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HomeMy WebLinkAbout2525 Dunwoody Avenue - Building Plans: ResidentialFebruary 9, 2024 Alex Koumoutsos Landscape Renovations 12515 40th Street South Afton, MN 55001 Submitted by email: akoumoutsos@landscaperenovations.com RE: Boulder Retaining Wall Typical Section Project Location: 2525 Dunwoody Avenue, Wayzata, Minnesota Project No. 24-7666 Dear Mr. Koumoutsos: This letter includes important details regarding the attached design for the typical engineered section of the boulder retaining walls at the above location. This design is based on wall layout information provided by you in an email dated January 30, 2024, including a Grading Plan prepared by Landscape Renovations dated January 30, 2024. The attached typical section(s) should be referenced for construction details. Special note should be made of the wall embedment depth. Refer to industry standard practice references for installation information, specifications, and details. - Boulders shall be placed to avoid continuous joint planes in vertical directions. - Each stone shall bear on two or more rocks below it with good flat-to-flat contact. - Compact any structural fill place behind the drainage zone to 95% standard proctor. - Install non-woven landscape fabric behind the stone to limit soil migration through the wall face. - Drainage stone shall consist of clean sand or 3/4” to 1.5” crushed stone. The design of the wall system is specific to the following parameters: Location: Replacement of the existing segmental retaining walls on the slope to the lake Maximum exposed height: Tiered walls as shown on Grading Plan; 12-foot total system height Minimum embedment depth = 6“, or as noted Soil conditions: Silty/clayey sand, friction angle = 30.0 degrees, unit weight of 120.0 lb/ft3 Required soil bearing capacity = 1500 psf Surcharge load behind the walls: None 3:1 slope at top and bottom of wall system and between wall tiers Boulder sizes: see cross section drawing Geosynthetic Reinforcement Fabric Type: Not required Drainage pipe: Required This wall system has not been designed for ground water surcharge loads. Direct all surface drainage away from the wall. Methods to do so include but are not limited to the following: drainage swale, site grading, retention ponds, etc. Details of water control are left to the wall contractor. Additional information requested by Criterium-Schimnowski Engineers but not available includes: geotechnical site survey and soil data. Please contact Criterium-Schimnowski to provide additional site assessment services if desired. 2525 Dunwoody Avenue, Wayzata, Minnesota February 9, 2024 Page | 2 The wall design was performed using the design guidelines presented in the third edition of the “Design Manual for Segmental Retaining Walls” (DMSRW) published by NCMA in 2009 and FHWA Rockery Design and Construction Guidelines. If soil conditions, proposed wall layouts, or any other design parameters vary from those stated above, contact me for a revised design. Please call me if you have any questions or need more information. Thank you. This design has been prepared in strict confidence with you as our client. Reliance upon our design by other parties is strictly prohibited. If you choose to share the design, you agree to indemnify, defend and hold harmless the Engineer from any third-party action. No reproduction or re-use is permitted without express written consent. Further, we will not release this design to anyone without your permission. Please call with any additional questions you may have. Thank you for the opportunity to be of assistance to you. Sincerely, Paul Schimnowski, P.E. MN #40126 This report is protected by copyright laws; all rights reserved. Reproduction and distribution of this report without written permission of the company is prohibited. © Criterium Engineers 2024. I hereby certify that this plan, specification, or report was prepared by me or under my direct supervision and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. Paul Schimnowski, P.E. Date: February 9, 2024 License #: 40126 (MN) 2525 Dunwoody Avenue, Wayzata, Minnesota February 9, 2024 Page | 3 Retaining Wall Completion Reports and Construction Inspections To: Retaining wall contractors and/or all clients utilizing our services for retaining wall engineering. From: Paul Schimnowski, PE Retaining Wall Engineer Criterium Schimnowski Engineers (CSE) Paul@CriteriumMN.com Date: April 1, 2021 To help contractors and other interested parties navigate the changes that many cities and jurisdictions are making regarding construction inspection requirements and final approval letters, we are making the following recommendations: 1. Request that the City Building Official complete the Required Inspections of Retaining Walls form, attached. 