API RP 51 pdf download Onshore Oil and Gas Production Practices for Protection of the Environment 5.3.5 The operator should hold a pre-construction meetingwith the contractor(s) to establish environmental and safetyresponsibilities along with desired objectives of the project.5.3.6Field inspections and lab analysis of soil samplesmay be used to assess soil erosion hazards and slope stability.Properties of soils,length and gradient of...