HomeMy WebLinkAbout- Permits #242-1696 - 50 ROYAL CREST DRIVE 10/28/2020 For Registry of Deeds Use Only
LlMassachusetts Department of Environmental Protection
Bureau of Resource Protection - Wetlands, DEP File Number:
WPA Form 8,B — Certificate of Compliance 242-1696
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided byDEP
A. Project Information
Important:
When filling out 1. This Certificate of Compliance is issued to:
forms on the
computer,use Cornerstone Land Consultants, Inc. c/o Kenneth, Lania
only the tab key Name
to move your P.O. Box 657
cursor-do not
use the return Mailing Address
key. Pepperell MA 01463
City/Town State Zp Code
2. This Certificate of Compliance is issued for work regulated by a final Order of
Conditions or Order of Resource Area Delineation issued to:
AIMCO North Andover, LLC
Name
March 13, 2017 242-1696
Dated DEP File Number
3. The project site is located at:
50 Rgyal Crest Drive North Andover
Street Address City/Town
Map 25 Lots 35 &66
Assessors Map/Plat Number ParcellLot Number
The final Order of Conditions or Order of Resource Area Delineation was recorded at
the Registry of Deeds for:
Property Owner(it different)
Northern Essex 15032 3
County Book Page
Certificate
4. A site inspection was made in the presence of the applicant, or the applicant's agent,
on:
October 21, 2020
Date
B. Certification
Check all that apply:
Complete Certification: It is hereby certified that the work regulated by the
above-referenced Order of Conditions has been satisfactorily completed.
vipaftm8b,cloc rev,5118/2020 WPA Form 813,Certificate of Compliance•Page 1 of 3
LitMassachusetts Department of Environmental Protection
Bureau of Resource Protection - Wetlands DEP File Number:
WPA Form 8B — Certificate of Compliance 242-1696
Massachusetts Wetlands Protection Act M,G,L c. 131, §40 'provided by DEP
B. Certification (cont.)
F-1 Partial Certification: It is hereby certified that only the following portions of work
regulated by the above-referenced Order of Conditions have been satisfactorily
completed. The project areas or work subject to this partial certification that have
been completed and are released from this Order are:
Invalid Order of Conditions: It is hereby certified that the work regulated by the
above-referenced Order of Conditions never commenced. The Order of
Conditions has lapsed and is therefore no longer valid. No future work subject to
regulation under the Wetlands Protection Act may commence without filing a new
Notice of Intent and receiving a new Order of Conditions.
Ongoing Conditions: The following conditions of the Order shall continue:
(include any conditions contained in the Final Order, such as maintenance or
monitoring, that should continue for a longer period).
Condition Numbers:
See Attached List of On-Going_.Conditions
El Order of Resource Area Delineation: It is hereby certified that the wetland
resource area delineation for the above-referenced Order of Conditions has been
satisfactorily completed
C. Authorization
Issued by:
North Andover 10-28-20
Conservation Commission Date of Issuance
This Certificate must be signed by a majority of the Conservation Commission and a
copy sent to the applicant and appropriate DEP Regional Office(See
btt 2s-//www.mass.gov/service-detai IsIm q§LsqLq -rleaional-offices-bv-commun,Ry).
wpafrm8b.doc-rev 6/18/2020 WPA Form 8R,Certificale of Compliance-Page 2 of 3
ILIMassachusetts Department of Environmental Protection
Bureau of Resource Protection - Wetlands DEP File Number:
WPA Foirm 8B — Certificate of Compliance 242-1696
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 -Provided by DEP"_
C. Authorization, (cont.)
Signed by Amy R. Maxner, Conservation Administrator as authorized' by the North
Andover Conservation Commission - See N.E.R.D. Book: 16327 Page: 22
Signature Amy R. Maxner, Conservation
Signature Administrator
Signature Printed Name
Signature Printed Name
Albert Manzi, Jr.
