$($a$)$ A relatively flat site, with good access, is to be developed for a new eight

storey office development. The site dimensions are approximately $100m$

by $100m$ and the approximate size of the proposed development is $60x$

$10m.$ A desk study has determined that the site was formerly terraced

housing, replaced in ${20}^{th}$ century by depots, warehouses and small works.

In addition, it is thought that the ground comprises roughly $1-2$ metres of

man$-$made fill material, overlying several layers of dense sand and clay

layers down to approximately $20m,$ where there is a bedrock of fissured

sandstone.

Briefly, describe the ground investigation you would propose for the site

with due consideration of value for money. Your proposal should include

any non$-$invasive geophysical techniques $($if appropriate$),$ the number and

type of invasive investigations needed $($including stating the equipment

you will specify to do this investigation$).$ In addition, you should provide

information on any in situ testing or sampling you propose.

You must provide justification for all your choices in order to gain

marks.

$($Please note you are NOT required to provide descriptions of any of the

equipment you propose or descriptions of how the tests are conducted or

describe how samples are collected, although appropriate methods

should be identified.$)$