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HomeMy WebLinkAbout4380 ZIEGLER RD - SPECIAL INSPECTIONS - 1/14/20140)303gto- January 14, 2014 Heath Construction 141 Racquette Drive Fort Collins, Colorado 80522 Attn: Mr. Steve Orecchio Senior Project Manager P: (970) 221-4195 E: steve@heathconstruction.com Re: Construction Materials Compliance Summary Avago Technologies Hydrogen Tank 4380 Ziegler Road Fort Collins, Colorado Terracon Project No. 20131045.0024 Dear Mr. Orecchio, Terracon Consultants, Inc. (Terracon) provided construction materials testing, observation, and inspection services for the Avago Technologies Hydrogen Tank project starting on August 8, 2013 through September 30, 2013. The purpose of this letter is to state to Heath Construction, the Owner, the Architect of Record, and the structural Engineer of Record that, to the best of our knowledge, the construction on the project referenced above has been completed in substantial conformance with the approved contract documents and with the provisions of the applicable building code. In the capacity of the Contractor's testing and inspection agency, Terracon issued periodic reports throughout the project, which detailed the on -site special inspection and testing. Terracon reported that the work requiring special inspection was, to the best of the inspector's knowledge, in general conformance with the approved plans, specifications, and applicable workmanship provisions of the code. Exceptions and outstanding discrepancies noted (if any) for the project are presented in each of the following items. This Conformance Letter confirms the content and conclusions of the periodic and final reports issued by Terracon. Our scope of services for this project included review of submittals for geogrid and aggregate base course as well as observation, testing, and inspections of earthwork, foundations, reinforcing steel, and concrete. Terracon has issued periodic reports throughout the duration of the construction summarizing the results of our testing, observation, and inspection services for this project. We recommend the project structural Engineer of Record review the observation and test reports for acceptance as meeting the project criteria including the outstanding discrepancies listed in each of the items listed below. Terracon Consultants, Inc. 1901 Sharp Point Drive, Suite C Fort Collins, Colorado 80525 P [9701484-0359 F [9701484-0454 www.terracon.com Construction Materials Compliance Summary ��� Avago Technologies Hydrogen Tank a Fort Collins, Colorado acon January 14, 2014 a Terracon Project No. 20131045.0024 Earthwork Our services for the project included laboratory testing of the soils for compliance with the project specifications and Geotechnical Engineering Report performed by Terracon (Project No. 20135019; dated June 20, 2013). As recommended in the Geotechnical Engineering Report, a single layer of geogrid placed below 30 inches of imported granular fill was placed below the hydrogen tank foundation. On -site or approved imported soils were suitable for placement during construction in select, designated areas as defined in the plans and specifications. Laboratory test results and our review of the material submittals indicated fill materials tested by Terracon were in general accordance with the recommendations presented in the project specifications and/or Geotechnical Engineering Report. Terracon also performed in -place field density compaction testing during placement of the fill to check percent compaction - water content and observed the placement of geogrid on a part- time basis. Terracon performed a total of twenty-nine (29) in -place field density tests (including 5 areas retested after recompaction) during placement of truck pad subgrade, hydrogen tank pad subgrade, shot -off pad subgrade, truck pad backfill, roadway subgrade, sewer line trench backfill, and hydrogen tank pad select fill. The test results were within and/or accepted as meeting the specified limits for percent compaction and percent water content. Our test results represent only the materials at the location and time of testing. Terracon did not direct or control the fill placement and compaction at the site. Areas of fill which are not representative of our testing and observations may exist, particularly in common fill areas such as landscaped areas (if any) outside of proposed construction. Foundations As requested, Terracon provided observation of the foundation system, including over - excavation and replacement with geogrid and imported granular fill during construction. Based on our observations performed, foundations were constructed in general accordance with the plans and specifications and were placed on the anticipated bearing material described in the Geotechnical Engineering Report. Reinforcing Steel As requested, Terracon observed reinforcing steel for this project. A total of four (4) observations for reinforcing steel were made for the hydrogen tank pad, piping trench, shut-off control pad, hydrogen tank tunnel walls, and the truck loading pad. Our observations indicated the reinforcing steel observed by Terracon was in general accordance with the provided plans and specifications for the project. Responsive © Resourceful o Reliable 2 Construction Materials Compliance Summary Avago Technologies Hydrogen Tank n fort Collins, Colorado January 14, 2014 ❑ Terracon Project No. 20131045.0024 Concrete We,performed a total of four (4). concrete tests during placement of portlandcement concrete for this project. Concrete testing consisted of testing' for fresh concrete physical properties and casting of concrete cylinder specimens for compressive strength testing. Testing was performed for concrete placed for the hydrogen tank pad, piping trench, shut-off control pad, hydrogen tank tunnel walls, and the truck loading pad. The test results indicated the concrete was within specifiedlimits for physical properties and compressive strength. Conclusion This report has been prepared for the exclusive use of providing test data and observations to document the earthwork, reinforcing steel, and concrete for the proposed project. The opinions and conclusions presented have been derived in accordance with generally accepted' materials engineering. practice: No other warranty, express, or implied, is made. It should be noted that our Itesting and observation services were performed on an as -requested basis, and only when requested by the above -listed client or their designated representative. We offer no opinion regarding materials not tested or observed by Terracon representatives. 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. This letter does not impact in any way the rights and obligations of third parties; including contractors and subcontractors who may have provided the construction materials and/or construction services tested or observed. 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, Sincerely, "�•-• :� Terracon Cons ulta ItK4:P'� Eric D. Bernhardt, P.E.C. Geotechnical Department alager Copies to: Addressee (via e-mail) ike . Walker; CET Quality Manager Responsive b rtesourceful e Reliable 3