Storm Water Pollution Prevention Plan Requirements
1. Site Description
A description of the nature of the construction activity.
A description of the intended sequence of major activities which disturb
soils for major portions of the site. (e.g. excavation, grading, utilities, and
Estimates of the total area of the site and the total area of the site
that is expected to be disturbed by excavation or other activities including off
site borrow and fill areas.
Estimate of the runoff coefficient of the site for both the
pre-construction and the post-construction conditions and data describing the
soil or the quality of any discharge from the site.
A general location map (city or county map) and a site map indicating the
following: drainage patterns and approximate slopes anticipated after major
grading activities, areas of soil disturbance, location of major structural and
non-structural controls identified in the SWPP, locations of where stabilization
practices are expected to occur.
Location of off-site material, waste, borrow or equipment storage areas.
Impacts to surface waters (including wetlands) and location where storm
water discharges to a surface water.
The location and description of asphalt plants and concrete plants
providing support to the construction site and authorized under this general
The name of receiving water at or near the site that will be disturbed or
that will receive discharges form disturbed areas of the project.
A copy of the TPDES general permit TXR150000
Information on whether listed endangered or threatened species or
critical habitats are found in proximity to the construction activity and
whether such species may be affected by the applicant’s storm water discharges
or storm water discharge-related activities.
Information on whether storm water discharges or storm water
discharge-related activities would have an affect on a property that is listed
or eligible for listing on the National Register of Historic Places.
The SWP3 must describe the best management practices that will be used to
minimize pollution in runoff. The description must identify the general timing
or sequence for implementation. At a minimum, the description must include the
Erosion and Sediment Controls must be designed to retain sediment on site
to the maximum extent practicable with consideration for local topography, soil
type and rainfall. Controls must also be designed and utilized to reduce the
offsite transport of suspended sediments and other pollutants if it is necessary
to pump or channel standing water from the site.
Control measures must be properly selected, installed, and maintained
according to the specifications of the manufacturer or designer. If periodic
inspections or other information indicates a control has been used incorrectly,
is performing inadequately, or is damaged, the operator must replace or modify
the control as soon as practicable after discovery.
Sediment must be removed from sediment traps and sedimentation ponds
prior to the time that design capacity has been reduced by 50%.
If sediment escapes the site, accumulations must be removed at a
frequency to minimize further negative effects and whenever feasible, prior to
the next rain event.
Controls must be developed to limit to the maximum extent practicable,
offsite transport of litter, construction debris and construction materials.
3. Stabilization Practices
The SWP3 must include a description of interim and permanent stabilization
practices for the site, including a schedule of when the practices will be
implemented. Site plans should ensure that existing vegetation is preserved
where it is possible.
- Stabilization practices may
include but are not limited to; establishment of temporary vegetation,
establishment of permanent vegetation, mulching, geo-textiles, sod
stabilization, vegetative buffer strips, protection of existing trees and
vegetation, and other similar measures.
- The following records must be
maintained and either attached to or referenced in the SWP3, and made readily
available upon request to the TCEQ inspector or the University Personnel of
- The dates when major grading
- The dates when construction
activities temporarily or permanently cease on a portion of the site and the
dates when stabilization measures are initiated.
- Stabilization measures must be
initiated as soon as practicable in portions of the site where construction
activities have temporarily or permanently ceased and except as described below
and must be initiated no more that fourteen (14) days after the construction
activity in that portion of the site has temporarily or permanently ceased.
Where the initiation of the stabilization measures by the 14th
day after the construction activity temporarily or permanently cease is
precluded by snow cover or frozen ground conditions stabilization measures must
be initiated as soon as practicable.
Where construction activity on a portion of the site is temporarily
ceased, and earth disturbing activities will be resumed within twenty-one (21)
days, temporary stabilization measure do not have to be initiated on that
portion of the site.
In arid areas 10” of rain annually and semiarid areas 10”-20” of rain
annually and areas experiencing droughts where the initiation of stabilization
measures by the 14th day after construction activity has temporarily
or permanently ceased is precluded by seasonably arid conditions, stabilization
measures must be initiated as soon as practicable.
3. Structural Control Practices
The SWP3 must include a description of any structural control
practices that will be implemented to divert flows away from exposed soils, to
limit the contact of runoff with disturbed areas or to lessen the off-site
transport of eroded soils.
