EPA-908/5-79-001C
RECORD OF DECISION
JACKSON WASTEWATER TREATMENT SYSTEM
TOWN OF JACKSON, WYOMING
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APRIL 1979
U.S. ENVIRONMENTAL PROTECTION AGENCY, REGION VIII, DENVER, COLORADO 80203

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EPA - 908/5-79-001C
RECORD OF DECISION
JACKSON WASTEWATER TREATMENT SYSTEM
TOWN OF JACKSON, WYOMING

%, J
U.S. ENVIRONMENTAL PROTECTION AGENCY
Region VIII
1860 Lincoln Street
Denver, Colorado 80295
Approved by
Alan Merson
Regional Administrator
Date:
April 20, 1979

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DISCLAIMER
This report has been reviewed by the EPA Reqional Administrator
and approved for publication. Mention of trade names, commercial
products or a particular technique does not constitute endorse-
ment or recommendation for use.
DOCUMENT AVAILABILITY
This document is available in limited quantities through the
U.S. Environmental Protection Agency, Environmental Evaluation
Branch, 1860 Lincoln Street, Denver, Colorado 80295. This
document is also available to the public through the National
Technical Information Service, Springfield, Virginia 22161.

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Description of the Selected Action
The selected project will require construction of an aerated
lagoon/rapid infiltration treatment system on approximately 55
acres at the South Park Lower Bench Site. The land has been
dedicated to the Town of Jackson for the facility, with an
additional ten acres of land for future expansion offered to the
Town for sale. A sewer interceptor extending four miles through
South Park will be constructed.
Two lagoon cells would be aerated, with a third lagoon serving
as a storage basin. Approximately seven infiltration beds for
effluent disposal would be built with material excavated from the
east side of Flat Creek. This project includes a septic tank dump
station at the present wastewater plant site.
The selection of the lagoon/rapid infiltration treatment
alternative at the South Park Lower Bench Site was based on the
following consideraions:
*	Lowest average annual costs including operation and
maintenance (0/M) costs.
*	The use of rapid infiltraton beds does not involve a
direct discharge to Flat Creek except during the winter
if ice conditions in the beds prevent their use.
*	Visual impacts and odor problems are considered minor.
*	No problems are anticipated in site acquisition and the
proposed location includes adequate land for future
expansion.
*	The site is not located in the 100-year floodplain nor
does it involve any unique environmentally sensitive
areas.
*	No significant impacts should occur on elk migration and
the project may have significant beneficial effects on
fish and waterfowl habitats.
*	The system requires minimal maintenance and energy
consumption is low.
The project requires installation of a four mile long (22,000
feet) interceptor pipeline running south through South Park along
the Flat Creek route to the South Park Lower Bench Site. This
route has the lowest average annual costs of any route
considered. Discussions with local land owners indicate no
right-of-way problems are anticipated.

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EPA's Decision
The project selected by the Town of Jackson was developed
following the decision by EPA not to fund a deep aerated
stabilization pond system in the State-owned South Park Elk
Feedground as proposed by the Town in 1974. EPA based this
decision on probable adverse impacts identified in the draft EIS
which included: serious legal difficulties in acquiring the land
in the feedground, the adverse effect upon the elk herd, the
proposed site was located in the 100-year floodplain, conflicts
with the goals established by the Snake River Wild and Scenic
River Study, and that the proposal would "open up" the rural South
Park area to residential development.
Relocating the site to the selected South Park Lower Bench
Site resolved all but the latter impact of induced secondary
affects upon undeveloped lands. This site was challenged by two
of the three Teton County Commissioners who indicated their
opposition to the proposed location based on the secondary impacts
of fostering new residential developments at a faster pace and
possibly at higher densities than proposed in the County
Comprehensive Plan. Following mediation between the two local
governments, EPA signed a joint agreement on April 13, 1978,
designed to minimize these secondary impacts. The key provision
requires the Town and County to establish priorities and limits to
the rate of taps from outside the city.
By date of this record of decision, EPA approves the facility
plan for wastewater treatment for the Town of Jackson for the
selected treatment alternative of a lagoon/rapid infiltration
system at the South Park Lower Bench Site utilizing the Flat Creek
interceptor route.

