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c� crsizcd �� ctpond th�u would provide adequate treatment of runoff from a signifir,ant <br />amount of existing pa��ement ihat is not redeveloped as part of this ��roject. <br />I-he stormwater controi facilities :;hall meet City standards For design and conswction. <br />i'he otT-site tlow must be received and dischlrged in a way that does not adverscly .il�fcct <br />�hc 1'unction of the ponds for treaunent o1 tl.e stonmvatcr (rorn the Gvcrett Mall tiite. <br />Sediment removal is reyuired prior to discharge to the vegetated trcatment ccll of the <br />�vetpond. The current plans uppear to show the westerly ponJ functioning as the second, <br />vegetaied cell of a wetpond intended to mcet City slandards. Howe�er, thc off-sitc runofl <br />is sho�vn discharg�n� to this second cell. The amount ol' water and sedimen� associ��tcd <br />��;a, �n�� �rr-s�« noW would ovcrwheLn the small sccond cell and retiult in the buriai of <br />the wetland vegetation. <br />Maintenance access shall be provided io storm�vater control fucilities in accordance wi�h <br />City standards. On lhc current plans, maintenance access is shown to the second cell, but <br />not to the rrsL City standurds require maintenance access to the firs� cell, which <br />functions to providc primary scdimenl rcmu�al. <br />A gcotechnical cngincer must evaluatc thc dam on thc south tiide of the ���cstcrly delcnlion <br />pond 1br structural integriry and safery. This dam appears to have bcen constructed morc <br />�han 35 yea�s ago, and contains a 16-inr,h cast-iron w.der main th.0 is an imporiant <br />component ol the Cih�'s �vater distribution system. The geotcchnical engineer shedl m,ikc <br />mcommendations for su�uctural updates to the dam necessary io protect the wa�cr m.iin <br />and lo bring lh� dam into compliance with cu�rcnt dam zafety standards. Maini��n;mce oi <br />Iho dam is thc responsihilily of Ihc Lvcrclt Mall. <br />Thc pl�uis do nul appcar to show thc corrccl location of thc 16-inch watcr main in thr dam <br />urca, which, .iccording ta City infonnation. is much closer to Ihc north tiidc ol thc bcrm <br />than is currcntly sho�vn. This watcr main must hc localcd in Ihc ficld :uid shown in thc <br />rurrect locatiun on thc plans. <br />I�hc City ;vould xllow �hc usc of an SMI StonnFillcr instead ol or in ronjuncticn with a <br />�r�tpond. Addilion:�l critcria for thc usc of .i SlormPilicr n�uuld bc .�s follows: <br />I 1 �I'he Stc;rmPilter musl be preceded by a ��reUraunent ���el��ault/iank containin�� at <br />Icast 30�� o( thc 6-month, 2=F-hour storm nnwlf ��olumc from Ihc contrihutint. <br />dccclu�icd draina�zc arca. <br />-'1 I hc StarmFihcr nwst Ircat at Icast thc 6-monlh. '-4-hnur storm. <br />3) Thc StormPiltcr shall bc Jcsigncd using a m:tximum (low r:�tc ol 7.5 gpm ��cr <br />cartridge. Plows excceding �hc design Ilow shall he h��passed around the system. <br />bul should gencralh� pass Ihrough thc prclrcatmcnl ��ci��aul�/tank. <br />-1) Thc StormPiltcr mcdio shall tarzet dissol�cd pollutanls and nutricnts as �acll as <br />tol:il suspcndcd tialids. As morc cf�ccti��c mcdia bcromc a��ailablc in thc lultn�c, <br />�he Siornil�iller tih.ili be upgraded. Jtn'ing rouline caru'id��e replacement, to uulizc <br />ilic,� improval mcdia. <br />_ . �.,., i �;:,, <br />