HomeMy WebLinkAboutAgreement & As Built_232 Coach Rd_0015.2021 (2).BRES1111111 Hill 11111111111111111111111111111111111111111111 Hill Hill 111111111111111111111
RECEPTION#: 704184, R: $68.00, D: $0.00
DOC CODE: AGREEMENT
Pg 1 of 12, 08/19/2024 at 11:14:33 AM
Ingrid K. Grueter, Pitkin County, CO
STORMWATER BEST MANAGEMENT PRACTICES
OPERATIONS AND MAINTENANCE AGREEMENT
City of Aspen, Colorado
THIS AGREEMENT, made and entered into this j day of : J4-%QL , 20A, by and between (Insert
Full Name of Owner) Ljc. a -�c C , L L-C, hereinafter called the
"Landowner", and the City of Aspen, Colorado, hereinafter called the "City".
WITNESSETH
WHEREAS, the Landowner is the owner of certain real property described as (Pitkin County tax Map/Parcel
Identification Number) P,; 3 5 O a 5 O 3 0n9 located at
2 52.1 a _ A -%tap n . L' O , SsltAnd as more fully as follows, to wit:
also known as, , hereinafter called the "Property"; and
WHEREAS, the Landowner is proceeding to build on and develop the property; and
WHEREAS, the stormwater management BMP Operations and Maintenance Plan for the property identified herein
has been approved by the City, herein after called the "Plan", which is attached hereto as Appendix A and made part
hereof, as approved by the City, provides for management of stormwater within the confines of the Property through
the use of stormwater management or Best Management Practices (BMPs) facilities; and
WHEREAS, the City and the Landowner, its successors and assigns, agree that the health, safety, and welfare of
the residents of City of Aspen, Colorado and the maintenance of water quality require that on -site stormwater
management/BMP facilities be constructed and maintained on the Property; and
WHER V AS, the City requires, through implementation of the Plan from the Landowners dated
() l IS and attached hereto, that on -site stormwater management/BMPs as shown on the Plan be
adequately constructed, operated, and maintained by the Landowner, its successors and assigns.
NOW, THEREFORE, in consideration of the foregoing premises, the mutual covenants contained herein,
and the following terms and conditions, the parties hereto agree as follows:
I. Construction of BMP facility by Landowner. The on -site stormwater management/BMP facilities shall be
constructed by the Landowner, its successors and assigns, in accordance with the plans and specifications
approved by the City and identified in the Plan.
2. Duty of Operation and Maintenance of Facility. The Landowner, its successors and assigns, including any
homeowners association, shall adequately operate, inspect, and maintain the stormwater management/BMP
facilities as acceptable to the City and in accordance with the specific operation, inspection, and maintenance
requirements noted in the Plan. Adequate operation and maintenance is herein defined as good working condition
so that these facilities are performing their design functions.
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3. Duty of Documentation. The Landowner, its successors and assigns, shall document inspections, maintenance,
and repairs performed and provide said documentation to the City or its representatives upon request.
4. Right of Entry on Property. The Landowner, its successors and assigns, hereby grant permission to the City,
its authorized agents and employees, to enter upon the Property at reasonable times and upon presentation of
proper identification, and to inspect the stormwater management/BMP facilities whenever the City deems
necessary. The purpose of inspection is to follow-up on suspected or reported deficiencies, to respond to citizen
complaints, and/or to assure safe and proper functioning of the facilities. The City shall provide the Landowner,
its successors and assigns, copies of the inspection findings and a directive with timeline to commence with the
repairs if necessary.
5. Failure to Maintain. In the event the Landowner, its successors and assigns, fails to construct, operate and
maintain the stormwater management/BMP facilities in good working condition acceptable to the City, the
City, its authorized agents and employees, may enter upon the Property and take whatever action(s) deemed
necessary to correct deficiencies identified in the inspection report and to charge the costs of such construction
or repairs to the Landowner. It is expressly understood and agreed that the City is under no obligation to install,
construct, or routinely maintain or repair said stormwater management/BMP facilities, and in no event shall this
Agreement be construed to impose any such obligation on the City.
