The URL can be used to link to this page

Home My WebLink AboutB10-0105 Additional Interior Slab on grade & Foundation RecomondationsKoechlein Consulting Engineers, Inc. August 10, 2010 Geotechnical and Materials Engineers 12364 W. Alameda Pkwy • Suite 115 • Lakewood, CO 80228 -2845 wwwwXCE- Denver.com LAKEWOOD GLAND JUNCTION (303) 989 -1223 (303) 989 -0204 FAX Adam Williams, LEER AP ARC Integrated Program Management, Inc. 011 Eagle Park Drive Eagle, Colorado 81631 -0156 Subject: Additional Interior Slab -on -grade Recommendations Proposed West Vail Fire Station 2399 North Frontage Road 'Nest Vail, Colorado Job No. 09 -033 ------ - - - - -- (970) -241 -7700 (970)-241 -7783 FAX As requested, we have reviewed our July 13 thru 21, 2010 daily field reports for the proposed West Vail Fire Station in Vail, Colorado. The purpose of this letter is to summarize our additional interior slab -on -grade recommendations for the proposed fire station. At the time of our initial observation, the soils observed at the interior slab -on -grade elevation consisted of a natural, red, brown, moist to very moist, soft to medium stiff, sandy, silty clay with scattered gravels and existing fill. The existing fill is characterized by a black, brown, moist to very moist, soft to medium stiff, sandy clay with organics. Structures constructed over uncontrolled fill will always have a risk of movement. The level of risk for structures constructed on uncontrolled fill will primarily depend on the type of fill, how long the fill has been in place, new loading conditions on the fill, whether the existing fill has been exposed to water, depth of uncontrolled fill, and how the fill was placed. At this site, the existing fill has been in place for some tune, the fill is moist to very moist and therefore has been exposed to water, and the loading on the fill will not significantly increase. Therefore, in our opinion, interior slabs -on -grade supported by 3 feet of properly moisture treated and compacted structural fill underlain by a geotextile will have a slightly moderate to moderate risk of movement. The geotextile must be placed on the existing fill or natural soft, moist soils prior to the placement of granular structural fill. The geotextile may consist of a Miraf HP570 or equivalent. The structural fill may consist of clean crushed rock, base course, or other granular soils. All structural fill must be placed and compacted as recommended in our geotechnical report titled "Geotechnical Report, Proposed West Vail Fire Station, 2399 North Frontage Road West, Vail, Colorado" dated August 6, 2009. We appreciate the opportunity to provide this service. If we can be of further assistance on this or any other geotechnical matter, please contact our office. X11,,, . KOECHLEIN CONSULTING ENGINEERS, INC. Katie Shaw Engineer 3 copies sent jDo U � 31822 w • j r Reviewed by: Scott B. Myers, P.E. Senior Engineer Town of Vail ()FFal�� COPY Transmittal Cover Sheet Detailed, Grouped by Each Transmittal Number West Vail Fire Station No. 3 Project # 0936 Tel: Fax Date: 8/17/2010 - - •- 111 Transmitted To Transmitted By Martin Haeberle Adam Williams Town of Vail ARC Integrated Program Management 75 South Frontage Road 1790 38th St., STE 105 Vail, CO 81657 Boulder, CO 80301 Tel: (970) 479 -2142 Fax: F Acknowledgement Required Package Transmitted For Delivered Via Tracking Number Hand Item # Qty Item Reference Description Notes Status 0001 1.00 8/5/10 Koechline Letter: Additional Footing Recommendations 0002 1.00 8/10/10 Koechline Letter: Additional Interior SoG Recommendations Cc: Company Name Contact Name Copies Notes Remarks Martin, Attached please find the two revisions to date to the Town of Vail Fire Station No. 3 Geotechnical Report from Koechlein Consulting Engineers, Inc. Please don't hesitate to contact me with any questions. Thank you. Adam Williams AUG 18 2010 TO WN O. V AIL signature Signed Date Prolog Manager Printed on: 8/17/2010 P_ToV Page 1 Koechlein Consulting Engineers, Inc. Geotechnical and Materials Engineers August 5, 2010 12364 W. Alameda Pkwy • Suite 115 • Lakewood, CO 80228 -2845 www.KCE Denver.com LAKEWOOD GRAND JUNCTION (303) 989 -1223 (303) 989 -0204 FAX (974) -241 --7700 (974 )- 241 -7783 FAX Adam Williams, LEED AP ARC Integrated Program Management, Inc. 011 Eagle Park Drive Eagle, Colorado 81631-015 Subject: Additional Foundation Recommendations Proposed West Vail Fire Station 2399 North Frontage Road West Vail, Colorado Job No. 09 - 033 As requested, we have reviewed our July 13, 2010 daily field reports for the proposed West Vail Fire Station in. Vail, Colorado. The purpose of this letter is to summarize our additional foundation recommendations for the proposed fire station. At the time of our observation, the soils observed in the foundation excavation consisted of a natural, red, brown, mo ist to very moist, soft to medium stiff, sandy, silty clay with scattered gravels. Due to the presence of soft, moist soils at the footing elevation, it is our opinion that the soils exposed in the base of the foundation excavation will need to be stabilized. We recommend removing a portion of the soft, moist soil from beneath footings and replacing them with a granular structural fill. The structural fill may consist of clean crushed rock, base course, or other granular soils. The amount of natural soils to be removed and replaced will be partially dependent upon the structural fill being used and should be determined in the field by performing a test section. If the natural soils cannot be stabilized by removing and replacing 18 inches of material, the use of a geotextile below the structural fill should be considered. The geotextile below the structural fill may consist of a Mirafi HP570 or equivalent. The structural fill should be placed and compacted in accordance with the recommendations presented in our geotechnical report, dated August 6, 2009. We appreciate the opportunity to provide this service. If we can be of further assistance on this or any other geoteclinieal matter, please contact our office. KOECONSULTING ENGINEERS, INC. low-- U *004 .••� ( a 4f •, j _ • r i 22 • !o Scott B. Myers, P.E. Senior Engineer ' ` °P "' ` Town of Vail .OFFIr. � COPY u - ��05