• Protecting Water and Farmland in Simcoe County

Midland council to discuss leaking landfill

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In Simcoe County
Jan 25th, 2010
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The subject of allowing testing by the County of Simcoe on on Wilson Road is on tonight’s Midland Council meeting agenda (Monday, January 25). The County has to test to determine the extent of a leachate plume extending from a closed landfill site and ensure there is a proper attenuation zone to allow for the contaminants to dilute.

SDS41 has reviewed the 2007/2008 Biennual Monitoring Report filed by Simcoe County’s consultant Jagger Hims (now Genivar) and note the following
Executive Summary, Page i
An inorganic plume extends in a north and northwesterly direction within the upper and lower portions of the sand unit beneath the County Forest lands and towards the southern portion of the Unimin property.
Page ii
Within the lower portion of the sand unit, there is an increase in the concentration of the leachate affected groundwater at Monitor 20-11 northwest of the site.  Thus it appears that the leachate influence is expanding in a northwesterly direction beyond BH 20 due to the movement of a slug of contaminants within the ground water system.There is land owned by the County down gradient of BH 20 to provide additional attenuation. However, based on the more recent data, the private property to the north of the County forest may be also needed for attenuation.
Trichloroethylene (TCE) continues to be locally present (a) in most of the groundwater monitors north of the landfill site, (b) in the monitor laterally to the west of the site, (c) in the monitor to the east of the site, and (d) at the monitor location south of the refuse disposal area.  The data suggest other sources of TCE in addition to the landfill site that are affecting groundwater quality to the west and south of the refuse disposal area.
Page 51
There is an area of leachate impacted groundwater within the upper and lower portion of the sand unit. The Ministry of the Environment Guideline B-7 criteria are exceeded for some parameters beneath the site boundary.
Trichloroethylene (TCE) is locally present in the groundwater at locations northwest of the site within the plume, south of the site and laterally to the west of the site and to the east of the site.

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