Forthbank Wind Energy Development - Partnerships for Renewables

Forthbank Wind Energy Development
to the quantity of water which was classified as “good” and the higher vulnerability associated
with part of the site .
13.8.11 Mitigation measures include isolation of leachate during construction of the turbines and
construction of a pile cap at the base of the landfill waste material.
13.8.12 Following the identification and assessment of the sensitivity of the hydrogeology, a
comprehensive suite of mitigation measures has been incorporated into the design of the
proposed wind energy development. In addition, the EMP and specific mitigation techniques
for the construction, operation and de-commissioning phases will be implemented to protect
the groundwater from pollution. Following implementation of the mitigation measures, the
overall impact on hydrogeology is considered to be minor.
Made Ground
13.8.13 The south-eastern part of the site comprises a former landfill, and previous site investigations
have proven the depth of waste to being between 5.9m bgl and 8.6m bgl, with an unproven
depth of made ground at one location to 8.8m bgl. Made ground is also expected to be
present at the north-west of the site, particularly relating to the former airplane factory and
refuse destructor. Additionally, underground structures including railway tracks, tanks and
foundations associated with the refuse destructor may be present.
13.8.14 Excavation of the turbine foundations will cause disturbance of both landfill leachate and
landfill gas at the south-western part of the site, and may result in mobilisation of leachate and
gas. In addition, the landfill cap will also be impacted during the construction of the wind
turbines.
13.8.15 Disturbance and removal of the landfill material, as well as the presence of construction plant
may also impact on the stability of the landfill.
13.8.16 Mitigation measures include detailed geotechnical investigation and assessment and
placement of a clay seal/bentonite at the base of the excavation where the landfill cap is
impacted.
13.8.17 Following the identification and assessment of the sensitivity of the made ground, in particular
the landfill waste, a comprehensive suite of mitigation measures has been incorporated into
the design of the proposed wind energy development. Following implementation of the
mitigation measures, the overall impact on made ground is considered to be minor.
Public and Private Water Supplies
13.8.18 There were no private water supplies identified by Clackmannanshire Council within 3km of the
site and no public water infrastructure identified by Scottish Water on the site. Therefore, the
impact to private and public water supplies is negligible.
November 2010 Chapter 13 Page 38
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