HomeMy WebLinkAboutMiscellaneous - 450 CHESTNUT STREET 4/30/2018 i
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Geotechnical Engineering Environmental Studies Materials Testing Construction Monitoring
RECEIVED
June 9,2004
Law Offices of Ralph R. Joyce JUN 15 2004 po
Attn: Mr. Ralph R. Joyce NORTH ANDOVER
121 Collins Landing CONSERVATION COMMISSION
Weare,New Hampshire 03281
RECEIVED
re: SLOPE STABILIZATION RECOMMENDATIONS JUN 1 5 2004
REAR OF LOTS I THROUGH 4
CHESTNUT STREET BUILDING DEPT.
NORTH ANDOVER,MASSACHUSETTS
GSI PROJECT NO. 202175
Dear Mr.Joyce:
Geotechnical Services, Inc. (GSI) has visited the referenced site on May 18, 2004 and observed the
conditions of the earthen slope which has been subject to erosion and local sloughing failure. Based on our
review we offer the following recommendations with respect to permanent soil stabilization.To assist in our
review of the slope conditions we were provide with the results of a topographic survey performed by
GeoAmbient Engineering,Inc. (GAE) as well as a Drainage Analysis and Sediment&Erosion Control Plan
dated 9/29/03 also by GAE.
SLOPE TOPOGRAPHY AND EXISTING CONDITIONS
There were two areas of localized slope failure observed at the time of our visit. Between stations 1 and 2
referencing the GAE topographic plan,there are downgradient and upgradient,shat low seated slope failures,
of approximately 20 by 50 feet. These failures are characteristic of a sloughing of the surficial soil fill
resulting from an instability at the fill/parent soil interface. The resulting scarp is.12 to 18 inches deep and
exposes a profile of the fill soil unit which appears to be a fine to medium silty sand with some to little gravel
(reworked glacial ti 11). Groundwater was observed to be seeping from the scarp/parent soil interface. Parent
soils are Paxton series glacial till deposits. Frequent rill erosion was observed throughout the slope.
The occasional topsoil veneer possesses negligible tilth and fertility and the extent of topsoil thickness is
insufficient to support the vegetation which is composed of sparse perennial rye grasses. Upland of the
affected portions of the slope,the area is generously vegetated with a mix of deciduous and coniferous trees
and underbrush. There are no signs of slope instability in the naturally vegetated areas.
Based on the topography provided by GA Consultants, Inc. the earthen slope ascends at the rate of 2H:1 V
from the existing"Redi-Rock"retaining wall to a narrow,2 feet deep drainage swale running square to the
slope. From this point the slope further ascends on a 2:H:1V slope to the crest of the hillside at roughly
elevation 190 feet.CThe swale shows severe gully erosion and the crushed stone lining has been transported
downgradient towards the swale terminus
12 Rogers Road, Haverhill, MA 01835 978/374/7744 FAX 978/374/7799
18 Cote Avenue, Goffstown, NH 01041 603/624/2722 FAX 603/624/3733
Chestnut Street Earth Slope Recommendations GSI Project No.202175
June 9,2004 Page 2
SOIL SLOPESTABILIZATION
The parent soils are dense glacial till deposits which are inherently stable, in terms of global or deep-seated
stability, in natural slopes as steep as I H:1 V. Such soils possess a great deal of silt and clay which render
them prone to erosion. In the case oft_the shallow slope failure is the result of external erosion
of the reworked glacial till fill as well as internal instability induced due to the effects of groundwater
se„ epage Our recommendations with respect to slope stabilityimprovement are t vofold.,subsurface drainage
to relieve seepage forces and"bio-structural"erosion control incorporating hardy vegetation]
Subsurface Drainage
� To obviate the groundwater seepage and thus enhance s4ope it is recommended that the interceptor
drainage swale be undercut with an underdrain. The underdrain may be 4-inch ADS, Hancor type slotted
drain pipe set within a 2 x 3 feet trench and enveloped with 3/4 inch crushed stone. The entire perimeter of
the trench should be wrapped with filter fabric,Mirafi 140N or equal product. The underdrain will serve to
intercept groundwater and induce a depression in the phreatic surface;the result will be enhancement of the
overall slope stability. The underdrain detail is depicted on the attached sketch_
The drain maybe placed along the alignment the existi�swale and it's invert may daylight into the swale
at a distance downgradient in advance of the proposed retention pond._Onc
- a the drain is installed the
interceptor Swale should be reworked to the geometry shown of the attached detail The swale should be
lined with Mirafi 500X stabilization fabric and then lined with rip-rap meeting the requirements of
Massachusetts Highway Department,M2.02.4, Modified Rockfill.
