HomeMy WebLinkAboutItem 2D: Resolution Concerning Modifciation of Stormwater SDC
ECC
UGENE ITY OUNCIL
AIS
GENDA TEM UMMARY
Adoption of Resolution 4876 Amending Local Stormwater Systems Development Charge
Methodology Concerning Credits; and Amending Resolution No. 4740
Meeting Date: June 12, 2006 Agenda Item Number: 2D
Department: Public Works Staff Contact: Fred McVey
www.eugene-or.gov Contact Telephone Number: 682-5216
ISSUE STATEMENT
The proposed resolution modifies the stormwater system development charge (SDC) methodology to
incorporate additional stormwater SDC credits associated with stormwater quality facilities and
pollution reduction measures.
BACKGROUND
Stormwater quality credits for SDCs are based on a public system benefit from development treating
stormwater quality through privately constructed and maintained facilities and effective impervious area
reduction techniques. Developments utilizing private means for water quality treatment can reduce the
demand for downstream public facilities for water quality treatment. Establishing stormwater quality
SDC credits provides a general recognition of reduced demand and provides a modest incentive for
meeting and exceeding minimum water quality treatment requirements.
The original development of proposed stormwater quality SDC credit provisions was accomplished with
the involvement of a Stormwater User Fee and SDC Department Advisory Committee (DAC). The
recommendation coming out of the DAC included: “A one-time stormwater SDC credit will be provided
for approved water quality treatment Best Management Practices (BMPs) that are in excess of the
minimum requirements, in recognition that stormwater runoff from developments utilizing such BMPs
requires fewer downstream public facilities for treatment. The sizing and degree of treatment provided
by the BMPs, and demonstration of exceedence of minimum requirements, will be based on the
methodology outlined in the City’s proposed Stormwater Management Manual.” The currently
proposed credit provisions are consistent in principle with those reviewed with the DAC and have been
updated to reflect the City’s currently-proposed stormwater development standards.
Implementation of stormwater quality SDC credits is related to adoption of stormwater development
standards which require water quality treatment at sites of new development. As indicated in the DAC
recommendations, adopted standards provide a basis for evaluation of the degree of impact reduction of
a development. The proposed credits recognize impact reduction and provide incentives for pollution
reduction across three types of development sites: 1) those not subject to the standards for stormwater
pollution reduction but which treat all or a portion (minimum 20%) of the impervious area of the
development site; 2) sites where a portion of the site impervious area is subject to the standards for
stormwater pollution reduction but treat runoff from 20% or more impervious area than the minimum
required; and, 3) sites where all of the site impervious area is subject to the standards for stormwater
pollution reduction which reduce a minimum of 20% of the total impervious area of the development
site through use of impervious area reduction techniques. More detail is provided in the proposed
revisions to the SDC methodologies as shown in Exhibit A to the proposed resolution (Attachment A).
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The stormwater SDC methodology was last substantively modified in April 2003. Stormwater SDC
rates have subsequently been adjusted based on an adopted construction cost index. Most recently,
Systems Development Charges for Local Wastewater System, Transportation System and Stormwater
System, were adjusted for inflation by Administrative Order No. 58-06-02-F, effective April 3, 2006.
Mayor Piercy, City Council and interested persons were notified of intended amendments to Eugene
Systems Development Charge (SDC) methodologies on February 16, 2006. A draft of the proposed
modifications was made available for public review on March 17, 2006. A copy of this information has
been available for viewing in the Council Office as well as on the City’s web site. A public hearing was
held on May 22, 2006, to receive public comment on the proposed SDC modifications. One person
testified and commented on matters largely unrelated to the proposed modifications. Members of the
council commented and asked for additional information which is provided in Attachment B to the AIS.
RELATED CITY POLICIES
Implementation of stormwater quality SDC credits is an element of the City’s stormwater program
related to stormwater pollution reduction and development standards. Relevant policies were
established through the City’s development of the Comprehensive Stormwater Management Plan,
Stormwater Basin Plans, and as articulated in the City’s stormwater NPDES permit. The NPDES permit
includes a specific action to implement stormwater development standards which address inclusion of
water quality treatment in the City’s development standards.
