Questions___Answers_AMD_0006_0006.pdf
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- Turnout Buildings
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This document is a Questions and Answers (Q&A) record from a Basis of Request (BOR) response addressing clarifications on contract drawings and specifications for a water infrastructure project involving turnout buildings and associated piping systems.
Question 28 addresses a discrepancy in flow control valve sizing at the Newcomb Turnout Site. Plan sheet 1695-D-62558 listed the valve as 8", but the BOR response clarifies that the correct size is 6" and that Drawing 1695-D-62558 will be revised. Question 29 clarifies that AWWA Class F flanges apply to all turnout buildings' steel manifold piping (drawings 1695-D-62558 through 1695-D-62568), except where Note 1 on drawing 1695-D-62551 specifies Class D flanges specific to BBN9 line pipe work only. Question 30 requests specification data for split sleeve restrained flexible couplings shown on plan sheet 1695-D-62548; the response indicates additional coupling data was added to Section 35 21 95 Steel Manifold Piping and reference corrections made to Section 33 11 12. Question 31 addresses whether buried gate valves require extension stems to within 6" of finished grade, similar to butterfly valves. The BOR response confirms that extension stems are required on buried gate valves per Detail 6 on drawing 1695-D-62568, and Specification 35 22 14 will be revised to clarify this requirement. Question 32 requests finished grade elevations for extension stem installation; the response directs contractors to reference grading plans for existing grade contours, noting that at BBN9 turnout specifically, the 6050 contour is the only existing contour in the vicinity per the survey.
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Text version
Question # Questions BOR Response
Plan sheet 1695-D-62558 calls Flow Control Valve at NEWCOMB Turnout Site as 8”, while Plan sheet 1695-D-62562 calls for 8”x6” Reducers in the Yard Pipe before and after the Bldg. this will require Reducers to return to 8” for the Valve. Where should these reducers be placed?
An error is on the mechanical piping coversheet (Drawing 1695-D-62558). In the Flow Control Valve Sizes table, the flow control valve size for the Newcomb Turnout is listed as 8". That's incorrect, the flow control valve should be 6".
Drawing 1695-D-62558 will be revised.
Plan sheet 1695-D-62558, general note #2 states “All Flanges shall be AWWA Class F as shown, unless otherwise noted.” A note appears on Plan sheet 1695-D-62551 that would allow Class D flanges at specific “Head Class”. But this reference doesn’t appear to refer to or govern the Steel Manifold Piping at the sites other than BBN9. Is that correct?
Will all Turnout Buildings will be CLASS F Flanges? If not Please provide the “Head Class” requirement for each Turnout Bldg.
Note 1 on drawing 1695-D-62551 is specific to the BBN9 line pipe work, see drawings 1695-D-62548 thru 1695-D- 62553. This note does not govern the steel manifold piping at any of the sites, whereas, General Note 2 on drawing 1695-D-62558 does. Steel manifold piping is shown on drawings 1695-D- 62558 through 1695-D-62568.
No Specification can be found that references the “Split sleeve Restrained Flexible Cplg” shown on Plan sheet 1695- D-62548. Please provide a Spec for these Couplings.
Added additional coupling data to 35 21 95 Steel Manifold Piping. Corrected reference in Revised 33 11 12 to refer to 35 21 12 - Steel Manifold Piping.
Spec 352214, 2.02, G, 9, d: requires Steel Extension Stems to within 6” of Finished Grade. This appears to be only applicable to buried Butterfly Valves.
There is NO mention of Extension Stems w/ GATE VALVES. Is that Correct? Will buried Gate Valves not have Extension Stems?
An extension stem is required on buried gate valves as well, refer to Detail 6 on drawing 1695-D-62568. The requirements of Specification 35 22 14, 2.02, G, 9 should also apply to buried gate valves. Specification 35 22 14 will be revised to clarify this.
Spec 352214, 2.02, G, 9, d: requires Steel Extension Stems to within 6” of Finished Grade. The only Finished Grade Elevation that could be found are in the Grading Plans and those are substantially away from the Valve locations. Please provide Finished Grade Elevations where Extension Stems are required.
Refer to the grading plans for existing grade contours. At BBN9 turnout specifically, the 6050 contour is the only existing contour in the vicinity of the BBN9 turnout per the survey.
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