HomeMy WebLinkAbout1993-04-12 Wetland Restoration & Construction Control Plan DEF SUB {
ETLANos
y 4 RESERVATION
NC,
Wetland Restoration and Construction Control Plan
Stevens Crossing
Oegood Street
North Andover, Massachusetts 01845
March 2, 1993
Prepared for
Rogers Park Realty Trust
733 Turnpike Street Suite 209
North Andover, Massachusetts 01845
By
Wetlands Preservation, Inc.
569 North Street
Georgetown, Massachusetts 01833
569 North Street 47 Newton Road 126 Wildcat Road
Goorgetowo, MA 01833 Plaistow, NH 03865 Barrington, NH 03825
[508)352-7903 (603)382-3435 (603) 664-7645
Wetland Restoration and construction Control. Flan
Stevens Crossing`
Osgood Street
North Andover, MA
1.0 Introduction
The following report provides specifications for erosion and sediment control
.-..,-measures:,, ,the control of construction act ivit ie a-and—restorat ion of off site
wetlands which will be temporarily impacted due to the construction of a sewer
line crossing of the Cochichewick Brook for the Stevens crossing subdivision
located on Osgood Street in North Andover, Massachusetts.
Specifications for both on site and off site erosion and sediment control
measures associated with this limited project crossing and site development
which will be undertaken to maintain water quality and prevent sedimentation of
wetlands during and after construction are provided. These specifications are
based on the proposed sewer line as shown on Sheets 4, 5 and 8 of the 40 scale
Special Permit and Definitive Plan prepared for Rogers Park Realty Trust by
Merrimack Engineering Services, Inc. dated January 30, 1993.
2.0 Wetland Impact Area Descriptions
Sewer Stations 600+70 to 601+70
The wetland resource area directly associated with the brook, between Sewer
Station 600+70 and Sewer Station 601+70, has a substrate which is a combination
of mineral and organic soils, all of which are considered hydric.
y ! f
The installation of the sewer line is confined to the side slopes of the
existing road fill between Sewer stations 600+70 to 601+70 and on to Road
station 11+00, except for 40t feet of impact to the actual stream bed, which has
a substrate of deep very fine textured alluvial sediments.
The depth of fill over hydric soils varies with the location of the sewer line
along the road side slope and generally increases closer to the road. The
removal of this fill overburden will expose very poorly drained mineral soils
beneath. The organic surface layer of the flatural soils has been compressed by
the deposition of road fill.
similar very poorly drained mineral soils predominate at the toe-of-elope of the
road fill, in the area along wetland flags A4 - A8, These soils will behave
very similar to organic soils during excavation of the sewer line trench by
virtue of their very fine sandy texture, organic matter content and saturated
consistency.
These very poorly drained mineral soils typically possess 8 to 15 inches of
sapric organic muck over one to several feet of fine' and very fine sandy
alluvial sediments which possess a high percentage of organic matter.
Very poorly drained organic soils- tend to lie further from the existing road in
the backwaters of the brook and typically have 161 inches of highly decomposed
muck over one to several feet of fine and very fine sandy alluvial sediments
which possess a high percentage of organic matter. The underlying material is
very coarse textured sandy and gravelly material with a large percentage of
small cobbles.
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The organic and mineral soils have both been directly disturbed by the
construction of Osgood Street and indirectly by construction of the bridge and
the ensuing changes in the flow characteristics and channel of the brook. The
changes in flow have altered the manner in which alluvial sediments are
deposited and organic matter is accumulated. Although the construction of the
road and bridge have altered its flow attributes, the brook continues to
influence the morphology of all hydric soil types in this area.
Vegetation found in the area between Sewer Station 600+70 and Sewer Station
601+70 includes ash (Fraxinus app. ) , black cherry (Prunus serotina) , elm (Ulmus
sp. ) and spruce (Picea sp. ) in the tree stratum. The shrub stratum consists of
red panicled (Cornus foemina) and red osier (Cornus stolonifera) dogwoods,
Northern arrowwood (Viburnum recognitum) , tartarian honeysuckle (Lonicera
tatarica) and red maple (Acer rubrum) . Additionally, the road fill side slope
has multiflora rose (Rosa multiflora) and some staghorn sumac (Rhos typhina) .
