If on pipe, just make sure its wrapped in plastic. 

Pre-plastic, it seems like septic tanks can either be concrete or steel.  

Remove all flooring boards and replace with plastic decking for a maintenance free repair? 

You can get a plastic cover 

That could be plastic ( Omni roll, snow country etc).

I put our used winter boot plastic trays under the cabinets & that also catches all the other spillages they have with their cleaning supplies. 

You might look for other items that suggest drug use or sales like corners cut out of plastic sandwich bags, or boxes of the tiny 2 inch by 2 inch zip lock bags, etc. 

Welp...14k on one car29k on the other25k in plastic4k in medicalLow interest on the cars, teens on the plastic, none on the medicalNet monthly income is about 10k (after taxes, health, dental, vision, 401k and FSA deductions).  

That goes behind the sink and is the late 70's early 80's plastic tiles.... yuck!!

You may see yard gnomes, plastic flowers, statues, it might not be your taste but you know these people have pride of ownership.