6. Reimbursement by Landowner. In the event the City pursuant to this Agreement, performs work of any nature,
or expends any funds in performance of said work for labor, use of equipment, supplies, materials, and the like,
the Landowner, its successors or assigns, shall reimburse the City upon demand, within thirty (30) days of
receipt thereof for all actual costs incurred by the City hereunder.
7. Duty to Inspect by City. The City, its employees or representatives, shall inspect the stormwater
management/BMP facilities at a minimum of once every three years to ensure their continued and adequate
functioning.
8. Release of City. The Landowner, its executors, administrators, assigns, and other successors in interests, shall
release the City, its employees and designated representatives from all damages, accidents, casualties,
occurrences, or claims which might arise or be asserted against said City, employees, and representatives from
the construction, presence, existence, operative or maintenance of the stormwater management/BMP facilities
by the Landowner or City. In the event that a claim is asserted against the City, its elected officials, City
Officers or employees, the City shall promptly notify the Landowner and the Landowner shall defend, at its own
expense, any suit based on the claim. If any judgment or claims against the City's employees or designated
representatives shall be allowed, the Landowner shall pay all costs and expenses regarding said judgment or
claim.
9. Recording of Agreement running with the Property. This Agreement shall be recorded in the real property
records of Pitkin County, Colorado, and shall constitute a covenant running with the Property or land, and shall
be binding on the Landowner, its administrators, executors, assigns, heirs and any other successors in interests,
in perpetuity.
RECEPTION#: 704184, 08/19/2024 at 11:14:33 AM, Pgs 3 of 12, Ingrid K. Grueter, Pitkin County, CO
IN WITNESS WHEREOF the undersigned have hereunto affixed their signatures as of the date first above written.
LANDOWNER:
By: —!' Print Name:
jay
The foregoin Agreement was acknowledged before me this day of , 2A-14
byA '
My Commission Expires://.7 joir-1 I%/
THE CITY OF ASPEN:
By:
State of Colorado ) :ss
County of Pitkin )
OFFICIAL SEAL
N[Notary
b%JLVIA H. FLORES
Public - State of Illinoismmission Expires 09/13/2026
Print Name: PJ K/af q
The foregoing Agreement was acknowledged before me this I day of Auyu s+ , 20L4,
by P3 MVrw
o ary Public
My Commission Expires: 0-1 11 2 b
LORENA VARGAS
NOTARY PUBLIC
STATE OF COLORADO
Notary ID 20174029180
My Com*3im E.,*m July 12, 2026
RECEPTION#: 704184, 08/19/2024 at 11:14:33 AM, Pgs 4 of 12, Ingrid K. Grueter, Pitkin County, CO
P.O. Box 3901 YARNELL CONSULTING & 229 Midland Ave.
Eagle, Colorado 81631 Basalt, Colorado 81621
CIVIL DESIGN, LLC
(970) 323-7008.7/17/2024
Subject: 232 Coach Road
Stormwater Best Management Practices Maintenance Plan
In general, the drainage design for this property employs vegetated swales, inlets, and below -grade
piping to convey runoff generated on the site to one of five (5) locations on the site:
1. A majority of the driveway is tributary to a depression west of the fire truck turnaround.
This area functions as a bioretention basin where water is introduced by flowing overland,
sits in the depression, and slowly infiltrates through the sandy topsoil into the well -draining
soils beneath the site.
2. The fire truck turnaround itself, plus the concrete auto court, are tributary to bioretention
structures northwest of the visitors' auto court. Once introduced into the structures via
overland conveyance, the water sits and slowly infiltrates through the sandy topsoil into the
well -draining soils beneath the site.
3. The homeowners' auto court, front courtyard, and the northwesterly approximately one-
half of the building roof is tributary to a below -grade stormwater detention and infiltration
(StormTech) system located beneath the homeowners' auto court. Water is introduced into
this system via surface drains interconnected by below -grade piping. The roofs all
incorporate drainage systems that convey water directly to the pipes and do not permit
water to discharge onto the ground. Once into the system, water sits and slowly infiltrates
through the filter fabric into the well -draining soils beneath the site.
