HomeMy WebLinkAbout20061765.tiff NORTH FRONT RANGE WATER QUALITY PUNNING ASSOCIATION
Civic Center, 500 E. 3f°Street, Loveland, CO 80537
970.962.2785—970.962.2913 fax
nfrwgpa@frii.com—www.nfrwqpa.orq
June 21, 2006
Mike Geile
Weld County Commissioner
PO Box 758
Greeley, Colorado 80632
RE: Areawide Water Quality Management Plan Amendment
Dear Commissioner Geile:
The North Front Range Water Quality Planning Association (NFRWQPA) has received
two requests to amend the 2005 Update to the Areawide Water Quality Management Plan
which was approved in March 2006. The first request is from the Town of LaSalle to
amend their existing service area to include land which has recently annexed. This
request was originally made to NFRWQPA during the 2005 Update process, but due to
an oversight, was not included in the final approved update. A revised map including the
additional service area is included for your review.
The second is a joint request from both St. Vrain Sanitation District (SVSD) and Dacono
Sanitation District (DSD)to amend their existing service area boundaries. The two
districts have developed an IGA that would move much of the existing service area for
DSD into that of SVSD. The"old town" area of Dacono would remain part of DSD and
continue to be served through an agreement with Weld County Tri-Area Sanitation
District. I have enclosed a draft map and language that would reflect these changes.
Please review the enclosed information and respond at your earliest convenience with any
comments or concerns you may have with these requests. These amendments will be
scheduled for review and discussion by the NFRWQPA at the August Association
meeting. A public hearing to consider the amendments will be scheduled following the
August meeting.
Sincerely,
Connie O'Neill
Manager
Enclosures: (3)
'' �� pc eA Comm uyres/-.9 t 2006-1765
_______x
29TH ST
I < _
x
n 24 9 f/ 20 c
34TH ST
r VCR 54 ®;_y-K -�
< /� i r
,
x
'26 m 25 39; 29 28
I
C
. f 33
' ., _ ,
r '5N / ` 4 TODD AV
1 E+
r
,_ z 1.
i a,
m iIn sr
--_I---- /5
.C...... _/1 c4 do- .. 4-
i .-
O 3
r
^
11 /_ 8�' 9
� 0
1 % 13 18 17 16
i5 .
Treatment Plants 208-Proposed LA SALLE
0 maor 1—..,..3lASALLE
WI Minor EVANS 0 1 2gil
® Industrial GREELEV I Miles
June 2006
DACONO SANITATION DISTRICT/ ST. VRAIN SANITATION DISTRICT
PLAN AMENDMENT REQUEST
The Dacono Sanitation District and the St. Vrain Sanitation District have made a joint request to
amend the 2005 Update to the Water Quality Management Plan. The amendment would affect
the basin language, data sheets, and service area maps for both entities. Revised language for the
basin and data sheets is included below. Service area maps are included as separate documents.
Dacono Sanitation District
The Dacono Sanitation District provides only wastewater collection service to a portion of the
City of Dacono that falls within its current service area boundary. The District contracts with the
Weld County Tri-Area Sanitation District (WCTASD) for treatment and disposal of the
wastewater from this area which is in and adjacent to the old town of Dacono and can flow by
gravity to the WCTASD facility. The service area for the District has in the past included the
current service area along with several square miles to the south which were part of the City of
Dacono's Planning Area. As part of the 2005 Update to the Water Quality Management Plan,
the District expanded that service area three miles to the east, to Weld County Road 21, which
encompasses an expanded Development Area for the city. Following the 2005 Update, the
District established an IGA with St. Vrain Sanitation District (SVSD). This IGA resulted in a
plan amendment in which the majority of District's service area (a total of 12,160 acres) was
incorporated into that of SVSD with the exception of the old town area currently being treated by
WCTASD. This area was adjacent to the service area of SVSD and included large parcels that
were prepared to develop. SVSD is currently studying the various options of moving effluent to
the plant from the newly incorporated area, including connecting to current underused capacity
lines with the use of lift stations and force mains.