Signature Printed Name
Sean McDonough
Signature Printed Name
Joseph Lynch
Signature Printed Name
John Mabon
Signature Printed Name
Signature Printed Name
wpafrm8b.doc-rev.5118/2020 VVPA Form 813,Certificate of Compliance-Page 3 of 3
Massachusetts Department of Environmental Protection
Bureau of Resource Protection - Wetlands DEP File Number:
WPA Form 8B — Certificate of Compliance 242-1696
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 --—----
Provided by DiEP
D. Recording Confirmation
The applicant is responsible for ensuring that this Certificate of Compliance is recorded in
the Registry of Deeds or the Land Court for the district in which the land is located.
Detach on dotted line and submit to the Conservation Commission.
-------------*-------*-*-*-*------- ---------
North Andover
Conservation Commission
Please be advised that the Certificate of Compliance for the project at:
50 Royal Crest Drive 242-1696
Project Location DEP File Number
Has been: recorded at the Registry of Deeds of:
Northern Essex
County
for:
AIIVIC0 North Andover, LLC
...........
Property Owner
and has been noted in the chain of title of the affected property on.
Date Book Page
If recorded land, the instrument number which identifies this transaction is:
............. .......
If registered land, the document number which identifies this transaction is:
Document Number
Signature of Applicant
vmafrrn8b,doc»rev.511 W020 WPA Form 8B,Certificate of Compliance•Page 4 of 3
1�lfiffilffif
IRW
CONSERVATION DEPARTMENT
(ommunity Development Division
Certificate of Compliance
50 Royal Crest Drive
DEP File #242-1696
Perpetual On-Going Conditions
1. 25' No-Disturbance Zone and a 50' No-Construction Zone shall be
established from the edge of adjacent wetland resource areas except as approved
under DEP # 242-1696. Future work within 100' of existing wetland resource areas
will require a separate filing with the NACC (refer to Section 3.4 of the Regulations
for performance standards within these zones) The Conservation Administrator
and/or other agents of the NACC do not have the authority to waive these setbacks
as established under the local Bylaw;
2. The wetland markers shall be kept in good repair in perpetuity. These markers
designate the wetland resources" sensitivity and assure no further inadvertent
encroachartent into the wetland. The applicant/owner shall instruct all agents to
explain these markers to buyers/lessees/landscapers and all persons taking over the
property from the applicant. These markers shall remain posted and be replaced as
necessary in perpetuity. Markers may be obtained at the Conservation Department
($2 round/$3 square).
3. All storinwater best management practices shall be maintained as specified in the
O&M attached. The approved O&M is fully binding upon the applicant and/or
owners, successors, agents, associations, heirs and assigns and must be adhered to in
perpetuity. Copies of the annual maintenance logs shall be maintained in
perpetuity, with a prior 5 year period of logs available upon request for review by
the NACC or its agent at any time.
4. The applicant or their representative shall annually complete training to educate
vendors and property employees on proper maintenance of the stormwater
pollution prevention system. Proof of training shall be provided to the NACC
annually. This condition is issued under the authority of the Towr's Wetland
Protection Bylaw and shall remain in perpetuity.
5. The applicants, owners, and their successors and assignees, shall maintain, in
perpetuity all swales, grassed channels, deep sump catch basins, outlet structures,
stone infiltration basins, and other elements of the drainage systern,in order to
avoid blockages and siltation which might cause failure of the system and/or
50 Royal Crest Drive
DEP#242-1696
Certificate of Conipliance On-Going Conditions
Page 1 of 2
detrimental impacts to on-site or off-site resource areas, and shall maintain the
integrity of vegetative cover on the site.
6. There shall be no discharge or spillage of fuel, or other pollutants into any wetland
resource area. If there is a spill or discharge of any pollutant during any phase of
construction the NACC shall be notified by the applicant within one (1) business
day. No construction vehicles are to be stored within 100 feet of wetland resource
areas, and no vehicle refueling, equipment lubrication, or maintenance is to be done
within 100 feet of a resource area.