2. Notify your client of the potential for added cost depending on city/building official requirements. Contact our office or refer to our service agreement for current fees. 3. Contact Criterium Schimnowski Engineers to schedule any required inspections. Adequate lead time is required. Similar to typical City inspections, at least one week is recommended. We cannot guarantee immediate service. 4. Take daily construction progress photos for your records and for submittal to Criterium Schimnowski Engineers upon request. 5. Complete the Statement of Conformance for your records and for submittal to Criterium Schimnowski Engineers upon request. Form attached. If a Wall Completion Report (Post built Conformance Letter), is requested of CSE, we will require that you provide construction photos and Statement of Conformance. In addition, CSE will need to perform a site visit once final grading is completed. Without these three items, we are unable to comment on the construction/conformance of the wall. We are here to help as much as possible. These inspection requirements are not coming from us. Contact us if you have any questions. 2525 Dunwoody Avenue, Wayzata, Minnesota February 9, 2024 Page | 4 Statement of Conformance (for Retaining Wall Contractor) Project Name/Address: _____________________________________ _____________________________________ _____________________________________ Form to be submitted with all construction progress photos by the retaining wall contractor at time of wall completion. This form is required in order to request a wall completion letter from CSE: _____ Block type: _____________________________________________________________________ _____ Geogrid type: ___________________________________________________________________ _____ Description of site soils (i.e. sand, clay, loam): _________________________________________ _____ Leveling pad size and type of material: _______________________________________________ _____ Embedment depth (courses of block buried): _________________________________________ _____ Draintile type and diameter: _______________________________________________________ _____ Drainage aggregate type and layer thickness: _________________________________________ _____ Geogrid lengths and elevations: ____________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ Compaction methods used: _______________________________________________________ I hereby certify that, to the best of my knowledge, the work is in conformance with the approved plans and specifications, manufacturer recommendations and requirements, and/or the applicable workmanship provisions of the code. ______________________________________________ Date ____________________________ Signature of Person in Responsible Charge _____________________________________________________________________________________ Printed Name/Title/Company Submit completed form to: Melissa@CriteriumMN.com 2525 Dunwoody Avenue, Wayzata, Minnesota February 9, 2024 Page | 5 Required Inspections of Retaining Walls (for City Building Official) Project Name/Address: _____________________________________ _____________________________________ Permit Number: _____________________________________ Please choose one of the following: _____ 1. No inspections are required. _____ 2. The city will perform all needed inspections. _____ 3. The retaining wall engineer of record must complete the following: _____ Final site visit with wall completion letter.Contractor’s Statement of Conformance is accepted in lieu of periodic site visits during construction. _____ Periodic site visits with a wall completion letter that includes documentation of the engineer’s construction observations. Number of inspections required by building official: ________________ ______________________________________________ Signature of Building Official or Authorizing Personnel _____________________________________________________________________________________ Printed Name/Phone Number ________________________________ Date 2525 Dunwoody Avenue, Wayzata, Minnesota February 9, 2024 Page | 6 DESIGN PARAMETERS AND PROVISIONS DESIGN PROVISIONS: 1. REFER TO BOULDER RETAINING WALL INDUSTRY STANDARD SPECIFICATIONS AS THEY ARE INTEGRAL TO THIS PLAN 2. THE DESIGN OF THIS RETAINING WALL SYSTEM WAS BASED UPON THE EFFECTIVE STRENGTH PARAMETERS SHOWN ON THE “SOIL VALUES” TABLE. UNLESS OTHEWISE NOTED, NO FORMAL SOIL INFORMATION WAS PROVIDED BY THE OWNER OR OWNER’S REPRESENTATIVE. IF SOIL CONDITIONS VARY AT TIME OF CONSTRUCTION, WALL ENGINEER MUST BE CONTACTED TO DETERMINE IF A REVISED DESIGN IS NEEDED. 3. THE WALL DESIGN WAS BASED ON THE INFORMATION NOTED IN THE LETTER ABOVE. 4. REFER TO WALL CALCULATIONS FOR BEARING CAPACITY REQUIREMENTS. 5. NO PRODUCT/MATERIAL SUBSTITUTIONS WILL BE ALLOWED WITHOUT PRIOR WRITTEN PERMISSION OF CRITERIUM-SCHIMNOWSKI ENGINEERS. 6. FINAL SITE GRADES AND ROOF DRAINS SHALL DIRECT RUNOFF AWAY FROM ANY RETAINING WALL(S). UNLESS OTHERWISE NOTED, THE WALL(S) HAS NOT BEEN DESIGNED FOR HYDROSTATIC SURCHARGE LOADING. 