Las Vegas, NV

David Frohnen, PE President


Mr. Frohnen serves as the Chief Operating Officer and Chief Executive Officer for the corporation.  His focus is as the principal technical consultant, client solution maker, leader for client services, and oversees service delivery for customers in laboratory testing and equipment / field support.  Dave puts special attention to building teams and systems and providing added value to clients – particularly on new programs and special requests.  Frohnen has over 25 years experience in environmental and industrial testing, regulation and engineering.  Dave is a former water utility executive with laboratory, operations, engineering, and regulatory compliance responsibilities.  Mr. Frohnen served as an environmental Program Manager in heavy industry and as the Managing Principal for an international consulting engineering firm.  He holds degrees in civil / environmental engineering and an MBA with specialized training in quality, business operations, and customer service systems.  Dave is a licensed professional engineer in 5 western states, former licensed water operator and is a Past President of the American Council of Engineering Companies of Nevada.  He has spent his entire life in the western United States where he enjoys hiking, skiing, and various outdoor adventures.

Melissa Vega Las Vegas Client Services Manager


Ms. Vega is your key point of contact for client account management, customer service, order processing, project status, reporting requests and basic report interpretations.  Similarly, her responsibilities include guiding the customer service functions for the laboratory, coordinating and scheduling sampling events, pick-ups and deliveries and supervising the field service operations.  Vega has over 30 year’s experience in office management, project management, customer service, inside sales, order processing and accounting.  Melissa has lived in Las Vegas for over 25 years, has served in the U.S. Army Reserves and is an avid football fan.

John Sloan Las Vegas Laboratory Technical Director


Mr. Sloan is responsible for ensuring that testing systems in the laboratory provide quality data and services for clients.  Similarly, he is responsible for the overall operation and administration of the laboratory, including the employment of competent and qualified laboratory personnel and new method development.  Sloan has over 15 years experience in analytical chemistry with a focus on EPA and ASTM methods.  John earned a Bachelor of Science in Biochemistry from the University of Nevada and has completed master’s level course work.  Mr. Sloan has worked at Silver State Analytical Laboratories for over 10 years.  He was born and raised in Las Vegas and is proud to say he is a lifelong Nevada Resident.

Steve West Las Vegas Client Services Manager - Enviro-Tech Equipment Manager


Mr. West serves as your Client Services Manager for accounts near Las Vegas.  He also oversees the Enviro-Tech equipment services for rentals, sales, repairs and calibrations of all field equipment and supplies.  Steve also serves as your outside sales contact and will assist with field services as needed.  He has worked at Silver State Analytical since 2006 starting as a driver and progressing through several laboratory assignments.   He has a wide scope of industry knowledge including advanced training in support of Enviro-Tech products including pumps, samplers, test equipment, PID’s and related products.  West attended Salt Lake Community College and Snow College as well as BYU-Idaho.  Steve is an avid car fan and, in his spare time, loves working on cars.  In fact, Steve has owned over 18 cars and trucks throughout his life.  Mr. West is your key point of contact for new testing programs and  Enviro-Tech services in the Las Vegas area and company wide.

Reno, NV

Carly Wood Reno (SEM) Laboratory Director


Ms. Wood is the Reno Laboratory Director and Business Unit Leader for the Reno (SEM) Division.  She provides technical and operational leadership – supervises the lab team and manages daily operations.  She earned a Bachelor’s Degree in Chemistry, cum laude from Southern Oregon University and has over 8 years environmental laboratory experience.  Wood also has microbiology and wet chemistry analytical experience and worked as a technical specialist and a technical director.  In her spare time, Carly enjoys cats and reading.

John Faulstich Reno (SEM) Principal Chemist / QA Manager


Mr. Faulstich serves as the principal technical resource for the Reno Laboratory, which includes providing advanced analyses, new method development, instrument set up, maintenance and repair.  He also serves as the principal QC officer and Quality Program Director.  Faulstich received his Bachelor of Science degree in General Studies from the University of Nevada, Reno.  John has over 25 years environmental laboratory experience at many levels and with different labs, including work as an Inorganic Chemistry Supervisor, Chemist, QA Officer, Project Manager and Operations Manager.  In 2007, Mr. Faulstich joined the staff of Sierra Environmental Monitoring.  In his spare time, John enjoys construction, clay sports, kayaking, and hunting.

