Marcella A. Caldwell, R.G.



Ms. Caldwell is a licensed geologist and hydrogeologist and has over 18 years of experience as an environmental consultant and state regulator predominantly in site characterization and hazardous material remediation. Her experience includes managing soil, groundwater, and surface water investigations while guiding clients in maintaining regulatory compliance. Ms. Caldwell has authored Remedial Investigation and Feasibility Study (RI/FS) reports, Quality Assurance Project Plans (QAPPs), Phase I and Phase II Environmental Site Assessments (ESAs), Environmental Impact Statements (EISs), Sampling and Analysis Plans (SAPs), and Health and Safety Plans (HASPs). She has extensive fieldwork experience in obtaining groundwater, surface water, soil, and geophysical data including supervising field teams and subcontractors and has built successful working relationships with clients. She has been hazardous waste trained and possesses a strong awareness of workplace safety.



-M.S. (Geosciences) University of Arizona, 2000
-B.S. (Geology) Old Dominion University, 1998
-B.F.A. (Graphic Design) Old Dominion University, 1993


Registered Professional Geologist, Arizona Registration No. 66773
Licensed Hydrogeologist, Washington Registration No. 1446
OSHA 40-hr HAZWOPR – 2003; Annual 8-hr Refresher

Representative Experience

Hydrogeologist for a supplemental Site Characterization Investigation at the Former Galena Air Force Station, Galena, Alaska. Oversaw field tram members and subcontractors during the installation of 4 groundwater monitoring wells. Conducted soil sample collection.

• Lead Technical Reviewer for a reimbursement program in Phoenix, Arizona. Lead remedial consultation meetings with clients. Review and approve budgets and work plans. Mentor junior staff. Deliver internal and external presentations. Develop effective working relationships with clients and their consultants.

• Project Manager for a railway client in Oregon and Washington. Managed petroleum contaminated projects with budgets totaling approximately one million dollars. Prepared proposals and reports. Planned groundwater, soil, and air quality sampling events and evaluated analytical results. Compared analytical results to state and federal cleanup regulations and provided clients with regulatory compliance recommendations. Developed financial forecasts. Oversaw field staff in data collection. Prepared Phase I ESA’s.

• Assistant Project Manager for a Remedial Investigation/Feasibility Study (RI/FS) for a Superfund Site in Black Eagle, Montana. Assisted with preparation of the QAPP, SAP, and RI/FS reports in support of the collection of over 200 borings to evaluate appropriate cleanup action. Managed field team during data collection.

• Lead Hydrogeologist for a groundwater dye tracer study in Corvallis, Oregon. Designed diverted surface water infiltration and groundwater dye tracer tests to evaluate subsurface hydrogeologic properties and surface water/groundwater interactions for proposed constructed infiltration basins.

• Project Manager for groundwater monitoring studies in Tacoma and Bainbridge Island, Washington. Managed and reported on groundwater data collection and analysis to meet established state remedial goals for various contaminants under Washington State’s Department of Ecology’s Voluntary Cleanup Program (VCP) and by order of Consent Decree. Oversaw the installation of monitoring wells.

• Project Manager and Lead Hydrogeologist for groundwater studies in Tacoma, Washington. Designed a groundwater dye tracer study to evaluate high pH groundwater entering a nearby waterway. Managed the groundwater data collection and analysis. Prepared recommendations for remedial approaches.

• Lead Hydrogeologist for conceptual site models for sites in Oregon and Michigan. Conducted research level hydrogeologic characterizations for proposed onsite wastewater treatment and former pulp mill sites.

• Lead Hydrogeologist for a Phase II ESA in Ketchikan, Alaska. Coordinated and conducted hazardous material data collection and analysis. Supervised junior field staff, coordinated laboratory activities, and wrote Phase II ESA report.

• Task Leader for a transportation project in Seattle, Washington. Wrote hazardous material discipline reports. Coordinated and led field sediment data research and collection.

• Task Leader on a water quality study for relicensing of a hydroelectric dam for in Sultan, Washington. Coordinated and conducted monthly surface water sampling and laboratory activities. Wrote quarterly and annual reports.

• Field Team Leader for a Superfund Site in Bellingham, Washington. Coordinated and supervised several team members to complete soil sample collection and sample quality assurance/quality control (QA/QC) under a tight schedule during Phase I, II, and III ESA evaluations. Wrote sample addendums for the SAP. Evaluated data to determine if cleanup levels have been met.

• Field Team Leader for a beach sediment sampling study for a Superfund Site on Bainbridge Island, Washington. Managed a field team conducting sediment characterization to determine the extent of contamination at Eagle Harbor beach. Supervised the drilling and sampling activities that resulted in 110 borings and over 200 samples in nine days, thereby completing the field sampling under budget and on schedule.

• Lead Field Geologist on a remedial excavation for a client in Seattle, Washington. Supervised the excavation of contaminated soil that resulted in the separation of approximately 3,000 cubic yards of clean overburden soil from contaminated soil. The preserved clean soil was re-used as backfill after completion of the excavation therefore saving the client approximately $30,000 on backfill material expenses.

• Lead Field Geologist for a Brownfield Redevelopment Project in Seattle, Washington. Supervised the excavation of approximately 4,000 cubic yards of contaminated soil including some that required special handling under the EPA Toxic Substances Control Act (TSCA).

• Lead Field Geologist supervising the decommissioning of underground storage tanks (USTs) as a Washington State Certified UST Site Assessor.

• Hydrologist and Assistant Project Manager for a water-use study in Yakima, Washington. Managed the schedule and budget for a section of the larger water-use study. Compiled and analyzed various types of water-use data. Wrote reports and presented results at symposiums. Supervised student employees. Assisted with proposal writing and research.

• Hydrological Technician for a groundwater recharge study in Tucson, Arizona. Collected, analyzed, modeled, and interpreted geologic, hydrologic, and geophysical data (seismic refraction, electromagnetic, micro-gravity and electrical resistivity) to identify and map stream channel deposits as part of a larger aquifer recharge study. Assisted with monitoring well drilling and installation. Collected and analyzed soil samples. Assisted with report writing and presented findings at conferences.


Hoffmann, John P., Ripich, Marcella A., Ellett, Kevin M., 2002, Characteristics of Shallow Deposits Beneath Rillito Creek, Pima County, Arizona: U.S. Geological Survey Water-Resources Investigations Report, 01-4257, 51 p., 3 plates.

Ripich, Marcella A., 2000, Delineation of Subsurface Deposits Through the Integration of Geological, Geophysical and Hydrological Data, Rillito Creek, Tucson, Arizona [MS Thesis]: Tucson, University of Arizona, 59 p., 3 plates.



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