(July 2013) () BS 5930:2015, 'the code of practice for site investigations', is a UK code of practice which came into effect on 31 July 2015. Unsourced material may be challenged and removed. This article needs additional citations for. BS5930:2015 - Code of practice for ground investigations. BS 5930:2015 - British Standards available for immediate PDF download or next day delivery in printed format.