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� , . �. <br /> �I hereby oertity'tlsat this plan, apeoifi- <br /> aati aa, or repor�i�prepared by me o�. <br /> MwrGreen ; under�y direot <br /> MGSConSu/tiRgServJGeCorp a duly Register�8pr���io aI Engi eer <br /> 33S6800neCirNo undex the laws o= <br /> New HapQ, MN 55427 '�O 8�it�o i m"i:ute e a t a. , <br /> August 18,2015 � D$te � l r �' <br /> Reglstration No. ��� <br /> Melanie Curtis --• �•- _..�w��. <br /> Pianning and Zoning Coordinab�r � � <br /> City af Oro�v �, <br /> Crysta� Bay, ilrtn 55323 <br /> Regarding: M1/ respa�se m Bob Bea�'s S/1J15 comme� about the wb�erranean inberfodd�n��id system <br /> (Sub Grid)prvposcd finr the Douglas Sn�ith pr+Q�ct <br /> Ms.Curtis, <br /> Per my nesent phone oonye�with Bob Bean,I am adding the fiollowing dar�ficadon details to the layout <br /> d►awing fior th�s project <br /> 1} Virgin or natural day sw'!s must be used for maximum compaction and tin provide proper draina�e. This clay <br /> soii must co�ain less than 10 peroent ftne granular material. Properiy oompactied soil af this type is to <br /> reduoe wat�er retention. We can expec�t holdi�g faroes in the rar�g+e of 500 pounds per square foot agairtst <br /> the vertical metnbers of the grid if oompac;ted per this requiremer�t <br /> 2) The use of treafied 5 inch by fi jnch timbers are r�ecommended for this project Atka�ne CoPPer Quaternary <br /> (ACQ�treatied timbers are requMed. <br /> 3) The use of He�c-t�ead steel heayy duty nrood sc�ews rated for breatied (AO(1�timbers ar+e r+equired. Ten inch <br /> bng#12 ooarse thread or larger shauW be used. <br /> 4) Vertical posts must be set in plaoe in 4 fioaR or deeper virgin or naturat day. <br /> 5) qear medium aggre�ate odlectlom m�e is required on ev�ery layer of the grid. 4 inch drain tifes are r�equir�d <br /> at the botbom of each layec to illuminate hydraulic rratier pr�essure�,ainst the walls. Each file must be <br /> oonnected to vertical tiles tfiat I�d�o dte stwreline riP rap- <br /> 6) Double rows of siit fe�e rnu�t be us�d by the instaliation oonlractor prar to oorutnictlon wherever posslble. <br /> 7) Ber.ause of our ooncerns r+egarding erosion and sedimer�t oontrol witfiin ifie project area my <br /> reoommendation is tfiat m�ly�rienoed oorrtractiors with prrnren suoeessful i�tsta��alfo�s should be <br /> wnsidened fw hili s"ide r�horation5 aff this type. <br /> Sinoe�ely. <br /> ���GT.�/�,1'c.l�C'�, <br /> Max Gr+een PE MBA <br /> RECE�VED <br /> AUG i 9 20t5 <br /> c�n oF oRoNo <br />