Senior Environmental Scientist III Fullerton, CA

Are you driven to grow, lead, and make a meaningful impact? At Apex, we’re building more than a consulting and engineering firm—we’re creating a place where your career accelerates, your contributions matter, and your potential is fully realized. We believe your growth is our growth, which is why we invest in your development at every stage of your career. Here, you’ll work on projects that shape communities, protect the environment, and create lasting impact, all while being empowered with the autonomy and flexibility to do your best work.

Senior Environmental Scientist III

Fullerton, California

• Responsible for assisting municipal, utility, industrial, and commercial clients with stormwater planning and compliance efforts associated with Phase I and II MS4 permits, the Construction General Permit (CGP), and Industrial General Permit (IGP).
• Interpret complex regulatory permits, assist clients with regulatory compliance, prepare technical reports, conduct environmental compliance inspections and sampling, and complete high‑quality deliverables on time and within budget.
• Lead environmental sampling, testing, and observations, primarily surface water, stormwater, groundwater, wastewater, soil, and sediments.

• Interpret regulatory permits and formulate compliance strategies.
• Prepare comprehensive approaches, work plans, technical reports and documents (watershed management plans, stormwater management plans, annual reports, non‑stormwater discharge source assessments, adaptive management plans, compliance guidance documents, compliance reports, rain and sampling event summary reports, SWPPPs, WQMPs, etc.).
• Execute and manage field investigations.
• Manage workload of other Environmental Scientist staff.
• Prepare and monitor project budgets.
• Meet with clients regarding work and performance of the team, and regarding current and future work.
• Perform construction site and facility environmental compliance inspections (QSP, QISP, FOG).
• Conduct environmental sampling, testing, and observations (primarily surface water, stormwater, groundwater, wastewater, soils and sediments).
• Make field observations and perform data measurement and collection assignments.
• Data management and analysis (compilation, manipulation, and evaluation of data).
• Develop and implement monitoring and reporting plans and field studies.
• Perform regulatory and water quality data analyses.
• Participate in or lead technical presentations.

• BS in Environmental Science, Civil or Environmental Engineering, or a related field.
• 5+ years of professional work experience.
• Knowledge of stormwater permitting and planning; water quality monitoring; BMPs; and environmental compliance inspections.
• CPSWQ/CPESC certification.
• QSD or QSP and QISP certifications.
• Able to read, interpret, and analyze plans, technical manuals, and permits.
• Strong analytical skills.
• Attention to detail with a high level of accuracy.
• Demonstrates a strong work ethic.
• Excellent writer and communicator.
• Proactive approach – self‑starter, takes initiative, positive attitude, team player.
• Proficient in Microsoft Office Suite.
• Ability to kneel, climb, and lift up to 50 lbs.
• Valid California driver’s license and insurable driving record.

• MS or PhD in Environmental Science, Civil or Environmental Engineering, or a related field.
• Proficient with ArcGIS.
• OSHA 40‑hour HAZWOPER training.
• Perform maintenance and calibration of environmental monitoring instruments, meters, probes, and automated sampling equipment.

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