The policy issue before the council is whether to adopt by resolution a revised local stormwater SDC
methodology to include stormwater quality SDC credits which support pollution reduction efforts
related to implementation of new stormwater development standards.
COUNCIL OPTIONS
The council can approve, approve with amendments, or not approve the proposed resolution.
CITY MANAGER’S RECOMMENDATION
The City Manager recommends adoption of the proposed resolution.
SUGGESTED MOTION
Move to adopt Resolution No. 4876 amending local stormwater systems development charge
methodology concerning credits; and amending Resolution No. 4740.
ATTACHMENTS
A. Resolution No. 4876
B. Additional information related to Stormwater SDC credits for pollution reduction facilities
FOR MORE INFORMATION
Staff Contact: Fred McVey, Engineering Data Services Manager
Telephone: 682-5216
Staff E-Mail: fred.mcvey@ci.eugene.or.us
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ATTACHMENT A
RESOLUTION NO. ______
A RESOLUTION AMENDING LOCAL STORMWATER SYSTEMS
DEVELOPMENT CHARGE METHODOLOGY CONCERNING
CREDITS; AND AMENDING RESOLUTION NO. 4740.
The City Council of the City of Eugene finds as follows:
A.
On September 23, 2002, the System Development Charges (SDC) Methodologies
were adopted by Resolution No. 4740.
B.
Resolution No. 4740 has subsequently been amended, most recently by
Resolution No. 4795, which adopted amended SDC rates for the Regional Wastewater System,
effective July 1, 2004. In addition, Systems Development Charges for Local Wastewater System,
Stormwater System, and Transportation System were adjusted for inflation by Administrative
Order No. 58-06-02-F, effective April 3, 2006.
C.
After comprehensive review of the Stormwater SDC Methodology, and due to the
pending adoption of stormwater standards, a recommendation was made to adopt a water quality
credit. Implementation of stormwater quality SDC credits is related to adoption of stormwater
development standards which require water quality treatment at sites of new development.
Stormwater quality credits for SDCs are based on a public system benefit from development
treating stormwater quality through privately constructed and maintained facilities and effective
impervious area reduction techniques. Developments utilizing private means for water quality
treatment can reduce the demand for downstream public facilities for water quality treatment.
Establishing stormwater quality SDC credits provides a general recognition of reduced demand
and provides a modest incentive for meeting and exceeding minimum water quality treatment
requirements.
NOW, THEREFORE,
based upon the above findings,
BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF EUGENE, a
Municipal Corporation of the State of Oregon, as follows:
Section 1.
The excerpted Eugene Systems Development Charge Methodologies
document concerning stormwater quality credits attached as Exhibit A is adopted.
Section 2
. Resolution No. 4740 is amended as described in Section 1 as of the effective
date of this Resolution.
Section 3
. The City Recorder is requested to append a copy of this Resolution to
Resolution No. 4740.
Resolution - Page
1 of 2
ATTACHMENT A
Section 4
. This Resolution shall become effective July 12, 2006.
The foregoing Resolution adopted the ________ day of __________________, 2006.
___________________________________
City Recorder
Resolution - Page
2 of 2
REVISIONS TO
CITY OF EUGENE
SYSTEMS DEVELOPMENT CHARGE METHODOLOGIES
(EXCERPTS FROM GENERAL SECTION)
Effective July 12,2006
EXHIBIT A
TABLE 2
Potential Impact Reduction and Credits for Systems Development Charges
NOTE:
These are possible examples only; eligibility is established at time of
review of plans which approve the proposed improvements.
REDUCTIONS:
Successful bus pass program for employees
CREDITS:
Street width in excess of assessable width
Off-site, non-contiguous arterial or collector intersection
Street light on arterial or collector street
Off-site arterial or collector right of way and easement acquisition
Traffic signal on arterial or collector street
Off-street bicycle paths identified in adopted City plan
Off-site eligible public improvements where equivalent assessments can be collected
2. W'$tewat...$~'t.d'l
CREDITS:
Public Wastewater collection ~ines > 8-inch diameter
Public pump stations and pressure lines that serve more than the development
Off-site public improvements, where equivalent assessments can be collected
Prior payment of Metropolitan Wastewater Service District debt service
L)......... . >> ...... ...
