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Home My WebLink AboutBoulder Retaining Wall Typical Section Im X 411 N ENGINEERS URONO �� CRITERIUM-SCHIMNOWSKI ENGINEERS 161 DUNBAR WAY MAHTOMEDI,MN 55115 TEL 651779-7700 FAX 651779-7114 www.criterium-schimnowski.com October 18, 2017 RECEIVED Aaron Lutz OCT 1 U ,201 Outdoor Excapes 2345 Daniels Street CITY OF ORONO Long Lake, MN 55356 RE: Boulder Retaining Wall Typical Section 500 Willow Drive South Orono, Minnesota Project No. 17-2989 Dear Mr. Lutz: This letter includes important details regarding the attached design for the boulder retaining wall typical engineered sections at the above location. This design is based on a Certificate of Survey prepared by Gronberg &Associates dated September 14, 2017, and a wall layout plan provided by you. The attached typical section(s) should be referenced for construction details. Special note should be made of the wall embedment depth and the geosynthetic fabric (geogrid) length as measured from the front face of the wall if applicable. If water is encountered at the base of the wall, additional drainage and reinforcement details may be required. 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 woven landscape fabric behind the stone to limit soil migration through the wall face. - Optional drainage stone shall consist of clean 3/4"to 1.5"crushed stone The design of the wall system is specific to the following parameters: • Location: Back of house at window well; 6-foot single wall with split to two 3-foot tiered walls • Minimum embedment depth = 6", or as noted • Soil conditions: Sandy Clay, friction angle = 30.0 degrees, unit weight of 120.0 Ib/ft3 • Allowable soil bearing capacity= 1,500 psf • Surcharge loads behind the walls: None • Slope at top: 10:1; Slope at bottom: 10:1 • Boulder sizes: see cross section drawing • Geosynthetic Reinforcement Fabric Type: None • Drainage pipe: Required LICENSED PROFESSIONAL ENGINEERS HOME&BUILDING INSPECTIONS STRUCTURAL EVALUATIONS ASSOCIATION RESERVE/TRANSITION STUDIES RESIDENTIAUCOMMERCIAL 5 RETAINING WALL DESIGN&EVALUATIONS z0l-7--00 500 Willow Drive South, Orono, Minnesota October 18, 2017 Page 2 of 4 These walls have not been designed for ground water surcharge loads. Direct all surface drainage away from the walls. 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. Please contact Criterium- Schimnowski to provide additional site assessment services if desired. 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. Additional information requested by Criterium-Schimnowski Engineers but not available includes: geotechnical site survey and soil data. 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. Sincerely, Paul Schimnowski, PE MN#40126 CRITERIUM-SCHIMNOWSKI ENGINEERS TEL 651 779-7700 500 Willow Drive South, Orono, Minnesota October 18, 2017 Page 3 of 4 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. 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. SUGGESTED QUALITY 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. I CRITERIUM-SCHIMNOWSKI ENGINEERS TEL 651 779-7700 500 Willow Drive South, Orono, Minnesota October 18, 2017 Page 4 of 4 TERMS AND CONDITIONS This WALL DESIGN and ensuing recommendations is expressly made subject to the following terms and conditions to which all persons that receive and rely thereon agree: 1. Standard of Service—Services performed by ENGINEER under this agreement shall be performed in a manner consistent with the skill and care ordinarily used by members of the engineering profession practicing under similar conditions at the time and in the locality the services are performed. • Client recognizes that interpretations and recommendations of ENGINEER are based solely on the information available to the company. • ENGINEER will be responsible for those interpretations and recommendations, but shall not be responsible for the interpretation by others of the information developed • Services provided reflect the professional judgment of ENGINEER,to the best of ENGINEER's knowledge, information,and belief as of the date hereof. • No other warranty or guarantee,express or implied, is made. 2. Said design is based entirely on and expressly limited by the scope of services ENGINEER has been employed by Client to perform and as described in WALL PROVISIONS and LIMITATIONS. 3. If the ENGINEER is hired for any construction phase services or site visits, it is understood that the Contractor, not the ENGINEER, is responsible for the construction of the project, and that ENGINEER is not responsible for the acts or omissions of any contractor,subcontractor or material supplier;for safety precautions, programs or enforcement; or for construction means, methods,techniques, sequences and procedures employed by the Contractor. 