I own a half a duplex and owner next door drilled a 4 inch hole in the septic tank near the end on the side. Put a 4 inch pvc pipe into it silicone around pipe and this is now where all his sewage and waster water goes into. No baffle no nothing. I have been searching the net for codes on this and cant find any at all and i believe this damaged the tank. It is a plastic tank 750 gallon. I live in Pa and anyone point me in right direction or tell me if my tank is now done?