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. WATERWAY. WITH STONE CENTER ORAfN'
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DIKE EMBANKMENT CONSTRUCTION V e
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of: r v ��
Foundation Preparation
Ths, existing soils on sits are suitable for the direct support of the
proposed dike embankment. It is recommended that the organic topsoil be I X 41 �S
stzip ro
yad and ots tubbed b' a ov 1 th
g • Proposed a embankment alignment within Aft a
clea defined by the toe Of the upstream and dankmentan slopes. After \
clearing, stripping and grubbing along the embankment alignment, it Ia ,(\u \j/ ♦
recommended that the exposed sandy subsoil be proofrolled and densified. by , Ra 1`. !, o/ ♦ S
making at least S passes over the entire area with a self propelled vibratory � �: - _ �. CLE/9+� '5'11/Q `. '. I'll
a �� ^X
drug compactor (8,000 lb minimum weight At the drum):. The purpose of this is !
�I
to rain.. arum that may have become dos ed, t during the. claming and �
*subbing. After this has been mpactelYshed, than the. first layer of _ pai,�a t �♦
esb,n mene fill can be placed and compacted. — FlL 7,f A5 �i AC) )!G ,!p0• .� -[�/!
�animen Fill i _ A
i The room material for eons cru<clon. of the emoankmuc is a alley sand -
having a designation of SN according . to the Unified Soil Classification
System. This magna that At lust 12 percent of the material by weight
dati is O� 40'
�\ _
ffnet than the No. 209 stave. *from con. the runts, of the gradations t/ YS
anticipad en o mean, sail sample from Cho b tsar pits, on site material is ice- - / _ ' '
significant to mearnout requirement unless material classification change
• significantly throughout the site. The matsrial should also be substantially "- - y„ Pip "F. _ _Li -,• -✓ 111 \ \\ / 3'
ttu of roots and organic mawrial and Co s - - - \
8 p oil should not be included. 0-
longitudinal Eabankmamt fill should be placed in unifara lifts e
. (12 inch or la) to t o / , iF'
( ff
longitudinal direction Of the dike. Lath lift should be placed at a mofanite
within 2 percent of the opt
Lewis moisture and be compacted m at least 95
par got maximum. theoretical density
�•-- ' � ^' \
ry (dscarmined by ASH D1157). As the -
r
esbanlame fill pro<asdr. upvas4, the slopes should be constructed steeper or
embankment wider so: Wee We loon uneou aeuQ soils en We a10 a 'J ` " -, " - ,�' ' V. ["41 " - /
P slop *& the �.'})3 ✓1. , •..ir 1.:./j,.i.it .mot .�''Fi��l(s -:(-� "'!� .�
- - -- -- -- `
embankment een be cut end. regraded to the. design slope. Thif procedure will ai ov o P • _ r (�fJ'' . ._ . a/t ; ��
1 compaction to occur at the face of the ,lopes. —.-� , + } i ''
� ( to i go to
i
The recommeeMed design slopes are as follows: to r
Upstream 2.5 horizontal I vertical --____ _..._. .... _ ... - �.. _... _.. - -.—. , go
Downstream Downstream _ II
Downstream , E horizontal 1 vertical � f� ^' L - � 400 V �•
Ties .age t r et theoretical calculations se respect to stabilization of and „ {j t
X
seepage through the embankment for these slopes accuses that uublished l7 LOH/-I �$ Q' OYEJZ T .(i��'
- factors of safety exist. These slopes are also in U.S. accordance t of published k SCj$ /OIJ .$TA 77AT /OA/ �� /AL AttZ ,�
information planation in Design. of Small .Dame, , Department en Interior. ,� • }+„s/ \ \ \t5 >'\��
In Flu re Reelaaaeion; 1974, Aosncepcual. sketch of the embankment is. shove E- e4 - " % TI , of �: i t
• 1a Figure 2. - loo rear Flood
stag - ■
� stage � ■ � _ f 1
During <
g es p Lally heavy, prolonged uinfabe such a We d. yser atom event. - Existing Ground 2'� Site Fill f ! ¢ ✓ '
se is possible that the from,kment may become saturated. This along with 1F_ On Site Fill 7Y 11 Downstream seepage tortes da4•Iopsd from dike storage, mey result in sloughing at the jH /
downstream slope. In our opinion however, this is a minor risk. CLEFh/ AJD
Alternatives to alleviate this from developing include flattening the �- i
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r
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ram Win
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r ♦ r
/3 HE /6 TOF t ,ice
dovnstzam. slope to 3 horizontal to 1 vertical or the installation of a drain <<i/�A.V E'A/T ,' e
_ , ./ �C the dovnstraas toe, Clear and. .'—" .