I .. .... ...... 3.1._w~~$
REDUCTIONS:
Destination and Quantity: Reduction or elimination by retention of stormwater otherwise
discharged into public system
Pollution: Reduction of pollution via approved treatment techniques
CREDITS:
Stormwater collection lines > 24-inches in diameter
Major drainage channels: construction and off-site easement
Off-site public improvements where equivalent assessments can be collected or that .
benefit existing developments
Plrk$$:
CREDITS:
_ Land dedication (for sites accepted by City, consistent with adopted City plans)
On-site park facility dedication (for improvements accepted by City, consistent with
adopted City plans)
l>
7.0 Credits and Impact Reductions
This section provides detail on the City's administration of SOC credits and impact
reductions. Potential sources, criteria for eligibility, and the basis for calculation of credit
and impact reductions are defined, in this Methodology and in Eugene Code, 1971 section
7.730. A list of examples of facilities and programs which are potentially eligible for credit
and impact reduction appears in Table 2 of this section. (Note: As development standards
change sorne examples may no longer be considered eligible for reduction but may
influence future ratesJ In no case may the sum of all approved credits and impact
reductions fOr a single system exceed the amount of the SOC assessed for that system for
any approved building or development permit.
SOCs may be reduced by one or more of the following processes:
· Impact Reduction, based on quantified mitigation of demand generated by
the development for new identifiable capital improvements;
· Credit, based on the specific costs for privately engineered construction of
certain public improvements as part of the development;
· Credit based on previous payment or use.
Adjustment of SOCs due to credits and impact reductions:
· Shall not be given for improvements constructed or programs instituted prior
to City approval.
· Shall be applied up to the maximum SOC fee for each system.
. Shall reduce the SOCs paid on building permits at the time of issuance;
credit or impact reduction amounts applied will not be greater than the SOC
fees.
. Shall be applied to a particular system (e.g., Transportation, Stormwater,
Wastewater, Parks); credits or reductions approved for a particular system
can not be transferred or applied to any other system charges.
· Shall be applied to the SOCs for the particular development, may only be
further applied to subsequent phases of the same development for which
the improvement was constructed or program instituted, and can not be
transferred or applied to other properties or developments.
7.1 Impact Reductions or Mitigation
Impact reduction will be based on private physical improvements (as defined in
Appendix A) constructed as part of the development or based on programs
instituted in connection with development, which will reduce the demand from that
development for future construction of identifiable capital improvements. Such
programs and physical improvements must be privately financed and are intended
to be permanent. The anticipated reduction in demand must' be demonstrated to
the satisfaction of the City Transportation Engineer (for Transportation system
impact reductions) or to the City Engineer (for all other system impact reductions).
Calculation of impact reduction shall be based on the ratio of the system impact
with the program or facility in place, to the system impact if the program or facility
did not exist. .
Prior to application of the impact reduction to the SDCs for the development, the
City shall receive assurances that wiH bind the developer, owner, and the owner's
successors as is necessary to ensure that the program or facility will function as
planned for the agreed upon time period. Such agreements may include, but are
not limited to performance bonds, maintenance programs, annual reports,
monitoring and inspections, or other pertinent items to document proper functioning
as determined by the City Engineer.
7.1.1 Transportation System Impact Reduction
For the transportation system, an impact reduction may be granted if the
applicant demonstrates to the satisfaction of the City Transportation
Engineer, that the improvement or program to be instituted in connection
with the development will materially reduce the number of automobile trips
the development will generate and that it will continue for at least twenty
years after the development is occupied.
7.1.2 Stormwater System Impact Reduction or Mitigation
For the stormwater system, an impact reduction may be granted based on
two forms of impact reduction:
~ Destination and Quantity Reduction
~ Pollution Reduction .
These impact reductions will be granted after review and approval by the
City Engineer of the design documentation submitted in accordance with
standards specified in Eugene Code, 1971 section 9.6790 (3). Criteria for
stormwaterSDC impact reduction for development can be found in
Appendix D, section 6.0.