4. South of the home, water flows overland to a bioretention structure located adjacent to the
fire pit terrace. Once introduced into the structure, the water sits and slowly infiltrates
through the sandy topsoil and into the well -draining soils beneath the site.
5. East of the home, a below -grade stormwater detention and infiltration (StormTech) system
is located beneath the yard area. Water is introduced to this system via surface and roof
drains. The roofs all incorporate drainage systems that convey water directly to the pipes
and do not permit water to discharge onto the ground. Once into the system, water sits and
slowly infiltrates through the filter fabric into the well -draining soils beneath the site.
Maintenance associated with the storm water infrastructure of the project generally requires that
built-up sediment be removed from the vegetated swales, inlets, and piping to ensure they maintain
capacity and conveyance capability. If any portion of the swales remain wet and squishy, it may
indicate the need to re -grade the swale.
The bioretention areas shall be inspected to ensure water continues to flow freely into them.
Periodic removal of sediments and pollutants may be necessary when clogging reduces infiltration
capacity to a point where the area does not completely dry out after 72 hours without precipitation.
For more information, refer to Table 2 below which is Table 8.12 within the city of Aspen's Urban
Runoff Management Plan.
232 Coach Road Pagel of 3
RECEPTION#: 704184, 08/19/2024 at 11:14:33 AM, Pgs 5 of 12, Ingrid K. Grueter, Pitkin County, CO
P.O. Box 3901 YARNELL CONSULTING &
Eagle, Colorado 81631
CIVIL DESIGN, LLC
(9701 323-7008.7/17/2024
Table 1: Maintenance Recommendations or Rioretention
229 Midland Ave.
Basalt, Colorado 81621
Re wired Action
Maintenance Objectives
Frequency
Inspections
Inspect detention area to
Routine - Annual inspection of
determine if the sandy growth
hydraulic performance.
media is allowing acceptable
infiltration.
Lawn mowing and vegetative
Occasional mowing of grasses
Routine - Depending on
care
and weed removal to limit
aesthetic requirements.
unwanted vegetation.
Maintain irrigated turf grasses
as 2 to 4 inches tall and non -
irrigated turf grasses at 4 to 6
inches.
Debris and litter removal
Remove debris and litter from
Routine - Depending on
detention area to minimize
aesthetic requirements.
clogging of the sand media.
Landscaping removal and
The sandy loam turf and
Every 5 to 15 years, depending
replacement
landscaping layer will clog
on the infiltration rates
with time as materials
needed to drain the WQCV in
accumulate on it. This layer
12 hours or less. May need to
will need to be removed and
do it more frequently if
replaced to rehabilitate
exfiltration rates are too low
infiltration rates, along with
to achieve this goal.
all turf and other vegetation
growing on the surface.
Sediment will clog the StormTech systems; therefore, must be kept out. In my opinion, the greatest
source of sediment on this property is likely to be traction sand introduced onto the driveway by
your vehicles during the winter. When it comes time to clean traction sand from the site, it should
be swept up and placed in a trash receptacle instead of down into a trench drain. For any debris
that does make its way into a trench drain, consider utilizing a shop -vac to extract these items
versus flushing them down with water.
In the bottom of each surface drainage structure is a sump beneath the outgoing pipe. These sumps
will work to capture sediment before it can reach the StormTech system. These sumps should be
inspected annually, and any debris should be extracted via shop -vac.
Sediment that makes its way through all the pipes and drainage structures will collect in the
StormTech systems. The chambers should be inspected and maintained in accordance with the
manufacturer's published documentation which is included as an attachment to this letter. These
systems can be accessed via the drain basins that have been placed on the side. There should be no
water in the system 72 hours after the end of a precipitation event. If water is observed a the
chamber, it means the system is not infiltrating sufficiently. A vacuum truck should be employed to
remove the sediment from the floor of the chambers.
232 Coach Road Page 2 of 3
RECEPTION#: 704184, 08/19/2024 at 11:14:33 AM, Pgs 6 of 12, Ingrid K. Grueter, Pitkin County, CO
P.O. Box 3901 YARNELL CONSULTING & 229 Midland Ave.
