Utility trench in contaminated soil
Utility trench in contaminated soil
(OP)
I am currently looking into the installation of utility lines (specifically sanitary sewer and water) through a contaminated site. The proposed pipes would travel through an asbestos pile with a 2' soil cap. I did some research to try and find the proper backfill for utility trenches in contaminated areas but came up empty. The research I did find tends to lean on flowable fill to reduce the posibility of contaminated material migrating along the trenches. Any help is appreciated.
I need to prepare a construction detail for the work as well. If anyone has a link to one that would be great too.
I need to prepare a construction detail for the work as well. If anyone has a link to one that would be great too.
RE: Utility trench in contaminated soil
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Utility trench in contaminated soil
RE: Utility trench in contaminated soil
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Utility trench in contaminated soil
RE: Utility trench in contaminated soil
Horizontal directional drilling for installing the utilities is a good option to minimize the disturbance. However, this is not an option if you are installing gravity sewer. You could possibly jack and bore a casing pipe if you have gravity sewer.
Depending on the amount pipe you need to get through the contaminated area, boring and directional drilling may not make economical sense . If you are looking to open cut the trenches, it would be wise to avoid full depth flowable fill as backfill. This is expensive and requires special disposal of all of your spoils. You could possible place flowable fill or concrete dams intermittently along the trench to minimize the contaminated groundwater from migrating along the trench. When you strip the soil cap, this should be seperated from the sub-soil and placed on plastic so that it can be re-used as a soil cap after backfilling the trench.