Senior Project Manager

• May 2023 - Present

Senior Manager II

• Apr 2022 - May 2023

Principal Geologist and Central PA Regional Manager

• Nov 2017 - Apr 2022

Geologic Services Director

• Nov 2014 - Nov 2017

Mr. Treschow serves as Geologic Services Director. Lehman offers a broad range of environmental services for industrial, commercial, and residential clients with a focus on the petroleum services industry. We pride ourselves on providing hands-on customer service and have built a reputation of trust with our long-term clients. Some of our most recent projects have involved waste characterization and disposal, indoor air sampling/reporting, NPDES sampling/reporting, Phase I & II environmental site assessments, asbestos building inspections, PA Act 2 site-specific closures with risk assessments, remedial system installations, and multiple awards of USTIF fixed price remediation contracts. Show less

Senior Project/Office Manager & Health and Safety Officer

• Oct 2011 - Nov 2014

Mr. Treschow serves as a Senior Project Manager as well as managing the Bellefonte, PA office of Letterle. Letterle's Bellefonte, PA office offers a broad range of environmental services for industrial, commercial, and residential clients with a focus on the petroleum services industry. We pride ourselves on providing hands-on customer service and have built a reputation of trust with our long-term clients. Some of our most recent projects have involved waste characterization and disposal, indoor air sampling/reporting, NPDES sampling/reporting, Phase I & II environmental site assessments, asbestos building inspections, PA Act 2 site-specific closures with risk assessments, remedial system installations, and multiple awards of USTIF fixed price remediation contracts. Show less

Operations Manager

• Dec 2007 - Oct 2011

As a Professional Geologist, I was responsible for the technical and managerial aspects of characterizing and remediating numerous sites impacted by the release of petroleum hydrocarbons as a result of leaking underground storage tanks. My current responsibilities include technical review of all final reports, evaluating and revising company procedures/policies, and review of all proposals. My project work includes the supervision of interim remedial actions, proposal/budget preparation, initial site characterization of all impacted site media, communication with the Pennsylvania Department of Environmental Protection, report writing, evaluation of remedial alternatives, remedial implementation, final report preparation/submission, and obtaining relief of liability for the client. My office duties also included supervision and training of staff and project level personnel, scheduling and coordination of field activities, data management, development of quality assurance/quality control procedures, preparation of site-specific health and safety plans, client communication, and development of reporting procedures. My field duties included soil boring advancement/sampling, groundwater monitoring well installation and sampling, soil gas sampling point installation, and aquifer slug testing. Additional project work included phase I Environmental Site Assessments (ESAs) and computer aided drafting. Show less

Senior Geologist

• Jan 2005 - Nov 2007

As a Professional Geologist, the position involved technical and managerial aspects of characterizing and remediating numerous sites impacted by the release of petroleum hydrocarbons as a result of leaking underground storage tanks. My project work included the supervision of interim remedial actions, proposal/budget preparation, initial site characterization of all impacted site media, communication with the Pennsylvania Department of Environmental Protection, report writing, evaluation of remedial alternatives, remedial implementation, final report preparation/submission, and obtaining relief of liability for the client. My office duties also included supervision and training of staff and project level personnel, scheduling and coordination of field activities, data management, development of quality assurance/quality control procedures, preparation of site-specific health and safety plans, client communication, and development of reporting procedures. My field duties included soil boring advancement/sampling, groundwater monitoring well installation and sampling, soil gas sampling point installation, and aquifer slug testing. Additional project work included phase I ESAs and computer aided drafting. Show less

Project Geoscientist

• May 2003 - Jan 2005

Position involved performing field and office work associated with geotechnical soil evaluations and evaluations for potential strip mining of bituminous coal. My project work focused on the Small Operators Assistance Program (SOAP) and the geologic requirements for permitting the surface mining of bituminous coal. I reviewed regional geologic and hydrogeologic reports, gathered all site specific subsurface information, collected water quality data for existing groundwater discharges, suggested proposed mining alternatives, and wrote the pertinent sections of the surface mine permits. Show less

Project Professional

• May 2002 - May 2003

Position involved performing field and office work associated with watershed assessments for acid mine drainage contamination and treatment hydrogeologic site assessments, mining and mineral resource investigations, slope failure and soil strength analysis, geochemical water analysis, and water resources analysis. I was responsible for all aspects of watershed assessments including proposal writing, budgeting, collection and analysis of pertinent historic information such as historical mine mapping, historical mine workings/permitted areas, abandoned mine workings, related regional reclamation projects, surface hydrology, subsurface hydrogeology, water quality data, discharge measurements, historical meteorological data, gathering digital mapping data, locating new discharges, locating crop fall locations and other existing mine features, measuring water quality parameters, making recommendations concerning proposed passive treatment alternatives, and final report writing. Show less