St. Vrain Sanitation District
The St. Vrain Sanitation District (SVSD) was created in 1986 to serve the area near the
intersection of 1-25 and State Highway 119, commonly referred to as Del Camino, and the
surrounding areas. The District's secondary sewage treatment plant was constructed in 1987,
along with a core collection system. This resulted in the elimination of 3 small treatment
facilities in the Del Camino area. Five major line extensions along with numerous sub-division
collection systems have been subsequently completed. As of August 2005, there were
approximately 12,730 acres included within the District boundaries. Connections to the system
at that time included 3,600 residential taps, a 210—unit mobile home park, and 122 commercial-
industrial tap, totaling 5,201 single family equivalents.
During the 2005 Update to the Areawide Water Quality Management Plan, the District added
several square miles to their service area. Following the 2005 Update, the District established an
IGA with Dacono Sanitation District (DSD). This IGA resulted in a plan amendment in which
the majority of DSD's previous service area (a total of 12,160 acres) was incorporated into that
of SVSD with the exception of the old town area of Dacono currently being treated by Weld
County Try-Area Sanitation District (WCTASD). This newly incorporated area was adjacent to
the previous service area of SVSD and included large parcels that were prepared to develop. In
addition, the District also included area north of Highway 52 and east of the WCTASD service
area. The District is currently studying the various options of moving effluent to the plant from
the newly incorporated area, including connecting to current underused capacity lines with the
use of lift stations and force mains. Eventually, SVSD plans to build the necessary new lines to
connect the area to the treatment plant.
The District's treatment plant is also four miles down gradient from the WCTASD's treatment
works. The potential exists for future consolidation with this facility as well, which would
include treatment of wastewater from WCTASD as well as the remaining DSD. In addition, the
City of Longmont projects that it may need to construct additional treatment capacity after 2020
either at their existing plant or a new plant down gradient of the existing Longmont plant and
within the SVSD service area. The District presently serves a small portion of Longmont located
in Weld County.
The District's wastewater treatment plant was converted from a 0.5 mgd aerated lagoon system
to a mechanical plant with 3.0 mgd capacity (two 1.5 mgd extended aeration lagoon and clarifier
modules) in April 2002. Flows generated from the newly incorporated area have the potential to
be between 6.894 mgd and 9.192 mgd from an estimated total build out population of 50,000. In
2005 the District completed a master plan which includes four major line extensions and
upgrading the plant to 5 mgd by 2009 and further expanding to 15-20 mgd by 2030. A rate
study is also being completed. The District feels they are in a position to be a provider of
regional service to communities in the area seeing expansion and could readily serve additional
areas up-gradient of the service area with gravity sewers.
•
NFRWQPA 2005 WATER QUALITY PLAN UPDATE
Major Point Source Inventory Data
Operating Agency: Dacono Sanitation District
NPDES Permit#: NA Permit Expires: NA
Description of Treatment Facilities: Collection system to transport sewage to the Weld County
Tri-Area Sanitation District treatment facilities.
Treatment Facility Location: NA
Discharge Location: NA
Stream Segment Classification: NA
Service Area Population:
Existing 2010 2015 2020 2025
, 3,900 5,400 5,400 5,400 5,400
Note: It is estimated that the area served by Dacono Sanitation District will reach a build out
population of approximately 5,400 people by 2010.
Capacities:
Design Existing 2010 2015 2020 2025 Year at Year at
Capacity Load 80% 95%
Design Design
Flow(mgd) NA 0.43 0.6* 0.6* 0.6* 0.6* NA NA
Organic NA NA NA
(lbs./day
BOD5)
* projected peak flows
Biosolids treatment and disposal: NA
Effluent limits required beyond secondary to meet stream standards: NA
Estimated 5-year construction needs: Weld County Tri-Area Sanitation District (WCTASD) and
St. Vrain Sanitation Districts (SVSD) are considering an IGA that would transfer flows from the
WCTASD as well as Dacono Sanitation District to the SVSD plant for treatment. Should such
an agreement be developed, the three districts would need to work together on any necessary
improvements.
NFRWQPA 2005 WATER QUALITY PLAN UPDATE
Major Point Source Inventory Data
Operating Agency: St Vrain Sanitation District
NPDES Permit#: CO-0041700 Permit Expires: 6/30/2010
Description of Treatment Facilities: The plant has been converted to a mechanical system. It
includes headworks trash removal, two 1.5 mgd extended aeration lagoon and clarifier modules,
ultra violet disinfection, and solids storage and handling facilities utilizing two lagoons from the
original plant.