7.4 Application for Credit and Impact Reduction
An application for a credit or impact reduction, including related documentation and
information, shall be submitted by the applicant in the manner prescribed by the
City, together with any fee set by the City Engineer pursuant to Eugene Code,
1971 section 2.020. The applicant shall have the burden of demonstrating the
eligibility for a credit and/or impact reduction. No credit or impact re~uction shall
be granted for an SDC that has already been imposed, collected or agreed to be
paid in installments unless resulting from cancellation of an active permit,
expiration of a permit without being used, or an approved change of design of an
active permit.
7.4.1 Application for Impact Reduction
Applicants must submit their request for an impact reduction in writing,
accompanied by documentation that supports the basic function and
design criteria for estimated impact reduction.
For commercial development, impact reduction will be applied uniformly
for all lots or building sites in the development phase approved. Impact
reductions granted under this methodology document may be used in
subsequent phases of a development when the applicant demonstrates to
the satisfaction of the City Engineer that the program or improvements
continue to provide the anticipated reduction in demand, and the City has
received assurances or agreements from the developer, owner, and
owners successors, as approved by the City Engineer as is necessary to
ensure that the program or facility will continue to function as planned for
the agreed upon time period. Changes to the mitigated program or facility
attributable to the connection of an additional phase which results in any
deviation from the previously determined impact reduction will be
adjusted proportionately.
REVISIONS TO
CITY OF EUGENE
SYSTEMS DEVELOPMENT CHARGE METHODOLOGIES
(APPENDIX D)
Effective July 12, 2006
Appendix D
Stormwater System Charge Detail
1.0 Formula
The impact analysis for the stormwater system is based on square footage of impervious
surface, which creates an impact on the stormwater system by land use type. Impervious
surface is defined in section 6.406 Eugene code, 1971 as "any hard surface area which causes
water to run off the surface in greater quantities or at an increased rate of flow from conditions
pre-existing to development. Common impervious surfaces include, but are not limited to,
rooftops, walkways, driveways, parking lots, or concrete or asphalt surfaces." The estimated
non-assessable cost of the system-wide capacity from future capacity-enhancing projects, as
contained in the Stormwater SDC-Eligible Project List, and the estimated available capacity in
the existing stormwater system projected to be used by new development is used as the basis
for determining the stormwater SDC.
The stormwater SDC is comprised of an improvement fee and a reimbursement fee, as new
development will require the construction of additional system capacity as well as the use of
available capacity in the existing system. The per unit cost of additional capacity for the
improvement fee is based on the value of the system-wide capacity of future capacity-
enhancing projects (current planned projects are listed in the Stormwater SDC-Eligible Project
List, T.able 10) divided by the total projected impervious surface area that will be added by new
development at build-out within the Urban Growth Boundary (UGB). The per unit cost of
existing capacity for the reimbursement fee is based on the value of available system-wide
capacity within the existing system projected to be used by new development divided by the
total projected impervious surface area that will be added by new development at build-out
within the UGB.
The value of the future stormwater system is based on the estimated costs of planned future
capacity-enhancing stormwater projects contained within stormwater plans and the Capital
Improvement Plan (CI.P). Of that total value, the SDC-eligible component is attributable to those
portions of future projects that are non-assessable and capacity-enhancing and related to the
demands of future development; Le. add new capacity for new users.
The total value of the existing system is estimated based on the replacement cost of the
stormwater system components, which include both piped system and open channel system
components. Assessable costs are excluded from the SDC-eligible existing system costs.
Assessable costs are determined using the approach specified in the City Code. The city
assesses up to and including the first 24 inches of pipe diameter or equivalent capacity. The
non-assessable portion o'f stormwater system costs (SDC eligible costs) is based on
replacement costs minus assessable costs. The portion of non-assessable existing system
value allocated to new development (SDC-eligible value) is established by determining the
percent of piped system and open channel system capacity projected to be used by new
development. The use of capacity of the existing system is estimated with use of hydraulic
modeling to identify existing available capacity (based on existing land use and flow data) and
expected future conditions (based on Metro Plan designations).
The total unit cost per square foot of impervious surface area is the sum of the per unit costs of
additional capacity of the improvement fee and reimbursement fees. Table 9 provides a
detailed breakdown of the calculation and numerical supporting data of the stormwater SOC.
Figure 6 illustrates the calculation formula of the stormwater SOC. The stormwater SDC rates
per unit of capacity can be found in Appendix F in the current adopted SDC fee schedule.
