Plymouth Township posted an updated environmental noise assessment for the proposed 2-million-square-foot data center at 900 Conshohocken Road on Wednesday, Aug. 26, less than a month before the next Zoning Hearing Board session.

The revised document and an accompanying letter, both dated Aug. 26, appeared on the township's official data center information page by Friday, Aug. 28. The township has not released a public summary of what changed from the original noise study, dated July 30, which developer Brian O'Neill of MLP Ventures submitted under the entity 900 Conshohocken Road LLC.

That original assessment drew scrutiny after MoreThanTheCurve reported Aug. 12 that it showed the data center footprint expanding to a second parcel. O'Neill's position was that the second parcel was included to show a possibility, not as part of the current plan. Whether the Aug. 26 revision addresses that issue is unknown.

The filing lands ahead of the next evidentiary hearing, set for 7 p.m. Thursday, Sept. 17, at the Karen B. Weiss Meeting Room inside the Plymouth Township Municipal Building, 700 Belvoir Road. The Zoning Hearing Board voted unanimously Aug. 17 to move proceedings from Colonial Middle School to the smaller municipal building room.

The hearing will be livestreamed. Public viewing will be available at the Greater Plymouth Community Center, 2910 Jolly Road, Plymouth Meeting.

O'Neill proposes converting 10 former steel mill buildings on the 66-acre site, a former Cleveland-Cliffs plate finishing facility along the Schuylkill River, into a data center with on-site natural gas-fired turbines and standby generators. A developer-commissioned report from 4Ward Planning projected $21.11 million a year in tax revenue, 5,000 construction jobs per year over three years, and 371 permanent data center positions, according to Philadelphia Inquirer reporting.

Plymouth Township Council formally opposed the special exception application in late July. Council Chairwoman Lynne Viscio said in a prepared public statement July 27 that "Our responsibility is not to oppose development. It is to ensure that if development is proposed, it occurs in a manner that protects our residents, our neighborhoods and the community we are all very proud to serve," as The Reporter covered.

Community organizer Ardis Lukens told Main Line Media News in August that roughly 9,000 people live within a square mile of the site.

The ZHB proceeding, which began June 25, is a quasi-judicial process. The board, chaired by Brian Daly with solicitor Dave Sander, has not announced a timeline for a final decision. A public comment session is expected at a larger venue at a date not yet set.