Optimal’s team has strong leadership is mobile, responsive, talented and enjoys a collaborative culture. Our flexible workforce is supported by key sub-consultants, suppliers and dedicated sub-contractors with like goals for our industry.

Murray Powell

Murray Powell

Managing Director Principal Auditor
Ben Wolfgramm

Ben Wolfgramm

Business Development & Projects
Dr. Guy Amos

Dr. Guy Amos

Civil, Environmental & Waterways Engineer & QA Manager
Hugh Williamson

Hugh Williamson

Design Manager & Construction Manager
Darren Hanley

Darren Hanley

Construction Supervisor
Sujana Bajracharya

Sujana Bajracharya

Drafting & Documentation Manager
Dihn Tran

Dihn Tran

Senior Design Drafting
Omid Sayar

Omid Sayar

Manager - Process & Operation Engineering
Sash Nasiri

Sash Nasiri

Senior Electrical & Automation Engineer
Oscar Bentham

Oscar Bentham

Civil & Environmental Engineer
Daniel Rhodes

Daniel Rhodes

Civil & Water Engineer
Ali Rasti Lari

Ali Rasti Lari

Civil Engineer
Hamid Mehrazmay

Hamid Mehrazmay

Process & Operations Engineer
Saeed Javan

Saeed Javan

Process & Operations Engineer
Arman Rashidi

Arman Rashidi

Process & Operations Engineer
Arash Sajedi

Arash Sajedi

Mechanical Engineer
Steve Darwent

Steve Darwent

Manager Victoria / South Australia
Mahnoush Najmi

Mahnoush Najmi

Process & Operations Engineer
Vahid Golkarian

Vahid Golkarian

Electrical Service Engineer
Farzad Pouralinazar

Farzad Pouralinazar

Process and Operation Engineer
Murray Powell
Murray Powell
Managing Director Principal Auditor

Bachelor of Chemical Engineering & Masters in Business Administration

Murray has dedicated his career to the advancement of the stormwater industry. Murray has a deep commitment to protection of the environment and his passion for improved stormwater management is relentless.

Murray spent his early career with the NSW EPA as a stormwater compliance officer auditing industrial facilities. Following this he joined CDS Technologies as business development manager. This role provided Murray with a platform to embark on an outstanding career in the industry. Following transitional roles with Rocla Pipeline Products and consultants Hugh Trumen Murray was invited to form Optimal Stormwater in 2009.

Murray has skills and experience in all facets of stormwater management, with specialist expertise in stormwater treatment, auditing and stormwater harvesting. He has been involved with the sizing, siting and design of almost thousands of GPTs both locally and internationally. He has developed new models of gross pollution traps, trash racks and stormwater harvesting off takes.

He has mentored practitioners and designers internationally in all aspects of GPT design, and has a comprehensive knowledge of all GPTs available in Australia. He has written GPT design guidelines for several Councils, and presented several technical papers on multiple aspects of stormwater treatment.

Murray has been involved in over 40 stormwater harvesting systems, including investigations, feasibility studies, concept design and detail design, to construction and also operation.

Ben Wolfgramm
Ben Wolfgramm
Business Development & Projects

Ben has over 20 years of experience in the stormwater industry. Ben joined Optimal in January 2015 after 6.5 years with Storm Consulting and prior to that 6 years with CDS Technologies and Rocla Pipeline Products. Ben is an accomplished water and urban stormwater practitioner and has lead iconic WSUD strategies for projects such as Barangaroo, Sydney Olympic Park and Green Square.

Ben has delivered numerous waterway restoration projects, master plans, pond and wetlands, gross pollution traps, flood studies and stormwater harvesting. Ben is a highly capable design and project manager with excellent communication and negotiation skills. Ben continues to contribute to the stormwater industry through the Stormwater Industry Association.

Dr. Guy Amos
Dr. Guy Amos
Civil, Environmental & Waterways Engineer & QA Manager

BE Civil & MS Environmental Engineering. PhD Water Resources Management

Guy is new to Optimal Stormwater, joining in April 2016 after 15 years in local government where he was Stormwater & Waterways Manager for the southern Sydney suburb of Sutherland Shire, the second largest council in NSW.

Under his direction his team was responsible for delivering stormwater management services, which included: new capital works; maintenance; forward planning; asset management; floodplain/estuary management; watercourse management; policy development and customer service.

As manager, Guy constructed a large number of varied stormwater quality improvement projects and was responsible for managing almost 300 across the Shire. Guy brings a wealth of skill and knowledge in working with local government, understanding the policies and practices. His expertise in project management enable him to coordinate and deliver sustainable solutions to the client on-time and within budget.

Guy originally from the United States earned his BE and MS, before coming to Australia in early 1990s. He completed a doctorate under Professor John Argue of the Urban Water Resources Centre, University of South Australia. Guy developed a ‘best practice’ water management strategy for Portland Aluminium (ALCOA), VIC, which at the time was the single largest earner of export dollars in Australia.