The herbaceous stratum has purple loosestrife (Lythrum salicaria) , sensitive
fern (Onoclea sensibilis) and skunk cabbage (Symplocarpus foetidus) . The road
fill side slope has red panicled dogwood, goldenrod (Solidago sp. ) and sedge
(Carex sp. ) species in the herbaceous stratum. Wild grape (Vitis op. ) can be
found in the liana stratum. Observations of soils and vegetation were made near
wetland flag A7.
No portions of this site fall in a rare or endangered species habitat zone as
listed by the 1992 Edition of the Atlas of Estimated Habitats of State-listed
Rare Wetland Wildlife, South Groveland Quadrangle. (See Figure 1. )
3
Road Stations 11+30 to 13+00
The entire length of the sewer crossing from Road Station 11+30 to Sewer Station
604+70 (at Road Station 13+00t) will be installed within the buffer zone. More
specifically the installation will take place within the side slopes of the road
fill from Osgood Street which cover the natural hydric soils of the former
wetland resource area to a depth of 1 to 2 feet (average) .
The wetland resource area in close proximity to the installation of the sewer
line in the buffer zone between Road Stations 11+30 and 13+00 has a substrata of
poorly drained mineral soils. These soils are considered hydric.
The soils of the wetland and the buffer zone have been disturbed by the
construction of Osgood Road and the access road to North Andover High School.
The hydrology of this area has also been altered as there is no culvert under
the access road to the high school.
The vegetation in the nearby wetland resource area includes species which also
frequent the road fill where the construction will take place. The tree and
shrub strata are absent in this area. The shrub stratum includes Northern
arrowwood, elm, elderberry (Sambucus canadensis) , witherod (Viburnum
cassinoides) , tartarian honeysuckle and multiflora rose. The herbaceous stratum
is composed of purple loosestrife, goldenrod, aster (Aster op. ) , curled dock
(Rumex crispus) , evening primrose (Oenothera biennis) and meadowsweet (Spiraea
latifolia) . The liana stratum is composed of wild grape. Observations of
soils, vegetation and hydrology were made in the area near wetland flag B2.
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Road Station 30+60
Between Road Stations 9+50 and 31+20 the sewer line will either be .installed
within the road side slopes or underneath the road. The vegetation and soils to
either side of the crossing of a stone culvert beneath the road at Station 30+60
have not been examined because no permanent direct impacts are being proposed.
However, the crossing involves the potential for sedimentation of down stream
wetlands so erosion and sedimentation control measures planned for this area are
discussed in the next section and in the construction sequence as well.
3.0 Erosions and Sedimentation Controls
Erosion Controls
In addition to customary erosion and siltation control measures such as hay bale
and silt screen barriers, various other management practices will be employed to
maintain water quality and minimize damage to wetlands by sedimentation. These
measures include a permanent sedimentation/detention pond for construction and
post-construction stormwater control, dewatering filter devices, check dams,
clay trench dams and a pump discharge diffuser. Additionally, work on the sewer
line will not commence before July so as to avoid high stream flow conditions in
the spring.
Hay bale and silt screen barriers will be securely installed as per the site
plans prior to the commencement of any site work. Silt fencing will be backed
by a row of hay bales. Hay bales will be double staked and silt fence will be
dug in as per site plan detail drawing. The erosion control barrier will be
inspected after installation to insure that all sources of erosion will be
controlled and will be adjusted as necessary.
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Sedimentation Detention Pond
The sedimentation/detention pond is designed to provide control of both
sedimentation and stormwater runoff flow rates during construction activities
and is intended to offer detention after construction efforts are complete. The
pond will be constructed prior to commencing site development activities or
simultaneous to the installation of drainage utilities.
The pond will have a 100 year ponding elevation of 127.0 and an overflow
elevation of 127.5. The pond outlet invert at 123.7 will be fitted with an
elbow and a two foot vertical overflow pipe added. The vertical overflow will
be constructed of perforated plastic or metal pipe wrapped with hardware cloth
and filter fabric to increase detention and siltation removal during
construction. The extension pipe and elbow will be backfilled with crushed
stone for stabilization and additional sediment trapping. This apparatus will
be removed after construction is complete and any areas of bare soils within the
detention pond will be stabilized. The outlet pipe from the sedimentation pond
will have a short rip-rap apron where it exits the pond to disperse the flow.
