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Home My WebLink About1C, Update on Erosion Correction Project E N HILLS. MEMORANDUM Item 1.0 DATE: September 21, 2009 TO: Mayor and City Council Ron Moorse, City Administrator FROM: Greg Hoag, Public Works Director SUBJECT: Update on erosion correction project on the Old City Hall Trail BACKGROUND In July of this year the City Council authorized an Engineering Services agreement with Bolton and Menk Inc. for survey and engineering services to correct an erosion issue on the property at 4504 Keithson Drive adjacent to the Old City Hall trail. Bolton and Menk Inc. completed a survey of the area the first week of August. On August 1 lth Public Works Director, Greg Hoag and Marcus Thomas, Bolton and Menk Inc. met onsite with the resident, Ron Nelson to discuss the results of the survey and to preliminarily discuss potential solutions for resolving the erosion issue. Marcus Thomas then took the information gathered from the meeting as well as the survey and came up with three possible approaches to eliminate the erosion problems on Mr. Nelson's property. Attachment A is a memorandum from Marcus Thomas explaining these approaches. While both options 2 and 3 can effectively resolve the drainage and erosion issue, Bolton and Menk Inc. is recommending to staff that option 2 be considered as it is a more cost effective option. On August 26th we again met onsite with Mr. Nelson to discuss these three possible solutions and the Engineer's recommendation to the City. Mr. Nelson has provided the City with a letter(Attachment B) dated September 14 stating his support for option 3. COUNCIL DIRECTION REQUESTED Staff and Bolton and Menk Inc. are seeking City Council discussion and direction on which option to continue forward in the design process for project completion to resolve the drainage and erosion issue. Marcus Thomas and Mr. Nelson will be present at the Work Session for questions and discussion. Attachment A August 27, 2009 Memorandum From Marcus Thomas, Bolton and Menk Inc. Consulting Engineers & Surveyors ` 12224 Nicollet Avenue a Burnsville,MN 55337 Phone(952)890-0509*Fax(952)890-8065 www.bolton-menk.com MEMORANDUM Date: August 27,2009 To: Greg Hoag,City of Arden Hills Public Works Director From: Marcus A.Thomas,P.E. Subject: Keithson Drive Trail Drainage On August 11, 2009,you and I met with Ron Nelson(4504 Keithson Drive)to discuss the drainage of the City's existing trail along Mr.Nelson's rear property lot line. This trail is located adjacent to and immediately east of the rear property line. At this meeting,Mr.Nelson discussed and showed us evidence of water coming off of the trail and eroding his lawn and mulch garden,both of which are located along a 4H:1 V(approx.)slope coming down from the trail. The trail sits approximately five to six feet higher than the average elevations of the rear property. The trail was constructed approximately thirteen years ago and is in fair condition. It exhibits signs of deterioration such as settling,heaving in the vicinity of tree roots,cracking,and edge degeneration. There is also evidence of previous crack sealing maintenance. The overall condition of the trail in this area is such that frequent and continued maintenance will be required to extend its useful service life. In the absence of continued maintenance, the trail could be expected to deteriorate to a poor and potentially unsafe condition within about five years. The purpose of our meeting was to review the problems associated with the existing drainage,as described above,and to discuss potential solutions to the problems. In general we discussed three possible approaches to eliminating the erosion problems on Mr.Nelson's property which are associated with the trail drainage. They include: 1. Construct a bituminous curb along the west side of the existing trail to prevent the trail from draining into the subject property. 2. Reconstruct the existing trail at new elevations and grades to prevent it from draining into the subject property. 