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Alternatives Considered
Alternative A-l - Construction of a new mechanical plant at
the site of the existing wastewater treatment plant.
The existing treatment facility would be expanded and
improved to meet the projected demand for the year 1995. The
proposed improvements required the addition of a flow
equalization basin and conversion of the present extended
aeration system to contact stabilization, secondary
clarifiers, aerobic digesters, sludge handling facilities and
disi nfection.
Alternative A-2 - Construction of a mechanical plant on the Boyles
Hill school property.
An activated sludge plant located on State school land at
the south end of Boyles Hill was another option. The land has
been utilized as a gravel quarry and has undergone extensive
surface disruption. This site would necessitate an
interceptor line from the Town to Boyles Hill and an outfall
line to the Snake River.
Alternative A-3 - A stabilization pond constructed on the Boyles
Hill school property.
A deep lagoon stabilization pond could be constructed on
the Boyles Hill site. An outfall line to the Snake River
would be required for the disposal of treated effluent.
Alternative A-4 - A stabilization pond constructed at a central
mid-South Park location.
Another option was to construct a stabilization pond
system located at a site south of Boyles Hill known as a
Mid-South Park location. This location would service the area
of proposed development near the Town with a much shorter
pipeline than would be required for the selected South Park
Lower Bench Site. Treated effluent would be discharged
through an outfall line to the Snake River.
Alternative A-5 - A stabilization pond constructed at a South Park
location adjacent to Lower South Park Road.
Alternative A-5 was similar to A-4 in that it would
entail the construction of a deep aerated stabilization pond
system in the South Park area. The facility would require an
outfall line running south to the main channel of the Snake
River. The siting of a plant at this location would
immediately open up a substantially larger amount of land to
be serviced by gravity flow than the Mid-South Park
Alternative.

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Alternative A-6 - Interim upgrading of the existing plant to
provide adequate wastewater treatment for the existing population.
In order to improve the system to a higher degree of
operation, interim (short term) upgrading of the existing
system was considered. This would require finishing the plant
as it was originally designed plus the addition of
chlorination facilities and a general maintenance overhaul.
Reserve capacity would only be sufficient for a two or three
year period until additional expected growth would require
additional treatment capacity.
Alternative A-7 - No further action on the Town's part to improve
wastewater treatment.
Under this option, the Town would do nothing to further
improve the condition of their wastewater system, reduce odor
problems and the water quality degradaiton that is presently
occurring. Notice of NPDES permit violations would then be
issued by the Wyoming Department of Environmental Quality.
Alternative 1 - Aerated lagoon/rapid infiltration system located
at the South Park Upper Bench Site.
Another option included an aerated lagoon/rapid infiltration
system located at the South Park Upper Bench site near U.S.
Highway 189. As with the Lower Bench Site, the upper site is not
located in the 100-year floodplain. Although the site is owned by
the same individual as the selected location, there is reluctance
to sell the site due to higher development values and the
potential for adverse visual impacts from the highway.
Alternative 2 - An oxidation ditch at the South Park Upper Bench
Site.
Alternative 2 utilizes an oxidation ditch process at the Upper
Bench site. This type of plant is an activated sludge process
that uses a continuously recirculating loop channel, in this case
two loop oxidation basins. Approximately four (4) acres of land
at the Upper Bench location are required for the system, with an
additional 15 acres needed for sludge burial.
Alternative 4 - An oxidation ditch at the South Park Lower Bench
Site (Note: Alternative 3 is the selected option).
The final treatment alternative considered was the same
oxidation ditch process at the Lower Bench site. However, the
proposed method for sludge disposal involved truck transport due
to soils and groundwater conditions at the site which prohibited
burial or land application.