7. THE WALL DESIGN WAS PERFORMED USING DESIGN GUIDELINES PRESENTED IN THE THIRD EDITION OF THE "DESIGN MANUAL FOR SEGMENTAL RETAINING WALLS" PUBLISHED BY NCMA AND FHWA ROCKERY DESIGN AND CONSTRUCTION GUIDELINES. DESIGN LIMITATIONS: 1. THE INFORMATION PROVIDED WITHIN THESE DOCUMENTS IS FOR THE STRUCTURAL DESIGN OF THE PROPOSED RETAINING WALL(S) ONLY. THE REQUIREMENTS FOR AND/OR WORK RELATED TO HANDRAILS, GUARDRAILS, OR OTHER LIFE/SAFETY ISSUES ARE EXCLUDED FROM THESE DOCUMENTS AND ARE TO BE PROVIDED BY OTHERS. 2. SITE LAYOUT AND GRADING DESIGN ARE NOT INCLUDED IN WALL DESIGN SERVICES. THOSE SERVICE ARE THE RESPONSIBILITY OF THE SITE CIVIL ENGINEER. 3. INTERNAL COMPOUND STABILITY (ICS) HAS BEEN CALCULATED FOR THIS PROJECT BY CRITERIUM. HOWEVER, ICS IS NOT A SUBSTITUTE FOR A GLOBAL STABILITY ANALYSIS WHICH SHOULD BE PERFORMED BY A QUALIFIED GEOTECHNICAL ENGINEER. ADDITIONAL SUBSURFACE EXPLORATION MAY BE REQUIRED. SUGGESTEDQUALITY ASSURANCE REQUIREMENTS: 1. A QUALIFIED ENGINEER OR TECHNICIAN SHALL SUPERVISE THE WALL CONSTRUCTION TO VERIFY SITE SOIL CONDITIONS. IF THE PROJECT GEOTECHNICAL ENGINEER DOES NOT PERFORM THIS WORK, A QUALIFIED GEOTECHNICAL ENGINEER/TECHNICIAN SHALL BE HIRED TO ASSURE THE RETAINING WALL IS CONSTRUCTED WITH PROPER SOIL PARAMETERS. 2. A QUALIFIED GEOTECHNICAL ENGINEER SHALL BE CONSULTED TO VERIFY THE SUITABILITY OF DESIGN ASSUMPTIONS MADE BY CRITERIUM. 3. WALL EXCAVATION AND SOILS SHALL BE INSPECTED FOR GROUNDWATER CONDITIONS. THE GEOTECHNICAL ENGINEER SHALL DETERMINE ADDITIONAL DRAINAGE PROVISIONS TO BE INCORORATED INTO THE WALL DESIGN. 4. THE WALL DESIGN ENGINEER SHALL BE HIRED TO PERFORM A PRE-CONSTRUCTION SITE VISIT. 5. THE WALL DESIGN ENGINEER CAN BE HIRED FOR CONSTRUCTION OBSERVATION SERVICES. 6. THE WALL CONTRACTOR IS RESPONSIBLE FOR MAINTAINING QUALITY CONTROL FOR THE CONSTRUCTION OF THE WALL IN ACCORDANCE WITH CONTRACT REQUIREMENTS. 7. SEE PROJECT CONTRACT DOCUMENTS FOR SPECIFIC DETAILS ON THE SCOPE OF WORK THAT WILL BE PROVIDED BY ALL PARTIES. 2525 Dunwoody Avenue, Wayzata, Minnesota February 9, 2024 Page | 7 STANDARD TERMS AND CONDITIONS SBN SERVICES, LLC d/b/a CRITERIUM - SCHIMNOWSKI ENGINEERS This design is expressly made subject to the following terms and conditions to which all persons that receive and rely thereon agree: Section 1: Standard of Service Criterium-Schimnowski Engineers (CSE) is dedicated to providing its clients with quality service. Services performed by CSE under this agreement will be conducted in a manner consistent with that level of care and skill that is ordinarily exercised by members of the profession currently practicing under similar conditions at the time the services are performed. No other warranty, express or implied, is made. Client recognizes that interpretations and recommendations of CSE are based solely on the information available to the company. CSE will be responsible for those data, interpretations and recommendations, but shall not be responsible for the interpretation by others of the information developed. Section 2: Charges Services are generally provided on a lump sum or an hourly basis plus necessary out-of-pocket costs. Where appropriate, company and personal vehicles used in conjunction with project work will be charged at the current IRS rate or other stated rate per mile. Vehicle rental or special vehicle requirements will be charged directly to the client. Out-of-pocket costs such as printing, word processing, reproduction, special consultant fees, permits, special equipment, extraordinary insurance, fares, telephone, overnight lodging or meals expense, and other similar project-related costs are billed at cost plus 10 percent. In the event that CSE shall be charged more than a nominal fee to obtain public information or documents of record from government offices and public agencies CSE may pass those costs along to you, our client, at cost plus 10 percent in addition to all other fees in our proposal. Section 3: Terms of Payment, Invoice Submittals CSE requires a retainer fee to be paid before commencing any project. Extended engagements may require interim invoicing on a weekly, monthly, or other basis. At the completion of the project, we will issue a final invoice. Retainer fee may be waived at CSE’s discretion. Payment of each invoice is due upon presentation of our report unless credit terms have been established and are included in our project agreement. Unless otherwise agreed to in writing, invoices issued to clients with established credit will be due upon receipt. Failure to pay invoices within the allotted time period will constitute a breach of contract and may result in suspension of work until such time as all overdue payments are made in full. Should any suspension occur because of overdue payments, the time for contract completion, if any is stated, shall be extended by the period of the suspension. All outstanding invoiced balances remaining unpaid for thirty (30) days after date of invoice will be charged a finance charge in the amount of 1½ percent per month from the date of