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IBARGH�►USEN �.r0l�1SULTIf�fa �NGIf�IEEFiv', INC. <br /> "Land Planning, Survey, and Design Specialists" <br /> �5n � � f <br /> � i i � �'' n <br /> September 24, 1985 (��j '`� �� li I f � I J <br /> S�P � G i985 <br /> _ �iT`/ OF E`:�ERETT <br /> Mr. Gordon Wftcher �, ,� ,; ,,, , <br /> City of Evorett ° �` ''"° ��F�• <br /> Public Ylorks Department <br /> 3200 CeGar Street <br /> Everett, WA 98201 <br /> RE: Revlsed GraGfng and Storm Dralnage Plans <br /> Our Job No. 169& <br /> Dear Gordon: <br /> This ls to fntorm you that a fleld change tias been mado <br /> for the above-referenced proJect concerning storm draifnage plpe. <br /> Apparently, the contractor ha7 ordered and Installed corrugated <br /> metal storm drainage pfpe f�stead of con a ete pipe a�; indicated on <br /> our grading and storm drafnage plan. Recause ot ti�o difference in <br /> �N� values of these tHo �types of pipe, a concern for the ablllty of <br /> the CMP pfpe to convey the desfgn flow ra-ie had arfs�3n. I have sfnce <br /> completed a calculatfon using CJ.iart 4 of the Bureau ��f Publfc Roads <br /> manual for headwater depth of CMP pipu culverts. Thts chart sho�rs <br /> lhat 1 .3 fEet of head wlll convey the requlred 3.3 C1=S through the <br /> of avallableUhead at Catch'Bastn �i$ the 1 .3 feet ne�ded is mintmalet <br /> and will not IrtQact the operatfon of the storm dralnage system. Therefore, <br /> If your department has no restrtctlons for the use of CMP plpe or <br /> this systen, we wlll authorize �:he replaceeentrovlded thatnallcmaterfals <br /> nfpe with the 12-Inch corrugated mf:tal plp , P <br /> and constructlon are per Cii�y of Everett standards. <br /> If you have any questions regarding this change, please <br /> call thls office. <br /> Sincerely. <br /> �a�,l �GLv�''v°L/�� <br /> Danfel K. Balmelll <br /> Engineer <br /> DKB/vsh <br /> c135.19 Harmon and Assoclates <br /> cc: Nr. Ron Gregory, <br /> Mr. Jim Bakke, James E. Bakke, Inc. <br /> btr. AI Page-Y, S�perintendent for EvereTt lial I ConsTruction <br /> 6625 South 190th, #102 • Kent,Wasnington 98032 • (206) 872-5522 <br />