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. _ _._—lL-��V/ UN "L"^— '---__ ---__.'__—_- _—_--- _ — --_ —— <br /> E N G I N E E R I N G <br /> 3E333 E:�s1 Harbor Noad <br /> Langiey,VJA90260 _ , ., �-��;���; <br /> (360)331•3113(a) ;. �' `'i'.;�",..... .o;�-. �, �:_j� . <br /> (3ED)331-7UA(Q . . .��� � .� <br /> x-sound@whidbcy.coin t"..t.����:,'i.��: �.��!�. ..,t": •��.'� <br /> j� i.l�.l;i.li��:.' ;:�':._�1. �F'[\������_;� <br /> MTMURANDUM <br /> r��:'; � <br /> ��•p; E3ob and Kathy Gambill ----- --- <br /> �Onq: Gevff Tapert,P.G. � <br /> nnTr:: i�ian i ,,�,�;=.: 03/o_�{_� �-- — _ <br /> R�; 7O9 40th Pl.,Everett,�VA—Slope Restoration <br /> As you know, I visited the subject sitc this datc. Several wood retaining walls me curreutly <br /> located withiu the Native GrowUi Proteclion Eascmcnt(NGPG),along�+�ith a few keystone <br /> walls less thln four feet high intended for planters. The wood retaining walls include a <br /> Simpson Strap connected to a dead-man anchor bchind the rvall. These straps are located <br /> approximately I G" below tBe grade behind ihe wall. At the top of the slopc,there is a <br /> keystone wall that has expericnccd somc mino:setdemenL <br /> It is my undcrstanding that the City of Everett is requiring the removai of�s many structures <br /> within the NGPG�s feasible,underst�nding that to protect the sivpe,diere may need to he <br /> somc portions remaining. It is my profession�l opininn that rcmoval of the dead-man <br /> anchors �vill cause more hann thin good, poteutially undennining the keystone wall ahove. <br /> pruperly planted,the areas around Uiese walls will become overgrown with native vegetation. <br /> Provisions should be made for proper maintenancc of this vegetalion to endure long-term <br /> gro�vth and hencc bank stability. Preference for plants with an interlockin� root systcm <br /> should hc considered in the pinnting plan. <br /> 1 have .I�IBCIIC(I h4'O SICCICIICS IIl illl fll1CII1�I IO IIIlISCf.IIC Illy rccommendations. In general, I <br /> r�commend that the wood retainink structure be removcd to just ahove the dead-tnan str�ps <br /> and the importcd gravcl bchind this section be removed. In doing so,the wcight on th:, slvpe <br /> will bc rcduced and Ihe slope will be returne:? rw;:h closer to its original grade line. <br /> Pollowing the removal of tlicsc woodcn mcmbcr; ,rny ren2�iniug imported gravel sliould bc <br /> removed a��d repinced �vith nativc soil to allo�+� plant growth. This soil should be protected <br /> wilh a staked organic jute mesh to prevent eresion and allow for successful plant f;rowth. It <br /> is my understanding that a horticultur,�list will spccify the required native plant species. <br /> Wc hope Ihis information is sufficient fur yom'pi�rposes. Should you have any interest in <br /> this pruduct, please feel free to give mc a call at(360) 331-31 13. <br /> ���pF R£'y r <br /> Q' .� � -.S y 9c�' <br /> � � <br /> N 2 ry <br /> • I �W <br /> 3t6tt Ep ('Uv <br /> CI SI EA '� <br /> . ��5�.7�A�i�G\�`�}` �_` <br /> � <br />