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Home My WebLink AboutRE: retaining wall Jesse Struve From: Jesse Struve Sent: Wednesday, May 30, 2012 1:34 PM To: Christine Mattson Subject: 20120530 3300 Graham Hill Rd Christine, The applicant submitted approval plans from a registered engineer regarding the retaining wall. This is sufficient for closure of the permit. Jesse Struve, PE Director of Public Works/City Engineer City of Orono (952) 249-4661- Direct (952) 249-4616- Fax www.ci.orono.mn.us 1 � � , . o SCHIMNOWSK ! ENGIHEERS CRITERIUM-SCHIMNOWSKI ENGINEERS 161 DUNBAR WAY MAHTOMEDi,MN 55115 TEL 651779-7700 FAX 651779-7114 www.criterium-sch imnowski.com May 25,2012 Ann Murphy 3300 Graham Hill Road Long Lake, MN 55356 RE: Boulder Retaining Wall Evaluation 3300 Graham Hill Road Long Lake, Minnesota Project No. 12-0658 Deaz Ms. Murphy: This letter is being sent per your request regarding the existing boulder retaining walls at 3300 Graham Hill Road in Long Lake,Minnesota. This evaluarion is based on observations I made during a site visit on May 24,2012, and verbal statements made to me by the wall contractor,John Christoferson of Minnesota Green,regarding construction means and methods. The construction of the retaining walls appeazs to be structurally stable and in general conformance with boulder retaining wall indushy standazds. The walls were constructed with boulders of sufficient size and setback. Other details also appeazed to be followed correctly. The walls addressed in this letter are on the south side of the house in a 2-tiered wall configuration. The lower wall has a maximum exposed height of about 4.5 feet. The upper wall is approximately 4 to 5 feet behind the lower wall(face to face distance)and has a maximum exposed height of about 3 feet. Level slopes are present at the top and bottom of the walls. No other surcharge loads are present on the retaining walls. Some industry standard practice references used for this evaluation regarding installation,specifications, and details include: - Boulders shall be placed to avoid continuous joint planes in vertical or lateral directions. - Each boulder shall bear rocks below it with good flat-to-flat contact. - Install woven landscape fabric behind the boulders to limit soil migration through the wall face. This evaluation was performed using the design guidelines presented in the third edition of the"Design Manual for Segmental Retaining Walls"(DMSRVI�published by NCMA in 2009. Direct all surface LICENSED PROFESSiONAI ENGINEERS HOME&BUILDING INSPECTIONS STRUCTURALEVALUATIONS aSSOCIATION RESERVE/TRANSITION STUDIES RESI DENTIAUCOMMERCIAL RETAINING WALL DESIGN�EVALUATIONS � _ � 3300 Graham Hill Road,Long Lake,Minnesota May 25,2012 Page 2 of 2 drainage away from the retaining walls. If soil conditions,proposed layouts,or other design parameters vary from that assumed a revised analysis might be needed. Please call me if you have any questions or need more information. Thank you. Sincerely, Paul Schimnowski,PE CRITERIUM-SCHIMNOWSKI ENGINEERS TEL 651 779-7700 Christine Mattson From: Christine Mattson Sent: Tuesday, May 15, 2012 8:37 AM To: 'lakeidamurphy@yahoo.com' Subject: 3300 Graham Hill Rd / Bldg Permit#2010-00778 Hello, On May 11, 2012 we received an updated survey from Gronberg &Associates, Inc. The City Engineer approved the survey, but noted we did not receive a written statement assuming all future responsibility for the non-compliant retaining wall. Please forward your acknowledgement to us before Friday, May 25, 2012. Christine Mattson Planning Assistant City of Orono 2750 Kelly Parkway Orono MN 55356(physica/addressJ PO Box 66 Crystal Bay MN 55323-0066 (mailing addressJ � 952.249.4620 �5 952.249.4616 � cmattson@ci.orono.mn.us � www.ci.orono.mn.us Office Hours: Monday- Friday 8 am to 4:30 pm Summer Office Hours begin Monday, May 21,2012 Monday-Thursday: 7:30 am to 5 pm/ Friday 7:30 am to 11:30 am OUR OFFICE WILL BE CLOSED: Monday, May 28, 2012 (Memoria/Day) 1 Christine Mattson From: Christine Mattson Sent: Monday, April 16, 2012 10:13 AM To: 'lakeidamurphy@yahoo.com'; 'Mark Gronberg' Subject: FW: 20120412 3300 Graham Hill Rd Ann, Attached is our engineers comments below. If you have any additional questions, please don't hesitate to contact us. Christine Mattson Planning Assistant City of Orono 2750 Kelly Parkway Orono MN 55356 (physical addressJ PO Box 66 Crystal Bay MN 55323-0066 (mailing