(a) A Type 1 sound level meter; or

(b) A Type 2 sound level meter; or

(c) A Type S sound level meter which has:

(1) an A-weighting frequency response; and

(2) a fast dynamic characteristic which complies with section 5.3 of ANSI S1.4--1971; and

(3) a relative response level tolerance consistent with that of either a Type 1 or Type 2 sound level meter, as specified in section 3.2 of ANSI S1.4--1971. g. "Equivalent sound level" means the energy-average of the integrated A-weighted sound level over a specified observation time T and is identified by the symbol Leg. 2. The authority shall undertake a rail rapid transit noise abatement study, incorporating a comprehensive review of the results of noise abatement studies and projects done for or by the Urban Mass Transportation Administration of the United States Department of Transportation and other mass transit systems. Such study shall evaluate the range of strategies available for meeting the sound levels set forth in the following sound level table, propose strategies and indicate the approximate time and necessary cost for meeting such sound levels, and indicate the expected dBA reduction of each proposed strategy. Such study shall be submitted to the governor and the legislature, and made available to the public, within one year of enactment of this section. SOUND LEVEL TABLE a. EQUIVALENT SOUND LEVEL PERCENT COMPLIANCE within 4 years within 8 years within 12 years of the of the of the effective date effective date effective date of this section of this section of this section I. CAR INTERIOR A. new cars 80dBA 100% 100% 100% B. old cars 85dBA 20% 40% 70% II. CURVE AND BRAKE SCREECH A. new cars No Screech 100% 100% 100% B. old cars No Screech 20% 60% 100% III. STATION TRAINS ENTERING, LEAVING OR PASSING THROUGH 105dBA 85% 90% 100% 90dBA 70% 80% 95% 85dBA 50% 60% 80% 80dBA 5% 15% 60% IV. ELEVATED STRUCTURES Sound level to be established 10% 30% 60% b. In all cases noise levels shall be measured so as to reflect accurately the worst case of noise exposure at a specific location where a noise abatement strategy has been implemented, to which a subway passenger, employee, or any person who is within range of subway noise could reasonably be exposed under normal operating conditions. Noise measurements shall be made under the following conditions: Car interior: when the car is in motion at a speed of forty miles per hour during normal operation with measurements in the center of the car and the microphone five feet above the floor. Station: (express) when the train is in motion and passing in front of the on-platform measuring point.

(local) when the train is in motion and any part of it is within the station. Car exterior (elevated tracks) when the train is in motion and is passing in front of the point from which noise measurements are being made. c. All measurements shall be taken with fast dynamic characteristic of the sound level measurement system. Energy equivalent measurements shall normally be used; provided, however, alternative measures may be proposed to incorporate new instrumentation or analyses that may become available. 3. Within six months of the completion of the study conducted pursuant to subdivision two of this section, the authority shall report to the governor and the legislature which strategies or portions of strategies proposed by such study it has chosen to implement, and the schedule for such implementation. To the extent, if any, that the authority's plan fails to meet the standards specified in the sound table, the authority shall so state and provide the reasons for its inability to meet such standards. 4. Within twelve months of the completion of the study conducted pursuant to subdivision two of this section, and at twelve month intervals thereafter, the authority shall submit to the governor and the legislature comprehensive reports detailing the authority's progress to date in abating subway noise. The report shall include, but not be limited to an itemized summary of all monies spent, bids requested and received, contracts let, and actual work done on noise abatement programs during the previous period. Any and all subway noise measurements made during the previous period shall be included, with, whenever possible, analyses of such measurements. Such report shall also include a detailed analysis of all noise abatement activities planned for the next twelve months. Following the first twelve month interval these reports shall also include comprehensive statements of progress made on all planned noise abatement activities included in the previous annual report. Nothing herein shall preclude such report from being incorporated in the authority's annual capital report submitted pursuant to the "capital financing and services system act of nineteen hundred eighty-one," so long as it is maintained as a separate, distinct and identifiable component in such report.