The order the City kept.

NYC-WTC_000165500 – NYC-WTC_000165501

August 14, 1984 DEP letter confirming plan review and noting coordination required for sewer modifications at the World Trade Center.

NYC-WTC_000165502 – NYC-WTC_000165505

June 29, 1984 letter from Port Authority transmitting final drawings and specifications for the WTC Dey Street escalator underpass to DEP.

NYC-WTC_000165506 – NYC-WTC_000165518

June 5, 1984 internal DEP memorandum forwarding a sewer maintenance report by E.A. Britton regarding the WTC Dey Street project.

NYC-WTC_000165519 – NYC-WTC_000165521

July 15, 1982 DEP letter accepting hydraulic drawings for the Dey Street underpass with specific comments on pipe placement.

NYC-WTC_000165522 – NYC-WTC_000165535

Technical diagrams and tables showing proportions of value when flowing full for sewer design calculations related to the WTC project.

NYC-WTC_000165536 – NYC-WTC_000165540

March 15, 1982 DEP letter providing engineering requirements for a telephone manhole load above the proposed 13-inch sewer line.

NYC-WTC_000165541 – NYC-WTC_000165543

Excerpt from DEP regulations listing prohibited substances and conditions for discharging into public sewers.

NYC-WTC_000165544 – NYC-WTC_000165549

July 28, 1983 DEP letter discussing comments on preliminary plans for the Church Street underpass and sewer support provisions.

NYC-WTC_000165550 – NYC-WTC_000165553

Fragment of a document bearing the seal of the State of New York Public Service Commission related to the WTC project.

NYC-WTC_000165554 – NYC-WTC_000165555

Routing envelope or correspondence header from Port Authority to Department of Environmental Protection regarding the WTC project.

NYC-WTC_000165558 – NYC-WTC_000165560

Partial technical drawing or specification document with unclear markings related to WTC underpass infrastructure design.

NYC-WTC_000165561 – NYC-WTC_000165569

Technical drawing or schematic fragment related to the World Trade Center Dey Street underpass infrastructure.

NYC-WTC_000165570

Administrative record or drawing reference for the World Trade Center Dey Street underpass project.

NYC-WTC_000165571 – NYC-WTC_000165575

Administrative record or drawing reference for the World Trade Center Dey Street underpass project.

NYC-WTC_000165576 – NYC-WTC_000165578

Inter-departmental memo from DEP Bureau of Sewers outlining required inspections for a sewer under the WTC escalator underpass.

NYC-WTC_000165579 – NYC-WTC_000165581

Internal DEP memo outlining a strategy to replace an existing sewer conflicting with the proposed escalator underpass.

NYC-WTC_000165582

Letter from DEP Bureau of Sewers to Port Authority requesting three sets of drawings for the World Trade Center underpass project.

NYC-WTC_000165583

Department letter to Port Authority requesting a status update on project plans submitted in January 1982 which had not yet been answered.

NYC-WTC_000165584 – NYC-WTC_000165586

Department letter providing specific engineering requirements for a telephone manhole load and sewer centerline location.

NYC-WTC_000165587 – NYC-WTC_000165588

Letter from Port Authority confirming revisions to drawings have been incorporated in response to previous DEP comments.

NYC-WTC_000165589 – NYC-WTC_000165590

Letter from DEP to Port Authority regarding insufficient trench width and required pipe specifications for a rerouted sewer at the World Trade Center underpass.

NYC-WTC_000165591

World Trade Center technical drawing or sketch fragment document.

NYC-WTC_000165592 – NYC-WTC_000165594

Letter from Port Authority to DEP submitting revised drawings and schedules for relocating sewer lines at the Church Street underpass.

NYC-WTC_000165595 – NYC-WTC_000165596

Handwritten technical notes and sketch annotations related to WTC Underpass sewer project construction planning.

NYC-WTC_000165597 – NYC-WTC_000165598

Letter from DEP to Port Authority requesting updated plans and specifying concrete encasement for a proposed ductile iron pipe under Church Street.

NYC-WTC_000165599 – NYC-WTC_000165608

Letter from Port Authority enclosing five copies of a revised utility relocation plan for the Dey Street underpass project.

NYC-WTC_000165609 – NYC-WTC_000165612

Sheet from Port Authority engineering computations regarding structural calculations for a World Trade Center structure or utility component.

NYC-WTC_000165613

Letter from Port Authority to DEP proposing a new sewer alignment north of the kiosk foundation for the Dey Street underpass.

NYC-WTC_000165614 – NYC-WTC_000165618

Sheet from Port Authority engineering computations regarding structural calculations for a World Trade Center structure or utility component.