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Cost Effective Analysis of Alternatives
TABLE 1
ALTERNATIVE TREATMENT COST ESTIMATES
TOWN OF JACKSON WASTEWATER FACILITIES PLAN
No.
Alternative
Description
Capital
Cost ($)
Annual 0/M
Cost ($/.yr)
Average Annual
Present Worth
A-l
Existing site
2,973,000
155,000
671,000
A-2
Mechanical
Plant Boyles
Hill
4,896,000
179,700
874,600
A-3
Stabilization
Pond Boyles
Hill
3,278,000
69,700
431,200
A-4
Stabilization
Pond Mid-
South Park
3,496,000
68,300
441,500
A-5
Stabilization
Pond - South
Park Road
4,487,000
72,300
535,300
A-6
Interim up-
grading of the
Existing Site
(only to 1980)
373,000
83,700
(rejected on
the basis of
requiring
additional
expansion in
two years)
A-7
No action
no grant costs
(rejected as
not meeting
legally
required water
quality
standards)

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Alternative
No. Description
1	Aerated
Lagoon/Rapid
Infiltration
at Upper Bench
Site w/Flat
Creek Inter-
ceptor
2	Oxidation
Ditch at
Upper Bench
Site w/Flat
Creek Inter-
ceptor
3	Aerated
Lagoon/Rapid
Infiltration at
Lower Bench Site
w/Flat Creek
Interceptor
(Selected)
4. Oxidation	4,867,700 131,300	576,000
Ditch at
Lower Bench
Site w/Flat
Creek Inter-
ceptor
(Cost analysis for Alternatives A-l through A-7 completed by James
M. Montgomery Engineers of Boise, Idaho, February 1977 price base;
Cost analysis for Alternatives 1 through 4 completed by C. E.
McGuire Engineers of Grand Junction, Colorado August 1978 price
base.)
Capital Annual 0/M Average Annual
Cost ($) Cost ($/,yr) Present Worth
4,483,300 70,500 479,200
5,100,300 131,800	597,800
4,407,900 70,000	473,300

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The cost comparison was done in two phases. In the first
phase, alternatives A-l through A-7 were considered. Alternatives
A-6 and A-7 were rejected on the basis given on the chart.
Alternatives A-2, A-3, and A-4 were also rejected because they
required an outfall line to a meandering section of the Snake
River which was incompatible with goals of the Snake River Wild
and Scenic River Study and these outfall line routes crossed
several significant wetlands. While the Town preferred a site
near South Park Road (A-5), the Teton County Commissioners were
opposed to this site. The Town of Jackson reasoned and EPA
concurred that moving from the existing site was necessitated by
the likelihood of the town expanding around and beyond this site
and that while Flat Creek flows are sufficient to handle secondary
effluent now, costly tertiary treatment would be required in the
future. According to EPA's cost effectiveness criteria, the South
Park Road site is cost effective even though capital costs are
significantly higher than expansion at the Existing Site. In
comparing the average annual present worth costs of these two
facilities (See Table I), the South Park Road Site costs are
considerably less due to much lower annual operation and
maintenance costs.
At the end of this first phase which culminated in the April
13, 1978 Tri-Party Agreement, the South Park Road Site with
lagoons (A-5) was selected as the cost-effective environmentally
acceptable solution. The second phase of the cost-effective
analysis (the final EIS and facility plan update) resulted in cost
analysis of alternative sites near the South Park Road Site. This
included the Upper and Lower Bench Sites and two treatment options
at each site, both designed to meet summer ammonia limits
determined to be necessary. The treatment options included
aerated lagoons followed by rapid infiltration in order to
eliminate the need for any outfall line and oxidation ditches.
(Alternatives 1, 2, 3 and 4). The cost effective analysis
indicated an aerated lagoon/rapid infiltraton system was
cost-effective. Due to visibility from the highway, lack of
expansion area, land owner reluctance to sell, and their nearly
identical costs, the Upper Bench Site was rejected in favor of
selecting the Lower Bench Site.

