HomeMy WebLinkAbout2.0 Staff ReportREOUEST:
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*PC 8/14/96
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PROJECT INFORMATION AND STAFF COMMENTS
Site Application for Approval for
Expansion of Domestic Wastewater
Treatment Works
APPLICANT: Spring Valley Sanitation District
ENGINEERS: Schmueser Gordon Meyer, Inc.
LOCATION: A site located in the NE1/4NE1/4
Section 9, T7S, R89W; generally
located approximately 4 miles
southeast of Glenwood Springs, off
of County Road 114 and located on
the CMC campus.
I. RELATIONSHIP TO THE COMPREHENSIVE PLAN
The Garfield County Comprehensive Plan of 1995 identifies this area of the
treatment facility a Public Institution, based on the Colorado Mountain College
campus location.
II. DESCRIPTION OF THI. PROPOSAL
It is proposed to expand the Spring Valley wastewater treatment facility approved
flow capacity of 52,000 gpd to 153,700 gpd. The existing facility is treating
effluent for 148 EQR or the equivalent of 51,800 gpd, based on the standard of
350 gpd/EQR. The applicant's engineer has stated that the actual flow rates have
been around 270 gpd/EQR, reducing the actual daily treatment to 39,960 gpd.
(See application pgs. )
The District is proposing to expand the treatment facility to an equivalent
population of 1537 people or 153,700 gpd treatment capacity. The need for the
expansion is based on projected development that will occur in the Los Amigos
PUD and on the CMC Roaring Fork campus. (See application summary pgs 6 -
// ) The expansion would convert an existing non-aerated cell into an aerated
cell, the present percolation pond into a settling pond and adding "one or more
new percolation ponds". The facility would not have any surface discharge, but a
goundwater discharge permit will be required prior to the use of the new facility.
• •
III. MAJOR ISSUES AND CONCERNS
A. State Statutes: C.R.S. 25-8-702, 1981, defines the parameters by which
the Colorado Department of Health, Water Quality Control Division can
review and approve or deny a site application for sewage treatment works
(See application form included in overall application). The applicant is
required to obtain a recommendation of approval, denial or no comment
from the County Planning Commission, County Board of Health, County
Board of County Commissioners and various other local and regional
agencies.
Garfield County's involvement in the process is to determine whether or
not the proposed wastewater treatment works are consistent with "the
long-range comprehensive plan for the area as it affects water quality and
any approved regional wastewater management plan for the area". The
Comprehensive Plan identifies the CMC campus as a Public Institution
and recognized the Los Amigos PUD as an area for future development.
Portions of the Los Amigos PUD and the CMC campus are projected to
expand at a future date and will need to have sewage treatment facilities
capable of meeting the new demand. (See Exhibit 2 pg. - /d
Ultimately, the Colorado Department of Health and Water Quality Control
Commission will determine whether or not the proposed wastewater
treatment facility and site are appropriate as proposed. The Garfield
County Comprehensive Plan provides some guidance in terms of
developers connecting into existing systems "when economically
feasible". It would appear that it is economically infeasible to construct an
interceptor to the Aspen Glen Metropolitan District system due to the
increased cost of extending a sewer line to a facility that presently does
not include the Spring Valley Sanitation District in its projected service
area. So, in terms of the Comprehensive Plan policy, the proposed site
meets the intent. In terms of the Plan objective to "discourage the
proliferation of private water and sewer systems and special districts", the
proposed facility was an existing site at the time the Comprehensive Plan
was developed.
Staff Comment: The sewage treatment facility is located on the CMC
campus, yet the college is not in the district boundaries. This makes no
sense since the college is one of the larger users of the facility and is
subject to the determinations of a Board of Directors having no direct
interest in the college or its facilities.
VI. RECOMMENDATION
That the Planning Commission recommend approval of the site application with
no additional comment.
