.'ihe home o���ners
<br /> �lo»t ��ant to kcep the palm tr��so i!�eon't lx in the way.That�eould create another parking space up b}' the hnusr.
<br /> ;\�Iditional placement of pile supporLs�could allrn•: for a(fuh�re)expansion of the deck/carEmrt to���ards tlie road.
<br /> ,;?•..••: The soils behind tlte timber reWining wall are soft tn
<br /> ,� � !9� - ' .,�, l � about 5 feet from face of existing ��all. Also, the e�isting
<br /> ��, >. . '�t'� � J', ' �' . fti;,i� rakery is not sufficient for a«�all of that height. There is
<br /> • .` F�v :�.
<br /> � �i no drainage lxhind it, the rocks are small. and it's just a
<br /> ` mattcr o(time and a fe�v large rain falls unnl it gets heav��
<br /> , - �;_ :v ,. .�.
<br /> �• anJ blo�vs out. A �call Uiat doesn't reyuire much
<br /> -„�y u`;, ~`' ' .�-- " � ' �cavation��•ould be prudent, like ecolo��,Ulha I31ock,or
<br /> � � ����r("�'� � �` . �t��ne Tcrra.Ultra blocls are�1000 Ibs,Slone Terza am hal(
<br /> .�p,.. r`�'�':�, = ; ��� !
<br /> ` xia � `::::�e.: . ;;i.�t and can be movecl r��ith smaller npiipment. Allan
<br /> � � � . .� .
<br /> .. ::.y .;'�y!? - " '�� . �',6�.k or Keystone ����ll ncrd geogrid and themfore a lot
<br /> - .. ,- -- . .
<br /> , r... a.*�t n���re excavation(RO"6 of the�rall hcight or so).
<br /> . - ; ; .�.;
<br /> � +�� - • , ..� iar�
<br /> '�1� �\� ? . : r. '��� 4 L
<br /> �..�'`�=' , � 'y'�. = •+� ; �'�'� I hr slope uphill of the house is highly vegetated �vith
<br /> . •`�"'�' �'1�� ''�4��;:•' 11l1t/tPIH t1�G !'1Ound cover and large c��ergr��n Meis. No tesNng or
<br /> s - 'je� recunnaissance �eas performcd on the slope, hmceve� the
<br /> � '�~ ' .Y.>�s' trec�appcarrd ln lx genrrallr straiF;ht.
<br /> - - -- -—---------- � Pa��10(i
<br /> -- I'lu�n,�: :� : . . �, `�"t � l .��t '�,•, :. . . -;In 1-m.nl: Ia.nr���i�unrn};�nrcrsunt F'
<br /> '� I'� I Itu� Ir�l .\nhurn l\.l. 9Fll�1
<br />
|