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Environmentally Preferred Alternative
Based on the secondary impacts to agricultural land, expansion
at the existing site (Alternative A-l) is the environmentally
preferred solution. This site would not result in the induced
development assisted by a federal grant of the agricultural
ranching land i-n South Park. However, the proposed low density
development in this area as allowed under the Teton County
Comprehensive Plan would not have entirely preserved this area for
ranching either. Further, there could have been a proliferation
of smaller package plants in this area if the County continued to
approve large developments as it did in 1975 with the approval of
the 495 unit Raptor J Ranch. Thus, EPA entered into mediation
between the County and Town regarding the problems of reducing the
induced secondary impact to this agricultural land and the problem
of the costs of urban sprawl. (Note: Protection of floodplains,
wetlands, steep slopes and other environmentally sensitive areas
was provided for in the Teton County Comprehensive Plan.) The
result of this mediation was the April 13, 1978, Tri-Party
Agreement which specified certain means of reducing this secondary
effect. The key provision is the future establishment by Teton
County and the Town of Jackson of an out-of-city tap-in limit
which will specify the number of taps provided annually to areas
beyond that area immediately adjacent to the Town.
On the basis of water quality only, the selected project of
aerated lagoons followed by rapid infiltration at the South Park
Lower Bench Site is the environmentally preferred solution. Other
solutions required either an outfall line to the Snake River
contrary to the goals of the Snake River Wild and Scenic River
Study or continued discharge to Flat Creek which would eventually
require costly tertiary treatment.
Considering both factors of water quality and induced land use
changes, EPA has determined that the selected site, when combined
with the binding agreement which mitigates effects on this
agricultural land, constitutes an environmentally acceptable
solution.

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Issues Considered in Making the Decision
1) Flat Creek Water Quality
Problem - Flat Creek water quality is adversely impacted by
discharge from the present Jackson Treatment plant. Water
quality data indicate that fecal coliform standards are
frequently exceeded downstream from the plant, with ammonia
and total phosphate concentrations also showing substantial
increases. The existing treatment facilities are not capable
of meeting the NPDES permit requirements established by the
Wyoming Department of Environmental Quality.
Conclusion - The Jackson, Wyoming 201 Wastewater Facilities
Plan Update (October, 1978) and the original 1974 facilities
plan identified nine alternative wastewater treatment systems
for the Town of Jackson for capacity to 1995, an interim
upgrading option, and the "no action" alternative. Selection
and implementation of any of the nine treatment alternatives
is required in order to provide the Town of Jackson with
treatment facilities to adequately serve the community through
1995. Therefore the no action or interim upgrading
alternatives were rejected. Further, maximum protection of
Flat Creek water quality is provided by the no-discharge rapid
infiltration alternatives. The level of treatment achieved by
the selected system, combined with the ground water dilution,
would not be expected to result in any violations of drinking
water or surface water quality standards.

