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ERICE-{ O. TILTZL .�1ND ASSOCIATES, INC. <br />Engineers and Consultants <br />, 18S?0 76th Avenue Wesl, Suile B Edmonds, WA 98026 <br />0236 <br />Mr. Rick Ncuman <br />l3abbit Ncwnan Constniction Company <br />P.O. [30� Sft IOdO <br />? 18 Wilkes Strect <br />Steilacoom. WA 9S38R <br />Subject: Site Developmcnt Plans for 1509 Mukilteu Lane <br />Dear Mr. Newnan: <br />425-771-6212 FAX 425-775- <br />Pcbruary 2Q 2006 <br />AtincheJ to this Icuer are �hc design dr.��cings for thc civil enginecr'nc ponion of yaur short plat. '1'he Jrawings <br />consist of G I, "1'cmpor.�ry I:rosion miJ Sediment Conlrol Plan and G2. GnJine/Dr.�inage Plan. l hc pl:ms represent <br />thc minimal constniciion necessarv tu subdivide ihe site and install Ihe ne�v dnina�c system in Ihc right-ol=��.�y. <br />Detniled consiruetion plans fi�r devclopmem of cach new loi will be providcd aRer subdivision of ihe propcny has <br />becn lin;dized. Consequcn�ly, the issucs addicssed in the city's Icucr ol'January 30, 2006 wili be adJresseJ in detail <br />��hen Ihc dcsign dnwings I'or dcvclopment of thc lols arc resubmiUcd. The ��olumc of cut and lill for ihc proposed <br />icmpor.iry conswclion cntnncc is 79 CY of cut and 8 Cl' of fill. <br />7'I�c capacily of �he bro esisting Jr,�inage pipes scrving the proposcd short plat was cvaluated. Thc lirst pipe nins <br />I'rom tbe ecisiing c:uch basin in thc right-of-way at thc nonh�cest corner of thc site, downsiream to thc acst e�isting <br />l'8�l'II L18510. �I I1C til`COI1lI j11�1C Nllti If0171 Illlti Sl'l'OIl(I l'�ICII I)85111 lll'I'Oti5 MUI�II�CO BItl(I. <br />As prcviously inJicatcd in our Icucr to thc ci�y datcd Pcbnian d, 2005, ihc cstimntcd runolT nics for lull <br />dcvelopment of ihc arca tribulary to the c:uch basin tha� Jischarges across Mukilteu 131vJ are 3? CPS I'or dic 25-ycar <br />stonn and d.5 CPS li,r Ihe I00-ycar stonn. Por anal�sis purpose. it was presumed �hat Ihere was no tail ��.�ter in the <br />downslrcam cnJ of thc pipc th.rt crosscs unJcr Mukihco Blvd. Since thc pipc drnps ovcr �hc bank at this point, such <br />an nssump�ion is valid. Ilackw:ucr wilhin d�c t��o rcaches of pipc �+:�s cnlculatcd accordingly. <br />In ordcr tu providc a conscrvalivic estimalc of �hc capacity of ilic t��o pipcs in yucsiion, all nmotiwas ruutcd throuch <br />L•oih pipcs cven tliough anly approximmcly fifty percen� of the calculatcd ratcs will occur in tlie first pipc ftam the <br />north��cst comcr of Uic sita A backwatcr analysis ��as perfonncd anJ thc rcsults of that analysis arc attached to Ihis <br />Icticc 'I'hc analysis indicatas that nonc of dic pipcs �vill result in ovcrllu�� I'rom thc rcspcc�ivc ca'ch basins. As <br />indicatcJ hy thc city, no dcicntion I'ar dcvclopmcnt of thc two ncw lots will tlicreforc hc requircd. <br />If �ou slwuld havc any yucstions, plcasc fecl frcc to contact us. <br />Vcry Iruly yours, <br />I:RICH O.'IIGI'T_G AND ASSOCIATfS, INC. <br />♦ <br />G.-,�' D <br />�tflC�l 0. � 101ZC, �.�:. <br />Prosidcnt <br />�� <br />y <br />�'� <br />