HomeMy WebLinkAboutFile Documents.234 W Francis St.0118-2020-BRES (32) STORMWATER BMP
OPERATIONS AND MAINTENANCE PLAN
FOR
234 WEST FRANCIS STREET
CITY OF ASPEN, COLORADO
PARCEL ID: 273512417003
PREPARED BY:
High Country Engineering, Inc.
1517 Blake Avenue, Suite 101
Glenwood Springs, CO 81601
(970) 945-8676
January 10, 2025
HCE JOB NUMBER: 2191025.00
A. Introduction
This manual shall detail stormwater BMP operations and maintenance for 234 West
Francis Street, City of Aspen, Colorado.
B. Site Description and Drainage Pattern
Stormwater management facilities for the improvements at 234 West Francis Street
consist of conveyance and detention/treatment BMP's in accordance with the City of Aspen
Urban Runoff Management Plan(URMP). Runoff from all impervious areas onsite is directed to
a drywell in the south lawn between the main residence and cabin for detention and treatment.
Catch basins, slot/trench drains and roof downspouts have piped connections via storm sewer
and are routed to the drywell. All conveyance facilities have been sized to safely convey the
100-year storm event.
The storm sewer system from the patio is a redundant dual pipe system that will prevent
overflow of the patio area should either of the pipes be clogged. The system overflow is an inlet
located north of the cabin and southeast of the spa. This provides an overflow route that surface
drains along historic drainage patterns along the alley northeast of the site, ultimately to North 1st
Street. The location of stormwater BMP's located onsite can be referenced in the as-built survey
included as Appendix A.
C. Site BMP Maintenance
The following Best Management Practices (BMPs) shall be implemented to prolong the
life of the storm water infrastructure and to assure that the drainage facilities are functioning
properly. Below is a list of BMPs constructed as part of the proposed site improvements. Refer
to the As-Built plan by High Country Engineering for locations of drainage facilities.
1. Mowing, trimming, and weed control shall be performed on a regular basis throughout the
growing season. Mowing shall keep the grass to a length of no longer than six inches.
Trimmings shall be picked up and removed from the mowed area or a bagging system shall
be used. A mulching lawnmower may also be used.
2. All drainage facilities shall be inspected for damages on an annual basis. If structures are
damaged to a point that they cannot function properly,then the structure must be replaced.
3. Leaves and debris shall be removed from the roof drainage system in the spring,after snow
melt and in the fall once the trees have lost their leaves to prevent clogging. If the roof
gutter system and drain pipes are functioning properly,water will not back up in the gutters
and overtop them. Storm water shall be routed to the drywell where most runoff will
percolate into the soils. Roof drains and pipes shall be cleaned by using a brush system or
a hose to flush out debris. Storm pipes and roof drains may need to be jetted with a high-
pressure water system to remove any clogged debris. Area drains must also be inspected
to make sure debris has not accumulated. These may require water jetting to adequately
clean these lines.
4. Inlets and catch basins shall be inspected in the spring and after major storm events for
debris and cleaned as needed.
5. Swales should be kept mowed or raked smooth and must not be filled with dirt or debris.
6. Any pervious landscaping areas which receive sheet flow from impervious surfaces shall
direct drainage to inlets and catch basins.
7. The drywell will need to be inspected and maintained annually to verify clogging has not
occurred and it is functioning properly. Debris and liter removal shall occur routinely.
The owners of the property will be responsible for the maintenance and upkeep of the
drainage facilities. The property owner shall dispose of sediment and any other waste material
removed from a reservoir at suitable disposal sites and in compliance with local, state, and federal
waste regulations.
D. Proper Function of Best Management Practices
Dry wells must be inspected and maintained yearly to remove sediment and debris that is
washed into them. Minimum inspection and maintenance requirements include the following:
1. Inspect dry wells as annually and after every storm exceeding 0.5 inches.
2. Dispose of sediment,debris/trash,and any other waste material removed from a dry
well at suitable disposal sites and in compliance with local, state, and federal waste
regulations.
3. Routinely evaluate the drain-down time of the dry well to ensure the maximum time
of 24 hours is not being exceeded. If drain-down times are exceeding the maximum,
drain the dry well via pumping and clean out the percolation area (the percolation
barrel may be jetted to remove sediment accumulated in perforations). Consider
drilling additional perforations in the barrel. If slow drainage persists, the system
may need to be replaced.
Drainage swales capture and convey overland flows to area inlets. Stormwater should flow
through the landscape without causing sogginess or erosion. Debris shall be removed from swales
to prevent floatables flushing downstream, clogging and maintain the capacity established in the
drainage study.
E. Record Keeping
The above BMP plan shall prolong the lifespan of the storm water drainage facilities. The
operation and maintenance of the storm water facilities shall be in compliance with the City of
Aspen's Urban Runoff Management Plan (URMP). If the owner cannot perform the routine
facility checks discussed above, then they shall hire someone that can perform the duties in order
to comply with the City of Aspen's URMP. All inspections and any maintenance performed on
the drainage facilities shall be recorded in the inspection and maintenance log included as
Appendix B and made readily available for review by the City of Aspen upon their request.
APPENDIX A
AS-BUILT SURVEY
FINAL GRADING A DRAINAGE AS—It UILT
234 W.FRANCIS STREET,ASPEN,COLORADO
LOTS K,L AND M,BLOCK 48,CITY AND TOWNSITE OF ASPEN,
SECTION 12,TOWNSHIP 10 SOUTH,RANGE 85 WEST OF THE 6TH P.M. N o CO a
CITY OF ASPEN,COUNTY OF PTIKIN,STATE OF COLORADO
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APPENDIX B
INSPECTION SCHEDULE AND LOG
234 WEST FRANCIS ST.
STORMWATER BMP INSPECTION SCHEDULE AND LOG
BMP SWALES STORM SEWER CATCH BASINS/INLETS SLOT/TRENCH DRAIN ROOF DRAINS DRYWELL
FREQUENCY ANNUAL ANNUAL ANNUAL/>0.5"STORM ANNUAL/>0.5"STORM ANNUAL ANNUAL/>0.5"STORM
DATE DATE DATE DATE DATE DATE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30