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ar <br /> ,.,. `""`"� <br /> � ; <br /> , <br /> � � �.,t <br /> a�� �� � <br /> .r ,. , . <br /> ��� � _ <br /> ��� wi�s�&� <br /> ��� I PACiFIC ; ,��.= - <br /> ��� P.O.Box C-97304 f ' ` � <br /> Bellcvue,WA 98009-7730 ,V ,3 �!. J <br /> .n� O . �'�'�..i �' . <br /> �y . ��`. <br /> � � - ,L T � <br /> g� August 11, 1989 r.._;,_ .,,,,,,; u� . `�' <br /> �5��a 3-320-0102-72 ��` � <br /> � A�[ I <br /> � ._� 1 <br /> � ; ,��; . � �. �,�i� ., <br /> � � ���1\����� <br /> Mr. Gordon Witchcr � �'�N1 ` ,� ���U � <br /> City of Everctt AU G 1 ��� 1';3 <br /> Department of Public Works <br /> 3200 Cedar Strcct _.. I <br /> Evcrclt, Washington 098201 CITY Or EVE�._ �T <br /> Public Works Dept. � <br /> RE: NORPRO GRADING PERMIT REVISIONS I <br /> Dear Mc Witchcr: ( <br /> Wc arc responding to thc City's August 2, 1989 rcvicw commcnts. Plcasc 6nd your original <br /> .__� "mark-ups" attachcd. Your commcnts havc bccn addres.ecd on thc plan sct or within ihis lettcr. 'I <br /> I `'� 1. The design has Uecn rcviscd to incorporate your requircmcnt of 5- to 25-year d�sign n���- � <br /> � metcrs. ; <br /> �,! 2, Yes, thc elevalions which were sh�wn are no longcr corrccL As you probably arc awarc thc I <br /> ' �..� sitc plans have bccn rcviscd to climinatc soil cxport. li <br /> I <br /> � ; 3. Calculations oC the storage volume of the "north" fuwre trucking arca are cnclosed. � <br /> + �� ' 4. Hydraulic calculations oC the grass lined swalcs (bioliltcrs) are enclosed. Acwally, all primary i <br /> ' ilow lines (pipcd or open channcl) arc providcd. Thcsc were d�signcd using FIYDRA, � <br /> � computer progr:+m which I �nderstand you use. <br /> I � 5. Wc h�vc reduced thc storagc capacily oC the two trucking area parking lot retention/dctcntion <br /> ponds in order to minimize thcir starage depths. As you can sce from the calculation shcct, , <br /> �,� the pavcd trucking area capacity is approximately 1,ti90 cubic fcet (1,411 cubic Cect, rcquircd). <br /> �I ���� IGc depth will bc controlled by CB #5's overllcw gratc clevation of 586.00. The mvcimum <br /> dcpth at CB #4 will be 0.86 fcct (10 ir.chcs); thc triangular arca oC thc It/D storagc, having <br /> i a dcpth grcntcr than 6 inches, cxtcnds 9 fcct wcst anJ 72 Ccct north of CI3 #4. T'hc arca in <br /> 1_; qucxtion is on thc cast sidc of thc trucking nrca. It is out of thc way of trucks' docking <br /> �� movcmcnts. It is also out oC lhc way of lhrough and casual uaftic. , <br /> Thc fuwrc trucking arcn, which will havc a grass surGlcc until dcvclopcd, was dc•signcJ sim- <br /> ilndy. Whcn it is dcvclopcd, it will bc ncccssary to construct a sccond outfall into Narbcck <br /> Crcck so a suCGcicnt Icngth o[ grnssy swnlc can bc constructcd without inGinging on lhc <br /> NGPE — unlcss thc dcsign nccds and paramctcrs of thc si�c changc. It will have a R/D <br /> storagc volumc oC 1,170 cubic fcct (1,109 cuUic lcct, rcquircd). Its dcpth will bc controllcd <br /> (:0O JSd-3250 Far('-D6)J53--0094 Plnnning• Cngineering• Sun�eying•Landscape Dc�iz.n <br /> — I <br />