Eagle, Colorado 81631 Basalt, Colorado 81621
CIVIL DESIGN, LLC
(9701 323-7008.7/17/2024
There is one (1) French drain on the property. It lies parallel to and northwest of the pool patio
beneath the swale flowline. This drain has a layer of topsoil over a pocket of gravel containing a
perforated underdrain. Filter fabric has been provided to prohibit topsoil from migrating down into
and plugging the gravel. However, over time, it is possible the system will lose efficiency. In the
event there is ever squishiness in the lawn or standing water, we should be contacted. It is likely
that the drain is not working correctly.
All maintenance shall be done by the owner or his property manager. The city's engineering
department will also inspect the stormwater infrastructure on a regular basis to ensure it is being
maintained.
We are happy to answer any questions or provide additional support to ensure your drainage
system continues to function optimally.
232 Coach Road Page 3 of 3
RECEPTION#: 704184, 08/19/2024 at 11:14:33 AM, Pgs 7 of 12, Ingrid K. Grueter, Pitkin County, CO
Immw ,- 1
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ALI-
RECEPTION#: 704184, 08/19/2024 at 11:14:33 AM, Pgs 8 of 12, Ingrid K. Grueter, Pitkin County, CO
THE ISOLATOR " ROW
INTRODUCTION
An important component of any Stormwater Pollution Prevention
Plan is inspection and maintenance. The StormTech Isolator Row is
a technique to inexpensively enhance Total Suspended Solids (TSS)
removal and provide easy access for inspection and maintenance.
THE ISOLATOR ROW
The Isolator Row is a row of StormTech chambers, either SC-160LP,
SC-310, SC-310-3, SC-740, DC-780, MC-3500 or MC-4500 models,
that is surrounded with filter fabric and connected to a closely located
manhole for easy access. The fabric -wrapped chambers provide for
settling and filtration of sediment as storm water rises in the Isolator
Row and ultimately passes through the filter fabric. The open bottom
chambers and perforated sidewalls (SC-310, SC- 310-3 and SC-740
models) allow storm water to flow both vertically and horizontally out of
the chambers. Sediments are captured in the Isolator Row protecting
the storage areas of the adjacent stone and chambers from sediment
accumulation.
Two different fabrics are used for the Isolator Row. A woven geotextile
fabric is placed between the stone and the Isolator Row chambers.
The tough geotextile provides a media for storm water filtration and
provides a durable surface for maintenance operations. It is also
designed to prevent scour of the underlying stone and remain intact
during high pressure jetting. A non -woven fabric is placed over the
chambers to provide a filter media for flows passing through the
perforations in the sidewall of the chamber. The non -woven fabric is not
required over the SC-160LP, DC-780, MC-3500 or MC-4500 models as
these chambers do not have perforated side walls.
The Isolator Row is typically designed to capture the "first flush" and
offers the versatility to be sized on a volume basis or flow rate basis.
An upstream manhole not only provides access to the Isolator Row but
typically includes a high flow weir such that storm water flowrates or
volumes that exceed the capacity of the Isolator Row overtop the over
flow weir and discharge through a manifold to the other chambers.
The Isolator Row may also be part of a treatment train. By treating
storm water prior to entry into the chamber system, the service life can
be extended and pollutants such as hydrocarbons can be captured.
Pre-treatment best management practices can be as simple as
deep sump catch basins, oil -water separators or can be innovative
storm water treatment devices. The design of the treatment train and
selection of pretreatment devices by the design engineer is often
driven by regulatory requirements. Whether pretreatment is used or not,
the Isolator Row is recommended by StormTech as an effective means
to minimize maintenance requirements and maintenance costs.
Note: See the StormTech Design Manual for detailed information on
designing inlets for a StormTech system, including the Isolator Row.