The accumulation of the sediment in the pond will be monitored during site
construction and removed if the depth exceeds 12 inches. Any side slopes altered
as a result of sediment removal will be loamed and reseeded.
Dewaterina Filters
Dewatering filter devices will be used to treat water pumped from the trenches
during installation of the sewer pipe (see Figure 2) . Two such filters will be
constructed near the proposed sewer manhole at Sewer Station 600+70 (see Sheet 8)
and one will be constructed to the east of the stone wall in the open space
6
opposite Road Station 30+25 (see Sheet 4) . Sufficient materials will be kept
onsite for maintenance purposes and construction -of back up filters as necessary.
The dimensions of the dewatering filters will be approximately 10 feet by 20 feet.
They will involve dug in silt fence backed by double staked hay bales on the
outside and will have 6 inches of crushed stone or mulched hay in the bottom. In
the event that secondary dewatering filters are needed at either location, they
will be constructed no closer than 5 feet to the existing filter.
Stream Flow and channel Protection
The sewer is proposed to cross through Cochichewick Brook to the south and to pass
beneath a stone culvert to the north. To control stream flow conditions and to
protect the existing channels at each location, temporary check dams will be
fabricated using plywood, timbers and sand bags and employed to suspend flow at
the bridge and at the stone culvert during construction activities.
,Additional flash boards will be added to the outlet structure from Stevens Pond to
temporarily suspend flow during construction of the sewer while working in the
brook. Pumps will be used to draw down any excessive stream flow and bypass the
construction area. Care will be taken to avoid downstream pump discharge
scouring, and if necessary, a pump discharge diffuser will be utilized to disperse
flow from the pump that will be used to draw down the brook. The flash boards,
check dam and pump will be removed when work in the brook is finished, at which
time the stream bed will be restored and erosion control barrier will be
rearranged to isolate the remainder of the excavation north of the wing wall from
the brook.
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Clay trench dams will be utilized to eliminate the propensity of the sewer trench
to act as a conduit for drainage to or from wetlands. Clay will be placed in the
sewer trench before backfilling between the manhole at Sewer Station at 600+70 and
the wetland boundary, and opposite Road Stations 11+00, 11+30t, 13+00±, 30+50t and
30+70t.
4.0 Restoration Specifications
After construction is complete, the dewatering filters will be removed and the
area will be restored and seeded with turf grass mix similar to that of the
remaining lawn at the North Andover DPW. Remaining dewatering filter areas will
be removed and seeded with conservation mix. Upland slope areas will be seeded
with an aggressive slope stabilizing mix such as NH Slope 44 at the recommended
application rate of 60 pounds per acre (refer to attached seed specifications) .
All areas will be restored immediately after completion of the sewer installation.
Remaining areas of wetland disturbance associated with the sewer trench or erosion
control will be loamed and seeded with a 1:1 mixture of switchgrass and redtop.
switchgrass
(Pa.azcum virgatum) 1:1 mix seeded on exposed soil
surfaces at an application rate
redtop of 50 lbs./acre.
(Agrostis alha)
5.0 Construction Monitoring
As part of the site construction work, the owner will retain a wetland scientist
to oversee construction activities. The oversight provided will include
monitoring of construction activities, erosion control devices, planting of
plant stock and reports to the North Andover Conservation Commission (NACC)
documenting the restoration of the area.
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Statue reports will be provided following construction and planting of the area
and as requested thereafter until compliance is achieved and a Certificate of
Compliance is attained. The reports will document any corrective actions
required to attain appropriate compliance. Photographs will also be furnished
to document the progress and to provide a basis for determining compliance.
6.0 Construc.tion Sequence
Wetland CrossingStation 600+70 to 601+70
Notify wetland scientist and NACC of construction schedule prior to
commencement of construction.
- Install siltation fence and hay bale barrier as per site plan. Hay bales to be
double staked. Siltation fence edge to be buried 6 inches.
- Construct dewatering filter devices on adjacent DPW land. Siltation fence to
be buried 6 inches. Hay bales to be double staked. Additional materials for
maintenance purposes and for construction of an additional filter to be
available onsite.
- Mobilize heavy machinery, flash boards, lumber, trench box, pumps, hose, 3/4
inch plywood, timbers and sand bags to site.
- Construct check dam upstream of bridge using plywood, timbers and sand bags.
