§ 190-215 § 190-215
(6)
All temporary erosion and sediment control measures shall be
removed after final site stabilization. Trapped sediment and
other disturbed soil areas resulting from the removal of
temporary measures shall be permanently stabilized within
30 days.
I. Stormwater management measures.
(1)
(2)
(3)
(4)
J.
§ 190-215 § 190-215
(2)
(3)
(4)
(5)
[2] Drainage locations which serve 10 or more disturbed
acres at one time and where temporary sediment
basins or equivalent controls are not attainable,
smaller sediment basins and/or sediment traps should
be used. At a minimum, silt fence, vegetative buffer
strips, or equivalent sediment controls are required
for all downslope boundaries (and for those side slope
boundaries deemed appropriate as dictated by
individual site conditions).
§ 190-215
(o)
(p)
(q)
(r)
(s)
(t)
(u)
§ 190-215
Highlighted areas of poorly and very poorly drained soils.
Highlighted areas of poorly and/or very poorly drained
soils proposed to be filled.
Location, descriptions, details, and design criteria and
calculations for all structural, nonstructural, permanent,
and temporary erosion and sedimentation control
measures and BMPs.
Identification of all permanent control measures.
Identification of permanent snow storage areas.
§ 190-215 § 190-215
G. Redevelopment. Redevelopment of previously developed sites
must meet the stormwater management standards to the
maximum extent possible to be determined by the Planning
Board. The goal is to reduce impervious area by a minimum of
20% or meet the open space requirement in that zoning district.
The application shall include a certification by a registered
professional engineer as to compliance with this standard.
[Amended 6-26-2018 by Ord. No. O-18-015]
§ 190-215 § 190-215
(2)
(3)
(4)
(l) The service, repainting, and hull maintenance areas of
marinas.
The following measures are required in addition to BMPs
described in Subsection E(1) above, within areas with high
potential pollutant loads:
(a) Source reduction; and
(b) Pretreatment.
The following are prohibited within areas with high potential
pollutant loads located in a Conservation Zone:
(a) Infiltration trenches;
(b) Infiltration basins; or
(c) Dry wells.
§ 190-215 § 190-215
solids (TSS), floatables, greases, and oils after the site is
developed. This standard is met when:
(a) The Planning Board determines’ that _ suitable
nonstructural practices for source control and pollution
prevention are implemented;
(b) Stormwater management best management practices
(BMPs) capture the prescribed runoff volume; and
(c) Stormwater management BMPs are maintained as
designed.
§ 190-215 § 190-215
D.
(1) Stormwater management systems must be designed so that
the ten-year, twenty-four-hour postdevelopment peak
discharge rate does not exceed the ten-year, twenty-four-hour
predevelopment peak discharge rates.
§ 190-214 § 190-215
ARTICLE XXXI
Stormwater Management
Purpose: The purpose of this article is to protect, maintain and
enhance public health, safety, and general welfare by establishing
minimum requirements and procedures to control the adverse
impacts associated with stormwater runoff, and soil erosion and
sedimentation from site construction and development. Subdivision
and site plans shall include plans for managing stormwater and
controlling erosion and sedimentation as provided herein.
19
Appendix A
Nashua Revised Ordinances
Artic le XXXI-— Stormwater Management
Hic it Discharge Detection and Himination Plan 19
9 Progress Re porting
The progress and success of the IDDE program will be evaluated on an annual basis. The evaluation will
be documented in the annual report and will include the following indicators of program progress:
e Number of illicit discharges identified and removed
e Number and percent of total outfall catchments served by the MS4 evaluated using the
catchment investigation procedure
e Number of dry weather outfall inspections /screenings
e Number of wet weather outfall inspections/sampling events