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2) Land Use Changes in South Park
Problem - The proposed location for the selected treatment
facility will provide the potential for increased urban-type
development in South Park due to the availability of central
sewer facilities. This growth potential is in conflict with
the goals and policies of the Teton County Comprehensive Plan
and Implementation Program which generally encourages the
preservation of the "ranching lifestyle and economy,"
designates South Park for low density development, and
specifies that sewage treatment plants and other facilities
should not be located where they will foster scattered
development. On the other hand, even low density development
as allowed under the Comprehensive Plan would not adequately
preserve the ranching life style and economy. In 1975, the
County approved the Raptor J Ranch development in South Park
for 495 residential units. This development included a
proposed satellite package plant for sewage treatment. Such
"owner-operated" plants have poor operation and maintenance
histories in Wyoming. A proliferation of package plants and
individual disposal systems would be expected without central
collection.
Conclusion - In order to minimize the problem of secondary
impacts, the Town of Jackson, Teton County and EPA have
entered into a tri-party agreement which attempts to restrict
the number of out-of-city taps to the treatment plant.
According to the legally binding agreement, the annual number
of out-of-city taps allowed by the County and the Town must be
determined prior to completion of the facilities.
The Jackson Town Council supports the selected South Park
Lower Bench location. Similarly, a majority of the Teton
County Commission (1979 elected term) have indicated support.
This support, coupled with a carefully defined out-of-city
tap-in rate, will result in minimizing secondary impacts.
However, the decision will also result in the need to amend
the County's Comprehensive Plan and Implementation Program to
the theme of urbanization of South Park. Most of this area,
which includes approximately 6,500 acres of undeveloped land,
is currently planned for a maximum density of one unit per six
acres, or not more than one unit per three acres if
groundwater levels drop below three feet upon removal of
irrigaton. These density limitations are based primarily on
individual wastewater treatment constraints which would be
effectively removed by central sewer availability.

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Odors and Visual Intrusion
Problem - The present wastewater treatment plant has
objectionable odors and is unsightly. Consideration of
aesthetics in the design, construction, and operation of
wastewater treatment works is necessary to minimize these
effects.
Conclusion - The Lower Bench Site would be less visually
impacted than any other site due to the distance and elevation
from U.S. Highway 189. Similarly, potential odor problems
would also be less at the Lower Bench Site due to the
remoteness of the location. Approximately $60,000 has been
included in the proposed budget for the selected wastewater
management system to landscape the facility and provide for
wildlife habitat enhancement.
Particular attention in the Step 2 design phase of the project
will be directed to building design which will include solar
space heating and landscaping for the facilities.
Recreational features include use of 10,000 feet of the
interceptor route within the Raptor J Ranch development as a
paved bicycle/pedestrian path. Public input during the Step 2
design phase is welcomed.

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4) Snake River Wild and Scenic River Study
Problem - The section of the Snake River flowing from Teton
National Park to Palisades Reservoir is a candidate for
classification as a "Wild and Scenic River" under the
provisions of the Wild and Scenic River Act (P.L. 90-542).
The designation potential identified for this reach of the
river within South Park is "recreational." An important
criteria in the evaluation of wastewater treatment options for
the Town of Jackson was the selection of an alternative which
would not damage the potential for this designation.
Conclusion - The rapid infiltration treatment alternative
provides the best.degree of protection to Flat Creek and the
Snake River water quality. No direct discharge to the Snake
River is necessary, therefore there will not be any
interference with the stream or banks or the stream bed. The
proposed lev^l of treatment provided by the rapid infiltration
system and the projected dilution factor will be more than
sufficient to adequately protect surface water quality for the
proposed "recreational" classification currently being
considered under the Wild and Scenic River Act.

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Mitigation for the Selected Action
At such time as the Step II grant offer is tendered, the
following conditions will be appended:
1.	That the provisions agreed to in the April 13, 1978,
Tri-Party agreement are binding conditions on the Town of
Jackson, Teton County, and EPA. Said agreement in its
entirety shall be conditions to the acceptance of this
grant. One major provision of the April 13, 1978,
agreement is the completion of Teton County's and the
Town of Jackson's out-of-city tap-in provisions. This
policy statement is due to EPA prior to sewage treatment
facility operation.
According to the present schedule, these facilities
should be operational by July 1, 1980. The County and
Town are reminded that their out-of-city tap-in policy is
due to EPA by that date or earlier.
2.	EPA has determined additional ground water data is
necessary in order that the design for rapid infiltration
basins may be completed. The Town of Jackson shall
direct its consultant to obtain depth to ground water
measurements during the seasonal high (May and June of
1979), to drill a new well and run an aquifer pump test,
and to determine the rate of ground water flow by dye
tests. The minimum separation between the seasonal high
ground water and the bottom of the infiltraton basin
shall be three feet. If the additional ground water data
indicates conditions are adverse so as not to provide the
expected dissipation of effluent and thus the lower bench
site were determined to be unsuitable for rapid
infiltration, the upper bench site will be acquired by
the Town. This information shall be submitted prior to
completion of plans and specifications.