• •
COLORADO DEPARTMENT OF HEALTH
Water Quality Control Division
4210 East llth Avenue
:Denver, Colorado 80220
APPLICATION FOR SITE APPROVAL FOR CONSTRUCTION OR EXPANSION OF:
A) DOMESTIC WASTEWATER TREATMENT WORKS (INCLUDING TREATMENT PLANTS,
OUTFALL SEWERS, AND LIFT STATIONS) OVER 2,000 CPD CAPACITY.
B) INTERCEPTORS (IF REQUIRED BY C.R.S. 25-8-702 (3))
APPLICANT: Spring Valley Sanitation District
ADDRESS: c/o Greg Boecker, Chairman 2929 County Road 114,gpr1ngs, COPHONE: 970-945-6399
Consulting Engineer's Name and Address: Schmueser Gordon Meyer, Inc.
118 West 6th Street, Suite 200, Glenwood Springs, CO 81601 PHONE: 970-945-1004
A. Summary of information regarding new sewage treatment plant:
1. Proposed Location: (Legal Description) NE 1/4, NE 1/4, Section 9
Township 7S , Range 88W ,
Garfield County.
2. Type and capacity of treatment facility proposed: Processes Used Aerated lagoon,
effluent chlorination, percolation ponds(s).
Hydraulic 153,700 gpd Organic 307
gal/day lbs. BODS /day
Present PE 520Design PE 1,537 % Domestic 100 X Industrial 0
3. Location of facility:
Attach a map of the area which includes the following:
(a) 5 -mile radius: all sewage treatment plants, lift stations, and domestic
water supply intakes.
(b) 1 -mile radius: habitable buildings, location of potable water wells, and
an approximate indication of the topography.
4. Effluent disposal: Surface discharge to watercourse
Subsurface disposal X Land
Evaporation X Other
State water quality classification of receiving watercourse(s)
N/A
Proposed Effluent Limitations developed in conjunction with Planning and Standards
Section, WQCD: BOD5 mg/1 SS mg/1 Fecal Coliform /100 ml
Total Residual Chlorine
mg/1 Ammonia mg/1 Other
5. Will a State or Federal grant be sought to finance any portion of this project? No
6. Present zoning of site area?
ARRD
Zoning with a 1 -mile radius of site?
See Exhibit 3 attached
7. What is the distance downstream from the discharge to the nearest domestic water
supply intake? 30 miles, Town of Silt
(Name of Supply)
P.O. Box 70, Silt, CO 81652
(Address of Supply)
What is the distance downstream from the discharge to the nearest other point of
diversion? One mile Staton Ditch/Union Ditch Union Oil Company, Real Estate
(Name of User)
Division, 4289 County Road 215, Parachute, CO 81635
(Address of User)
WQCD-3 (Revised 8-83)
• •
8. Who has the responsibility for operating the proposed facility?
Spring Valley Sanitation District (SVSD)
9. Who owns the land upon which the facility will be constructed?
Colorado Mountain College (CMC)
(Please attach copies of the document creating authority in the applicant to
construct the proposed facility at this site.)
10. Estimated project cost: $280,000
Who is financially responsible for the construction and operation of the facility?
Spring Valley Sanitation District
11. Names and addresses of all water and/or sanitation districts within 5 miles
downstream of proposed wastewater treatment facility site.
Aspen Glen Water & Sanitation District
9929 State Highway 82
Carbondale, CO 81623
(Attach a separate sheet of paper if necessary.)
12. Is the facility in a 100 year flood plain or other natural hazard area? No
If so, what precautions are being taken?
Has the flood plain been designated by the Colorado Water Conservation Board,
Department of Natural Resources or other Agency?
If so, what is that designation?
(Agency Name)
13. Please include all additional factors that might help the Water Quality Control
Division make an informed decision on your application for site approval.
Expansion of existing facility. Expansion to service dormitories being
constructed on Colorado MountainCollege Spring Valley Canrous, as well as
to address future service needs of Sanitation District.