2.0 Single Family Dwelling and Duplex Rates
The stormwater SDC for single family residential development is comprised of three rate
categories: Small residential with a building footprint of 1,000 square feet or less; Medium
residential with a building footprint of greater than 1,000 but less that 3,000 square feet; and
Large residential with a building footprint of 3,000 square feet or more. Building footprint is
defined as the first floor area plus attached or detached garage or carport. For the Small and
Medium residential rate categories, an estimated average impervious surface area (square feet)
specific to each category is multiplied by the current total stormwater SDC rate per square foot
to determine the appropriate single-family residential stormwater SDC flat rate per dwelling unit.
For the Large residential category, the stormwater SDC is determined by multiplying the actual
impervious .surface of the total proposed building site by the current total stormwater SDC unit
cost per square foot. The stormwater SDC for a duplex is calculated as two times the
appropriate stormwater SDC flat rate of either a Small or Medium residential category. Duplex
units equal to or over 3,000 square feet each are treated as Large residential. Details of the
stormwater SDC analysis are provided in Table 9. Rate formulas, calculations, and fee
schedule are provided in Appendix F.
3.0 Manufactured Home Park Rates
Manufactured home developments are charged a flat rate per individual space based on the
estimated average impervious area for a doublewide manufactured home, plus any additional
common area impervious surface (e.g., clubhouse, private streets). To determine the amount of
stormwater SDC attributable to .the proposed spaces in the park, the total number of proposed
spaces is first multiplied by the estimated average impervious surface area (square feet) per
space, the results of which are then multiplied by the current total stormwater SDC unit cost per
square foot. To determine the amount of stormwater SDC attributable to all additional common
area impervious surfaces within the park, these areas will be measured separately and the sum
of this additional actual impervious surface area (square feet) will be multiplied by the current
total stormwater SDC rate per square foot. Details of the stormwater SDC analysis are provided
in Table 9. Rate formulas, calculations, and fee schedules are provided in Appendix F.
4.0 . Multi-Family and Non-Residential Rate
For all uses not listed in sections 2.0 and 3.0 above (e.g. multi-family, commercial, industrial) or
whenever this Appendix 0 makes reference to a rate per square foot of impervious surface area,
the stormwater SDC collected is determined to be the current stormwater SDC rate per square
foot of impervious surface area as adopted in the SDC fee schedule located in Appendix F.
5.0 Stormwater Impacts Not Attributable to Impervious Surface- Area
For all uses not listed in sections 2.0, 3.0, and 4.0 above, where any development type creates
an impact through discharges to the public stormwater system (as allowed by Eugene Code
1971 section 6.610) which are not attributable to creation or modification of impervious surface
area, will have stormwater SDCs calculated by evaluating the equivalent impervious surface
area which would generate a similar impact.
6.0 Stormwater System SDC Impact Reduction Criteria
Two forms of separate and potentially additive impact reduction credits may be provided:
reduced impact due to reduced quantity of stormwater runoff discharged to the City stormwater
system and reduced impact due to pollution reduction water quality treatment which exceeds
minimum standards.
6.1 Stormwater Destination and Quantity Reduction
Reduction or elimination of stormwater which otherwise would be discharged into the public
stormwater system may result in a corresponding reduction of stormwater SDC collected at the
time of building and development permit issuance. Reduction of the stormwater SDC will be
proportional to the reduction of runoff entering the public system from the fully developed site.
(Note: detention facilities are not eligible for stormwater SDC impact reduction.) A 100%
reduction in the stormwater SDC will be granted only for the complete containment and
management of all runoff from the site that would otherwise directly or indirectlyeriter into the
City's publicstormwater system. Runoff discharged into an area that does not ultimately enter
the City's public stormwater system constitutes acceptance of responsibility for compliance with
any state or federal regulations that apply to the area or body of water receiving the runoff. To
be eligible for the impact reduction, the development must meet standards for stormwater
destination specified in Eugene Code 1971 section 9.6790 (3) in a manner which demonstrates
ongoing reduction in/impact to the publicsystem.
