Jasmit Bains and Jamie Laukaitis

East Midlands - centre of the ‘Industrial revolution’

FACT :

PRIDE - Partnership to Regenerate through Innovative Development the Environment of Derby

Lead to the contamination of many sites

Regeneration of sites needed

Old gas works and land fill

site

Eastern side of site – Most highly

contaminated

Old railway works

Western side of site – lower levels of contamination, consists of old

gravel pits and engineering works

The site is bounded to the North

and East by the River Derwent

Include tars, oils, phenols, heavy metals, ammonia, boron and low level radioactive materials (below landfill)

Making the solution of dig and replace impractical and uncommercial

Requires an environmentally robust remediation strategy

Longest and largest elevation area of any similar type wall in the UK

3km long 5-10m deep HDPE membrane Maximum permeability

to water of 1x10-8 m/sec

http://www.tunneltalk.com/Discussion-Forum-Jul10-Collapse-syndrome.php

A 650mm thick high-permeability layer of graded stoneProtects surface from contaminants from the action of capillary rise Encourages infiltration through the landfill

Methane gas is produced from municipal refuse tipThe trench encircled the landfill to prevent gases migrating beyondVenting pipes release methane gas safely into the atmosphere

Two on site fully engineered waste repositoriesHouse the total of 93,015m3 of contaminated wasteLocated on the south side of the site

Leachate drainage system extracts and collects contaminated ground waterCollected water is pumped to an on site ground water treatment plantWater cleaned and treated

Shortfall of 171,000m3 of material

PFA used environmentally sustainable and cost effective

Successful in raising ground and construction of waste repositories

Construction of a flood bund Raising the general level of the site

Site Boundary

Bentonite Wall

Flood Bund

Gas Vent Trench

Secondary Waste Repository

Water Treatment

Plant

Waste Repository

Thank you for listening...