invoice, with the annual percentage rate being 18 percent, computed on a monthly basis. In the event that any invoice remains unpaid and it becomes necessary, in the opinion of CSE, to initiate collection procedures, the client hereby agrees to pay all collection costs including, but not limited to, reasonable fees for attorneys retained by CSE and court costs at our standard billing rate for time necessitated in court appearances or presentation of claim to the appropriate court jurisdiction. Exceptions to the foregoing “Terms of Payment, Invoice Submittal” must be specified in writing as part of our confirmation letter or project agreement. Section 4: Insurance CSE represents and warrants that it is protected by Workers Compensation insurance and has such coverage under Public Liability and Property Damage insurance policies which CSE deems adequate. Certificates for all such policies of insurance shall be provided to the Client upon request in writing. CSE shall not be responsible for any loss, damage or liability arising from any acts by Client, its agents, staff and other consultants employed by it. Section 5: Limitation of Liability 5.a. To the fullest extent permitted by law, neither CSE, its consultants, nor their agents or employees shall be jointly, severally, or individually liable to client in excess of the compensation to be paid pursuant to this agreement, by reason of any claim, loss, costs, or damages whatsoever arising out of, resulting from or in any way related to this Project or Contract, including but not limited to breach of contract or negligence. 2525 Dunwoody Avenue, Wayzata, Minnesota February 9, 2024 Page | 8 5.b. CSE is not responsible for site conditions or the contractor’s performance of the work, including supervision and safety measures. 5.c. Mutual Waiver of Consequential Damages: In no event shall CSE or client be liable to each other for any indirect or consequential damages arising out of or relating to this Contract. Section 6: Indemnification CSE agrees to defend (subject to the provisions herein), indemnify, and hold harmless Client from and against any claims, liabilities, actions, demands, losses, damages, costs and expenses sustained by any person or entity to the extent caused by CSE’s negligent acts, errors or omissions in connection with the services performed hereunder. Except however, and notwithstanding any other terms in or applicable to this agreement, in regards to claims, liabilities, actions, demands, losses, damages, costs and expenses caused by the negligent acts, errors or omissions of CSE during the performance of professional services, it is expressly agreed that CSE’s duty to defend Client shall be limited to reimbursing Client’s reasonable costs, attorney fees and expenses incurred in its own defense to the extent of the claim caused by CSE. Client agrees to defend, indemnify, and hold harmless CSE from and against any claims, liabilities, actions, demands, losses, damages, costs and expenses sustained by any third-party not granted reliance on CSEs’ reports and services. Section 7: Ownership of Documents All reports, field data, field notes, calculations, estimates, and other documents prepared by Criterium Schimnowski Engineers, as instruments of service, shall remain the property of CSE. Our ownership includes all associated copyrights and the right of reuse, regardless of whether or not the Project is completed. CSE shall, upon receipt of full payment for services rendered, grant Client a limited, exclusive, revocable license to use the reports and other deliverables for the project specified (only). Any use other than on the named project is strictly prohibited. Any reuse or modification of the documents, without written verification, completion, or adaptation by CSE, as appropriate for the specific purpose, will be at Client’s sole risk and without liability or legal exposure to Criterium. Client agrees that all reports furnished to Client or his agents, which are not paid for, will be returned upon demand, and will not thereafter be used by Client for any purpose whatever. Client shall defend, indemnify, and hold harmless CSE from any and all claims arising from Client’s reuse, modification, or disclosure of the instruments of service or other work product produced hereunder to any third parties. CSE will retain all pertinent records relating to the services performed for a period of five years following submission of the report, during which period the records will be made available to Client at all reasonable times. Section 8: Copies of Document Subject to the terms in the preceding section, CSE agrees to furnish client with an electronic copy of our report, drawings, or documents relating to the services performed. Hard copies, bound or unbound, may be provided upon request at a charge of cost plus 10 percent at CSE’s sole discretion. CSE shall retain an electronic copy of the final report in its files for a period of five years. Section 