At a minimum, regular inspections shall be made and documented
at the following specific stages of construction:
A. Ponds:
(1) Upon completion of excavation to subfoundation and, when required,
installation of structural supports or reinforcement for structures,
including but not limited to:
(a)
Core trenches for structural embankments;
(b)
Inlet and outlet structures, anti-seep collars or diaphragms,
and watertight connectors; and
(c)
Trenches for enclosed storm drainage facilities.
(2) During placement of structural fill, concrete, and installation of
piping and catch basins;
(3) During backfill of foundations and trenches;
(4) During embankment construction, and
(5) Upon completion of final grading, establishment of permanent stabilization.
B. Wetlands: at all stages specified for pond construction, during and
after wetlands reservoir planting, and during the second growing season
to verify a vegetation survival rate of at least 50%.
C. 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, prefilters and filters, inlets, outlets, and flow distribution
structures; and
(5) Upon completion of final grading and establishment of permanent stabilization.
D. Infiltration basins. At all stages specified for pond construction,
during placement of and backfill of under drainage system.
E. 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 diversion
structures, prefilters, and filters, inlets, outlets, and flow distribution
structures; and
(5) Upon completion of final grading and establishment of permanent stabilization.
F. 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) Upon completion of final grading and establishment of permanent stabilization.
G. ESD practices. At the stage of construction specified in the Design
Manual for each ESD planning technique and practice and at a minimum
upon completion of final grading, the establishment of permanent stabilization
and before issuance of use and occupancy approval.
Once construction is complete, "as-built" plan certification
shall be submitted by a professional engineer or professional land
surveyor licensed in the State of Maryland to ensure that ESD techniques,
treatment practices, and structural stormwater management practices
and conveyance systems comply with the specifications contained in
the approved plan. At a minimum, "as-built" certification shall include
a set of drawings comparing the approved plan with what was constructed.
Other information shall be submitted as required by the approving
authority.
Within 45 days of construction, the approving authority shall
submit a notice of construction completion to the Maryland Department
of the Environment on a form supplied by the Maryland Department of
the Environment for each structural stormwater management practice.
The type, number, total drainage area, and total impervious area treated
by all ESD techniques and practices shall be reported to the Maryland
Department of the Environment. A notice of construction completion
shall be sent to the Kent Soil and Water Conservation District when
BMPs requiring District approval are constructed.