DEP sewer chamber structural design comments, June 1984

NYC 9/11 Public Portal Document

cc: DiMartino Novotny 1 Smith Aggarwal L Vogel Oliveri Khan/Henneberger Suspense lune 11, 198A RA: Ip

Seelye Stevenson Value &. Knecht, Inc. ..Wf, Engineers and Planners 99 Park Avenue New York, NY 10016

RE: North Access Connection 10th”.- Avenue Tunnel Amtrak, Borough of Manhattan '' „ .

Dear Sir:

In reply to your submission of structural computations for the sewer chamber 1 with a letter dated May 29, 198A,.pl ease be advised of the following comments of this department:

1. The thickness of the roof slab for the proposed chamber, shall be 12" minimum. The value of fs used to compute, steel for roof slah, invert slab-and walls shall be 20 k.s.i. and not 24 k.s.i. I 2. The^ precast reinforced concrete slab can not be lifted by sewer _ maintenance people due to its present proposed size. The design' . of the slab shall be changed to provide a standard''removable ' slab with tiie cPirfiguration of the sewer chamber changed as marked in red on the plans. i

3. The invert slab should be checked for shear and bond- il ! 4, The invert slab has been again designed as a two way slab although our comment No. 3 (i) of our letter February 21, 1984 specifically pointed that all slabs shall be designed one way.

Please revise your structural computations in accordance with the above comments and submit three (3) sets of corrected computations and contract drawings for our review and approval.

Copy to: Very truly yours. Mr. Harry Kamamis, P.E., Director Mass Transit Coordination I I, NYC Dept, of Transportation 51 Chambers St., Rm. #423 FREDERICK NOVOTNY. P.E., CHIEF Div, of Sewer Regulation & i u0 New York, NY 10007 Control, Bureau of hewers

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NYC-WTC_000165786