Treatment Facility Location: NW '/a, SE '/, Section 31, T3N, R67W
Discharge Location: Oxbow Lake then to St. Vrain Creek, NW '/a, SE 1/4, Section 31, T3N,
R67W.
Stream Segment Classification: Oxbow Lake: St. Vrain Segment 06, Warm Water Aquatic Life
Class 2, Recreation Class la, and Agriculture. St. Vrain Sub-basin Segment 03, Warm Water
Aquatic Life Class 2, Recreation Class la, and Agriculture
Service Area Population: estimated population equivalents
Existing 2010 2015 2020 2025
11,000 23,562 32,844 42,126 51,408
Capacities:
Design Existing 2010 2015 2020 2025 Year at Year at
Capacity Load 80% 95%
Design Design
Flow (mgd) 3.0 1.0 2.325 3.272 4.172 5.082 2011 2013
Organic 5,755 2,100
(lbs/day
BOD5)
Biosolids treatment and disposal: Sludge handling facilities will need to be expanded within 5
years.
Effluent limits required beyond secondary to meet stream standards: Total Ammonia(as N)
varies monthly.
Estimated 5-year construction needs: As a result of the IGA with Dacono Sanitation District,
the plant is expected to reach 80% design and 95% construction as early as 2011 and 2013
respectively. Additionally, there is the potential for IGAs with Weld County Tri-Area Sanitation
District (WCTASD) and the proposed East I-25 Sanitation District for treatment of their
wastewater. There is also the possibility that the Town of Mead will ask the District to treat its
wastewater as an alternative to constructing a new plant. The WCTASD and DSD agreements
would require a major interceptor. Additionally, four major line extensions and the paralleling of
the Godding Hollow line are planned. A WWTF Master Plan was completed in September 2005
describing future plant expansion up to 20 mgd capacity. Upgrading the facility to 5 mgd is now
scheduled for 2009 and further expansion to 15 mgd by 2030. The present plant site is adequate
size for any foreseeable plant expansion.
y � 6 5 4 3 2 1 6
I ID
x.
D � "1 'fi'T � } I {l
1 II r y. ar 15
Wb
oI ,
1
/
19 20 21 ' ti� 22 23 24
.t }
i I a< Z '
29 h 7 26 1b 3 30 ,i 29 :4827 26 25
�.y��SI - t �_J I
0 K1 33i 34 n26 i 31* (32 3r3QJN -'- w f T2� !� 4�t voo3T3.33 LJ 21 65 3 2 11
? II _ A HWAp9 Y N NR / I WL8'Sfi
fi
it
9 10 1 �` 7 8 �9- '1 10 11 12/c 18 17` i6 (�%15� 14, 13� 18 X17 16 018 15 I 14 13 18
i /'� th U 3 / il
wwm A e
a
0 19 2➢ r"21 22 19 20 21 22 231 �({ 4
uanerrnYz,
v i I I. �
.. � �H.,p — -�z z� 6k, is 30 i 29 Aa 27 � zfi (.4 \.....1)
a
} )WCR1�Ifi 19T 61'a
82 34 I 35 Y 61 Eq �2 -3334
m 3
\ NMY fig •• T,N N�9V 51 D. TT
/
TIN I
3 1�
m 5 � a 2 1. j}m�3
V
7 () 11 \ 12 . 7 $f 9 3 10 1 12 C‘,
7
n
N• C m r
L 77 1 15 14 13 3 18 17 -_ 46 15 1' 13 1
/
WCRB _^O
1 t j �21 ••22•_{�• 23 �za 1s zo r.T.. ara1. 23� za l 1.„215—,:IL-1
28 27 28 30 ° 27 2� 25
Treatment Plants 208-Proposed I ERIE MILLIKEN ST. VRAIN S.D.
. Major i.......1 ST VRAIN S D .'� FORT LUPTON 01.4PLATTEVILLE
hig Minor +BROOMFIELD LONGMONT WELD COUNTY TRI-AREA S.D.
0 1 2
a Industrial DACONO S . L9 ;!I MEAD CI Miles
June 2006
Hello