Upstream Remedial Excavation Sampling

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Golder Field Technician Role

Detailed notes, pictures, logs and drawings are essential to the success of an excavation

Document personnel onsite, equipment onsite, soil movement and sampling

Be sure to note any monitoring wells that are decommissioned and take lots of pictures!

Provide guidance to the civil contractor regarding excavation boundaries and sampling

Predicted excavation boundaries will be provided

However physical observations and field screening are essential tools when directing an excavation

Collecting and logging interim and confirmatory soil samples

Every soil sample collected should be logged

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Golder Field Technician Role

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Completing Daily Monitoring Reports (DMR) and Soil Tonnage Tracking Sheets (STTS)

• The DMR is a record of the work completed onsite, signed by the site supervisor and Golder field technician

• It must be completed and provided to the IOL Project Manager on a daily basis

• The STTS is an independent estimate of soil shipped offsite, completing this form based on scale tickets is strictly forbidden

• It must be completed and provided to the IOL Project Manager every day that soil is shipped offsite

Onsite Soil Management

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The location and movement of all soil onsite must be tracked and documented by Golder field staff on a daily basis (i.e., every time soil is moved)

Potential different soil types that may be encountered during an excavation;

• Topsoil

• Non-impacted soil

• Potentially impacted soil

• Definitely impacted soil

Onsite Soil Management

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Topsoil should be stripped from subsoil before other work onsite begins

• Topsoil should be segregated from other activities onsite and not disturbed during the course of the project

Non-impacted soil – field screening and visual observations indicate that the soil has not been impacted by hydrocarbons.

• This soil may be used to backfill the excavation after laboratory analysis confirms that the soil meets criteria

Onsite Soil Management

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Potentially impacted – field screening and visual observations indicate that the soil has been impacted by low levels of hydrocarbons which may exceed criteria.

• This soil may be used to backfill the excavation after laboratory analysis confirms that the soil meets criteria

Definitely impacted – field screening and visual observations indicate that the soil has been impacted by levels hydrocarbons which certainly exceed criteria.

• This soil cannot be used to backfill the excavation unless treatment indicates that regulatory criteria have been met

Sampling Requirements

Excavations on upstream sites are divided into four categories based on the size of the excavation and the sampling requirements for each category are different

Small and shallow

Small and deep

Large and shallow

Large and deep

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Sampling requirements:Small and Shallow

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Area: < 50 m2

Depth: < 1.5 m

Excavation Wall Width: 5 m (max)

• Field Screen: 1/metre vertically

• Submit: 1 sample/vertical metre

Base samples

• Minimum of 3 samples submitted from different areas of the floor

Sampling requirements : Small and Deep

Area: < 50 m2

Depth: > 1.5 m

Excavation Wall Width: 5 m (max)

Field Screen: 1/metre vertically

Submit: 1 sample/3 vertical metres

Base samples

Minimum of 2 samples submitted from different areas of the floor

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Sampling requirements : Large and Shallow

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Area: > 50 m2

Depth: < 1.5 m

Excavation Wall Width: 5 m (max)

• Field Screen: 1/metre vertically

• Submit: 1 sample/vertical metre

Excavation Base

• Field Screen 1 sample/ 5x5m grid

• Submit 1 sample /10x10m grid for an excavation with 50 – 625 m2 floor area, or

• Submit 1 sample /15x15m grid for an excavation with 625 - 1600 m2 floor area

Sampling requirements : Large and Deep

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Area: > 50 m2

Depth: > 1.5 m

Excavation Wall Width: 5 m (max)

• Field Screen: 1/metre vertically

• Submit: 1 sample/3 vertical metres

Excavation Base

• Field Screen 1 sample/ 5x5m grid

• Submit 1 sample /10x10m grid for an excavation with 50 – 625 m2 floor area, or

• Submit 1 sample /15x15m grid for an excavation with 625 - 1600 m2 floor area

Soil Pile Sampling

Soils are stockpiled based on physical field screening methods

Stockpile sampling requirements differ based on the type of soil in the pile

Non-impacted

Potentially impacted

Definitely impacted

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Soil Pile Sampling

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When obtaining samples from soil stockpiles, an excavator or backhoe should be used to move the soil

• Discrete samples for lab submission should be taken randomly from within the soil pile at a number of different depths

• For soil piles <100m3, a hand auger or shovel may be used to obtain samples

Soil Pile Sampling – AB/SASK

For soil piles in AB and SASK <3000m3, the following should be field screened and submitted;

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Stockpile Volume Number of Samples

<375 m3 4

376 – 750 m3 5

751 – 1,500 m3 6

1501 – 3,000 m3 7

Soil Pile Sampling – AB/SASK

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For 3,000 m3 to 4,500 m3, collect one sample for every 500 m3

of soil over 3,000m

For soil piles >4,500 m3, a site specific soil sampling frequency

should be developed

Soil Pile Sampling - BC

Stockpile (<500 m3) of non-impacted and potentially impacted soil

Field screen• One sample for every 10 m3 of soil

Laboratory submission• The worst case sample(s) should be submitted

• Submit one sample for every 25 m3 of soil (one of three field screening samples)

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Soil Pile Sampling - BC

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Stockpile (>500 m3) of non-impacted and potentially impacted soil

• Split the stockpile into smaller stockpiles (200 -500 m3) and sample as individual piles

Stockpiles of definitely impacted soil of any volume

• One sample for every 200-500 m3 of soil submitted to the laboratory (worst case)

This sample frequency is designed to meet regulatory requirements in BC

• Refer to IOL POP #104, pg 47–50 for further details

Soil Pile Sampling

IOL POP #104 outlines the statistical analysis to be completed to determine if a soil pile meets that analytical requirements

See page 53 of the POP for details

Specific requirements are outlined for use in BC based on regulatory requirements

See page 50 of the POP for details

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