Project Geoscientist

• Jul 2000 - Aug 2001

Position involved performing field and office work associated with phase I and II site investigation in Ohio, Pennsylvania, and West Virginia. Specifically, my project work included remedial system design and installation, landfill gas migration studies, hydrogeologic testing, phase I site assessments, and waste characterization/removal as part of Pennsylvania Act II compliance work. My main responsibilities included supervision\logging of drilling activities (hollow stem auger, Geoprobe©, and Sonic drilling). The purpose of the drilling was to install groundwater monitoring points, groundwater recovery points, install gas monitoring points, further delineate areas of contamination, collect soil samples, and classify the underlying soil/rock. Additional responsibilities included training, educating, and supervising staff level geoscientists. Show less

Assistant Project Geoscientist

• Dec 1998 - Jul 2000

Position involved performing field and office work associated with phase I and II environmental site investigations and remedial evaluations in New Jersey, Pennsylvania, and Virginia. My main responsibilities included supervision\logging of drilling activities (hollow stem auger, air rotary, mud rotary, Geoprobe©, and NQ wireline rock coring). The purpose of the drilling was to install groundwater monitoring points, groundwater recovery points, collect soil samples, and classify the underlying soil/rock. A majority of my work focused on the Natural Attenuation of Chlorinated Solvents in groundwater. Based upon sample results, I would evaluate the potential for natural attenuation using several methods including Bioscreen© and the United States Environmental Protection Agency’s (US EPA) Bioplume III natural attenuation software. Another purpose of the drilling was to gather borehole geophysical information such as temperature, conductivity, single-point resistivity, gamma, flow (impeller flow meter), and acoustic-televiewer to determine water inflow, stratigraphy, marker beds, and chemical differences in the formation groundwater. The geophysical information was evaluated and utilized to determine well screen intervals, stratigraphic location, the potential presence of contamination in the groundwater, and to determine zones of groundwater production. Show less

Geoscientist

• Feb 1998 - Dec 1998

Position involved performing field work associated with geologic and hydrogeologic site investigations throughout Ohio, Illinois, Georgia, and Pennsylvania. My project work included phase I and II environmental site assessments (mostly solid waste landfills), site decommissioning, water production/resource evaluations, hydrogeologic testing for Pennsylvania Act II compliance, and evaluation of acid mine drainage impacted streams. My project work required me to plan/conduct field investigation programs, construct boring logs, write sections of geologic reports, interpret aerial photography, evaluate geochemical data, make recommendation based upon geochemical analysis, design, monitor, and analyze hydrogeologic testing programs, analyze groundwater flow systems, design wells and drilling programs, and evaluate groundwater resources. My main responsibility was the oversight\logging of hollow stem auger rigs. The purpose of the drilling activities was to characterize the underlying soil/rock and to install groundwater monitoring wells. The united soil classification system (USCS) was used to log the borehole and to construct boring logs. I designed, implemented, and analyzed a step-draw-down and constant rate pumping test for a bottled water facility to determine the nature, source, and available volume of water and to establish the interconnection of on-site spring/supply wells for a bottled water facility. I also conducted rising and falling head slug tests to determine hydraulic conductivity in a gravel aquifer as part of a Pennsylvania Act II investigation. I interpreted well log data and developed geologic maps, cross sections, fence diagrams, isopach maps, structure contour maps, and potentiometric surface maps to predict groundwater flow and movement. Show less

Soils Technician

• May 1997 - Feb 1998

Position involved the laboratory testing of soil samples for geotechnical design purposes. As a Soils Technician I performed classification, compaction, strength, consolidation, and permeability testing as well as digging test pits and collecting soil samples. The majority of my work focused on compaction and classification testing for solid waste municipal landfills. This experience gave me a more thorough understanding of soils mechanics and common geotechnical testing procedures utilized in the consulting industry. Show less

Geoscientist

• May 1995 - Feb 1998

As a staff geoscientist, the position involved performing field work associated with slope stability and landslide analysis, erosion and sedimentation control, investigation for foundation design, mine subsidence studies, geophysical surveys, and phase I environmental site assessments. My main responsibility was the oversight/logging of hollow stem auger drill rigs. Sampling was conducted using the standard penetration test with a 2-inch diameter split barrel sampler and 140 lb. Hammer. The purpose of the drilling activities was to characterize the underlying soil/rock, and to collect samples of the site soil for geotechnical analysis. The USCS classification system was utilized for logging and boring log construction purposes. Boring logs were then used to construct cross-sections, fence diagrams, and bedrock contour maps. Soil samples were collected, described (soil density/consistency, color, secondary soil type, primary soil type, and moisture) and laboratory tested for soil classification (grain size distribution), permeability, consolidation, and compaction properties. I then evaluated the test results for geotechnical design purposes and assisted the senior engineer in conceptual site design. Show less