6.1.1 Single-Family Development (SFD) and Duplex Development
Because stormwater SDCs for small- and medium-residential SFDs and duplexes are
based on estimated average amounts of impervious surface areas, these buildings can
qualify only for one of two impact reduction rates:
a) 100% SDC reduction for complete elimination and management of runoff from
the site entering the public system or discharging into an area which ultimately
enters into the public system; or
b) 50% reduction for partial reduction and management of runoff from the site
entering the public system regardless of the amount of reduction.
The SDC reduction will be granted after review and approval by the City ~ngineer of the
stormwaterdestination design and documentation submitted in accordance with
standards specified in Eugene Code 1971 section 9.6790 (3).
6.1.2 Manufactured Home Park, Multi-family and Nonresidential Development
Stormwater SDCs for these uses will be reduced proportional to the reduction in total
stormwater runoff entering the public stormwater system from the fully developed site.
(Total stormwater runoff includes both runoff from the site in its natural condition and any
increase due to construction of impervious surfaces). The SDC reduction will be granted
after review and approval by the City Engineer of the stormwater destination design and
documentation submitted in accordance with standards specified in Eugene Code 1971
section 9.6790 (3).
6.2 Stormwater Pollution Reduction
Reduction of stormwater pollution through water quality treatment techniqu'es may result in a
corresponding reduction of stormwater SDC collected at the time of building and development
permit issuance. A single-level water quality SDC credit of 10% of the total stormwater SDC is
applied to three categories of development:
1) Development sites not subject to the standards for stormwater pollution
reduction of Eugene Code 1971 section 9.6791 (3), but which treat a minimum of 20% of the
total impervious area of the development site through privately maintained techniques and
facilities in a manner which meets said standards;
2) Development sites where a portion of the site impervious area is subject to the
standards for stormwater pollution reduction of Eugene Code 1971 section 9.6791 (3) and for
which approved privately maintained stormwater management facilities are constructed which
treat runoff from 20% or more impervious area than the minimum required, or which reduce a
minimum of 20% of the total impervious area of the development site through use of impervious
area reduction techniques specified in Eugene's adopted Stormwater Management Manual;
3) Development sites where all of the site impervious area is subject to the
standards for stormwater pollution reduction of Eugene Code 1971 section 9.6791 (3) which
reduce a minimum of 20% of the total impervious area of the development site through use of
impervious area reduction techniques specified in Eugene's adopted Stormwater Management
Manual. .
ATTACHMENT B
Public Works
Engineering
City of Eugene
MEMORANDUMMEMORANDUM
858 Pearl Street
Eugene, Oregon 97401
(541) 682-5291
(541) 682-5032 FAX
Date:
June 5, 2006
To:
Mayor Piercy and City Council
From:
Fred McVey, 682-5216
Engineering Data Services Manager
Subject:
Additional Information Related to Stormwater SDC Credits for Pollution Reduction
Facilities
This memorandum provides additional information requested by members of the City Council related
to the May 22, 2006 public hearing on proposed modifications to the stormwater systems
development charge (SDC) to include credits for qualifying construction of private stormwater
pollution reduction facilities. Additional information and clarification requested include:
?Examples of development types which would qualify for the proposed credits.
?Whether development would qualify for credits when simply meeting minimum requirements.
?Clarification of the relationship of proposed SDC credits to the City’s intended monitoring
and enforcement program for on-going requirements for private stormwater facility
maintenance.
?Adequacy to the SDC administrative fee to cover increased costs of determination of credit
eligibility.
Examples of development types which qualify for credits.
The proposed credits are structured to recognize impact reduction and provide incentives for
pollution reduction across three types of development. A development example is provided for each
qualifying development type.
1) Sites not subject to the development standards for stormwater pollution reduction but which treat
all or a portion (minimum 20%) of the impervious area of the development site may qualify. An
example is a commercial development constructing a small building with vehicular access, such as an
espresso stand. This development is adding less impervious area than the minimum threshold which
triggers development standards, e.g. 2,000 square feet, but chooses to construct a water quality
feature which conforms to the adopted design standards. Assuming development on a partially
developed existing lot with a total impervious area of 10,000 square feet at the site and construction
of an approved facility which treats runoff from at least 2,000 square feet for the site’s impervious
area (meeting the 20% minimum of the site), the development would qualify for a 10% reduction of
April 4, 2006 Memo page 1
the stormwater SDC related to the 2,000 square feet of added impervious area. Using current SDC
rates of $0.165 per square foot, this development would normally be charged $330.00 stormwater
SDC but would qualify for a 10% or $33.00 reduction, resulting in a net SDC of $297.00.
