September 2, 2016 Page 2
20160902 Ph IV ltr - FY2017.docx 3066.08
a Relocating the main landfill gas (LFG) conveyance header pipe from between the closed
Unlined Landfill and the active Lined Landfill to the north and west of the active Lined
Landfill area.
=» Modifying the Phase I and II landfill gas collection and control system (GCCS) so that
that it may be connected to the relocated main LFG conveyance header pipe.
=» Decommissioning 12 existing groundwater monitoring wells and replacing some or all
of these wells.
We further understand that as part of the Phase IV permit application, the City would like
to include the following modifications for Phases I and II:
=» Modify the components of the final cover system to reflect current materials and design
standards; and
= Increase the inclination of the final sideslopes.
Figure 1 illustrates the potential scope of the Phase IV expansion. Based on the conceptual
layout, Sanborn Head estimates that developing the approximately 27-acre Phase IV
footprint area could provide on the order of 2.6 million cubic yards of landfill capacity.
Facility Permitting
Developing the proposed Phase IV area would require a Type I-A solid waste facility permit
modification as the new area would both increase the approved design capacity and extend
the date of the permit. In addition to modifying the Solid Waste Permit, an Alteration of
Terrain (AoT) permit, which addresses stormwater runoff and management, would be
required as well as a modification of the Groundwater Management Permit (GMP) and the
facilities’ Title V air permit. Services required to revise the GMP and Title V air permit are
expected to be performed after FY2017.
Preparation of an application for a Type I-A permit modification, would involve the
following:
= Preparing for signature by the City, the Type I-A application form;
s Preparing notifications to abutters and other potentially affected entities in accordance
with Env-Sw 314.08 and 303.05;
a Preparing Notice of Filings to potentially affected agencies as needed in accordance
with Env-Sw 303.06 through 12;
= Preparing a Site Report in accordance with Env-Sw 314.10, which could include, but not
be limited to, the following:
a Ademonstration of the siting requirements;
o ©Adescription of the existing conditions;
o Tax, land use, natural resource, and other related maps;
o Astatement of the need for the proposed expansion;
SANBORN ||) HEAD
