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identified by the DRMS. Representatives of the La Plata County Fire Department <br /> indicated that emergency vehicles would have no issues using the access road. <br /> • Week of July 4, 2014: Completed installation of guardrail. <br /> 3.0 Field Engineering and Quality Control <br /> The access road was constructed in general accordance with the plans and specifications <br /> prepared by Carrol & Lange Manhard. There were several changes to the roadway design due to <br /> conditions encountered during construction. The following sections describes the quality control <br /> activities conducted, presents the changes to design and specfications, and the reasons for the <br /> changes. <br /> 3.1 Culvert Headwall and Concrete Quality Control <br /> The only concrete headwall for the access road was located at approximately Station <br /> 19+25. Concrete for the headwall was poured on May 27, 2014. The Contractor retained <br /> Western Technologies, Inc (WTI) of Durango, Colorado for rebar inspection and concrete <br /> testing. After the rebar passed inspection, the concrete head wall was poured. <br /> Concrete testing results are included as Appendix A of this attachment. The results <br /> indicated a concrete compressive strength of 4,700 pounds per square inch (psi), which exceeds <br /> the specified design strength of 4,000 psi. <br /> Field conditions encountered resulted in the following changes: <br /> • Concrete thickness for the culvert wingwalls were not tapered from 12 inches to 10 <br /> inches; each wingwall was poured at a consistent thickness of 12 inches. This was <br /> done to improve wingwall stability. <br /> • The headwall concrete base was doubled in size to improve stability. <br /> • The concrete washout location shown on Figure C4.20 was not constructed because <br /> of the logistics of accessing the design location by the concrete trucks. A temporary <br /> concrete washout was placed on the south side of the access road at Station 24+00 for <br /> the construction of the headwall. Concrete wash was placed in an earthen pit. After <br /> the concrete hardened, the concrete was removed and disposed of as trash. The pit <br /> was refilled and the existing grade was restored. <br /> 3.2 Sedimentation Pond Inlet Structure <br /> The sedimentation pond inlet structure was constructed in general accordance with the <br /> design shown on Sheets C.6.90 and C6.93. <br /> Field conditions encountered and product availability resulted in the following changes: <br /> • The inlet structure was constructed using steel instead of concrete, due to availability. <br /> The steel structure was coated with tar. <br /> As-Built Technical Summary April 29,2014 <br /> New Access Road Page 2 <br />