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HomeMy WebLinkAbout909 CENTRE AVE - SPECIAL INSPECTIONS - 9/22/2005Irerracon 301 N. Howes - P.O. Box 503 November 3, 2004 Fort Collins, Colorado 80521-0503 (970) 484-0359 Fax: (970) 484-0454 Columbine Health Systems 947 Worthington Circle Fort Collins, Colorado 80526 Attn: Mr. Roy Malaske Re: Construction Materials Compliance Summary The Winslow and Garages A - D Services Through October 29, 2004 S/E/C Worthington Circle & Centre Avenue RECEIVED Fort Collins, Colorado Terracon Project No. 20041066 Noy n 9 Dear Mr. Malaske: ORAwt),rn t f)A1 STRUCTION Soils/Earthwork At the request of Drahota personnel, we reviewed the results of the earthwork materials placed and monitored in the building foundation areas. Terracon provided the services on an "as requested" basis. Our services on the project site have included performing laboratory testing of the soils for suitability to the project specifications and the Geotechnical Engineering Report recommendations (Project No. 20035096; dated June 13, 2003) performed by Terracon. Terracon also performed in -place field density testing during the foundation backfill placement to check maximum density and moisture control. As recommended in the soils investigation, at least 3-feet of controlled fill material shall be placed below all footings. Based upon observations and laboratory testing, on -site or approved imported soils were suitable for placement during construction. Laboratory tests indicated backfill material observed by Terracon met the recommendations as outlined in the geotechnical report. The results of the field and laboratory testing were forwarded for review. In addition, the on -site superintendent and subcontractors were informed on a daily basis of the test results performed. Terracon performed 382 in -place density/compaction tests for the building foundation backfill during construction. The tests were performed on a as requested basis by Drahota. The tests at the locations performed, indicated that the compaction and water (moisture) content recommended in the geotechnical report recommendations were met at the time of testing, or upon performing retests. One exception was Test No. 168 (exterior foundation backfill at the southwest corner of the core at finish grade). Based upon the limited tests and observations performed, results indicate suitable materials and specified compaction at the locations tested. Our test results represent only the materials at the location and time of testing. Terracon did not direct nor control the fill placement and compaction at the site and does not assume responsibility for the placement, compaction or control of the fill materials. Areas of fill which are not representative of our testing may exist, particularly in common fill areas such as slopes or landscaped outside of proposed construction. The foundation type and specific design for Arizona ■ Arkansas ■ Colorado ■ Idaho ■ Illinois ■ Iowa ■ Kansas ■ Minnesota ■ Missouri ■ Montana Nebraska ■ Nevada ■ New Mexico ■ North Dakota ■ Oklahoma ■ Tennessee ■ Texas ■ Utah ■ Wisconsin ■ Wyoming Quality Engineering Since 1965 The Winslow 1rarracm Compliance Summary Project No. 20041066 Page 2 each structure will be recommended based on the particular characteristics of the soil type at foundation depth, and on the basis of further evaluations and observations prior to construction. Concrete The Portland cement concrete placed and tested on -site consisted of 35 tests for physical property and compressive strength tests for the foundation footings, walls and slab -on -grade. The reports indicate the specified minimum compressive strength requirements as reported by Drahota for the project have been achieved. Hot Mix Asphalt (HMA) Paving Three (3) samples of HMA were obtained for bitumen content and gradation to check conformance to the submitted mix design job mix formula for the paving. One of the three tests (Grading SG) reported the gradation outside the design job mix tolerances on two sizes on the coarse side of the range. In addition, 20 in -place density tests were performed to determine relative compaction. All tests performed, or upon re -testing were within the 92 - 96% project specified requirement. Subgrade stabilization was required prior to paving, but upon completion met the proof -roll criteria as performed and observed by Terracon, Lafarge and Drahota personnel. All test results are within typical construction tolerances for projects of similar size and scope and should meet the intended use and application. The pavement should be observed for any visual signs of distress and corrective action and/or timely scheduled maintenance implemented to maintain the desired pavement design lift. It is recommended that the applicable project engineer review the test reports for meeting the project criteria. Reinforcing Steel Terracon provided reinforcing steel placement observation in structural concrete placements as requested. The observations performed were observed to be in compliance per the provided plans and specifications for the project and have been formally reported to the client and designated parties. It is recommended that the project structural engineer review the test reports for acceptance as meeting the project criteria. Masonry One grout, one mortar and one masonry assemblage sample(s) were obtained for compressive strength testing. Test results have met or exceeded the required the reported minimum strength specified for the project. In addition, Terracon provided one site observation of construction practices and procedures and have formally reported the observation for review. It is recommended that the project structural engineer review the test reports for acceptance as meeting the project criteria. The Winslow Compliance Summary Project No. 20041066 Page 3 Foundation Terrxan Terracon provided observation of the foundation spread footing foundation(s) excavations as requested during construction. A summary of the observations and recommendations were provided in written reports upon completion. Per Terracon's geotechnical report and observations performed, spread footings that Terracon observed have been placed in general accordance with the plans and specifications and were placed on the anticipated bearing material identified in our geotechnical report. This report has been prepared for the exclusive use of providing test data and observations to document portions of the earthwork, concrete, masonry,, Hot Mix Asphalt, and foundation construction operations conducted for the proposed project. The opinions and conclusions presented have been derived in accordance with generally accepted geotechnical and material engineering practice. No other warranty expressed or implied is made. In the event that there are any changes in the nature or design of the project, the conclusions contained in this report shall not be considered valid unless this firm reviews such changes, and the conclusions of this report are modified or verified in writing. This letter is prepared for the exclusive use and reliance of our client. Use or reliance by any other party is prohibited without the written authorization of our client and Terracon. Reliance on this letter by the client and all authorized parties will be subject to the terms, conditions and limitations stated in the proposal, report and Terracon's Terms and Conditions. The limitation of liability defined in the Terms and Conditions is the aggregate limit of Terracon's liability to the client and all relying parties. It has been our pleasure to work with you on this project and to continue providing services during your ongoing construction. Should you have any questions, or need additional information, please contact us at your convenience. Respectfully submitted, Terracon Mike L. Walker, CET David A. Richer, P.E. Manager of Construction Services Geotechnical Engineer/Dept. Manager Enc/Copies to: (1) Addressee (1) Drahota (1) City of Fort Collins Building Dept. via Drahota (1) Vaught -Frye Architects MLW/DAR