Joe Nava Reno (SEM) Client Services Manager


Mr. Nava is your key point of contact for client account management, customer service questions, order processing and reporting requests.  Similarly, he is the local point of contact for Enviro-Tech sales and rentals for the Reno area.  Nava has worked as a laboratory professional for over 20 years and held positions in client relations and as an Administrative Manager.  Joe has a Bachelor of Arts degree in Sociology from the California State University at Sacramento.  In 2004, Nava joined the staff of Sierra Environmental Monitoring.  Together, with his dogs and his wife, Joe enjoys many outdoor activities including hiking.

Elko, NV

Rena Jerome Client Services Representative - Elko Area


Since 2012, Mrs. Jerome has been responsible for the operation of our Elko Service Center.  This includes Enviro-Tech sales and rental, client services, sample pick up, shipping and receiving.  She was previously a business owner and worked as a bookkeeper and customer service representative. Jerome is a 1994 graduate of Kootenai, (ID) High School.  Rena moved to Nevada in 1996 with her husband who has been a long-time mining industry professional.

Sacramento, CA

Joseph Trapasso III Business Development and Client Services Manager - California


Mr. Trapasso’s responsibilities include Client Services – Project Management for all California based clients.  He also has statewide new business development and customer satisfaction responsibilities.  This dynamic position includes business development for the California market, direct sales, marketing, field sampling, client services.  Joe’s recent tenure includes 5 years with Enviro-Tech Services Company and 4 years with Silver State Analytical and Excelchem Laboratories, Inc.

Trapasso is an Army Veteran and, while he was stationed in Washington D.C. and Germany, gained experience in G.I.S. and Logistics.  Joe then discovered a keen interest in the Environmental Industry, where he’s worked now for over 10 years.  He previously performed field related activities for his first 5 years in the industry and managed an environmental equipment and supply company before joining Silver State Analytical.  Mr. Trapasso is an avid sports fan who loves to spend free time golfing, traveling, and learning photography.

JOSHUA COX, Ph.D. Sacramento Laboratory Director


Dr. Cox serves as the Sacramento Laboratory Director where his overall responsibilities include staffing, operations, and quality control to ensure our client projects are completed on-time, efficiently, and with high quality.  Josh also applies his technical knowledge to implement and troubleshoot new testing methods, maintain superior quality control systems and provide clients with expert technical consultations.  Josh earned his BS degree from UC Davis in biochemistry and his Ph.D. in pharmacology from UC San Francisco.  Josh has over 15 years for professional experience in science and environmental testing and is committed to working to advance a safe and healthy planet.

Josh enjoys his down time with music and adventure and has strong family ties to the Northern California region.

Jose Martinez Sacramento Laboratory Manager


Jose Martinez serves as laboratory manager, senior analyst and technical director for the Sacramento Laboratory.  This includes daily supervision of the analytical testing team members, work planning, and oversight of testing procedures, equipment maintenance and technical training.  Jose is an expert in VOC analyses with aqueous, soil and air samples.  He is the go-to team member for getting big tough projects done on-time and with quality results.  Jose holds chemistry/biochemistry degrees from UC Davis and began his laboratory career in 2010 – mastering various testing protocols and advancing rapidly.

Jose has strong family ties to the Sacramento region and enjoys all that the region has for cultural and outdoor adventures.

Rachele Lang Client Services Rep - Project Manager


Based in Sacramento – Ms. Lang started with Excelchem Laboratories, Inc. as sample custodian and LIMS operator in 2018.  With a BS degree in science from UC Santa Cruz and a strong work ethic, she quickly became a go-to project manager – coordinating client projects, managing lab schedules, and ensuring that reports get completed, reviewed and delivered on time.  Rachele was promoted to her current role in 2019 where she is the key point of contact for client service and project management.  She is a long time resident of Roseville, California and she continues her science education with on-line masters level coursework.

Anaheim, CA

Joseph Trapasso III Business Development and Client Services Manager - California


Mr. Trapasso’s responsibilities include Client Services – Project Management for all California based clients.  He also has statewide new business development and customer satisfaction responsibilities.  This dynamic position includes business development for the California market, direct sales, marketing, field sampling, client services.  Joe’s recent tenure includes 5 years with Enviro-Tech Services Company and 4 years with Silver State Analytical and Excelchem Laboratories, Inc.

Trapasso is an Army Veteran and, while he was stationed in Washington D.C. and Germany, gained experience in G.I.S. and Logistics.  Joe then discovered a keen interest in the Environmental Industry, where he’s worked now for over 10 years.  He previously performed field related activities for his first 5 years in the industry and managed an environmental equipment and supply company before joining Silver State Analytical.  Mr. Trapasso is an avid sports fan who loves to spend free time golfing, traveling, and learning photography.