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r , <br /> PC Exhibit D ` <br /> Melanie Curtis <br /> From: David Bade [David.Bade@westwoodps.com] <br /> Sent: Tliursday, June 11, 2015 11:58 AM <br /> To: Melanie Curtis; robertbeQboltan-Menk.com <br /> Cc: 'Heidi Hedberg'(hhhedberg c@gmail.com); Steve Ryan (sryan�briggs.com} <br /> {sryan@briggs_com); chris.hedberg�carval.cQm <br /> Subject: RE: 3850 Watertown Road - Revised Plan 8 City Engineer Comments <br /> Attachments: Hedberg Grading Review-O6-11-15.pdfi Site Pic-06-40-15.docx <br /> Melanie/Robert: <br /> On behalf of the Hedberg's I have reviewed the Engineering Memo 9dated June9th,2015) and Wetland Wotice of <br /> Decision from the Watershed District and afi�er the following comments: <br /> 1. It appears that the wetland delineation was completed, but there is no reference to mitigation requirements for <br /> wetlands that have been filled as part of the grading opera#ions. (See Wetland Boundary Figure 5a} <br /> If this boundary was overlayed with the revised grading plan prepa�ed by Gronberg and Associates there <br /> appears to be a sizable area of potential mitigation needed due to filling on the east side. <br /> 2. I reviewed the revised grading plan and note that the g�ading has been improved on the south side of the <br /> property to provide a high w�ter relief/overflow to the south along the e:cisting drain tile line leading to <br /> Watertown Road ROW. <br /> While this is a significant improvement to the previous plan, f zm still concerned about the potential•�ooding of <br /> the Hedber� s property as shown on the attached sketch plan which shows the proposed changes in grading <br /> elevattons. <br /> The contours of 998, 1000 and 1002 have been expanded to the north which can provide some additional <br /> runoff storage, however the blue contour of 1000 and pink contour of 1002 continue to be shifted west with <br /> significant runoff storagz capacity being shifted to the Hedberg' s properiy. (I�does not appear from a cursory <br /> review that the additional grading cut to the north will provide the same amount of volume storage as the fil! <br /> added on the east.) <br /> The swale to Watertown �:oad will help, but in the event of flooding all the ponding will extend onto the <br /> Hedberg' s prope�ty up to the poinf at�Nhich it overtops the road at elevation 1a03 +/-. <br /> tn addition the grading activities appear to have opened up a groundwater seam in the north hill slc�pe which has <br /> added a fair amount o��s�anding water to�he existing lowland/wetland area(see a��ached photo provided b�r <br /> Chris Hedberg). <br /> This additional groundwater again reduces�he ponding/rfoodi�g caaacity of t�ie ar2a from��he pre-grading <br /> condition. <br /> Per my original memo dated 11/10/1�I befieve that additional grading ar►d drainage engineering analysis are <br /> warranted to protect the Hedberg' s properry from potential 7ooding. <br /> Thank you. <br /> Lia.��•:ci f�a.�c: E-".�=., ���i:r A.F' k?�:���r;; <br /> 91�:EC�O�C�O?EF.C'I10�'.S—CQ:�".!_✓iF-CI�L DEV�La�P;�!��f�!'i' <br /> David.Bade@westwoadps.com <br /> Direct (952)697-5724 <br /> Mafn (952)937-5150 <br /> ��'S�WQ+t�{� <br /> i <br />