Infiltration Pond Location Single Proposed Downgradient Monitoring - - PowerPoint PPT Presentation

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Feb 16, 2023 338 likes •433 views

Infiltration Pond Location Single Proposed Downgradient Monitoring Well Groundwater Contours GHD Comments on GW contours GHD groundwater contours are limited by a lack of borehole data to the West and East of the site. Aquifer

SLIDE 1

Infiltration Pond Location Single Proposed Downgradient Monitoring Well

SLIDE 2

Groundwater Contours ‐ GHD

SLIDE 3

Comments on GW contours

GHD groundwater contours are limited by a lack of borehole data to

the West and East of the site.

Aquifer conditions and hydraulic gradient to the East of site are

poorly understood.

GWS modelled the hydraulic gradient using all available groundwater
elevations. Our analysis does NOT match that of GHD.
Proposed MW location may not actually be downgradient of

infiltration pond.

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GHD Hydraulic Gradient GWS Hydraulic Gradient MW location proposed despite little understanding

f hydraulic gradient

Infiltration Pond

Groundwater Contours – GW Solutions

SLIDE 5

Bedrock Topography Contours ‐ GHD

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Comments on GW Monitoring

There is insufficient characterization of the groundwater regime at

both the eastern and western property boundary.

Groundwater transiting the property has the potential to “daylight”

approximately 2 km east of the site in wetlands and small tributaries to Quinsam River.

Due to the high permeability of the aquifer, the recommended

groundwater quality monitoring wells may be inadequate in number and location to intercept a potential plume emanating from the site.

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Infiltration Pond/Recharge “Regional” Groundwater Discharge? Local Groundwater Discharge? Unsaturated Saturated Water Table Groundwater Divide?

Hydraulic Gradients

BH1‐16 MW2a‐16 Rico Lake

SLIDE 8

Water Quality/Monitoring Well Array Needed Test Boreholes and Monitoring Wells Needed