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3.	A separate landscaping and revegetation plan will be
prepared for the proposed project during Step II. The
goal of landscaping is to provide a natural setting to
reduce the visual impacts from the Snake River, the
highway and nearby private property. The goal of the
revegetation portion of the project shall be to provide
self-reproductive native vegetation of at least 50%
pre-project plant density within five years. Should
initial seeding and/or transplanting fail, the Town
agrees to be responsible for reseeding and additional
transplanting so as to meet the 50% density goal.
Maintenance of this new plant community will be a
continuing responsibility of the Town and said
maintenance shall be incorporated into the plant
operations and maintenance manual. Coordination with the
Soil Conservation Service, the Bureau of Land Management
and the Wyoming Department of Environmental Quality
Division of Land Quality is required.
4.	A separate wildlife enhancement and wildlife management
plan will be prepared for the proposed project. The goal
of the wildlife habitat enhancement element is to provide
new spawning grounds for cold water sports fish and new
habitat for waterfowl. Therefore, the dredging for the
fill material shall be planned and constructed so as to
provide maintenance-free conditions for suitable habitat
for cold water fish and migrating waterfowl. The goal of
the wildlife management element shall be to minimize
impact to migrating elk and elk wintering in the
feed-ground, minimize the impact to all sport and
non-sport animals in the area, and to reduce any wildlife
damage to the plant that might occur. All aspects of the
wildlife management plan shall conform to State game
laws. If control of certain mammals proves necessary,
preference will be given to non-lethal control methods
even if lethal methods comply with State laws. Control
methods may be necessary for damage that could result
from elk, beaver or muskrat. The wildlife management
element of this plan shall be incorporated into the plant
operations and maintenance manual. Coordination with the
Wyoming Game and Fish Department and the U.S. Fish and
Wildlife Service is required.

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Momtoring Requirements and Enforcement Program
A. Key Provisions in the April 13, 1978 Tri-Party Agreement
1. The Town of Jackson shall:
*	Submit to the County for review and approval all
structures to be built at the South Park treatment
site.
*	Begin as soon as possible to develop a new sewer
system pricing policy that incorporates a "full
cost" pricing concept for all customers for both
capital and maintenance and operations costs, and
for returning the county's capital contribution for
septic tank waste disposal facilities.
*	Consider only requests for sewer service from
out-of-city potential customers that have county
development permits and County approval for sewer
services.
*	Limit new taps to out-of-city customers so that they
will only be granted to potential customers that
have County approval and that are subject to a new
City policy of detailed criteria that determines
priorities for such connections.
The new City policy for distributing
out-of-city taps will include at least the following
classes of customers:
(1)	existing systems with health and safety
problems;
(2)	existing systems with water pollution problems;
(3)	City Expansion Area - as delineated in the
Teton County Comprehensive Plan adopted
December 6, 1977, or as amended;
(4)	old and new developments adjacent to City
1imits;
(5)	other existing developments; and
(6)	other new developments.
*	Limit the number of "out-of-city" equivalent taps,
permitted on an annual basis so they shall not
exceed the annual allowable number of "out-of-city"
taps as set forth in the comprehensive plan or as
amended.

