OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Parsons, Brinkerhoff, Quade & Douglas, Inc. July 15, 1987 AMTRAK Page 2
4. The New York Central Railroad plans also include a reference to a 6" C.I. house sewer emanating from the north side of West 33rd Street, which is connected to the existing 3'-0'' X 4'-9" sewer in West 33rd Street. The elevation of this connection must be determined since it is crucial to the design of the inverted siphon.
5. Since the existing sewer in West 34th Street is to be rerouted to the upstream end of the new siphon, the house connection elevations along West 34th Street must also be considered in relation to the hydraulic grade elevations along the siphon route. 6. Your attention should be drawn to the attached New York Central drawings in which it is shown that the existing 15" diameter pipe in 11th Avenue north of West 33rd Street enters the 33rd Street sewer at a point approximately 5 feet downstream of the existing manhole. This point is at the same location as your proposed manhole No. 3.
7. As a result of recent discussions it is understood that your .computations are being revised to reflect our comments regarding the apparent inadequacies in your computation of the hydraulic gradient difference between the upstream and downstream points of the siphon as shown in your January Sth submission.
All the above issues must be resolved satisfactorily before any hydraulic approval can be given for the submitted contract drawings. • Sincerely,
Magdi Farag, P.E. Chief Div. of Sewer Regulation & Control Bureau of Sewers Enclosure
NYC-WTC_000165356
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NYC-WTC_000165377
Letter from DEP Bureau of Sewers regarding unreviseed drawings and as-built records for the tunnel project.
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machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000165322
Department of Environmental Protection letter providing design review comments on tunnel project contract drawings, requesting pressure relief manhole details, existing sewer…
1 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.964
machine-extracted · confidence unavailable · Check page ↗5 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.964
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machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000165589
Letter from DEP to Port Authority regarding insufficient trench width and required pipe specifications for a rerouted sewer at the World Trade Center underpass.
1 shared topics · Same agency, volume and box · similarity 0.950
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NYC-WTC_000165289
Environmental Protection Department record related to tunnel project between W. 33rd and W. 38th Street.
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NYC-WTC_000165290
Letter enclosing a signed agreement between DEP and a contractor regarding sewer work in the vicinity of 11th Avenue.
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NYC-WTC_000165299
DEP legal correspondence regarding tunnel construction and sewer work in vicinity of 11th Avenue and W. 33rd Street.
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NYC-WTC_000165301
DEP approval of final contract plans for tunnel project from W. 33rd to W. 38th Street with construction specifications.
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Filed in the same folder