2) Those sites where a portion of the site impervious area is subject to the standards for stormwater
pollution reduction but treat runoff from 20% or more impervious area than the minimum required
may also qualify. An example of this qualifying development type is a commercial development
constructing a building addition. The example development is adding more impervious area than the
minimum threshold which triggers stormwater quality development standards, e.g. 10,000 square feet,
but chooses to construct an approved water qualify feature which treats runoff from more impervious
area than the minimum required. In this case, the development standards would require that runoff
from a minimum of 10,000 square feet at the site be treated through a facility or methods specified in
the stormwater design manual. Assuming construction of an approved facility which treats runoff
from at least 12,000 square feet of the site’s impervious area (meeting the credit criteria of 20%
additional area over the minimum required), the development would qualify for a 10% reduction of
the stormwater SDC related to the 10,000 square feet of added impervious area. Using current SDC
rates of $0.165 per square foot, this development would normally be charged $1,650.00 stormwater
SDC but would qualify for a 10% or $165.00 reduction, resulting in a net SDC of $1,485.00.
3) Sites where all of the site impervious area is subject to the standards for stormwater pollution
reduction which use impervious area treatment reduction techniques to manage runoff from a
minimum of 20% of the total impervious area of the development site may qualify. An example of
this type of development is a medium-sized single family residence being constructed on a site subject
to the standards and which implements an approved impervious area runoff reduction facility, such as
an eco roof & roof garden. Assuming the area treated by the eco roof & roof garden is at least 20%
of the gross impervious area at the site, this residence would qualify for a 10% reduction if the normal
stormwater SDC for a typical residence. Using current SDC rates of $478.50 per medium sized
single family residence this development would qualify for a 10% or $47.85 reduction, resulting in a
net SDC of $430.65.
Development meeting minimum requirements and qualifying for a credit.
As illustrated in the examples above, most development types must exceed minimum requirements of
stormwater development standards to qualify for an SDC credit. In addition, development subject to
stormwater development standards which uses treatment impervious area reduction techniques in
order to meet minimum requirements may also qualify for a reduction. Numerous options are
available for development to meet minimum requirements of the stormwater development standards; a
credit is proposed only for those using impervious treatment area reduction methods to meet or
exceed minimum requirements. This is intended to encourage impervious area reduction methods
which provide effective methods of pollution reduction by directly reducing the amount of gross
impervious area from which runoff must be separately or additionally treated.
Monitoring and enforcement program related to on-going requirements for private facility
maintenance.
An element of the implementation of stormwater development standards for pollution reduction
facilities is implementation of a private facility maintenance monitoring and enforcement program.
This program is necessary to ensure that the pollution reduction achievements related to construction
April 4, 2006 Memo page 2
of such facilities is sustained over time through proper operation and maintenance. A concern was
expressed that a development may qualify for an SDC credit for a constructed facility which fails to
perform as intended in the future due to a lack of maintenance, negating the original basis of the
credit. While the primary intent of the enforcement program is to ensure stormwater quality
improvements are sustained, a result of the program will also be to ensure that the basis of past SDC
credits continues. There will be no effect on the cost to the private facility monitoring and
enforcement program due to adoption of the proposed SDC credits.
Adequacy to the SDC administrative fee to cover increased costs of determination of credit
eligibility
The administrative fee component of the SDC covers various costs of ensuring that SDCs are
administered in a manner which complies with statutory requirements. The administrative fee is
currently five percent of the total SDC and has been adequate to cover all activity costs associated
with SDC administration, including SDC credit determination associated with development permits.
It is not anticipated that review of proposed stormwater SDC credits will add substantially to existing
review costs; however, the adequacy of the SDC administrative rate is reviewed periodically and will
be monitored for adequacy given incremental changes in SDC methodologies and related SDC
credits.
I hope this additional information and clarification is responsive to Councilor’s questions and
concerns. If you have any questions regarding this information, please contact me at 682-5216 or by
fred.mcvey@ci.eugene.or.us
email at .
April 4, 2006 Memo page 3