Preface; Assessing Ecological Risks of Produced Water Discharge in Waves; A Comprehensive Material Balance Equation with the Inclusion of Memory during Rockfluid Deformation; A Relation-analysis-based Approach for Assessing Risks of Petroleum-contaminated Sites in Western Canada; A Two-step Modeling Approach for the Recovery of Free Phase LNAPL in Petroleum-Contaminated Groundwater System; Improved Model for Predicting Formation Damage Induced by Oilfield Scales; Review of the Optimization Techniques in Groundwater Monitoring Network Design for Petroleum Contaminant Detection; Effect of Oilfield Sulphate Scales on Productivity Index; A Monte-Carlo Simulation Based Assessment Approach for Analyzing Environmental Health Risks from B.T.E.-Contaminated Groundwater; Exact Solutions of Systems of Linear Integro-Differential Equations Using the HPM; Natural Additive for EOR Scheme during Chemical Flooding & its Environment Friendly Sustainable Application; Characterization & Separation of Oil-in-Water Emulsion; Index.