Section 62.9670 - Identification of plan-negative declaration(a) Letter from the City of Philadelphia, Department of Public Health, submitted February 9, 2001, certifying that there are no existing commercial/industrial solid waste incineration units within the City of Philadelphia, Pennsylvania that are subject to 40 CFR part 60, subpart DDDD.(b) Letter from the City of Philadelphia, Department of Public Health, submitted March 4, 2015, as amended February 4, 2016, certifying that there are no existing commercial/industrial solid waste incineration units within the City of Philadelphia, Pennsylvania that are subject to 40 CFR part 60, subpart DDDD.82 FR 20278, 6/30/2017; 82 FR 20278, 5/1/2017