7. No underground storage of fuel oils shall be allowed on any lot within one-hundred
(100) feet of any wetland resource area. This condition shall survive this Order of
Conditions and shall run with the title of the property. This condition is issued
under the authority of the Town's Wetland protection ByLaw.
8. Fertilizers utilized for landscaping and lawn care shall be slow release, low-nitrogen
types (< 5%) and phosphorous free, and shall not be used within 25 feet of a
resource area. Pesticides and herbicides shall not be used within 100 feet of a
wetland resource area. This condition shall survive this Order of Conditions and
shall run with the title of the property. This condition is issued under the authority
of the Town's Welland Protection ByLaw and shall remain in perpetuity.
9. Permanent signs designating"No-Snow Stockpiling Zones" shall be displayed along
paved areas adjacent to wetland resource areas/bio-retention cells. Signs shall
remain in perpetuity.
10. The use of coal tar-based pavement sealants is prohibited on the property, as they
have been determined to contribute high levels of polycyclic aromatic hydrocarbons
(PAHs) to stormwater runoff. This condition shall survive the Order of Conditions
and shall run with the title of the property.
11. There shall be no dumping of leaves, grass clippings,brush, or other debris into a
wetland resource area or beyond the No-Disturbance Zone/Mitigation Areas. This
condition shall survive the issuance of a Certificate of Compliance.
50 Royal Crest Drive
DEP 11242-1696
Certificate of Compliance On-Going Conditions
Page 2 of 2
Existing stcrmwater Management system
era tion & Maintenance
Manual
Royal Crest Estates
50 Royal Crest Drive
North Andover, Massachusetts
i
. I
Prepared fair-
AIMCC North Andover, LLC 1
50 Royal Crest Drive
North Andover, Massachusetts 01845
November 15, 2012
`Last Revised.faituaq 18, 2017)
pCORNERSTONE
Land Consultants� Inc.
—Civil Engineering•land Surveying•Land Planning
61 Main Street o P.O. Box 657 • Pepperell, MA 01463
Phone: 978-433-8100 « Fax: 978-433-8125
Forward
This document is provided to meet the requirement of the Massachusetts Department of
Environmental Protection(DEP),Massachusetts Stoirawater Standards as well as the
requirements of the North Andover Conservation Commission. It is the intent of this manual to
provide a guide for the regular inspection and maintenance of the existing stormwater
management system.
SECTION I BACKGROUND
1.1 Introduction
When a site is developed, some of the landscape is changed from pervious surfaces to less
pervious or impervious surfaces. These new surfaces have different drainage characteristics as
compared to the existing conditions. Since the new areas are not as pervious, less rain and
snowmelt can be absorbed into the ground. This results in less groundwater recharge.Water that
runs over these new surfaces also moves more quickly to downstream areas. This can cause
flooding if the amount of water reaching downstream areas is increased in volume, or if water
accumulates in downstream areas more quickly, or both. Additionally, water that is moving
faster is likely to cause erosion and siltation of downstream areas. The solution to these problems
is to collect and manage stormwater runoff and to attenuate the volume and rate of discharge. By
doing this runoff water can be recharged to the groundwater supply, sediments and other
pollutants can be trapped, and downstream areas can be protected from increased runoff.
Collection of stormwater can be accomplished by a system of swales, catch basins and subsurface
drain pipes. Recharge can be accomplished by infiltration facilities,rain gardens, or dry wells
Suspended solids can be removed by various types of basins and channels, constructed wetlands,
or filters. Attenuation can be accomplished by providing surface or subsurface storage of the
stormwater and releasing the water at a controlled rate. These structural facilities are refe Ted to
as best management practices or BMP's.
For the existing drainage system at Royal Crest Estates, a closed drainage system was installed
which includes numerous catch basins, drain lines, and drainage manholes.The flow of
stormwater conveyed off site by the closed drainage system is through a 36" diameter reinforced
concrete pipe in a southeast to northwest direction to the neighboring subdivisions drainage
system.
