HomeMy WebLinkAboutStormwater Report - 250 CLARK STREET 4/9/2013 i
Operation&Maintenance Plan
"250 Clark Street"
250 Clark Street,North Andover,MA 01845
February 7,2013
Revised: March 26,2013
I Revised:April 9,2013
This Operation&Maintenance Plan has been prepared to comply with the provisions set forth in the
Massachusetts Department of Environmental Protection(DEP)Stormwater Management Standards.
Structural Best Management Practices(BMPs)require periodic maintenance to insure proper
function and efficiency in pollutant removal from stormwater discharges that would otherwise
reach wetland resource areas untreated. Maintenance schedules found below are as recommended
in Department of Environmental Protection's Massachusetts Stormwater Handbook and as
recommended in the manufacturer's specifications.
j The following BMPs shall be utilized for project at 250 Clark Street for pollutant removal from
stormwater discharge as well as providing additional groundwater recharge on site:
• Parking Lot Sweeping
• Biofilters with stone diaphragms --
• Stone Trench for roof runoff
The responsible party for following the Operation&Maintenance Plan long-term after construction
has been completed will be Flight Landata,Inc. Should Flight Landata,Inc.not be the tenant of the
facility in the future,the responsibility will revert back to the Leasehold Owner;Michael Florence.
See attached Inspection Log.
Parking Lot Sweeping_
• We recommend that the parking lot be swept at a minimum of once per year in the spring.
Biofilters:
• Inspect and remove trash year monthly throughout the year.
• Remove and replace dead vegetation annually in the spring.
• Prune the shrubs annually in the spring.
• Remove any sediment from the top of the stone diaphragms and from the pretreatment
sideslope annually in the spring.
® Mow the pretreatment sideslopes once a month during the growing season.
a When areas of erosion are identified,repair areas of erosion and revegetate as needed as
soon as possible.
• Inspections shall be performed at least twice a year,or after a major storm event which is
defined as a storm that is equal to or greater than the 2-year storm event.
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Operation&Maintenance Plan
250 Clark Street, North Andover, MA 01845
Revised:April 9,2013
• During these inspections,record and map the following information:
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-The presence of accumulated trash and/or debris,
-The presence of dead vegetation and/ or invasive species (invasives must be removed),
-Stability of the sideslopes and berms,
-Accumulation of sediment,
-Survival rate of plantings (dead plantings must be replaced)
Stone Trench for roof recharge:
• Leaf screens shall be installed in'the gutters to prevent debris from reaching the trench.
® Install three(3)inspection ports to be located at the beginning,middle and end of trench.
• Should standing water be present in bottom of system during a routine inspection or more
than twenty-four(24)hours after the end of a rainfall event,it may be as a result of the stone
bed layer being clogged. The amount of elapsed time required for the water to infiltrate
completely should be recorded. If after seventy-two (72)hours from the end of a rainfall
event there is still standing water in the bottom of the trench,the affected area should be
excavated and the stone replaced with clean stone.
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I We recommend the following schedule for system maintenance
Monthly in first year of service:
-Check inlets for clogging and remove any debris as necessary
-Check for depressions in areas over and surrounding the system
Spring and fall in the second year service:
-Check inlets for clogging and remove any debris as necessary
-Check for depressions in areas over and surrounding the system
One year after commissioning and every year following:
-Check inlets for clogging and remove any debris as necessary
-Inspect the interior of the trench via inspection ports and measure sediment or
depth of standing water
-Check for depressions in areas over and surrounding the system
-Confirm that no unauthorized modifications have been performed to the site
• It should be noted that most failures that occur in subsurface-systems are due to inadequate
pre-treatment which leads to clogging. However,this system shall only receive roof runoff
from the roof,which is considered clean by DEP and does not require pre-treatment.
Therefore,we do not expect there to be any adverse impacts to the system due to debris
accumulation.
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INSPECTION AND MAINTENANCE REPORT FORM
250 CLARK STREET, NORTH ANDOVER, MA
TO BE COMPLETED TWICE PER YEAR(SPRING & FALL)OR WITHIN 24 HOURS
OF A 2 YEAR STORM EVENT(3.1 INCH OR GREATER WITHIN A 24 HOUR PERIOD)
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Name of Inspector: Date:
Inspector's Company/Affiliation:
Days Since Last Rainfall: Amount of Last Rainfall:
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Maintenance Required:
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To Be Performed By: On of Before:
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