HomeMy WebLinkAbout1974-11-27 Board of Survey Minutes November 27, 1974
' Meeting of the Board of Survey opened in Room 16, Munici-
pal Building at 8:30 P. M.
Present were Chairman Blood, Secretary Reed, Board Members
Russell , Dustin and Price and Superintendent Louanis.
Minutes of the previous meeting were accepted as read.
Read letter from John F. Beaudoin, Chief-of-Police
wherein he states he has no negative comments to make rela-
tive to the traffic pattern in the plan submitted to the
Board on September 30th, 1974 for the development of land in
the Walnut Street area. Mr . Price requested that a consultant
engineer be asked for an opinion as to the impact of extra
traffic on South and Walnut Streets if the State Department of
Public Works can not assist the Board of Survey in this matter .
Mr. Dustin also requested a ruling on Section 81-M by Town
Counsel . Mr . and Mrs. Robert Lawlor of 88 Sturges Road re-
quested a copy of the minutes in order that they may acquaint
their neighbors of the status of the proposed development. It
was moved, seconded and voted that the Superintendent be in-
structed to prepare a letter concerning the Preliminary Plans
concerning the Hopkins property, the letter to include the
following information:
1 . Sewer easement has insufficient cover. Minimum cover over
top of pipe must be 3.01 . Also sewer manhole rim grades
must be set at least one foot higher than the highest
possible surface water elevation in the drainage reten-
tion basin.
2. Drainage Retention Basin
a. The retention basin as shown on the plan indicates an
overlap onto abutting property. The retention basin
must be entirely within the proposed subdivision
boundaries.
b. The capacity of the basin will have to be calculated
with 2a changed.
c. The drainage retention basin must be by design no
greater than two feet deep, unless provisions are
made to enclose the basin with a fence. ,
d. The proposed 27" RC drain at the 1% slope for the
outlet from the drainage retention basin is totally
inadequate to retain the required runoff. A detailed
inflow-outflow hydrograph for the proposed subdivision
will have to be determined. An analysis of the exist-
ing downstream drainage system will also have to be
provided in order to determine the impact the pro-
posed drain will have on the existing system. All
RC drain pipes must be considered as having a maximum
Manning Coefficient of 0.0013• From the analysis of
the downstream system a maximum discharge from the
proposed subdivisionnest be determined and the re-
quired retention basin storage capacity computed.
Different storms and durations must be run through
model to show the relationship of the peaks and to
insure that they are not simultaneous . All hydraulic
computations must be shown to support the design.
3. The drainage retention area will have to:
a. Have access via an easement etc. '
b. Have area as part of the abutting lots as green
area so that the retention area has some legal
frontage on an approved street.
4. Topo incomplete from lots 21-29 and must be shown on plan.
5. Show profile on all drainage
6. Show drainage easements
7. Show gutter profile at all intersections
8. Slope easements and corner roundings must be obtained on
South Street
9. Present an analysis showing the impact of the expected
traffic into and out of the development on the adjacent
public ways.
Meeting adjourned at 9: 30 P.M.
Respectfully submitted,
a r° G�
Secretary