§ 26-3. Inspections during construction.

(a) In general.

At a minimum, regular inspections must be made and documented, at the stages of construction specified in this section, for each environmental site design planning technique and practice and each structural and nonstructural stormwater management practice.

(b) Ponds.

For ponds:

(1) On completion of excavation to sub-foundation and, when required, installation of structural supports or reinforcement for structures, including:

(i) core trenches for structural embankments;

(ii) inlet and outlet structures, anti-seep collars or diaphragms, and watertight connectors on pipes; and

(iii) trenches for enclosed storm drainage facilities;

(2) during placement of structural fill or concrete and installation of piping and catch basins;

(3) during backfill of foundations and trenches;

(4) during embankment construction; and

(5) on completion of final grading and establishment of permanent stabilization.

(c) Wetlands.

For wetlands:

(1) at the stages specified in subsection (b) of this section for pond construction;

(2) during and after wetland reservoir area planting; and

(3) during the second growing season to verify a vegetation survival rate of at least 50%.

(d) Infiltration trenches.

For infiltration trenches:

(1) during excavation to subgrade;

(2) during placement and backfill of underdrain systems and observation wells;

(3) during placement of geotextiles and all filter media;

(4) during construction of appurtenant conveyance systems, such as diversion structures, pre-filters and filters, inlets, outlets, and flow distribution structures; and

(5) on completion of final grading and establishment of permanent stabilization.

(e) Infiltration basins.

For infiltration basins:

(1) at the stages specified in subsection (b) of this section for pond construction; and

(2) during placement and backfill of underdrain systems.

(f) Filtering systems.

For filtering systems:

(1) during excavation to subgrade;

(2) during placement and backfill of underdrain systems;

(3) during placement of geotextiles and all filter media;

(4) during construction of appurtenant conveyance systems, such as flow diversion structures, pre-filters and filters, inlets, outlets, orifices, and flow distribution structures; and

(5) on completion of final grading and establishment of permanent stabilization.

(g) Open channel systems.

For open channel systems:

(1) during excavation to subgrade;

(2) during placement and backfill of underdrain systems for dry swales;

(3) during installation of diaphragms, check dams, or weirs; and

(4) on completion of final grading and establishment of permanent stabilization.

(h) Environmental site design and nonstructural practices.

For environmental site design and nonstructural practices:

(1) on completion of final grading;

(2) on establishment of permanent stabilization; and

(3) before issuance of an occupancy permit under the Building Code and a use permit under the Zoning Code.