Groh , _ •' r t
Erosion Protection i � +� -Yo F N� Aim,
Section nt ( + SEE DETAIL_ 4pI' iQ' /f•'iL �. '' ®� s -
-It is iscommendad Chat. the smbanlmant;c -be stabilized to protect it from �paYjpE ivtkR.aMAT C:ROShON scoriae a -A• A�Vi: \ t ( y �'�
erosion. Stabilized methods should not entail the use of trees since the. `\
root system in the embankment will be detrimental in ices +long term.' t:O1,11F4 •• WATSKIAL SY tAI KAa Fl) ROJr5lOt4 it , 0 - 1
9RAPPROVaII EQUAL, DUKIWGt
Pine Outlets G.ONSTRUGTIOK ON 2'l2; I Ante{
",It is our understanding, that two 1e outlets are - 7 "1 SLO g" a y� ~
3 �� T.� -
.� � * pipe proposed as described t , - _.-- � Q (J�il
previously. Lhasa pipet should be fitted with seepage collars to 2" R.C.P. 12• die pipe
preclude
_ • -.the potential of seepage from occurring be mean the pipe and - earthen
ambadment leading to soil erosion. It is our opinion that tdo collars " .1+tk44
should be plated At the 1/3 points along the low Tavel outlet and one eo71aY -- 8
S
j be placed at Ws mid point of Wi hSgit Tavel outlet. • J Section e e• �yjH QR ri7,9S ��
\) 28" wide y\F' `y9PA l r
It is recommended that the collar consist of either a block of concrete or a nutlet Pipe C,11. RICHARD
section of bentonite clay. he collar should extend about 6 to 12
beyond the circumference of the pip*. The La or concrete plug should be PAUL m f Crlel//
Y P p clay P g Detail 01 Seepage Collar o
above -12 to I8 inches vide. If corrugated metal yips is used, soul collars o.. WEB rib
¢. 1 s
\ ,t t - say be available which can be bolted to the pipe.
Designed by The Geotechnical Group Inc.
It is recommended that the pipes . and collar be placed as the earthen
embankment In constructed, ' The embankment material should be placed and _ CAna2aGE Daxva LEXINGTON, NAssacltuscrrs I A I I NAL ,ti� 1
tightly compacted adjacent to, below and above, the pipe and collar.
- The Geotechnj.ca Group .l G I. .Q _
_ n TE sec.- 198'1 SCat ,q, iii31 1-
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t) 116 ClJ-'e /vL, ff 7 --0 AT /ZL G9TGff lV ; .
Of Certificate Of No Appeal
-MICH Q AEi E.
PER RrliiLT I Clerk of The Town Of Lexington, Massachusetts, hereby certif•
i
? thJt the notice of approval of this plan by: Thalazinyion Ptarw+ii
" cfYiL Board has been received E recorded at this office and no appea
•4 was received during the 2Q days next *!,ter such receipt and
~ t$j rea#xd" of such notice. -
6� Signature
Date :, _ f
vvvvvv�i »�utiiiuxm711kzi/i Approved By Th* L*xIngtonPlanning Board "
��0����5SPCHUSEIp J��i�
¢y to
t& Planning 504 &Amn
� � r
Date:
pp� artt
CAMAGE,DR
M'lxxft�6tfPT
ZEAL rr -,F0WJ L®xMgtong Massishi(sette -
Owner of tecor _
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PFAL rr rxdrST DIEFAINIffIVE
S T r O _
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