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time to go looking for a friendly farmer with a hole that needs filling in.....
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Unless its good qaulity top soil not many will want it unfortunatly.
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just tell them you are getting an austrian lodger.....
i still think you should do a test hole near the back & side walls just to see what the height of brickwork is. you may not need any retaining walls. cos the above pic looks a lot like made up ground to me, and not the original soil at all.
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you will need to make a shallow, wide footing for the wall, you may want to lay them flat way on for strength. compact the soil back in, then if you want to make a workbench, you could lay concrete about 4" thick on over the soil (on polythene), fit a timber on to the top of the wall, and leave it in there, and make sure you use strong concrete with poly fibres in it. it will last forever. pm me your email addy & i'll supply plan pics if you want.
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the big trick to laying blocks for strength is mix the mortar 4:1 & fairly stiff, then actually bed the blocks on using a lump hammer to a string & keep spirit levelling.