Looking down the Isolator Row from the
manhole opening, woven geotextile is shown
between the chamber and stone base.
r,- 1-,;,-
StormTech Isolator Row with
Overflow Spillway (not to scale)
MANHOLE
WrFH
OVERFLOW
WEIR
CCENTRIC
HEADER
STORMTECH CHAMBERS
RECEPTION#: 704184, 08/19/2024 at 11:14:33 AM, Pgs 9 of 12, Ingrid K. Grueter, Pitkin County, CO
ISOLATOR ROW
INSPECTION/MAINTENANCE
INSPECTION
The frequency of inspection and maintenance varies by location. A
routine inspection schedule needs to be established for each individual
location based upon site specific variables. The type of land use (i.e.
industrial, commercial, residential), anticipated pollutant load, percent
imperviousness, climate, etc. all play a critical role in determining the
actual frequency of inspection and maintenance practices.
At a minimum, StormTech recommends annual inspections. Initially,
the Isolator Row should be inspected every 6 months for the first year
of operation. For subsequent years, the inspection should be adjusted
based upon previous observation of sediment deposition.
The Isolator Row incorporates a combination of standard manhole(s) and strategically located inspection ports
(as needed). The inspection ports allow for easy access to the system from the surface, eliminating the need to
perform a confined space entry for inspection purposes.
If upon visual inspection it is found that sediment has accumulated, a stadia rod should be inserted to
determine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length
of the Isolator Row, clean -out should be performed.
MAINTENANCE
The Isolator Row was designed to reduce the cost of periodic maintenance. By "isolating" sediments to just
one row, costs are dramatically reduced by eliminating the need to clean out each row of the entire storage
bed. If inspection indicates the potential need for maintenance, access is provided via a manhole(s) located on
the end(s) of the row for cleanout. If entry into the manhole is required, please follow local and OSHA rules for a
confined space entries.
Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water
nozzle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is
retrieved, the captured pollutants are flushed back into the manhole for vacuuming. Most sewer and pipe
maintenance companies have vacuum/JetVac combination vehicles. Selection of an appropriate JetVac nozzle
will improve maintenance efficiency. Fixed nozzles designed for culverts or large diameter pipe cleaning are
preferable. Rear facing jets with an effective spread of at least 45" are best. Most JetVac reels have 400 feet
of hose allowing maintenance of an Isolator Row up to 50 chambers long. The JetVac process shall only
be performed on StormTech Isolator Rows that have AASHTO class 1 woven geotextile (as specified by
StormTech) over their angular base stone.
StormTech Isolator Row (not to scale)
Note: Non -woven fabric is only required over the inlet pipe connection into the end cap for SC-160LP, DC-780, MC-3500 and MC-4500 chamber
models and is not required over the entire Isolator Row.
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RECEPTION#: 704184, 08/19/2024 at 11:14:33 AM, Pgs 10 of 12, Ingrid K. Grueter, Pitkin County, CO
ISOLATOR ROW STEP BY STEP MAINTENANCE PROCEDURES
STEP 1
Inspect Isolator Row for sediment.
A) Inspection ports (if present)
i. Remove lid from floor box frarne
ii. Remove cap from inspection riser
iii. Using a flashlight and stadia rod,measure depth of sediment and record results on maintenance log.
iv. If sediment is at or above 3 inch depth, proceed to Step 2. If not, proceed to Step 3.
B) All Isolator Rows
i. Remove cover from manhole at upstream end of Isolator Row
ii. Using a flashlight, inspect down Isolator Row through outlet pipe
1. Mirrors on poles or cameras may be used to avoid a confined space entry
2. Follow OSHA regulations for confined space entry if entering manhole
iii. If sediment is at or above the lower row of sidewall holes (approximately 3 inches), proceed to Step 2.
If not, proceed to Step 3.
STEP 2
Clean out Isolator Row using the JetVac process.
A) A fixed floor cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable
B) Apply multiple passes of JetVac until backflush water is clean
C) Vacuum manhole sump as required
STEP 3
Replace all caps, lids and covers, record observations and actions.
STEP 4
Inspect & clean catch basins and manholes upstream of the StormTech system.
SAMPLE MAINTENANCE LOG
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S7stem jetted and vacuuWed
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