1.2 Design Basis
The design basis for the existing drainage system at Royal Crest Estates is not available.
The design basis for proposed drainage systems at Royal Crest Estates is based on peak rate
attenuation of the drainage system was designed on the basis of 2, 10, 25 and 100-yr. frequency
storms in accordance with the USDA Natural Resources Conservation Service Technical Release
20. Storrawater management was further refined using smaller more frequent rainfall events in
accordance with the Mass, DE' Stormwater Management Standards.,
1.3 Inspection & Maintenance Responsibility
inspection&Maintenance of the existing and any proposed drainage system will be the
responsibility of AIMCO North Andover,LLC.
SECTION 2 OPERATION
2.1 Background
Drainage systems are designed to operate with minimal outside intervention.Design calculations
take into account the smaller more frequent storms as well as the less frequent but larger storms.
A wide range of variables are considered with the final specification of pipes, swales,basins and
other structures. It must be realized,however, that the design of a drainage system, which is
based on engineering calculations and field experience, also includes some approximations and
assumptions. This fact, together with local variations in topography, changes within the drainage
area, and other factors,may affect the actual operation of the system. Therefore, field
adjustments may need to be made in some cases to accommodate these variations.
2.2 Operation of BMPs
The following paragraphs describe the best management practices (BMP's)that should be used
in the existing drainage system for Royal Crest Estates.
Bituminous & Cement Pavement
Bituminous and cement concrete pavement consists of performance grade asphalt or cement and
fine grained"aggregates and other additives The base materials are usually layers of graded stone
that provide excellent structural and drainage characteristics Sometimes drain pipes are installed
within the base material in order to drain off excess water. Bituminous and cement concrete
pavement is usually installed in locations that receive constant vehicular traffic. The function of
bituminous and cement concrete pavement includes:
• Provide a permanent walking or driving surface that is impermeable
• Collect stormwater and direct it to collection systems
• Protect underlying soils from erosion or damage caused by high traffic loads
Catch Basins (CB)
Catch Basins are usually made of reinforce concrete and are wide enough inside for a person to
enter and work.A sump is provided to collect sediments and an oil hood is provided to prevent
floatable materials from escaping into the drainage system. A removable grate is provided. The
function of cat6h basins include-,
• Collect stormwater and route it into the drainage system.
• Collect&store oil, debris and sediment.
Culvert & Drain Lines
A drainage culvert is a pipe that routes water across a public way or through an embankment,'
while drain lines are other pipes that route water through a drainage system. Drainage pipes are
made of various materials that provided a predictable flow and structural stability. A minimum
diameter of 12" is usually specified in order to facilitate cleaning equipment. Drain pipes should
not have any vertical or horizontal bends so that they can be inspected from end to end. Drain
pipes have a maximum length to accommodate the limitations of cleaning equipment. The
function of culverts and drain lines includes:
• Transport water safely from one point to another
Drainage Manholes (DMH)
Drainage manholes are usually made of reinforce concrete and are wide enough inside for a
person to enter and work. An access cover and a ladder are provided. The function of manholes
include:
• Inspecting and cleaning of drainage lines
• Provide a means for drain lines to change vertical or horizontal direction.
Flared End Sections (FES)
A flared end section is a termination fixture that is fitted to the end of drainage pipes.The
function of a flared end section includes:
• Provides a smooth transition from a pipe to other surfaces
Grassed Swale
A grassed swale is a shaped ditch that is expected to handle moderate flow and is lined with grass
or other vegetation to provide erosion protection.The function of a grassed swale includes.
• Collect surface water runoff and route,it to other drainage facilities
• Provide erosion protection to the,ground surface within the swale,
• Infiltrate some of the runoff into the soil
Rip Rap
Rip rap is heavy stone or other materials that prevent erosion at the end of drainage pipes or
along channels. The function of rip rap includes:
• Reduce the velocity of flowing water
• Erosion protection
• Filtration of sediments
Roof Drainage
Roof drainage includes a system of gutters and downspouts that helps to prevent roof water
runoff from entering buildings and to reduce erosion around buildings. Gutters collect water at
the eaves and direct the flow to downspouts that convey the flow to either a closed subsurface
foundation drainage system or discharge the flow directly above grade. Some gutter designs have
guards to prevent debris from entering and clogging the system. The primary functions of gutters
and downspouts include:
• Collect water from rainfall or snow and ice melt.
