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ameO <br /> OVc = 0.75x2 f'c xb,, xd <br /> OVC = 0.75 x 2 (3200 psi) x 12in x (12in - 3in - 0.125in) = 9,037 lbs <br /> where: <br /> • f'c = in situ concrete value (28-day) <br /> • b,,, = width of concrete section analyzed <br /> • d = thickness of concrete-cover over rebar - value of a #4 rebar <br /> The capacity of the concrete is 9,037 Ibs, per foot of collar. This capacity does not include the <br /> additional capacity of the reinforcement in the concrete collar which would also resist the <br /> applied loading. Failure of the concrete due to shear is highly unlikely. <br /> Additionally, the Schedule 80 PVC pipe is sleeved in a steel casing penetrating the concrete <br /> collar which protects the PVC from potential damage from cracking or other degradation of the <br /> concrete collar. <br /> AMEC considers the 28-day UCS test results of concrete sampled from the concrete collars to <br /> be acceptable and will not affect the design intent. <br /> The Air Content for this concrete was not tested as it is not considered exposed concrete. ACI <br /> (ACI 201.2R-08) recommends air is added to concrete when it is exposed to freezing and <br /> thawing conditions to allow for a more durable concrete. The closure drain concrete will not be <br /> exposed to these conditions and was not exposed to freezing and thawing when it was placed. <br /> Please do not hesitate to contact me at 303-975-2192 or Andrea.Meduna @amec.com with any <br /> questions. <br /> Sincerely, <br /> AMEC Environment& Infrastructure, Inc. <br /> o Lr6,'P <br /> �?-Q 48325 <br /> Z-1 <br /> goes <br /> JONAL <br /> Andrea L. Meduna, PE <br /> Project Engineer <br /> Cc: Ms. Katie Holybee. Document Control, CC&V <br /> Ms. Meghan Duck, Document Control, CC&V <br /> Mr. Ron DiDonato, Project Superintendent,CC&V <br /> Mr.Scott Redabaugh, Project Superintendent, CC&V <br /> Mr.Jeff Gaul, Project Superintendent, CC&V <br /> Mr. Marc Tidquist, Sr. Environmental Coordinator, CC&V. <br /> Mr.Tim Burkhard, Project Resident,AMEC <br /> AMEC Environment&Infrastructure,Inc. <br /> 2000 South Colorado Boulevard <br /> Suite 2-1000 <br /> Denver,Colorado 80222 <br /> Tel: (303)935-6505 www.amec.com Page 2 <br />