I am considering using shotcrete for lining stormwater conveyance ditches at a project site, and am trying to find any possible information on the potential for shotcrete (or other cement products for that matter) to leach selenium. Please advise if you have any information regarding this topic.

Shotcrete is a method of placing concrete. Thus, testing for selenium appropriate for concrete is suitable for shotcrete. The Portland Cement Association (PCA) has published a paper on testing of cement for various constituent components, including selenium, to meet NSF 61 requirements. Their testing showed “Values for arsenic, cadmium, selenium, and silver were all below detection limits.” The paper can be found at PCA’s website.