Cy EXCAVATION BELOW THE LEVEL OF PIPELINE ROAD.

Excavations below the established level of Pipeline
Road are tnrasible and would have the following advantages and
disadvanteges:

Agvantages

Such excavations, which would probably be a source of
excellent gravel, could form attractive lakes, as
provided for in the LaFarge Agreement,

Could serve as settling basins for an interim period
acd as such be gradually refilled with the silts and
clays not required in the operation.

3. They could be backfilled as in the form of a dump for
unwanted or substandard natural materials.

Disadvantages

See

i. The necessity to remove gravel under water.

2. Washouts could negate the use of these excavations as
settling basins.

If these excavations are to be retained as artificial
lakes, then there would have to be an adequate water
supply to prevent stagnation,

Should construction ever be anticipated in the area of

any of these lakes that have been filled by settled

solids or backfill material, then the definite possibility
of foundation problems would have to be anticipated,

Where an operator wishes to excavate below the level
of Pipeline Road, it is recommended that thia be done at the
Giscretion of the Engineering Supervisor and that authority be
given by writing on the submission of location plans prepared
by a suitably qualified professional engineer.

De. RECLAMATION OF THE GRAVEL PIT AREAS.

The existing bylaw does not seem to contain definite
requirements for reclamation,

Tt is suggested that By-Law 1489 be revised by adding
the following subsection:

-~6-
“Section 6(h},

The fi1rished slopes of the areas affected by the sori
removas shall be such that the Slopes will be stabte,
but in no case shall the slopes be greater than one (1}
Zoot rise in one and one-half (14g) Jeet of run, with
fifteen (15) fect wides benches at fifty (50) fret
vertical intervals, The surfaces of ureas affected by
the soil removal should be reclaimed such that the surface
3s completely coveree by a blanket of soil net less than
eight (8) inches thick, which will support Growth of grass
and trees to the standard defined in this Section 6(hi.
This blanket of soil, which nest Le stuble, may be composed
‘Gil native to the area, cariched Sy addiction of
fertilizer. Grass and trees shal} be firmaly estadlished
in the areas being reclaized to the setistaction of a
responsible District of Coquitlam authority”.

In order that the landscaping provisions be net by a
gravel pit operator when the operation is terminated, either after
all allowable gravel removal is Couple cd or if the operator dis-
continues his operation before all pessible gravel has been
removed (the latter case occurring if the quality of the material
to be excavated makes the operation uneconcmical, or if the
Gperation ceases for any other reason before ultimate gevelopeent},
the gravel pit operator should be required to furnish us with «
Suitable Performance Bond.

It is therefore recommended that By-Law 1459 de revised
by adding the following subsection:

“A good and sufficient bond under seal by the applicant shail

Cause land restoration works to be effected to a standard cf

Eight Hundred (800) trees per acre being apportioned by aunxber

as follows:

One Hundred and Sixty (160) Douglas Pir (Pseudo Tsuga Bouglasi)
per acre,

One Hundred and Twenty (120) Hemlock (Tsuga Heterophylia) per
acre, :

Eighty (80) Red Cedar (Thuja Plicata)

Forty (40)vine Maple (Acer Circinatum) per acre
Pour Hundred (400) Red Alder (Alnus Rubra) per acre, and

Seventy-five (75) lbs. of evenly mixed grass seed per acre
to consist of:

Creeping Re@ Fescue- Twenty (20) lbs. per acre,
Hard Pescue - Twenty (20) lbs. per acre,
Perennial Rye Grass - Twenty (20) lbs. per- acre,
Annual Rye Crass - Ten (10) lbs. per acre,
Crown Vetch ‘> Five (5) lbs. per acre,
and in accordance with the said vermit and this By-law and
performance hond acceptable to the Engineering Supervisor,
the principal amount of Two Thousand Five Hundred Dollars
($2,500.00) per acre of the areas affected by the sorl
vemoval permit {such areas to include excavation areas,
Purification facilities, storage arcas, work areas, stockpile

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