Leave a partial opening to be closed when construction commences.
- Prepare pump discharge diffuser using plywood and timbers.
- Cut flash boards to length for damming outlet of Stevens Pond.
- Place trench box and begin excavation for sewer manhole at Station 600+00.
Begin dewatering trench into filter devices.
- Install sewer pipe and sewer manhole at station 600+70.
- Install flash boards to dam Stevens Pond outlet.
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t
-- Close off opening in check dam at bridge.
- Install pump upstream of bridge. Run hose to pump discharge diffuser.
W Excavate sewer pipe trench to manhole at Station 601+70 stockpiling any
topsoils in waiting trucks.
Install steel ductile pipe between 5MH 600+70 and 601+70.
Install clay trench dams on each side of wetland crossing between Sewer Station
600+70 and the wetland boundary and opposite Road Station 9+50.
- Restore stream bed and extend erosion control to isolate stream bed excavation
area from remainder of installation at eastern wing wall.
Remove erosion control in stream channel.
-- Enclose disturbed wetland area in erosion control.
Slowly remove check dam.
- Slowly remove flash boards from pond outlet.
- Continue installing remainder of sewer line to Road Station 11+00±.
Install clay trench dam opposite Road Station ll+00±.
Backfill surface of trench with stockpiled topsoil and restore original grade.
Repair guard rail and side walks.
Seed entire disturbed area with grass seed mix.
Monitor soil stability and remove silt fence and break up hay bales upon
approval of NACC.
Road Stations 11+30 to 13+00
- Notify wetland scientist and NACC of construction schedule prior to
commencement of construction.
- Install siltation fence and hay bale barrier as per site plans.
-- Place trench box and begin excavation for ductile iron sewer pipe and sewer
manhole at Station 604+70.
10
Add additional hose as necessary and dewater to filters on DPW lawn.
Install clay trench dam in sewer lane opposite Road Stations 11+30± and
13+00±.
Backfill trench and loam and seed with conservation mix upon completion of
installation.
Culvert Crossing at Road station 30+60
- Notify wetland scientist and NACC of construction schedule prior to
commencement of construction.
- Construct dewatering filter device in the field opposite Road Station 30+25.
Additional materials for additional filter to be available nearby.
- Install check dam of plywood, timbers and sand bags on upstream opening of
stone culvert.
- Install erosion control barrier across down stream opening of stone culvert.
- Begin excavation of stone culvert for sewer line.
- Begin dewatering into filter devices.
- Install sewer line and repair stone culvert as necessary after construction
is complete.
- Install clay trench dams at Road Stations 30+50 and 30+70.
-- Remove check dam when construction is complete and seed any disturbed
wetlands.
- Remove down stream erosion control barrier and seed disturbed wetlands.
Adams, Roger and Bailey Squares
- Notify wetland scientist and NACC of construction schedule prior to
commencement of construction.
11
i r
Establish erosion and sediment control barriers as per site plan. silt
fence to be dug in and backed by hay bales. Hay bales to be double staked.
Conduct inspection of erosion control barriers with NACC. Adjust or extend
barrier as needed.
- Construct erosion and sediment control pond. Install perforated extension
pipe and wrap with hardware cloth and filter fabric. Backfill with crushed
stone. Place rip-rap apron at outlet.
Install subsurface utilities and begin project build out.
- Monitor pond sediment and remove when accumulated depth exceeds one foot.
Seed all exposed upland soils with grass seed upon completion.
Monitor soil stability and remove silt fence and break up hay bales upon
approval of NACC.
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1 l
New Hampshire Slope 44
Species % Composition
creeping red fescue 42%
perennial rye 33%
alsike clover 8%
bi.rdsfoot trefoil 8%
redtop 8%
Application rate: 60 lbs, per acre
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FIGURE 1 •
ETLANOS
•,RESERVATION
INC. STEVENS CROSSING
Osgood Street
. r
North Andover, MA
i
-071A
PLAN
(NO SCALE)
S14y` �540—:.
SECTION "A • A "
ENO SCALE )
FIGURE 2
Dewatering Filter
569 North Street 47 Newton Road 126 Wildcat Road
Georgetown, MA 01833 Plaistow, NH 03865 Barrington, NH 03825
(508)352-7903 [603] 382-3435 (603)664-7645