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proxy for Newfields. Please see updated attached AMEC Foster Wheeler PE <br />stamped drawings. <br />b. Yeh $ Associates is a concrete and soils testing agency that AMEC Foster <br />Wheeler subcontracted to provide the complete range of QAIQC services. <br />2. Technical S e2 adons: NewFields Record of Construction Report, page 4, section <br />1.4 states FLSmidth's original 20173 spec>fications for the high grade mill were used. Note <br />these specifications pre -date the concentrate building design where the static and dynamic <br />loading on the concrete slab (i.e., cyclic loading and unloading of the 3,000 CY of <br />concentrate Pref. March 9, 2017 TR -89 request letter] and heavy equipment [i.e., frequent <br />back and Wh movement of a large front end loader filling up to 20 semi -trucks per day]) Is <br />different than the loading in the HGM. The design engineer (Samuel) for the concentrate <br />building issued specifications in their design drawings, specfcally for concrete strength. <br />Samuel's specification states 4500 psi concrete is required for exterior concrete (Appendix A, <br />Construction Drawings - Dwg. No. 40-647-202, paragraph 6.5.C, table) differing from <br />FLSmidth's 2013 specifications. Furthermore, the FLS specification for cast -in-place <br />concrete (Appendix B, Technical Specifications — Spec. No. SP -71024-C-300, page 3, <br />paragraph 3.5.2 includes the phrase ".. as specified on drawings." making Samuel's <br />specifications take precedence. Finally, an errant letter (Appendix J, Minimum Concrete <br />Strength Requirement Leifer) from AMEC (not the designated ceriffying engineer) states <br />`Samuels Engineering, have called -out a concrete compressive strength of 4000 psi. ", which 1 <br />have just pointed out as incorrect for exterior concrete. This letter also summarizes the <br />concrete strength testing failures of five samples which did not meet the 4500 psi strength <br />within 28 days, and three samples that did not meet the 4500 psi strength at 56 days. This <br />conflicting Information must be addressed to the Division's satisfaction prior to accepting this <br />certification report. <br />Response 2. Technical Specifications: The Concentrate Storage Building foundations <br />and all associated ancillary concrete were installed in accordance with the requirements <br />Identified on drawings 40-647-200 through 40-647-203. <br />Five samples did not meet 4500 psi strength at 28 days but all concrete met 4500 psi <br />strength at 56 days which satisfies the Samuel Engineering strength requirements. <br />