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Can recommend some great guys, because we recently faced the same problem. In Calgary, with our soil, this is a classic problem. We turned to a local contractor who really understands our local nuances. I liked that they don’t just take your money, but do a proper diagnosis and offer reasonable repair options. Their prices are very fair, with no hidden fees, which is rare in Calgary these days. I recommend not delaying with that green grass; it’s better to call them now, they’ll come quickly and sort everything out.