Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance

Section 19 Disposition versions

2020-12-31

19. The plans and specifications must contain clauses requiring the contractor to

(1)  prepare, for the duration of the excavation, backfilling and soil levelling work and according to the work phases, an erosion and sediment control program on the work site that includes

(a)  measures to divert storm water from zones adjacent to the work site and prevent the water from passing on the work surfaces;

(b)  protection measures to prevent and avoid any soil loss caused by storm water;

(c)  measures to drain storm water outside the work site; and

(d)  a plan that localizes the measures mentioned in subparagraphs a to c;

(2)  implement measures to intercept suspended matters and any material displaced by storm water flow from the work site;

(3)  delimit the site zones and the material storage zones;

(4)  delimit machinery traffic surfaces and protect them;

(5)  implement, for the duration of the work, measures to protect or cover bare soil, the granular material storage zones and steep slope zones against washout, gullying and transportation of particles during rainy weather;

(6)  provide measures to reduce the concentration of suspended matters contained in storm water, before being drained outside the work site, to a value not exceeding the sum of the typical natural or ambient concentration of the receiving lake or watercourse at the discharge point after at least 5 days after a rain event is observed at the work site, plus 25 mg/L, or to intercept particles of a size equal to or greater than 120 μm during a rain event having a total height of 25 mm for measures whose design is based on volume, or having an intensity of 30 mm/h for measures whose design is based on flow.

The measures must resist to the rain events that have a return period corresponding at least to the values indicated in Table 3.1:

Table 3.1 Return periods of rain events

Duration of the measure	Return period (year)
< 12 months	1
between 12 months and 36 months	2
between 3 years and 5 years	3
over 5 years	5

(7)  implement measures to revegetate bare soil within 5 days following the end of the work and, if the revegetation cannot be done within that time, apply bare soil protection measures adapted to the slopes involved until the revegetation is carried out; in the latter case, revegetation must be carried out not later than 8 months following the end of the work; and

(8)  provide for the measures applicable to preparation work on the storm water management system in order that it is carried out only when the tributary surfaces of the system do not contain or are not likely to contain bare soil or that it is carried out in a way as to protect or isolate the storm water management system from storm water coming from the work site until the tributary surfaces of the system no longer contain or are no longer likely to contain bare soil.

The plans and specifications must describe the storm water management systems whose geometries and configurations are similar to those modellized in the computer models used, if applicable.

O.C. 871-2020, s. 19.

Not in force

In force: 2020-12-31

19. The plans and specifications must contain clauses requiring the contractor to

(1)  prepare, for the duration of the excavation, backfilling and soil levelling work and according to the work phases, an erosion and sediment control program on the work site that includes

(a)  measures to divert storm water from zones adjacent to the work site and prevent the water from passing on the work surfaces;

(b)  protection measures to prevent and avoid any soil loss caused by storm water;

(c)  measures to drain storm water outside the work site; and

(d)  a plan that localizes the measures mentioned in subparagraphs a to c;

(2)  implement measures to intercept suspended matters and any material displaced by storm water flow from the work site;

(3)  delimit the site zones and the material storage zones;

(4)  delimit machinery traffic surfaces and protect them;

(5)  implement, for the duration of the work, measures to protect or cover bare soil, the granular material storage zones and steep slope zones against washout, gullying and transportation of particles during rainy weather;

(6)  provide measures to reduce the concentration of suspended matters contained in storm water, before being drained outside the work site, to a value not exceeding the sum of the typical natural or ambient concentration of the receiving lake or watercourse at the discharge point after at least 5 days after a rain event is observed at the work site, plus 25 mg/L, or to intercept particles of a size equal to or greater than 120 μm during a rain event having a total height of 25 mm for measures whose design is based on volume, or having an intensity of 30 mm/h for measures whose design is based on flow.

The measures must resist to the rain events that have a return period corresponding at least to the values indicated in Table 3.1:

Table 3.1 Return periods of rain events

Duration of the measure	Return period (year)
< 12 months	1
between 12 months and 36 months	2
between 3 years and 5 years	3
over 5 years	5

(7)  implement measures to revegetate bare soil within 5 days following the end of the work and, if the revegetation cannot be done within that time, apply bare soil protection measures adapted to the slopes involved until the revegetation is carried out; in the latter case, revegetation must be carried out not later than 8 months following the end of the work; and

(8)  provide for the measures applicable to preparation work on the storm water management system in order that it is carried out only when the tributary surfaces of the system do not contain or are not likely to contain bare soil or that it is carried out in a way as to protect or isolate the storm water management system from storm water coming from the work site until the tributary surfaces of the system no longer contain or are no longer likely to contain bare soil.

The plans and specifications must describe the storm water management systems whose geometries and configurations are similar to those modellized in the computer models used, if applicable.

O.C. 871-2020, s. 19.