B. Information regarding lift stations:
1. The proposed lift station when fully developed will generate the following additional
load: Peak Hydraulic (MGD) P.E. to be served
2. Is the site located in a 100 year flood plain?
If yes, on a separate sheet of paper describe the protective measures to be taken.
3. Describe emergency system in case of station and/or power failure.
4. Name and address of facility providing treatment:
5. The proposed lift station when fully developed will increase the loading of the
treatment plant to
X of hydraulic and X of organic capacity and
(Treatment Agency)
agrees to treat this wastewater? Yes No
Date Signature and Title
-2-
WQCD-3 (Revised 8-83)
• •
C. If the facility will be located on or adjacent to a site that is owned or managed by a
Federal or State agency, send the agency a copy of this application.
D. Recommendation of governmental authorities:
Please address the following issues in your recommendation decision. Are the proposed
facilities consistent with the comprehensive plan and any other plans for the area,
including the 201 Facility Plan or 208 Water Quality Management Plan, as they affect water
quality? If you have any further comments or questions, please call 320-8333, Extension
5272.
pate
Recommend Recommend No
Approval Disap r v Comment Signature of Representative
1.(p- 01 Co
2.
3.
4.
5.
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Local Government: Cities or Towns (It
site is inside boundary or within three
miles) and Sanitation Districts.
Board of County Commissioners
Local Health Authority
City/County Planning Authority
6.
Council of Governments/Regional Planning
7.
State Geologist
(For lift stations, the signature of the State Geologist is not required. Applications for
treatment plants require all signatures.)
I certify that I am familiar with the requirements of the "Regulations for Site Applications
For Domestic Wastewater Treatment Works," and have posted the site in accordance with the
regulations. An engineering report, as described by the regulations, has been prepared and is
enclosed.
DATE CD (.0
Signature of Applicant TYPED NAME
WQCD-3 (Revised 8-83)
• •
SPRING VALLEY SANITATION DISTRICT
ATTACHMENT TO SITE APPLICATION
SERVICE AREA DEFINITION
Exhibit 1 is a map of the existing boundary of the Spring Valley Sanitation District
(SVSD). The immediate service area is the boundary of the SVSD as well as the Colorado
Mountain College (CMC) Campus and the Pinyon Pines Apartments. The expanded service
area for the wastewater treatment facility on shown in Exhibit 1 and includes portions of the
Los Amigos Ranch property in the vicinity of the current SVSD boundary. While it is
anticipated that this expanded flow would provide future service to CMC and Los Amigos
Ranch Partnership (LARP), it is not the intent of this Site Application to preclude adjacent
properties in the Spring Valley area from being annexed into the service area of the SVSD.
Population and Flow Projections
Exhibit 2 is a table indicating both current and projected population and flow for SVSD.
A summary of the projections follows:
Standard
EQR
- Population equivalent, P.E. = 3.5 persons/EQR
- Flow equals 100 gpd/PE
BODS = 0.2 ppd/PE
The above table is based on an equivalent flow rate of 350 gpd/standard EQR. Past
flow studies performed at the existing facility indicate that actual flow rates are approximately
270 gpd per connected EQR. Therefore, the actual number of connected EQRs that can be
served by the existing and proposed treatment facility are 192 EQR and 603 EQR,
respectively.
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June 1, 1996
• •
Relationship to Other Water & Wastewater Treatment Plants
Exhibit 3 shows the SVSD boundary and surrounding area. The Town of Carbondale
wastewater treatment facility and the Aspen Glen Metropolitan District wastewater treatment
facility are shown on that map. There are no water treatment facilities within the vicinity
shown on the map. The relationship to these treatment facilities is further discussed under
treatment alternatives considered below.
PROPOSED EFFLUENT LIMITATIONS
The current facility and the proposed facility utilize percolation ponds for discharge of
effluent. There are no surface water discharges associated with this facility.
This facility has not been issued an NPDES discharge permit to date. A discharge
permit will be submitted for this facility upon approval of Site Application.