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For the purpose of allocating these equivalent taps,
"out-of-city" taps are defined as taps allocated to
potential customers located outside the corporate
limits of the Town of Jackson as of the date of this
agreement. Such definition shall exclude any taps
located in the Expansion Area (as delineated in the
Teton County Comprehensive Plan adopted December 6,
1977, or as amended) or in any area which meets the
following requirements: (1) the area has been
annexed subsequent to this agreement or is subject
to the provisions of a written annexation agreement;
and (2) the area is adjacent to the present city
limits (i.e., situated so that the City as newly
constituted is geographically compact).
Allowances may be made for reallocating any unused
"out-of-city" taps in any one year as additional
permitted "out-of-city" taps in future years.
Existing residences outside the present City limits,
on private sewerage systems as of the date of this
agreement, may be connected to the City's system
(after receiving approval first from the County then
the City) without reducing permitted "out-of-city"
tap limits for the year in which they connect.
Take all reasonable steps to assist the County in
administering the County's Comprehensive Plan.
Take all steps legally available to assure all
elements of this agreement are enforced until at
least 1995 (approximately 15 years from completion
of new plant).

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2. Teton County shall:
*	Provide pro-rata share of facility capital cost for
appropriate receiving and processing facilities for
disposal of septic tank wastes.
*	Advise City of desired design criteria for all
structures at the South Park site.
*	Advise the City of all existing and future
developments that the County wishes to be connected
to the City's sewer system. Develop a policy and
detailed criteria for making such decisions.
*	Take the lead in further addressing rate of growth
issues in the County and develop an annual number of
out-of-city taps per year as a part of the
comprehensive plan taking into consideration fiscal
and other forms of impact upon the County, scenic
preservaton activities, schools and other urban
service systems. The development of the annual
number of out-of-city taps shall be done prior to
completion of the sewage treatment facilities.
*	Take all reasonable steps to carry out the new
County Comprehensive Plan.
*	Require all County subdivision within the City
expansion area or adjacent to the City limits that
are to be served by the City of Jackson's sewer
system to conform to development standards that meet
or exceed the City's standards.
*	Take all steps legally available to assure all
elements of this agreement are enforced until at
least 1995 (approximately 15 years from the
completion of new plant).

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3. Besides approval of the facility plan for the
lagoon/rapid infiltration system at the South Park Lower
Bench Site, EPA shall:
*	Review the City's new sewer system pricing policy
for consistency with EPA regulations and guidelines
on user fee requirements and industrial cost
recovery requirements.
*	Require an annual report (and access to
documentation of said report) of the City stating
the number and location of in-city and out-of-city
taps granted in that year.
*	Recognize goals of the County Comprehensive Plan in
making EPA decisions in the area.
*	Make funding assistance in accordance with EPA rules
and regulations to build the new plant and
interceptor, said grant to be conditioned upon full
and continued performance of this agreement for the
design life of the facility which shall be until
1995. Further, will agree to seek other sanctions
as might be necessary to assure full and continued
performance with this agreement by all parties.
Such sanctions may include, but not be limited to,
the following:
Court directed mandatory compliance with
provisions of agreement by all parties
Court directed repayment of federal sewer grant
funds
Limitation of future EPA funds to the area.

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B. Grant Conditions
The conditions defined on pages 13 and 14 shall be required
grant conditions of the Town and County. Draft plans for
conditions 1, 3, and 4 as defined on these pages will be due upon
50% completion of Step 3. Final plans for conditions 1, 3, and 4
shall be completed upon 80% expenditure of Step 3 construction
grant funds.
C. Permit Limitations and Ground Water Monitoring
Average Effluent Concentration Limitations
Parameter
BOD5 - mg/1
Total Suspended
Solids - mg/1
Fecal Coliform -
number/100 ml
May 1 to September 30
Total Residual
Chlorine - mg/1
Ammonia Nitrogen -
mg/1 (as N)
Ammonia Nitrogen -
lb/day (as N)
30 Consecutive
Day Period
30
50
1500
7 Consecutive
Day Period
45
75
3000
Instantaneous
May 1 to Oct. 14
10
292
0.05
Oct 15 to April 30
25
365
pH - units
Shall remain between 6.0 and 9.0