* Divert water away from foundations
Gravel SwaleslEnergy Dissipaters
Energy dissipation controls, constructed of sound materials such as stones, concrete, or
proprietary devices that are rated to withstand the energy of the influent flow, shall be
installed at the inlet to the forebay.Flow velocity into the basin forebay shall be controlled
to 4 feet per second (fps) or less. Energy dissipation controls must also be used at the outlet from
most BMPs unless the basin discharges to a storm drain or hardened channel.
Sedimentation Forebay
A forebay is a basin constructed to trap sediment. The function of a forebay includes:
• Reduce velocity of entering water
• Allow sediment to fall out of slower moving water
• Provide a location to remove sediment from the drainage,system
o Protect downstream facilities that might otherwise be clogged by sediment.
As untreated storrawater enters the treatment train for the Biorctention,Area or other pollutant
removal BMP, it passes through a stone lined forebay for coarse solids removal. The,forebay may
be constructed using an internal berm constructed out of earthen embankment material, grouted
riprap, or other structurally sound material.
o The basin shall be sized so that 25% of the total basin volume is in the forebay and 75%
of the total basin volume is in the main portion of the basin. -
• A gravity drain outlet from the forebay (4" minimum diameter)must extend the entire
width of the internal berm.
o The forebay outlet shall be offset from the inflow flowline to prevent short-circuiting.
a Permanent steel post depth markers shall be placed in the forebay to define settled
sediment removal limits at 50% and 100% of the forebay sediment storage depth.
Bioretention Areas
Bioretention areas are vegetated(i.e., landscaped) shallow depressions that provide storage,
infiltration, and evapotranspiration. Bioretenfion areas also remove pollutants by filtering
stormwater through plants adapted to the local climate and soil moisture conditions and an
engineered soil mix. In bioretention areas,pore spaces,microbes, and organic material in the
engineered soils help to retain water in the form of soil moisture and to promote the adsorption
of pollutants (e.g.,dissolved metals and petroleum hydrocarbons)into the soil matrix. Plants
utilize soil moisture and promote the drying of the soil through transpiration. If no underdrain
is provided, exfiltration of the stored water in the bioretention area engineered soil into the
underlying soils occurs over a period of days. For,areas with low permeability native soils or
steep slopes,bioretention areas can be designed with an underdrain system that routes the
treated runoff to the storm drain system rather than depending on infiltration.In this situation,
treatment is achieved mainly through filtration and adsorption in the vegetation and engineered
soils,in the biofiltration area.
Outlet Control Structures
The outlet structure shall be designed to release the bottom 50% of the detention volume (half-
full to empty)over 24 to 32 hours, and the top half(full to half-full) in 12 to 16 hours. Intent:
Draw down schemes that detain low flows for longer periods than high flows have the following
advantages over outlets that drain the pond evenly:
• Greater flood control capabilities
• Enhanced treatment of low flows which make up the bulk of incoming flows.
There are two options that can be,used for the outlet structure:,
1.Uniformly perforated riser structures.
2.Multiple orifice,structures (orifice plate).
The outlet structure can be placed in the pond with a debris screen or housed in a
standard manhole.Note that a primary overflow (typically a riser pipe,connected to the outlet
works) should be sized to pass the peak flow rate from the developed capital design storm.The
primary overflow is intended to protect against overtopping or breaching of the basin
embankment.
Emergency Spfflway
An Emergency Spillway is usually constructed of graded crushed stone..The spillway is d
usually designed to safely pass the 100-yr rainfall event. The function of an emergency spillway
includes:
• Provide an escape for pended water that rises to the top level of a detention basis due to an
extreme rainfall event,back to back large rainfall events, or clogged outlet facilities.