ANALYSIS OF EXISTING FACILITIES
Exhibit 4 is a site plan of the current facility. The current facility consists of the
following:
• Influent Parshall flume with a continuous flow measurement (CMC flow only).
• Influent Parshall flume without flow measurement facilities (entire flow).
• Pond #1 - Aerated lagoon cell.
• Pond #2 - Non-aerated cell.
• Pond #3 - Percolation pond.
• Monitoring wells (2).
Influent and effluent flow measurement or testing has not been done on an ongoing
basis for this facility. This facility has never gone septic. There have never been any
overflows of the percolation ponds. The flow monitoring wells have never had any
groundwater standing in them. The facility has been monitored weekly for the past 13 years
and, to the best of my knowledge, this facility has functioned within expected performance
parameters.
Exhibit 5 is a set of design calculations for the existing facility. The current Site
Application indicates an approved flow capacity of 52,000 gal/day, consistent with the design
calculations.
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June 4. 1996
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• •
TREATMENT ALTERNATIVES CONSIDERED
An extended aeration facility was considered as an alternative to the aerated lagoon
system. Because of the fact the District has sufficient land area for additional percolation
cells, the fact that the aerated lagoon system is essentially currently in place and the operation
and maintenance of the existing system is far Tess than the equivalent operation and
maintenance cost for a mechanical treatment facility, this alternative was not considered
further.
The Aspen Glen Metropolitan District wastewater treatment facility is currently under
construction and scheduled for completion in 1996 - See Exhibit 3 for location. There have
been two recent studies investigating the feasibility of the elimination of a treatment facility
at the SVSD site and constructing an interceptor sewer to Aspen Glen facility. Exhibit 6
contains excerpts from the Wastewater Management Study, Lower Roaring Fork Planning
Area, dated April 23, 1993, which is the planning document associated with the formation
and preparation of Service Plan for the Aspen Glen Metropolitan District. That plan concluded
that it was not feasible to abandon the SVSD system from a cost standpoint. That conclusion
was reached despite the fact that study analyzed a more costly activated sludge facility for
a Spring Valley Sanitation District on-site expansion versus an aerated lagoon facility
expansion. The study concluded that an on-site system would cost $ 1 .1 million versus a
connection to the Aspen Glen regional facility of $1.8 million.
Exhibit 7 is an excerpt from a report entitled, Feasibility Study, Sanitary Sewer
Connection to Aspen Glen Regional Wastewater Treatment Plant, dated October, 1995. That
report was commissioned by CMC. That report concluded that the cost for connection to the
Aspen Glen facility would be on the order of $2.2 million.
Both reports indicate that it is not feasible for connection to the Aspen Glen
wastewater treatment plant, and the Colorado Department of Health has subsequently issued
a Site Application approval for the Aspen Glen facility which does not include the SVSD within
the service area.
FLOODPLAIN AND NATURAL HAZARD ANALYSIS
The treatment facility is not located in the flood hazard area. There are no natural
hazards at the site.
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June 4, 1996
• •
DETAILED DESCRIPTION OF SITE
Treatment Svstem Description
Exhibit 8 is a site plan indicating the proposed facilities. Those facilities will consist
of the following:
• Influent Parshall flume and influent flow measuring facilities (CMC flow only).
• Influent existing Parshall flume with proposed influent flow measuring facilities
(entire flow).
• Pond #1 - Aerated cell.
• Pond #2 - Aerated cell.
• Pond #3 - Settling pond.
• Pond #4 - One or more new percolation ponds.
• Chlorination facilities with the chlorination point between settling pond and
percolation pond(s).
• Two (2) existing monitoring wells supplemented by two (2) additional
monitoring wells.
Exhibit 9 is the design calculations for the proposed facilities.
Design Capacity
As shown in Exhibit 2 and discussed above, the projected capacity facility will be
153,700 gpd.
