Moved into new house 3 months ago, this week noticed some not very pleasant smells in kitchen. Upon investigation looked like kitchen drain/grid was blocked, removed grid and unclogged debris, water level then dropped dramatically only to find an original drain with grid approx 12 inches below due to built up patio. Looks like concrete has been formed above and around original drain grid which is preventing me from removing original grid cover, there is no concrete on back wall therefore when blocked the water has been sitting permenantly against house. The original kitchen(long since removed) grey waste pipe is also there which enters kitchen and not connected to anything, with no trap smells have been entering the kitchen. Since unclogging and getting thetwater back below original grid there have been no smells. So I'm looking for advice on correct solution? I could extend the black drain pipe down to level of original drain but there would still be problem of potential splashing on bricks to back wall. I also need to remove grey pipe and fill hole, this would be tricky as access is difficult. Any ideas people? See attached pic. Many thanks.
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