3. Construct a tiered retaining wall system within the subject property and elevate the rear property grades such that the yard drains toward the trail as opposed to the trail draining toward the yard. Upon further consideration of option 1,we recommend against this approach. Given the deteriorating condition of the existing trail,it is not expected that a new bituminous curb constructed adjacent to the trail will stay in place and connected to the trail. More likely,the curb would separate and tip away from the trail, causing a hazard and increased maintenance needs. Option 2 would involve reconstructing about 150 feet of the trail in order to prevent it from draining onto the subject property. Currently the trail tips toward the property causing water to flow down the sloping back yard. If reconstructed,the trail could be tipped to the east,toward the flatter grades on the opposite side of the trail, and the water routed away from the subject property. This would also provide the City with a new trail segment in place of the aged existing trail. We estimate the cost of the trail DESIGNING FOR A BE7 ER TOMORROW Balton&Menk is an equal opportunity employer Mr. Greg Hoag,City of Arden Hills Page 2 reconstruction would be$15,000-$20,000. Option 3 would eliminate the existing slope within the subject property and replace it with stepped or tiered retaining walls and associated fill,all on private property. The objective of the walls would be to create finished grades that drain toward the trail,allowing the water to flow past the property as opposed to flowing into it. The total height of the walls would be approximately five to six feet high. There would be no significant improvements made to the trail under this option. We estimate the cost to construct the walls and associated fill would be approximately$25,000-$30,000. While both options 2 and 3 can be effective at correcting the drainage problems at 4504 Keithson, we would recommend that the City consider implementing option 2,as it is more cost effective and provides for the necessary rehabilitation of the trail in this area. If you have any questions regarding the three options we considered and their associated costs,please do not hesitate to contact me. We are prepared to assist the City in completing the design for whichever alternative you find most appropriate. Thank you for allowing Bolton&Menk,Inc.to assist you and the City of Arden Hills with this project. Attachment B September 14, 2009 Memorandum From Ronald and Ana Nelson, R esidents at 40 40 4504 Keithson Drive �. f �. �: .; �at� t�ernber 1� �� fio. r Hoa Df rc�en�I�lts Fob c � �� l� ' ate D��r�ctor c�c. den Hill �t o �n�11 r��r�bers .. .... . ... ..... ..... �'ro�n R.on anal Ana Nelson ��4 eithson II7�ie :�rd r��h 1s � 1'S S��.� , , J ect �ros�c�n�n bael� Ord .F�rst�f.all we would l ��to thank ire �a n:d theArden�I�11� �1t urn .. ...... . ..... Y � c� �e�nb�ers f or a raw�n �, 1 fin►to resol�r�e he ero �� p �n rob l ern 1n ��e rear of�u� r� d P u to water drama ,�frQm rie tra�1.'fie pare c�Y s ointe�d that 1t h as taken a roe. 2 �P� ears ... ........ . ... �I� Y to et �o er attento � F � non 1��a�tter but we::are tlafu� at we are n+�w mak�tn ass an �a efiu.l that he +�unc� w111 P decide to �nrn lenient a an car�re ro l en1 �s ear. p ct tl�e r � .za.�€v�re all a ee � ;t.the tra xl w r��t�onstr�.�� r� �rl . p �'�x� ra�X was construe e .� Y � d �" t goo chose to rear�f our ro er ..... ....... ........ ...and.the und.�e��e10 P � +�d�x�ld�d a�c�nt to tour rt� ert . . . , . ........ ..... wee s • h r +wwned�a th+� �.e� �n a .1 ,�n addition he rode: r ` . ............. m was..exace�rbated J... .. .'� deer n;the dr reotxon o� he rail of r��, 3 feet nlovYn �t even close PF � � r�o fur rear ro ert one to a�+�rd a ree that ±vas riot xem � � � Dyed at he time:: e Ixa�l vr�as installed . .fit. ... ....... . this o�nt�n the trail �b�e b lade►.:.:i s v��thzn ��nohes � ��Q rD a line. 'fie have 1Dst .. � ..... .:.. .:R,�: � ... ..... ....... .... ..:. .... .. P ..'. .. rc��, � 1 • Inc es of�a�Z on tour h�11 brut the �� ass would have been �1'I Gh �' �at�r bad I '. .. '. '. ��t �t a a x�c cDver on e p th la�.11 ct�vered h Y mulch�h�t has needed o be er�od�ea . . 11 re laced. Tay aid ,. ditYon the ed e o f tho b l ael�to trax �a begin hreak�:n and �±e�es of r .� l� ackt � haw�e been fal Yn dawn fide hill xnt�o�,r ro ert ��rr the 1t 2 e�ucs. The erosion� o , , s s bead hat your Iawn s Viler v�rater sn 1 � e rs r� D�uv ex o ed �adds the �-a . . �P' Y p � � tiDn it is�Dt xevel Yt t ps�ow�rds�our x� e� and the elevate �n o��he tra��dro s p p . s: �: �.. •:: •.:: ap�r��. Dm a. � o1nt ust n ,� +�r�ht o�our rn a to a low aunt ust snuth of our P � ' J ro +� one. �o he trail s� ed toward fur roe tie eleva p � '� on is on a do �� wn and lD easl as . 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