Treated wood - uptake in chemicals on berries

We have raspberries directly below a wood retaining wall that looks like they could be treated with creosote or PCBs - they don't seem to be leaching into the soil where the plants are, and are not oozing out chemicals. We only harvest at most a gallon a year from 5-6 stalks so intake is low...just wondering how much if any harmful chemicals go into the berries we eat, and if there is a lab perhaps, that offers free (or nearly free) testing for uptake.

would appreciate any advice.

Thanks Bruce