Current through Register Vol. 47, No. 17, September 10, 2024
(1) The application for amendment of an
approved site location is available for domestic wastewater treatment works
projects. For lift stations, the application for amendment of an approved site
location shall be made to the Division on the proper form with a list of the
review authorities, as defined in section 22.9 , to whom the amendment proposal
has been provided. For domestic wastewater treatment plants, the application
for amendment of an approved site location shall be made to the Division on the
proper form with a list of the review authorities, as defined in section 22.6 ,
to whom the amendment proposal has been provided. In either case, review
agencies shall have 15 working days from receipt of the application to review
and comment directly to the Division unless a brief (less than 15 working days)
extension is requested in writing. The Division will not deem a lack of
comments from such agencies within the specified comment period as a
recommendation for denial during its consideration of the application. The
applicant is not required to provide copies to review authorities for the types
of disinfection modifications as described in section 22.10(2)(a)(ii).
(a) Forms shall be available from the Water
Quality Control Division, 4300 Cherry Creek Drive South, Denver, Colorado,
80246-1530 and on the Division's web page.
(b) The applicant, in consultation with the
Division, should also evaluate whether a discharge permit modification or
Request for Chemical Evaluation form is necessary and file the appropriate
application with the Division if it is needed.
(c) For all site location amendment
applications, accompanying the application shall be an adequate engineering
report describing the proposed project. The report shall be considered the
culmination of the planning process. A complete process or basis of design
report is not necessary for the site location application or to obtain site
location approval. Design review procedures are described in section 22.13 .
The engineering report submitted with the application shall meet all
requirements of Section 22.4 , including containing all information the
Division must consider pursuant to sections 22.3 and 22.5 and address and/or
include the following at a minimum:
(i)
Description/purpose of project and summary of proposed change.
(ii) Map identifying the site of the proposed
facilities.
(iii) Site Plan or
Process Flow Diagram (before and after proposed change).
(iv) Analysis of the loading, capacity and
performance of the existing treatment works.
(v) Changes to existing service area,
population and loading projections.
(vi) Description of how the proposed project
will impact the performance of other parts of the treatment works and the
impact on the facility's ability to meet effluent limitations (existing and
proposed).
(vii) Estimated cost of
project and funding source.
(viii)
Facility classification implications of project and staff or contractual
facility operator certification.
(ix) Project schedule.
(x) Geotechnical information per section
22.6(1)(b)(vii) for new structures.
(xi) Copy of Request for Chemical Evaluation
form and Water Quality Control Division, Permits Section's associated decision,
as required.
(xii) Change in
outfall sewer location (if required).
(xiii) Copies of agency referral
notifications.
(xiv) Water quality
planning targets developed in accordance with section 22.6 including changes in
target reclaimed water categories and standards - if required.
(xv) A description of anticipated future
effluent limits and a narrative description of the long range plan to achieve
those future effluent limits and how the proposed project fits within the long
range plan.
(2) An amendment is not required if the
changes consist of in-kind replacement, or operation and maintenance described
in 22.12(1) or do not include construction. An amendment to the site location
approval shall be required for any one of the following changes from conditions
reflected in an approved site application or from conditions at a domestic
wastewater treatment plant constructed prior to November 1967 and not expanded
or amended (modified) since that date:
(a)
Physical changes to any of the following treatment processes that is not
associated with a design capacity change:
(i)
Any changes in type of disinfection to include chlorine gas or from other types
of disinfection to chlorination. (A change from other types of disinfection to
any form of chlorination requires that a water quality planning target for
residual chlorine be obtained and included in the application).
(ii) A change in disinfection type (i.e.,
from gas chlorination to liquid chlorination, from any form of chlorination to
ultraviolet light disinfection, bromine chloride, chlorine dioxide, peracetic
acid, or other accepted disinfection chemicals).
(iii) Changes or additions to the liquid
stream treatment processes (e.g., sizing, technology, configuration, or recycle
stream associated with preliminary, primary, secondary, or tertiary treatment)
that could impact hydraulic, pollutant(s), or solids loadings to the treatment
process.
(iv) Changes or additions
to the unit processes in the solids stream treatment processes (e.g., aerobic
or anaerobic digestion, dewatering, composting, etc.) that would change the
characteristics of the recycle stream or biosolids.
(v) If a treatment entity is contemplating a
physical change to its treatment works that is similar in scope to those listed
above, but is not precisely covered by this list, then the entity must request
a Division decision by submitting an analysis from a professional engineer
registered to practice in the State of Colorado describing the proposed changes
and describing how those changes would affect the performance of other parts of
the treatment works, downstream treatment works, and effluent quality. Where
such an analysis is submitted, the Division shall evaluate the proposed process
change considering the list above and provide a written response to the entity
either stating that the changes may either be made without amending their
previous site location approval and obtaining design approval, or require a
site application amendment and subsequent design review. Such letter from the
Division shall clearly specify that the changes executed must not be more
extensive than those proposed in the engineer's analysis.
(b) A decrease or expansion in the approved,
rated design capacity of the treatment works, as long as no construction is to
take place, or a change in the design flow portioning that does not change the
design capacity. An increase or decrease in hydraulic capacity for a treatment
plant will require that the existing effluent limitations be analyzed in
coordination with the Division to determine whether new water quality planning
targets must be developed. Any changes in treatment requirements necessitated
by more stringent water quality planning targets must be addressed by the
proposed amendment to the site location.
(c) The addition of, or increase of a
treatment process to generate reclaimed domestic wastewater following secondary
treatment at an existing treatment plant that has previously received site
location and design approval. This amendment would also cover the change in
type of discharge employed which includes treatment changes to achieve more
restrictive reclaimed water categories and standards. Site approval amendments
are not required for adding re-use sites in accordance with the Reclaimed
Domestic Wastewater Regulation (5 CCR 1002-84).
(d) The following changes in the type of
discharge employed, where there is no change in the treatment process:
(i) From a surface water discharge to a
ground water discharge, or vice-versa, at the same approved site location,
subject to appropriate water quality planning targets; or
(ii) A partial or complete change from a
surface water or ground water discharge to reclaimed water use subject to the
requirements in the Reclaimed Domestic Wastewater Control Regulation
(5 CCR
1002-84). Such amendment is only required for the
first instance when reclaimed water use is implemented unless there is a
subsequent request to change reclaimed categories that requires the system to
meet different water quality planning targets. Site approval amendments are not
required for adding reclaimed water use sites in accordance with the Reclaimed
Domestic Wastewater Regulation (5 CCR 1002-84).
(3) An amendment to the
lift station site location approval shall be required for any of the following
changes that do not increase the design capacity of the lift station. The
applicant shall follow the notification procedures under Section 22.9 . Any
modifications for the purposes of biological treatment at the lift station are
not considered as a site location amendment and will be handled on a case by
case basis to be determined by the Division. The following are examples of the
type of changes to a lift station that require amendment to the lift station
site location approval:
(a) Addition or
modification of odor control treatment at the lift station.
(b) Addition or modification of emergency
storage or wetwell capacity.
(c)
Addition or modification of grinding/screening equipment.
(d) Addition or modification of back-up power
(generator).
(e) Rehabilitation or
replacement not meeting the definition of in-kind replacement, due to facility
age or for operational improvements including the inlet piping or associated
force main(s) as long as improvements do not increase the design capacity of
the lift station.
(f) Standard
operation & maintenance activities and in-kind replacement (see Section
22.12 for In-Kind Replacement requirements) of infrastructure are excluded from
the requirement to submit a site location amendment.