Pond Water Feature Re-Design — Drainage Overflow Storage Basin
The existing pond water feature has been determined to be of sufficient volume and appropriate
elevations to allow for surcharging,stormwater to be held within it's upper basin during large and
high intensity storm events. The re-design of the pond water feature created a dual use area
within the original extents of the pond, This design consists of an inner and outer retaining wall
system comprising four(4)Bog Filtration areas utilized for the cleaning and treatment of the
pond water. Typical elevation of the pond surface water will be just below the elevation of the
inner wall. This normal operating elevation will allow the Bog Filtration system to circulate the
water within the pond removing pollutants through plant uptake and provide for many years of
clean water operation. During large or high intensity storm events that cause stormwater to
surcharge within the undersized closed drainage system, stormwater flow will be directed into the
pond allowing the storage of some of the surcharging volume. Upon completion of the storm
event and the passing of the peak flow, the pressure within in the inlet to the pond is released and
the pond will drain the additional surcharged stormwater volume into the existing closed
drainage system and return to it's normal operating level. All operating equipment for the pond
will be located within the Outlet Control Structure under the Gazebo for access by Facilities and
Maintenance.
Constructed Stormwater Wetland Basin
Constructed stormwater wetlands are stormwater wetland systems that maximize the removal of
pollutants from stormwater runoff through wetland vegetation uptake,retention and settling.
Constructed stormwater wetlands temporarily store runoff in shallow pools that support
conditions suitable for the growth of wetland plants. Like extended dry detention basins and wet
basins,constructed stormwater wetlands must be used with other BMPs, such as sediment
forebays.
SECTION 3 INSPECTION & MAINTENANCE
3.1 Background
Closed drainage systems in general are designed to be self-cleaning with only a limited amount
of regular maintenance being required. So much emphasis is placed on the ability of the system
to provide drainage control that it is not realized by most people that the design must also
provide for this self-cleaning ability. Catch basin grates are designed to allow as much water as
possible to enter the basin without allowing large debris to enter at the same time. Catch basins
are typically provided with sumps at the bottom of the basins that collect sand and other heavy
debris that gets into the system. Oil hoods are also provided at the basin exit pipes that prevent
most oil, and other materials that float to the top, from entering the closed drainage system.
Some sand and debris will inevitably get into the drainage pipes. These pipes are sized tol
provide a minimum volume and velocity during storms that is capable of lifting and flushing
these materials from the system. Drainage pipes are also sized to prevent too high a velocity
from exiting the pipes that would create soil erosion problems. In some cases heavy rock or
concrete rip rap is provided at the end of these pipes to create turbulence in order to dissipate
some of this erosive energy. Drainage pipes are usually a minimum 12" diameter in order to
accommodate mechanical cleaning systems.Manholes are provided for easy access by this
equipment.
Infiltration basins are designed to manage rising and falling water levels. Sidewalls are sloped
and landscaped to prevent erosion during rainstorms, or sloughing caused by a rapid drop in
water level. Exit pipes and other control structures are provided with the same consideration for
flushing, erosion control and maintenance as a closed drainage system.
Pre-treatment, treatment and infiltration facilities are designed to collect and store sediments and
in some cases recharge stored water into the groundwater supply. As a result of their function
these facilities require more frequent inspection and maintenance.
3.2 Inspection & Maintenance
The following paragraphs describe measures that must be taken on a frequent basis to insure the
drainage system will continue to operate as it was designed. Additional maintenance may also be
required after severe storms, or prolonged rainfall. A log of inspections and repairs should be
kept detailing their frequency and extent,
Bituminous & Cement Pavement
Inspection: Inspect the bituminous &cement concrete pavement for damage in the spring
and fall. Monitor the system and to insure the system is draining properly.
Determine if sediment has accumulated. Determine if any of the pavement has
settled or heaved due to freeze-thaw conditions or flooding..