addressJ �i' 952.249.4620 8 952.249.4616 � cmattson@ci.orono.mn.us � www.ci.orono.mn.us Office Hours: Monday- Friday 8 am to 4:30 pm Summer Office Hours begin Monday, May 21,2012 Monday-Thursday: 7:30 am to 5 pm/ Friday 7:30 am to 11:30 am OUR OFF/CE W/LL BE CLOSED: Monday, May 28, 2012 (Memoria/DayJ From: Jesse Struve Sent: Thursday, April 12, 2012 4:05 PM To: Christine Mattson Subject: 20120412 3300 Graham Hill Rd Christine, To complete the as-built for 3300 Graham Hill Rd,we will need the as-built to include the storm sewer pipe and discharge location for the drainage structure in the north corner of the garage. The tiered retaining wall was not shown on the original house grading plan and was installed without engineered plans and specification which is in violation of City code. I am willing to waive the requirement of the resident submitting engineered plans and specifications for the wall, but the resident will need to provide the City with written acknowledgement they are aware of the violation and agree to assume all future responsibility for a non-compliant retaining wall. The residents should also disclose the wall is in non- compliance to any future potential buyers. Please contact me with any additional question or concerns. Jesse Struve, PE Director of Public Works/City Engineer i City of Orono ' ' (952) 249-4661 - Direct (952) 249-4616- Fax www.ci.orono.mn.us From: Jesse Struve Sent: Monday, March 19, 2012 12:44 PM To: Melanie Curtis Subject: 3300 Graham Hill Rd Melanie, I have reviewed the proposed as-built plan submitted for 3300 Graham Hill Rd and have the following comments regarding engineering matters: • On the South side of the house, there is a tiered retaining wall. The combined height of the tiers exceeds 4'. The property owner needs to have a licensed engineer approve the design of the walls, because tiered walls need to be separated by two times the height of the wall. • In the north corner of the garage next to the parking bay, there is a drainage catch basin in the grass. Where does this structure drain? The as-built drawing needs to show the location of the outlet of this structure. If you have any additional questions regarding the property, please contact me. Jesse Struve, PE Director of Pub�ic Works/City Engineer City of Orono (952) 249-4661 - Direct (952) 249-4616- Fax www.ci.orono.mn.us 2 Christine Mattson From: Jesse Struve Sent: Thursday, April 12, 2012 4:05 PM To: Christine Mattson Subject: 20120412 3300 Graham Hili Rd Christine, To complete the as-built for 3300 Graham Hill Rd,we will need the as-built to include the storm sewer pipe and discharge location for the drainage structure in the north corner of the garage. The tiered retaining wall was not shown on the original house grading plan and was installed without engineered plans and specification which is in violation of City code. I am willing to waive the requirement of the resident submitting engineered plans and specifications for the wall, but the resident will need to provide the City with written acknowledgement they are aware of the violation and agree to assume all future responsibility for a non-compliant retaining wall. The residents should also disclose the wall is in non- compliance to any future potential buyers. Please contact me with any additional question or concerns. Jesse Struve, PE Director of Public Works/City Engineer City of Orono (952) 249-4661 - Direct (952) 249-4616- Fax www.ci.orono.mn.us From: Jesse Struve Sent: Monday, March 19, 2012 12:44 PM To: Melanie Curtis Subject: 3300 Graham Hill Rd M ela nie, I have reviewed the proposed as-built plan submitted for 3300 Graham Hill Rd and have the following comments regarding engineering matters: • On the South side of the house, there is a tiered retaining wall. The combined height of the tiers exceeds 4'. The property owner needs to have a licensed engineer approve the design of the walls, because tiered walls need to be separated by two times the height of the wall. • In the north corner of the garage next to the parking bay, there is a drainage catch basin in the grass. Where does this structure drain? The as-built drawing needs to show the location of the outlet of this structure. If you have any additional questions regarding the property, please contact me. Jesse Struve, PE Director of Public Works/City Engineer City of Orono (952) 249-4661 - Direct (952) 249-4616- Fax www.ci.orono.mn.us 1