Bio-structural erosion Control
Surface erasion may be countered by the establishment of deep-rooted,hardy vegetation along the slopeside.
The beneficial effects of vegetation on the slope would include mechanical stabilization of the surficial soils
by the root and stem structure and modification of the subsurface hydrology by the processes of evapo-
transpiration. Secondary effects include a marked retardation and velocity reduction in stormwater run-off.
GSI recommends that the slope be covered with a minimum of 6-inches of humus of such nature and organic
content capable of sustaining vegetation. GSI further recommends that an erosion control mat such as North
American Green 5150 or equivalent be mechanically affixed to the slope immediately after humus
placement. One supplier ofthe above-referenced mat is lennian Enterprises of Melrose,Massachusetts.-The
mat provides erosion protection and slope stability prior to establishment of vegetation.
Subsequent vegetative cover may be established by using a hardy mixture of grass and legume seeds
including annual Rye grass and Crown Vetch. Crown Vetch is a legume that possesses a fairly deep root
system and grows to a height of about two feet. The legumes are desirable for nitrogen contribution via
transportation processes and subsequent inoculation into the tilth layer. A distinct advantage of the Crown
Vetch is that it does not require mowing so there is virtually no maintenance involved with the slope
protection. The Crown Vetch should be applied at a rate of 20 lbs/acre; an.innoculant is required and is
typically provided by the supplier.
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Chestnut Street Earth Slope Recommendations GSI Project No.202175
June 9,2004 Page 3
Crown Vetch will not establish on acid soils therefore it is necessary to check the topsoil for pH and
incorporate lime as required. It maybe necessary to broadcast from'2 to 4 tons of ground limestone per acre
to reduce acidity. Because the Crown Vetch exhibits slow seedling vigor,we recommend that a nurse crop
be planted to germinate quickly and provide some degree of protection. The nurse crop may be 10 lbs/acre
of annual Ryegrass and 50 lbs/acre of Red Fescue.
The humus may require the application of fertilizer to enhance growth and promote root structure. Our
preliminary recommendations is an application of 10 parts nitrogen-10 parts phosphorus-10 parts potassium
at a rate of 100 pounds per acre.For best establishment,lime and fertilizer should be worked into the top four
to six inches of soil. Seed germination will be facilitated with mulch cover provided by the erosion control
mat.
Construction Monitoring
It is recommended that GSI be retained to observe construction procedures for conformance with contract
requirements,documents and design concepts.
We trust that the contents of this report is responsive to your needs at this time. Should you have any
questions or need further assistance, please do not hesitate to contact our office.
Very truly yours,
GEOTECHNICAL S VICES,INC.
HarryK. etherbee, P.E.
Principal Engineer
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Chestnut Street Earth Slope Recommendations GSI Project No.202175
June 9,2004 Page 4
LIMITATIONS
Explorations
1. The analyses,recommendations and designs submitted in this report are based in part upon the data
obtained from preliminary subsurface explorations. The nature and extent of variations between
these explorations may not become evident until construction. If variations then appear evident, it
will be necessary to re-evaluate the recommendations of this report.
2. The generalized soil profile described in the text is intended to convey trends in subsurface
conditions. The boundaries between strata are approximate and idealized and have been developed
by interpretation of widely spaced explorations and samples; actual soil transitions are probably
more gradual. For specific information, refer to the individual test pit and/or boring logs.
3. Water level readings have been made in the test borings under conditions stated on the logs. These
data have been reviewed and interpretations have been made in the text of this report. However, it
must be noted that fluctuations in the level of the groundwater may occur due to variations in
rainfall,temperature,and other factors differing from the time the measurements were made.
Review
4. It is recommended that this firm be given the opportunity to review final design drawings and
specifications to evaluate the appropriate implementation of the recommendations provided herein.