Maintenance: Sanding and salting of pavers is allowed as required. If any sediment has
accumulated remove it by mechanical means or by vacuurnin . Swee or.
vacuum the pavement quarterly. Vacuuming is the preferred method. Patch
cracks,that develop over time and reseal the surface to maintain a watertight
1 impermeable surface.
Catch Basins
Inspection: Inspect the basins a minimum of four times per year. Clean all catch basins if
sediment accumulation is observed during quarterly observations, and a
minimum of once per year. Inspect frames, covers and concrete for damage.
Maintenance: , Clean out the silt and debris by mechanical means.Dispose of the sediment&
debris according to local regulations, Repair or replace any structural
components that may be damaged
.
Culvert & Drainage Lines
inspection: Inspect the culvert and drain lines once per year. The drain lines must also be
inspected from within the drain manholes. Determine if debris is
accumulating in the lines b,y visual ins action.
Maintenance: If there is an accumulation of debris within the pipe, clean the debris by high
pressure flushing. Install haybales at the end of the drain lines to collect
sediment.Dis ose of the sediment according to local regulations..
Drainage Manhole
Inspection: Inspect the manhole once per year. Determine if debris is accumulating in the
manhole by visual inspection. Inspect frames, covers and concrete for damage.
Maintenance: If ther
e
,is an accumulation of debris within the manhole clean out the debris
mechanical means. Dispose of the sediment according to local regulations.
pchamca means. Dispose of the sediment
e 'according
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Flared End Sections
ins ecfion: Ins act the flared end sections once per year for structural damage
Maintenance., Re air or replace any structural damage
Gravel Swale
hisp act the 3ring and fall and after heavy rainfall
Inspection:
Maintenance: Repair any damage by adding additional stone where there is evidence of
erosion. If excessive or unusual damage is observed add a larger and heavier
sized stone to increase the effectiveness.
Rip.
Ins Inspect the d fall and after heavy rainfall
action:
Maintenance: Repair any damage by repositioning stones that are displaced. Add stones if
required. If excessive or unusual damage is observed add a larger and heavier
sized stone to increase the effectiveness.
Roof Drainage and Downspouts
Inspection: Inspect gutters and downspouts in the spring,fall, and winter, and after,heavy
rain or snowstorms. Check for missing or damaged components. Check for
proper slope of gutters to insure water is being directed to downspouts. Check
gutters for debris and other collected obstructions. Check for ice and snow
buildup in gutters, if downspouts discharge into subsurface perimeter drains
check drain outlets during a runoff event and ensure they are running freely. If
downspouts discharge above grade check for signs of soil erosion and insure
that the water is being directed away from the foundation.
Maintenance: Repair and replace missing or damaged components. Remove all debris from
gutters. Consider adding gutter guards if debris is frequent, such as in the
vicinity of trees. Adjust the slope of gutters if water is pooling within the
gutters. Remove ice and snow buildup within gutters. For closed drainage
downspout systems clean subsurface drain lines that are not flowing freely.
For surface discharge downspout systems consider installation of splash
guards or horizontal extensions to help divert water away from foundations
and reduce soil erosion.
Forebays
Inspection: Inspect the forebays for damage,in the spring and fall and after heavy rainfall.
Determine the depth of sediment that has accumulated.
Maintenance: If more than 4 inches of sediment has accumulated remove it by mechanical
means.Dispose,of the sediment according to local regulations. Repair any
damage to grassed areas by loaming and seeding or adding sod. If loam&
seed are used, cover the patch with straw mulch until the vegetation has been
established. Remove woody vegetation from all berms to prevent structural
weakness. Weed the forebay to prevent an excessive build-up of vegetation.
Emergency Spillways
Inspection. Inspect the emergency s,pillways in the s rin and fall and after heav rainfall
Maintenance: Repair•any damage by repositioning stones that are displaced. Add stones if
required. if excessive or unusual damage is observed add a larger and heavier
sized stone to increase the effectiveness.Weed the swalc to prevent an
excessive build-up of vegetation.