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There shall be no discharge of wastewater effluent to the
receiving stream (Flat Creek) during the period from May 1 to
October 14 of each calendar year. There shall be no direct
discharge to the receiving stream during the period from October
15 to April 30 of each calendar year unless one or more of the
following conditions exists and can be documented:
1.	Climatic conditions have reduced the infiltration and/or
percolation rates to a degree which will prevent all of
the effluent from being disposed of on the
infi1tration/percolation basi ns;
2.	Valves or piping to or in the infiltration/percolation
basins that become inoperable due to freezing or frozen
effluent conditions;
3.	Severe wintertime climatic conditions such that the
physical integrity of the infiltration/percolation basins
or appurtenances would be threatened by their continued
use under these conditions. This can include but is not
limited to rupture of valves or piping as a result of
effluent freezing.
Ground water monitoring wells shall be constructed so as to
provide a self monitoring data base of ground water conditions.
Such monitoring is to include the following:
Total BOD5, mg/1	Weekly	Grab
Total Suspended	Weekly	Grab
Solids, mg/1
Fecal Coliforms,	Weekly	Grab
number/100 ml
Depth to Ground-	Weekly	Instantaneous
water, feet
Ammonia Nitrogen,	Weekly	Grab
mg/1 (as N)
Total Nitrogen,	Weekly	Grab
mg/1 (as N)

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BIBLIOGRAPHIC DATA
SHEET
1.
&E?-V(ift/5-79-001C
2.
J. Hecipicnt's Accession No.
4. Title and Subtitle
Record of Decision
Jackson Wastewater Treatment System
Town of Jackson, Wyoming	
5. Report Date
April 20, 1979
6.
8W-EE
7. Author(s)
Weston W. Wilson, EPA
8. Performing Organization Rept.
No.
9. Performing Organization Name and Address
U.S. Environmental Protection Agency
Region VIII
1860 Lincoln Street
Denver, Colorado 80295	(303) 837-4831
10. Projecr/Task/Work Unit No.
11. Contract/Grant No.
12. Sponsoring Organization Name and Address
U.S. Environmental Protection Agency
Region VIII
1860 Lincoln Street
Denver, Colorado 80295	(303) 837-4831
13. Type of Report & Period
Covered
Final
14.
15. Supplementary Notes
Summary Draft Environmental Impact Statement dated May 1, 1977 EPA 908/5-77-002
Final EIS dated February 12, 1979 EPA 908/5-79-00A and EPA 908/5-79-001B
16. Abstracts
This is a record of the decision for proposed construction of additional wastewater
treatment facilities at Jackson Hole, within Teton County, Wyoming. The U.S.
Environmental Protection Agency (EPA), Region VIII, Denver, under the authority of
Section 201 of the Federal Water Pollution Control Act Amendments of 1972, is
authorized to grant 75 percent matching funds for construction costs of designated
wastewater treatment facilities. Sewage discharges as a result of area growth and
development together with non-point source runoff have degraded the water quality
of Flat Creek. Therefore, additional sewage treatment facilities are needed to
meet water quality goals.
The approved action is to construct aerated lagoons followed by rapid infiltration
basins 4 miles downstream of the existing plant. The new facility will enhance
development in the undeveloped South Park area. Groundwater monitoring will be requirejd
17. Key Words and Document Analysis. 17a. Descriptors
Sewage Disposal
Rapid Infiltration Basins
Infiltration/percolation
Environmental Impact Statement
Sewage Irrigation
Water Pollution
Regional Planning
Financing
17b. Identifiers/Open-Ended Terms
Jackson Hole Scenic Area
Snake River Wild and Scenic River Study
17c. COSATl Field/Group
18. Availability Statement
Release Unlimited
19, Security Class (This
Report)
UNCLASSIFIED
20. Security Class (This
Page
UNCLASSIFIED
21. No. of Pages
22
22. Price
form NTCS-3S iREv. 10-73) ENDORSED BY ANSI AND UNFSCO
THIS FORM MAY BE REPRODUCED
USCOMM- DC B283-P74

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