HomeMy WebLinkAbout1987-07-15 Engineer Review SPR • Y
HAVES ENGINEERING, INC.
603 SALEM STREET
WAKEFIELD, MA 01880
(617)246-2800 REFERTORLE# NOA--0030
August t3 , I987
North Andover Planning Board
Town Hall
North Andover. , MA 01845
Attn: Erich W. N'itzsc e, Chairman 4 be��1►tiE����F l`.���������
Dear Mr . Nitzsche:
Enclosed are two copies of the Crusader i3aper site plan revised to
incorporate Condition 7 of your Site Plan approval® Yoga will note
that I added a proposed spot elevation at the entrance to indicate
that the sur.tace runoff will riot .Leave the site. I also lowered the
culvert one foot to maintain over two feet of cover , as you
requc-s ted®
I trust that this revision will satisfy your Conditions , as far as
Site Plan modifications are concerned.
Very truly yours ,
Edward 2 . Stearns, R.L. S.
Hayes Engineering , Inc.
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Enclosures
CC . Bill Conroy
Maynard Assoc2.ates
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HAYES ENGINEERING, INC.
603 SALEM STREET
WAKEFIELD, MA 01880 NOA-0030
(617) 246.2800 REFER TO FILE -------
FAX (617) 246-7596
September 7, 1989
Attorney John Willis
Willis & Willis Attorneys
160 Pleasant Street - Rear
North Andover , MA 01845
RE:: Comparative Quantities
Crusader Paper
Dear Mr. Willis :
In response to the request of Jim Maynard that I provide you , in
writing, our estimate of the difference in quantity between the-
grading shown along the southerly wall of the Phase I building as
originally proposed on the Site Plan of Crusader Paper , dated April
3, 1987 , revised to October 3, 1988, and the Site Plan of Crusader.
Paper , dated April 3 , 1987, with final revision date of August 3,
1989, we have computed that quantity and find it to be 15, 400 cubic
yards. In addition, there is approximately 1, 400 square yards of
additional pavement south of the southerly wall.
I trust this information is suitable for your purpose.
Very truly yours,
Peter J. Ogren, P.L, . , P.f .S.
President
PJO/dab
r
Geotechnical consultants
of Massachusetts, Ina. (508) 685.4800
21 August 1989
crusader paper Company ry
25 xndustri.al wax
Wilmington, MA 01887
Attentriont Mr, Jack Costello
RE : Cut Slope Treatment
Crusader Paper Facility
North Andover, MA
Dear Mr. Costello:
In accordance with your request and our previous
disoussi.ons, herein are our preliminary recommendations
relative to the slope .exi.sti.ng at the above referenced
site . Based on visual. observations of the site conditions
and examination of topographical information compiled by
Hayes Engineering, the following alternatives are
applicable for slope treatment at the site.
As discussed in our earliest report of the site, we
recommend that the natural undisturbed glacial till slopes
not exceed a 111 gradient. We consider any slopes steeper .
than this to be unstable a,nd subject to failure. This
includes the existing slopes and rock walls which have been
previously constructed without: inspection at the site. The
areas around the toe of these slopes should be cordoned off
to keep people and equipment a safe distance away. These
areas are shown in the sections produced by Hayes
Engineering on the south side of the property (between
section A and D) . We also consider the stone rip-rap slope
constructed on the west side of the property at the
southwest: building ;ornex to be .unstable and this area
should be condoned off as well until remedial work can
occur.
To correct the existing unstable slope situations two
obvious methods present themselves. The first is to
regrade the virgin 'till from the existing toe of slope
inwards while keeping at least a one to one slope. This
will entail taking away land within the 151 setback strip
for a distance of at least +/-100 ;feet along the top of the
slope. At some point: between section C and D, construction
of a 1 :1 slope will be possible without encroaching on the
setback strip.
Willows Protesslonal Park 799 Turnplke Street North Andover, Mass. 01845
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We recommend that this alternative be pursued as the most
ideal solution since this construction could proceed the
quickest and would be the least expensive ii1 terms of an
overall remediation . si,milavly, it would also be advisabkQ
to determine tf the existing toe of ,slope can be moved to
the south anywhere alone its length to decrease the amounit .
of setback encroaChmant that would be necessary.
The other alternative is to regrade the slope with the
setback line as the control , bringing the 1 : 1 slope down to
the toe . some type of Retaining wall along the toe would
be utilized in, this case where the slope would intersect a
point higher in elevation than, the existing toe elevations.
Retaining wall, construction m.ay include a cast'-in-place
concrete structure, or soldier- beam and lagging cantilever
retaining wall . Based on our estimates at this time, a
soldier beam and lagging wall, is slightly more expensive
although it could probably be constructed quicker.
Because of the density of the till , any new retaining wall
must be keyed into the virgin soil enough to resist the
anticipated lateral forces , with the remaInder of the
structure then deriving its retaining ability from this
foundation. This requIrement eliminates other retaining
methods such as crib walls and gabi.ons where friction
interaction between the members is the only mode of major.
lateral force resistance .
The problems inherent with construction of a retaining wall
scheme is the existing working conditions which would
include the presence of slopes much steeper than 1i1 above
the work area, This will require specialized construction.
methods which may increase unit, costs significantly. As is
evident in our sketches, the effort to place compacted
structural backfi.11, behind a cast-in-place wall, would be
signifiaant as temporary slope support or protection would
be necessary. on the other hand, drilling in soldier beams
would decrease the severity of this situation but the
actual, drilling. operation may be very difficult due to
. encountering boulders in the till .
For any type of retaining wall system chosen, a Swale
should be created along the backside of the wall to collect
uninterrupted runoff and direct it to the site drainage
system. similarly, a toe drain must also be included in
the construction to relieve any hydrostatic pressures along
the 'base of the slope. This 'may be accomplished by either
using a collector pipe along the backside of the wall or by
placing perforations/weep boles. in the wall to allow water
to pass through and be collected on the front side,
with regards to construction of the new 1 : 1 slope, we
recommend that all loose natural soil or disturbed till be
removed to expose dense virgin till . This surface should
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then be covered with a filter fabric followed by bedding '
stone in turn covered by tightly fitted rip-rap, as shown
,in our accompanying sketch. This system will. permit
Drainage swales running parallel to the contours should be
constructed at the top and bottom o,f the slopes and within
the slope wherever possible , where zones of noticeably
heavy groundwater breakout are observed, vertical, finger.
trench drains should be installed to confine the waxer and
direct it to downgradi,ent swales . All swales or trench
drains should include filter fabric placed directly against
the virgin soil before filling with washed crushed stone .
The drains should then be covered over with filter fabric
again to prevent any sediment infiltration. This use is
recommended in particular for the slope where loam has been
placed at the southeast cQra,ex- of the site .
Similarly, to stabilize the l.oamed slopes until vegetation
can be established, biodegradable erosion control blankets
can be placed over the slopes . This type of material is
manufactured by numerous companies and we can give you
further details on the cost of such an application if you
wish. we recommend that this method be considered only, for
areas where it is apparent that hydxoseedi,ng alone will not
be effective .
Xn light of the fact that significant site work and slope
regrading has occurred at the site to date, we think it is
vary important to include inspection of any remedial work
by qualified personnel as part of the scope for any
Proposed construction. This measure will help to- ensure
that the new slope related Work is performed in accordance
with proper construction techniques and that any apparent
unacceptable Construction now existing is repaired,
We trust the above and attached information is adequate for
Your immediate needs . If you have anY questions related to
the above, please feel free to contact us .
Si.ncer ly,
Michael C. Penn
cc : Jim Maynard, Maynard construction
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