Sediment basins are required, where feasible for common drainage
locations that serve an area with ten (10) or more acres disturbed.
Most locations on the Texas Tech Campus do utilize more than 10 acres and
sediment basins are not feasible within University Properties.
Sediment traps and basins may also be used to control solids in storm
water runoff for drainage location serving less than ten (10) acres. At a
minimum, silt fences, vegetative buffer strips, or equivalent sediment controls
are required for all down slope boundaries of the construction.
4. Permanent Water Controls.
A description of any measures that will be installed during the
construction process to control pollutants in storm water discharges that will
occur after construction operation has been completed must be included in the
SWP3. Permittees are only responsible for the installation and maintenance of
storm water management measures prior to final stabilization of the site or
prior to submission of an NOT.
5. Other Controls.
Off-site vehicle tracking of sediments and the generation of dust must be
The SWP3 must include a description of construction and waste materials
expected to be stored on site and a description of controls to reduce pollutants
from these materials
The SWP3 must include a description of pollutant sources from areas other
that construction (including storm water discharges from dedicated asphalt
plants and dedicated concrete plants), and a description of controls and
measures that will be implemented at those sites to minimize pollutant
Velocity dissipation devices shall be placed at discharge locations and
along the length of any outfall channel to provide a non-erosive flow velocity
from the structure to a water course so that the natural physical and biological
characteristics and function are maintained and protected.
6. Approved State and Local Plans
Permittees must ensure that the SWP3 is consistent with requirements
specified in applicable sediment and erosion site plan or site permits, or storm
water management site plans or site permits approved by federal, state, or local
SWP3’s must be updated as necessary to remain consistent with any changes
applicable to protecting surface water resources in sediment erosion site plans
or site permits, or storm water management site plans or site permits approved
by state or local officials for which the permittee receives written notice.
All erosion and sediment control measure and other protective measures
identified in the SWP3 must be maintained in effective operating condition. If
through inspection the permittee determines that BMP’s are not operating
effectively, maintenance must be performed before the next anticipated storm
event or as necessary to maintain the continued effectiveness of storm water
controls. If maintenance prior to the next anticipated storm event is
impracticable, maintenance must be scheduled and accomplished as soon as
practicable. Erosion and sediment controls that have been intentionally
disabled, run-over, removed, or otherwise rendered ineffective must be replaced
or corrected immediately upon discovery.
8. Inspection of Controls
event of flooding or other uncontrollable situations which prohibit access to
the inspection sites, inspection must be conducted as soon as access is
Personnel provided by the permittee and familiar with the SWP3 must
inspect disturbed areas of the construction site that have not been finally
stabilized, areas used for storage of materials that are exposed to
precipitation and structural controls for evidence of, or the potential for,
pollutants entering the drainage system. Sediment and erosion control measures
identified in the SWP3 must be inspected to ensure that they are operating
correctly. Location where vehicles enter and exit the site must be inspected for
evidence of off-site tracking. Inspection must be conducted at least once every
fourteen (14) calendar days and within twenty four (24) hours of the end of a
storm event of 0.5 inches or greater.
The SWP3 must be modified based on the results of inspection, as
necessary, to better control pollutants in runoff. Revision to the SWP3 must be
completed within seven (7) calendar days following the inspection. If existing
BMP’s are modified or if additional BMP’s are necessary, an implementation
schedule must be described in the SWP3 and wherever possible those changes
implemented before the next storm event. If implementation before the next
anticipated storm event is impracticable, these changes must be implemented as
soon as practicable.
A report summarizing the scope of the inspection, names and
qualifications of personnel making the inspection, the dates of the inspection
and major observations relating to the implementation of the SWP3 must be made
and retained as part of the SWP3. Major observations should include: the
location of discharges of sediment or other pollutants from the site , location
of BMP’s that need to be maintained, location of BMP’ that failed to operate as
designed or proved inadequate for a particular location and location where
additional BMP’s are needed.
Actions taken as a result of inspections must be described within, and
retained as part of the SWP3. Reports must identify any incidents of
non-compliance. Where a report does no identify any incidents of non-compliance,
the report must contain a certification that the facility or site is in
compliance with the SWP3 and this permit. The report must be signed by the
person in the manner required by 30 TAC § 305.128 relating to Signatories to
The SWP3 must identify and ensure the implementation of appropriate
pollution prevention measures for all eligible non-storm water components of the