Cutting/Trimming of percolation pipes

Clarelassie

Registered User
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[broken link removed]https://www.dropbox.com/sh/xv38n63uvsvlsj7/yE3Z5w6Oh3#f:20120507_161638.jpg

Hi,
This may have been asked before, but couldn't find it in my searching on the site.

We have a 3 stage sewage system - the usual sewage tanks, then peat filtering and then these polishing filter ( I think its called - open to correction). I know we were told we can cut these ( the 2 lines of white pipes in the lawn area) down to soil level - but what should be on the cover of them? Since we moved in we have just left them alone ( busy getting the rest of the garden sorted). I think there is currently a seal on them which makes no sense in my opinion as air can't escape.

Any advice gratefully received!!
Thanks in advance!