THE CORPORATION OF THE
CITY OF PORT COQUITLAM

MEMORANDUM HAY 25 1987

TO: City Administrator May 21, 1987
FROM: City Engineer

SUBJECT: Replacement of Water Main In Mary HII! Road Public
Works Committee May 19, 1987

Recommendation:

That the Engineer be authorized to replace those sections
of water main under the Mary Hill Road construction which are
lald over peat and that the necessary costs be taken from the
unallocated fund for water malin replacement In the Water

Utility Capital Budget.

Background and Comments:

The 1987 Water Util ity Capital Budget includes an amount
of $80,000 which is shown as unallocated. This amount was set
aside because It was anticipated that there might be some water
mains which needed to be replaced once we started on the road
construction program. Our past experlence has been that some
of the oid water mains are constructed too high and have a very
rigid type of JolInt which cannot accept any movement of the

pipe without cracking.

The construction of Mary Hill Road startad on May 19, 1987
and we immediately discovered that a portion of the water main
is lald over a layer of peat which varies In thickness up to
approximately. three feet. It [Ss not practical to excavate this
layer of peat without causing damage to the water main. 1+
willl therefore be necessary to replace certaln sections of the

water main as construction progresses.

Test holes are being dug now to determine the extent of
the peat layer. Until this Is known and a replacement design
has been completed, It Is not possible to determine exactly
what the length of pipe to be replaced Is nor what It will
cost. However, it Is anticipated that the cost will be only a
fraction of the amount which Is Included In the budget. We
will inform Counc!! of the estimate as soon as the design has

been completed.

In the meantime, we are proceeding with design In
anticipation of Counci!!s approval of the recommendation of the

Public Works Committee.