9: Client Responsibilities Client agrees to provide all requested and relevant information in a timely manner. Failure to provide information within the agreed upon timeframe may delay the completion of the services within the agreed upon timeframe. It is not the responsibility of CSE to verify the accuracy or relevance of the information supplied. CSE is relying on the accuracy, completeness and appropriateness of client-provided information. CSE is performing the Services so that Client may utilize the information and recommendations contained in the reports, produced as instruments of service, which are not intended to be comprehensive, to effect prudent and timely decisions necessary for, among other things, the purchase, refinance, budgeting, planning, care, operation and maintenance of the property, as well as the safety of the occupants and other users. Unless clearly defined in the project’s scope, it is understood and agreed that CSE shall not be responsible for implementing the recommendations as part of its Services. CSE shall not be responsible or liable for Client’s determination to implement or not implement CSE’s recommendations, or for the services performed by any consultant(s) and/or contractor(s) whom Client may select to implement such recommendations. Further, it is understood that CSE is not responsible or liable, and Client shall hold CSE harmless, for any effects or hazardous conditions on the property, including the services or work performed by the consultant(s) and/or contractor(s) in the design and construction of the property. 2525 Dunwoody Avenue, Wayzata, Minnesota February 9, 2024 Page | 9 Section 10: Images Client hereby acknowledges and agrees that CSE and/or its agents may create or obtain images, photographs, and/or video and/or audio recordings of the Property during the Project, including inspection of the Property (collectively, “Images”). Client agrees that CSE may use such Images for CSE purposes, including but not limited to education, internal training, scholarship, research, marketing, advertisement, and promoting CSE’s website, products, services, or ideas. Section 11: Force Majeure The engineer shall not be responsible or liable for any failure or delay in the performance of its obligations under this contract arising out of or resulting from any cause or event beyond our control, such as war, strike, crime, epidemic/pandemic, regulations and/or restriction imposed by any government agency, or other event. Section 12: Termination and Assigns This agreement to perform engineering services may be terminated by either party by written notice. In the event of termination, CSE shall be paid for services performed and expenses incurred up to the termination notice date, plus any expenses or penalties resulting from the termination. Neither the Client nor CSE may delegate, assign, sublet or transfer his duties or interest in this agreement without the written consent of the other party. Section 13: Disputes If, in your opinion as our client, or that of any third party granted reliance on CSEs’ reports or services, CSE was negligent or in breach of contract, to the fullest extent permitted by law, any action arising out of or related to the services provided must be brought to our attention no later than one (1) year after our field visit. In the event this limiting period is not enforceable under the applicable jurisdiction, then the period shall be revised to reflect the shortest duration legally enforceable or, if no limiting period is enforceable, then this provision shall be stricken without voiding the remaining provisions of the Agreement. Any controversy or claim arising out of or relating to this agreement, or the breach thereof, shall be settled by arbitration in accordance with the Construction Industry Arbitration Rules of the American Arbitration Association, and judgment upon the award rendered by the arbitrator(s) may be entered in any court having jurisdiction thereof. In addition to and prior to arbitration, the parties agree to negotiate all disputes in good faith for a period of thirty (30) days from the date of bringing the concerns to our attention. If such negotiations do not resolve the concerns, the parties shall further endeavor to settle disputes by mediation in accordance with the Construction Industry Mediation Rules of the American Arbitration Association currently in effect unless the parties mutually agree otherwise. Demand for mediation shall be filed in writing with the other party to this Agreement and with the American Arbitration Association. In no event shall the demand for mediation be made after the date when institution or legal or equitable proceedings based on such claim, dispute or other matter in question would be barred by the applicable statute of limitations. If the Client brings an action against CSE and CSE prevails, CSE shall be entitled to recover costs and expenses, including reasonable attorneys' fees and costs.