I am sorry, but the documents provided do not contain specific regulations for New York City regarding the number of fire extinguishers required on a major construction site. However, I can provide general guidance based on the documents:

• A fire extinguisher, rated not less than 2A, should be provided for each 3,000 square feet of protected building area, or a major fraction thereof [1]. The travel distance from any point in the protected area to the nearest fire extinguisher should not exceed 100 feet 2, 6.
• In multistory buildings, at least one fire extinguisher should be located adjacent to the stairway [2].
• A fire extinguisher, rated not less than 10B, should be provided within 50 feet of any location where more than 5 gallons of flammable or combustible liquids or 5 pounds of flammable gas are being used on the job site [2].
• One or more fire extinguishers, rated not less than 2A, should be provided on each floor [2].

It's important to consult local New York City fire safety regulations and building codes for specific requirements in your area. You may also want to consult with a fire safety professional to ensure full compliance.