Mara Okonkwo

Profile

Licensed Professional Engineer (PE) with 9 years of experience in remediation design, regulatory compliance, and environmental impact assessment across oil-and-gas and municipal sectors. Specializes in soil and groundwater remediation using in-situ chemical oxidation and bioremediation, with a strong record in CERCLA and RCRA project management. Delivered $4.2M in remediation cost savings over four years by optimizing site characterization workflows and negotiating accelerated regulatory closures.

Work Experience

Senior Environmental EngineerMar 2020 - Present

Clearwater Terra Consulting, Denver, CO

Led remedial design and construction oversight for 14 Superfund-adjacent sites across Colorado and Wyoming, reducing average time-to-closure by 22% through phased interim measures.
Managed a $6.8M CERCLA remediation contract, coordinating a cross-functional team of 11 engineers and field technicians while maintaining a 98% on-schedule deliverable rate over three years.
Developed a groundwater monitoring optimization plan that cut quarterly sampling costs by $310,000 annually without compromising regulatory reporting accuracy.

Environmental Engineer IIJun 2016 - Feb 2020

Apex Resource Management Group, Houston, TX

Designed and permitted in-situ chemical oxidation (ISCO) treatment systems for 8 petroleum-impacted sites, achieving >90% reduction in target contaminant concentrations within 18 months of injection.
Prepared Phase I and Phase II Environmental Site Assessments for 40+ commercial and industrial properties, supporting $220M in real estate transactions with zero post-closing liability claims.
Authored SPCC plans and stormwater pollution prevention plans (SWPPPs) for 12 upstream oil-and-gas clients, resulting in zero NOVs across a 4-year compliance cycle.

Environmental Engineer IAug 2014 - May 2016

Meridian Environmental Solutions, Fort Collins, CO

Conducted soil and groundwater sampling at 25 active investigation sites, processing over 1,200 analytical samples per year with a data validation error rate below 0.8%.
Assisted senior staff in preparing remedial investigation and feasibility study (RI/FS) reports submitted to CDPHE, contributing to three sites achieving final remedy selection within the project schedule.
Built an internal GIS database integrating boring logs, contaminant plume maps, and regulatory milestones, reducing report preparation time by 30% across the project team.

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