Operational Staffing Needs
Current staffing for the District consists of a single part time operator. Current
operation requirements are approximately eight hours per week. It is anticipated that
operational needs will increase to approximately 16 hours per week as a result of increased
capacity of the system.
Legal Description of Site
Exhibit 11 is a legal description of the site.
LEGAL ARRANGEMENTS
Exhibit 11 is the legal description of the site. The site is leased by the Sanitation
District from Colorado Mountain College pursuant to a 50 -year lease with an automatic 50-
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June 4, 1996
• •
year renewal right for the Sanitation District. Exhibit 10 is a copy of the Lease and
Agreement.
INSTITUTIONAL ARRANGEMENTS
SVSD operates under the original Service Plan, dated July, 1979.
Exhibit 11 is a copy of the legal description of the SVSD as originally organized under court
order, dated January 9, 1980, under Civil Action #79 CV 223.
This facility operates under the following three (3) Site Applications, contained as
Exhibit 11, and summarized as follows:
• Site Application #3278, July 11, 1979, the initial Site Application for the site.
This was actually an Amended Site Application which authorized the installation
of aeration equipment in the first cell. It is not known whether a Site
Application was issued for construction of the original facility in the 1960's.
• Site Application #401 5, February 6, 1992, issued for the construction of a lift
station on the CMC campus.
• Site Application #3278, May 11, 1994, which authorized the construction of
the current perce'::�n ce'I, which is the third cell at the site.
MANAGEMENT CAPABILITIES
CMC is not located within the boundaries of the SVSD. Exhibit 13, Sewage Treatment
Service Agreement, July 2, 1979, between Colorado Mountain Junior College District and the
owners of Los Amigos Ranch PUD, the predecessor to the Spring Valley Sanitation District,
is attached. This exhibit is the operating agreement between CMC and SVSD which
agreement was assumed by SVSD in the Lease Agreement between CMC and SVSD, attached
as Exhibit 10. See page 4 of lease.
Further management authority is outlined in the Service Plan for the SVSD and in other
agreements between SVSD and CMC.
FINANCIAL SYSTEMS
Exhibit 14 is the 1996 budget for the SVSD.
The expansion of the wastewater treatment facility will be paid for by pre -payment of
tap fees by CMC and/or other potential users. Those funds will be made available to the
SVSD prior to start of construction. Based on the final agreement to be negotiated between
DWG:Iec\1503A01. apl
June 4, 1996
• •
SVSD and CMC with respect to recapture of the pre -payment of tap fees, the tap fee will be
adjusted if necessary to provide for such recapture.
It is anticipated that the ongoing operating revenue streams of the Sanitation District
will be monitored on an annual basis in order to provide, as in the past, for operation and
maintenance of the capital improvements throughout the District.
IMPLEMENTATION PLAN
The anticipated construction schedule is as follows:
• Site Application Submittal - July 1, 1996.
• Department of Health approval of Site Application - October 1, 1996.
• Begin construction - April 1, 1996.
• Complete construction - July 1, 1997.
• NPDES discharge permit received - January 1, 1997.
• Start-up date - July 1, 1997.
The estimated cost of construction is as follows:
• Flow measurement $ 9,000
• Site work $160,000
• Mechanical equipment $ 43,000
• Monitoring wells $ 12,000
SUBTOTAL $224,000
25% Contingency, engineering and legal fees $ 56,000
TOTAL ESTIMATED CONSTRUCTION COST $280,000
DWG:Iec11503A01 .api
June 4, 1996
EXHIBIT 2
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PROJECTED TOTAL
Population
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1.0 EQR/SF II
3.7 EOR/100 students
Students/staff 3.7 EQR/100 students
Apartments 0.3 EQR/bed_
Dormitory beds 0.25 EQR/bed
St ff housing Varies
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School Stte
Commercial 1.0 EQR/2000 SF
SUBTOTAL, LOS AMIGOS RANCH
COLORADO MOUNTAIN COLLEGE
SUBTOTAL, CMC --
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