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Environmental Team


Kurt M. Balasek, PG, CHG, QSD

Manager of Environmental Services

Mr. Balasek is a California Professional Geologist and Certified Hydrogeologist with over 30 years of experience serving a range of clients affected by environmental issues.  Mr. Balasek is the Environmental Services Manager and directs a team of highly qualified geologists, engineers and environmental scientists.

Mr. Balasek has spent his career primarily in northern and central California and has developed long and trusting relationships with key regulatory agencies, land developers and a wide range of industries.  Mr. Balasek has used his vast experience to negotiate environmental and financing aspects of various property transactions and has often been successful resolving complex problems that free up land for development, redevelopment or conservation.  Mr. Balasek has conducted of managed hundreds of soil and groundwater investigations and has developed a unique skill set centered on crisis management.  As such, Mr. Balasek and his team have a reputation for rapid response and resolution so that difficult environmental restrictions are removed in time to avoid costly delays.  Mr. Balasek also understands most common agricultural practices and has worked closely with ranchers and farmers to address constantly changing state and federal regulations.  Mr. Balasek is always available to spend time discussing environmental aspects of proposed projects and has based his career on developing a reputation as a trusted and confidential advisor.



Dennis B. Nakamoto, PG, CHg, CEG

Senior Hydrogeologist

Mr. Nakamoto, a California Professional Geologist, Certified Engineering Geologist, and Certified Hydrogeologist, has been employed in environmental consulting since 1978. His decades of environmental consulting encompass groundwater studies, site characterization studies, remediation construction oversight, regulatory compliance, and human health risk assessments. He manages work and assists clients on projects for contaminants including volatile organic compounds, petroleum hydrocarbons, metals, chlorinated hydrocarbons, pesticides and herbicides, and asbestos in soil, water and air.

Mr. Nakamoto’s experience encompasses studies of groundwater resources and supply including well design and installation, well rehabilitation, and aquifer characterizations. He has filled key roles in Community Relations Plan implementations, coordinating with project stakeholders, and participating in public meetings to disseminate project information and advocate project goals.

He is highly experienced in interpreting geophysical data from borehole electric logs, gamma-gamma and natural gamma logs, neutron logs and acoustic logs. He has designed monitored construction of zone-specific multiple completion and nested monitoring wells, extraction wells, recharge wells, and injection wells. Mr. Nakamoto also holds professional licenses in Oregon and Wyoming.



Matthew A. Taylor

Supervising Environmental Scientist

Mr. Taylor has expertise in performing groundwater pumping tests, air sparging and vapor extraction pilot tests, and supervised construction, operation and maintenance of remediation systems. Employed in environmental consulting since 1990, he also has prepared hazardous materials management plans, spill prevention control and countermeasure plans, risk management and prevention plans, risk-based corrective action plans, air discharge permit documentation and National Pollutant Discharge Elimination System (NPDES) permit applications.

His experience includes preparation of numerous indoor air quality evaluation projects for Sacramento area hospitals, schools, commercial buildings, law firms and residential developments. Mr. Taylor is a member of the Groundwater Resources Association of California and the Sacramento Claims Association.



Nancy M. Malaret

Senior Environmental Scientist

Ms. Malaret, who has worked in the environmental field since 2003, performs Phase I Environmental Site Assessments according to ASTM E1527-13 and All Appropriate Inquiries (AAI) guidelines. She assists with the coordination of sampling water wells and developing Phase II soil sampling plans. She uses GIS mapping techniques to identify private potable wells located near commercial and industrial facilities that may have contaminated the groundwater. She coordinated sampling of the wells and analysis of water samples collected, and has conducted human health risk assessments on sites with volatile organic compounds, semi-volatile organic compounds, and metals contamination.

Her investigations have involved multiple parcel sites with extensive history, large-scale residential subdivisions, office buildings, gasoline stations, dry cleaners, and heavy equipment manufacturing and repair facilities. Ms. Malaret has conducted multiple corridor assessments along roadways being prepared for expansion or improvements. She also conducted a Hazardous, Toxic, and Radioactive Waste Assessment for the United States Army Corps of Engineers on a 20-mile stretch of the St. Johns River in Jacksonville, Florida.



Bryan C. Yates, AICP, CEM, CPESC, LEED GA, QSD

Environmental Specialist

Mr. Yates has managed projects in both California and Nevada since 1998. His work encompasses a wide range of private and public developments that include: master-planned communities, residential subdivisions, schools, churches, commercial properties, infrastructure projects, and state, municipal and light industrial facilities. Mr. Yates’ experience includes Phase I Environmental Site Assessments, CalTrans ISA studies, Phase II site investigations, and remedial actions. Mr. Yates also has extensive background in construction and industrial stormwater permitting and compliance work. Through his planning background, Mr. Yates also brings a diverse understanding of the project planning/approval as well as the CEQA/NEPA documentation and project approval processes.

Mr. Yates projects experiences include large scale industrial complex evaluation and re-use projects, former Department of Defense sites proposed for re-use, and mitigation lands assessment. Mr. Yates has also completed work on complex infill and infrastructure rehabilitation projects. These projects were complicated since they were located adjacent to or within the boundaries of areas listed on the National Priorities List.



Joseph W. Rosenbery, PG, MS

Staff Geologist

Mr. Rosenbery received his Bachelor of Arts degree in Geology from California State University, Humboldt, and his Master of Science degree in Geology from California State University, Sacramento.

Mr. Rosenbery worked for the Geology Department at CSU, Sacramento for three years researching hyporheic conditions in salmon spawning habitat on the American and Feather Rivers. This research included developing field methods to characterize the environment in which Salmon spawning takes place. Mr. Rosenbery designed sample layouts, installed piezometers, collected water quality and physical attribute data, and designed experiments to accomplish the research goals. His master’s thesis worked to define the relationship between sediment permeability and the grain size distribution of river gravels in areas where habitat improvement projects have been implemented. This research added to the knowledge base used to identify the potential lifespan of gravel augmentations and helped drive the future design of habitat improvement projects in a dynamic natural environment.



Donald W. Updegraff

Senior Environmental Technician

Mr. Updegraff, an environmental consulting professional since 1987, has expertise in the protocols for field determination of toxic and hazard characteristics of unknown materials. He has served as the Radiation Safety Officer for use, maintenance and storage of nuclear density and moisture gauges used for geotechnical studies, and he has constructed, maintained and dismantled chemical remediation systems, including air sparge, air stripping, and carbon adsorption systems. He served for 20 years as a volunteer Emergency Medical Technician with the Clarksburg Fire District, where he has risen to the rank of Lieutenant and District Training Officer.

Experienced in collection of soil vapor and subslab samples at sites contaminated by volatile organic compounds, Mr. Updegraff is skilled in the field use of monitoring equipment including photoionization detectors (PID), flame ionization detectors (FID), water quality instruments, and explosive atmosphere (LEL) and oxygen sensors. He has been called upon to characterize contents of drums uncovered by grading at an active Army depot, and to supervise installation and removal of petroleum hydrocarbon product underground storage tanks, as well as remediation by excavation and offsite disposal. He is certified in hazardous waste operations and emergency response (HAZWOPER), Confined Space Entry, Lockout Tagout procedures and High/Low Angle Rescue Methods.