Could someone help me with this sewage plan?

vendredi 15 mai 2015

Attachment 14482

I am thinking about building another unit down the back for my parents but this sewage plan from dial before u dig is abit worrying..I am totally new to building so I am just wondering if it is allowed to build over the red line which I assumed to be a sewer? what does it mean by 150CONC?

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Could someone help me with this sewage plan?

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