Problem is greater if it also involves contamination of ground/well water for the property, which can make the job hit $100,000.Besides the testing, excavate the contaminated soil, recover pooled oil from the area, other biological or chemical additives used to help remove oil contamination.

Contaminated soil can leach out chemicals every time the water table gets high or even when stormwater travels thru the soil on its way down to the water table.

Recently looked at a 100k sq ft building that was 10% full and the chemicals used in the chiller were not monitored.  

I told him he needs to keep pets off the lawn for an hour after the gardener comes for the first time, and he asked if they would be spraying "toxic chemicals." 

You can find out the amount of water used by taking pool measurement and checking on line,, they'll have the info because this is used to calculate chemicals needed to maintain the pool.Was the well disclosed on your purchase of the property,, If it's listed and now in your name then your the sole owner..

(includes testing, chemicals).

They skip the worst days - my guy says anytime temps are below 32 for 24+ hours - but otherwise they use some chemicals in it and cover it.

chemical applications are really cheap maintenance if applied correctly.Renters wont take care of your place like you do.

Inspector suggested non repellent liquid chemical around foundation which is less expensive.  

It's odd that in Oakland where it's already anti-landlord they are now pushing for harsher rent controls.