Bioretention Areas
Inspection: Inspect Erosion on the surface of the basin prior to the wet season and after
major storm events. Inspect bioretention cell vegetation monthly to ensure
that no visual contaminants are present and vegetation is healthy. Inspect
standing water areas annually prior to the wet season and replace mulch and
filter media as needed.
Maintenance: Repair small eroded areas and rats by filling with gravel. Overseed bare areas
to reestablish vegetation. Remove trash and debris and rake surface soils to
mitigate ponding. Remove accumulated fine sediments, dead leaves and trash
to restore surface permeability. Remove any evidence of visual contamination
from floatables such as oil and grease. Eradicate weeds and prune back
excess plant growth that interferes with facility operation. Remove invasive
vegetation and replace with non-invasive species. Remove sediment and
debris accumulation near inlet and outlet structures to alleviate clogging.
Clean and reset flow spreaders (if present) as needed to restore original
function. Mow routinely to maintain ideal grass height and to suppress weeds.
Periodkally observe function under wet weather conditions
Pond Water Feature Re-Design - Drainage Overflow Storage Basin
Inspection: The Bog Filtration systems shall be inspected daily during regular operation to
determine if they are functioning as designed. All pond pumps, fountains,
lighting, inlets, drains, outlets and viewing areas including Gazebo with
bridge access shall be inspected quarterly. Inspect Erosion on the surface of
the inner retaining wall prior to the wet season and after major storm events.
Inspect bog vegetation monthly to ensure that no visual contaminants are
present and vegetation is healthy. Inspect standing water areas annually prior
to the wet season and re lace mulch and filter media as needed.
Maintenance: Remove trash and debris and rake pea stone within the bog areas to ensure
vegetation health. Remove accumulated fine sediments, dead leaves and trash
to restore surface permeability. Remove any evidence of visual contamination
from floatables such as oil and grease. Eradicate weeds and prune back
excess plant growth that interferes with facility operation. Remove invasive
vegetation. Remove sediment and debris accumulation near inlet and outlet
structures to alleviate clogging. Winterize pond system at the end of the fall
season. Remove all pond electrical pumps and fountains and store
appropriately on site over winter. Vacuum Outlet Control Structure to remove
sediment with debris sump area below pumps. Periodically observe function
under wet weather conditions
Inspection & Maintenance Schedule
Inspection &Maintenance Frequency
BMP's Spring Fall Winter Heavy l Monthly'.
Rainfal
Bituminous &Cement Pavement x x
Catch Basins x x x x x
Culverts and Drainage Lines x
Drainage Manhole x
Flared End Sections x x x
Gravel Swale x x x x
Rip Rap x x x
Forebay x x x x
Bioretention Area x x x x
Outlet Control Structures x x x
Emergency Spillways x x
Roof Drainage& Downspouts x x x x x
Pond Water Feature x x x x x
Constructed Stormwater
Wetland Basin x x x x
'-During the growing season
Inspection & Maintenance Budget
Cost($) Yearly
M
Spring Summer Fall Winter Occasional Total
Task
Inspection &
Documentation 5,800 5,800 3,500 15,100
Maintenance&Repair
Cleaning& Flushing 8,500 8,500 17,000
Loam, Seed, Mulch 3,850 3,850 7,700
Mowing &Weeding 14,000 9,500 14,000 37,500
Structural 19,500 19,500
Pond Winterization 6,500 6,500
Average Cost
103,300
Yearly average includes inspections after heavy rainstorms and Infrequent structural repairs
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Appendix A: Inspection Lag
Project: Royal Crest Estates.; 50 Royal Crest Dr..;North Andover,MA.
Inspection by: Date:
BMP Inspection Maintenance
Report Required
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Appendix B Maintenance Log
Project: Royal Crest:Estates.; 50 Royal Crest Br..;North Andover,MA.
Maintenance by:
BM P Date Maintenance
Performed
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