Slab cracking around penetrations

I was hoping to see what others with experience would suggest.

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My foundation is slab on improved grade. The mat in the slab is #3 rebar 24&#; OCEW. I was wondering if additional reinforcement is recommended around pipe penetrations within the slab to help prevent cracking and if so what is preferable: 4×4&#; steel mesh, rebar on diagonal, etc?

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I have posed this question to the structural engineer but he won&#;t answer&#;I guess because its not a structural question?

Thanks. I tried to attach a photo for clarification.

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