div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader030vdocumentsusreader030viewer20220308165b2770367f8b9a771c8b6a57html5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: Excavation Guidance - Northern Gas Networks · Title: Excavation Guidancepdf Author: NGN Subject: Guide to Excavation Keywords: Trenchs HSG47 Underground Services minimum depth Created src=https:reader030vdocumentsusreader030viewer20220308165b2770367f8b9a771c8b6a57html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divdiv class=annotationa href=http:wwwhsegovukpubnspricedhsg47pdf rel=ugc nofollow target=_blankhttp:wwwhsegovukpubnspricedhsg47pdfadiv div class=annotationa href=http:wwwhsegovukpubnspricedhsg47pdf rel=ugc nofollow target=_blankhttp:wwwhsegovukpubnspricedhsg47pdfadivdiv