4. OWNERSHIP OF DOCUMENTS:All reports,field data,field notes,calculations,estimates and other documents ('reports')prepared by Engineer,as instruments of service, shall remain the property of Engineer. Client agrees that all reports furnished to Client or his agents,which are not paid for,will be returned upon demand and will not be used by Client for any purpose whatever. Engineer 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. 5.TERMINATION:This agreement may be terminated by either party by written notice. In the event of termination, ENGINEER shall be paid for services performed and expenses incurred up to the termination notice date. Neither Client not ENGINEER may delegate, assign, sublet or transfer his/her duties or interest in this Agreement without the written consent of the other party. 7. To the fullest extent permitted by law, Client and ENGINEER(1)waive against each other,and the other's employees,officers,directors, agents, insurers, partners,and consultants,any and all claims for or entitlement to special, incidental, indirect,or consequential damages arising out of, resulting from, or in any way related to this wall design and written report, (2)agree that ENGINEER's total liability to Client shall be limited to the total amount of compensation received by ENGINEER and (3)if an action is brought against the ENGINEER and the ENGINEER prevails, ENGINEER shall be entitled to recover costs and expenses, including reasonable attorneys'fees and costs. CRITERIUM-SCHIMNOWSKI ENGINEERS TEL 651 779-7700 wl-440V wel� vlqaxll� vm SOIL VALUES USED IN THE or Pro vlde DESIGN OF THIS PROJECT r� FRICTION ANGLE UNIT WEIGHT /OLd d TYPE OF SOIL (DEGREES) (Ib/ft-3) / REINFORCED BACKFILL 30 120 RETAINED BACKFILL 30 120 FOUNDATION SOIL 30 120 NUMBER OF BOULDER COURSES CROSS SECTION DESIGN BASED ON INFORMATION LISTED IN COVER WILL VARY AS NEEDED LETTER. 18 TO 23 DEGREE SCHEDULE OF REQUIRED SETBACK, TYP. rIMPERVIOUS FILL BOULDER SIZES 12' DEEP EXPOSED WALL BOULDER DEPTH, TOP BOULDERS, TYP. HEIGHT MIN, (12" TO 18" BOULDERS 4' 28' ALLOWED FOR FINAL GRADE ADJUSTMENTS) S' 32" 6' 36' MID—LEVEL BOULDERS, TYP. \\ \\� OPTIONAL 12" THICK DRAINAGE AGGREGATE SEE BOULDER SIZE SCHEDULE FOR MORE INFORMATION _ 6' MAX. I I I I BASE BOULDERS 2:1 MAXIMUM SLOPE — WALL BACKFILL COMPACTED 95% OF MAXIMUM STANDARD PROCTOR ALLOWABLE HEAVY WOVEN GEOTEXTILE DENSITY BOULDER i FILTER FABRIC DEPTH BEHINDI I BOULDERS WALL EMBEDMENT = 6' MIN. I— �L1jtlltiilirr�� UNDISTURBED ��—III—III—III- 4" DIA. DRAIN PIPE SOIL OUTLET 0 END OF WALL 3E OR 0 40' CENTERS MAX ENGIN AL ; Ez EER 4012E TYPICAL SECTION — 6' BOULDER RETAINING WALL (HEIGHT VARIES) CIF �''.' •----•_• 'Q�;a?�� SCALE: NONE "111111411110 Designed � Designed By; PROJECT NAME/ 500 WILL❑W DRIVE SOUTH / ORONO, MN Date; PDS LOCATION: 10/18/2017 Checked By: CLIENT: OUTDOOR EXCAPES Project No; PDS CRITERIUM-SCHIMNOWSKI ENGINEERS 2345 DANIELS STREET 17-2989 161 DUNBAR WAY PHONE:651.779.7700 Scale MAHTOMEDI,MN 55115 FAX:651.779.71 l4 LONG LAKE, MN 5535620 F6-FT awing Name: AS NOTED pschimno(r�criterium-schimnowski.com PHONE: 952-292-9772 BOULDER WALL SOIL VALUES USED IN THE DESIGN OF THIS PROJECT FRICTION ANGLE UNIT WEIGHT TYPE OF SOIL (DEGREES) (Ib/ft-3) SCHEDULE OF REQUIRED REINFORCED BACKFILL 30 120 BOULDER SIZES RETAINED BACKFILL 30 120 EXPOSED WALL BOULDER DEPTH, FOUNDATION SOIL 30 120 HEIGHT MIN. 4' 28' CROSS SECTION DESIGN BASED ON INFORMATION LISTED IN COVER 5' 32' LETTER. 6' 36' TOP BOULDERS, TYP. 7' 38• (12" TO 18" BOULDERS 8' 42• ALLOWED FOR FINAL GRADE ADJUSTMENTS) NUMBER OF BOULDER COURSES \/� WILL VARY AS NEEDED \� 18 TO 23 DEGREE BASE BOULDERS 3', MAX. SETBACK, TYP. TOP BOULDERS, TYP. i VARIES (12" TO 18" BOULDERS 0 WALL BACKFILL COMPACTED 95% ALLOWED FOR FINAL GRADE �� 1 r� 'A r vie, I OF MAXIMUM STANDARD PROCTOR ADJUSTMENTS) \ Ut/ 4 'V v/ f l DENSITY 12" THICK SELECT GRANULAR f( MID—LEVEL BOULDERS, TYP. \\� / SAND OR DRAINAGE AGGREGATE F / 1 4-41 ® //► (OPTIONAL) � / GEOSYNTHETIC REINFORCEMENT FABRIC / V'1 d-a 5', MAX. 2 LAYERS ® 5'-0" LONG MIRAFI 3XT OR Q IVALENT BASE BOULDERS >til I/ 5 b e 1•erm e yl a n 75/ Q -pl�e HEAVY WOVEN GEOTEXTILE BOULDER FILTER FABRIC DEPTH BEHIND BOULDERS WALL BACKFILL COMPACTED 95% OF MAXIMUM STANDARD PROCTOR WALL EMBEDMENT = 6' MIN. ( DENSITY all AL �77 UNDISTURBED , I III—III—III— 4" DIA. DRAIN PIPE ENGIINEER ' SOIL OUTLET ® END OF WALL 46126 OR ® 40' CENTERS MAX �j,••� TYPICAL SECTION - TIERED BOULDER RETAINING WALL (HT. VARIE ''�'�`' S) OF 4P,' SCALE: NONE ''J'�� Designed B 9 Y PROJECT NAME/ Date: PDS LOCATION: 500 WILLOW DRIVE SOUTH / ❑R❑N❑, MN 10/18/2017 Checkfd By: CLIENT: OUTDOOR EXCAPES Project No: PDS CRITERIUM-SCHIMNOWSKI ENGINEERS 2345 DANIELS STREET 17-2989 161 DUNBAR WAY PHONE:651.779.7700 Scale: MAHTOMEDI,MN 55115 FAX:651.779.7114 LONG LAKE, MN 5535620 Drawing Name: AS NOTED pschimno(uicriterium-schimnowski.com PHONE: 952-292-9772 TIERED BOULDER WALL