5. In the event that any changes in the nature,design,or location of the proposed areas arc planned,the
conclusions and recommendations contained in this report shall not be considered valid unless the
changes are reviewed and conclusions of the report modified or verified in writing by Geotechnical
Services, Inc.
Use of Report
.b. This report has been prepared for Mr. Ralph Joyce in accordance with generally accepted soil and
foundation engineering practices. No other warranty,expressed or implied, is made.
7. This report has been prepared for this project by Geotechnical Services, Inc. This report was
completed for preliminary design purposes and may be limited in its scope to complete an accurate
bid. Contractors wishing a copy of the report may secure it with the understanding that its scope is
limited to evaluation considerations only.
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6" TOPSOIL
6" RIPRAP
2
MIRAFI 50OX
1 STABILIZATION FABRIC
4, 1
1.5 3/4" CRUSHED STONE
4" DIAMETER HANCOR
18„
ADS SLOTTED DRAIN PIPE
"PAXTON SERIES" GLACIAL
t•:Y:
TILL PARENT SOIL
NOTES:
L" A
1/2 # / 1000 SQ. FT.
CROWN VETCH
HARD FESCUE AS NURSE GRASS — 1# / 1000 SQ. FT.
EARTH SLOPE CROSS SECTION GS GEOTECHNICAL SERVICES INC.
18 COTE AVENUE, UNIT #11, GOFFSTOWN, NH 03045
I TEL (603) 6242722 FAX. (603) 624-3733
SLOPE STABILIZATION RECOMMENDATIONS Drawn By: J.L. Date: 6/9/04 Figure
CHESTNUT STREET Checked By: H.W. Scale: 1/4"=1'—D" 1VN o. 1
NORTH ANDOVER, MASSACHUSETTS File Name: Project No.:
Massachusetts Department of Environmental Protection
ILIBureau of Resource Protection -Wetlands DEP File Number:
WPA Form 8B — Certificate of Compliance 242-1075
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by DEP
A. Project Information
Important:
When filling out 1. This Certificate of Compliance is issued to:
forms on the
computer,use Ralph R. Joyce, Esq.
only the tab key Name
to move your 121 Collins Landing
cursor-do not Mailing Address
use the return
key. Weare NH 03281
City/Town State Zip Code
2. This Certificate of Compliance is issued for work regulated by a final Order of
Conditions issued to:
Ralph R. Joyce
Name
May 17, 2001 242-1075
Dated DEP File Number
3. The project site is located at:
450 Chestnut Street(Lot 2) North Andover
Street Address CityTrown
Map 98C Parcel 114
Assessors Map/Plat Number Parcel/Lot Number
the final Order of Condition was recorded at the Registry of Deeds for:
Old Yankee Realty Trust, Ralph R. Joyce,Trustee
Property Owner(if different)
Essex North 6259 329
County Book Page
Certificate
4. A site inspection was made in the presence of the applicant, or the applicant's agent,
on:
Ill�a� ►o
Date
wpafrm8b.doc-rev.12/23/09 WPA Foran 88,Certificate of Compliance•Page 1 of 3
ILIMassachusetts Department of Environmental Protection
Bureau of Resource Protection -Wetlands DEP File Number:
WPA Form 8B — Certificate of Compliance 242-1075
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by DEP
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.
❑ 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.
�j 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).
i
Condition Numbers:
62
C. Authorization
Issued by:
North Andover f�1'7110
Conservation Commission Date of Is uance
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
hftp://www.mass.gov/dep/about/region/findvour.htm).
Signatures:
wpafrm8b.doc-rev.12/23/09 WPA Form 8B,Certificate of Compliance-Page 2 of 3
I
Massachusetts Department of Environmental Protection
I
ILIBureau of Resource Protection -Wetlands DEP File Number:
WPA Form 8B — Certificate of Compliance 242-1075
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by DEP
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.
To:---------------------------------------------------------------------------------------------------
North Andover
Conservation Commission
Please be advised that the Certificate of Compliance for the project at:
450 Chestnut Street(Lot 2) 242-1075
Project Location DEP File Number
Has been recorded at the Registry of Deeds of.-
Essex
f:Essex North
County
for:
Ralph R. Joyce, Esq.
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
wpafrm8b.doc•rev.12/23/09 WPA Farm 813,Certificate of Compliance•Page 3 of 3