Hugh Williamson
Hugh Williamson
Design Manager & Construction Manager

Hugh is a diligent and passionate environmental engineer and enjoys working on projects with positive environmental and sustainability outcomes. He is dedicated to delivery of high quality design and construction. Hugh has excellent communication with clients and provides clients the best service.

Hugh is competent with all modelling tools including MUSIC, DRAINS, HECRAS, TuFlow and drafting in CAD.

Hugh graduated in 2011 from RMIT University in environmental engineering and worked at Melbourne Water as project & investigation engineer in the flood mapping and mitigation and land development teams from 2011 to 2013.

He has previously worked in local government in the capital works and assets planning investigations director of engineering for Ernest landscaping based in Melbourne’s western suburbs.

Hugh has published 3 papers on the topic of ‘stream daylighting’ and 1 paper on stormwater harvesting design in Wonthaggi for a combined Optimal Stormwater & Bass Coast Shire Council Project.

Darren Hanley
Darren Hanley
Construction Supervisor
Sujana Bajracharya
Sujana Bajracharya
Drafting & Documentation Manager

Diploma of Civil Engineering Masters of Professional Accounting

Sujana is a credit to the Optimal team and has been working as a civil, structural and water drafter for 10 years and as a drafting manager for 5 years. She has worked on large hydropower plants in Nepal, small, medium and large scale architectural projects in Sydney and gross pollutant traps for Rocla all over Australia.

Sujana previously undertook the design and drafting of stormwater quality treatment devices and her initials are still on the Rocla standard drawings. She has significant experience in using AutoCAD, Revit and Microsoft excel. She has meticulous attention to detail and is a very welcome and excellent addition to the Optimal Stormwater team. Sujana is competent in DRAINS, CAD, HECRAS

Dihn Tran
Dihn Tran
Senior Design Drafting

Dihn is Optimal Stormwater’s senior civil design drafter. Dihn has excellent skills and has prepared documentation for stormwater quality treatment devices, stormwater harvesting designs, potable water mains, sewer reticulation mains and civil works. He is an excellent worker in the Optimal Stormwater drafting team and is now picking up design elements.

Omid Sayar
Omid Sayar
Manager - Process & Operation Engineering

Bachelor of Chemical & Process Engineering.

Master’s in Environmental Engineering (Water, Wastewater and Waste Engineering) at UNSW

Master’s in Engineering Management (Waste and Pollution Management) at UTS

Omid is Optimal Stormwater’s process & operations engineering manager with +10 years invaluable process and treatment expertise in all aspects of wastewater and stormwater. He has undertaken several optimisation studies of stormwater & wastewater treatment plants in Australia, and working as the operations engineer and facing operational problems has provided Omid with the skills and knowledge not only to fix and optimise the process but also to avoid issues on design side of the new projects.

He has a combination of academic qualifications, (an engineering degree and two Masters degrees), solid communication skills, and real field experience. This has led to considerable operational management skills. Omid has the aptitude for practical designs, validation, and effective optimisation of waste treatment and stormwater treatment systems. Omid’s skills dovetail through his incredible understanding of all things water quality, mechanical, electrical and process. He will not only manage this project but provide trouble shooting advice on-the-spot to enhance each system’s performance. Beyond that he can scope the process needs of any future optimisation and work-forward plan. Omid is a Part-time Industrial University Lecturer at UTS for decentralised environmental systems. He is the SWH consultant for the ACT Government and is highly regarded around the stormwater industry, having presented several papers on stormwater harvesting.

Omid leads a team of engineers and technicians that operate well over 100 sustainable water projects for many Council’s in NSW, ACT and Victoria. He is passionate about saving water and producing reliable and practical schemes for our clients.

Sash Nasiri
Sash Nasiri
Senior Electrical & Automation Engineer

Sash is a dynamic & experienced Field Service Engineer with more than 10 years valuable experience gained from various industrial fields such as oil refineries and water & wastewater treatment plants. He is specialized in troubleshooting, preventative maintenance scheduling and implementing, D&C, testing and commissioning of various industrial equipment. Sash has outstanding control experience in PLC, HMI and SCADA programming.

Oscar Bentham
Oscar Bentham
Civil & Environmental Engineer
Daniel Rhodes
Daniel Rhodes
Civil & Water Engineer

Bachelor of Civil Engineering

Dan joined Optimal Stormwater as a Civil/Water Engineer in 2018. Since his commencement he has been working on watermain design and project management including overseeing drainage construction works on behalf of different Councils around Sydney.

Dan has also done extensive work with GPTs with Willoughby, SOPA and Randwick Council including design, auditing and rectifications of their existing devices. Most recently, Dan has been managing and producing on the Canberra GPT Audit, with excellent outcomes.

Dan is a passionate stormwater engineer with excellent communication skills who is not afraid to get his hands dirty in the field. This combined with great engineering knowledge makes him a valuable asset to the Optimal team. Dan is also lightning fast on a computer and a whiz with spreadsheets and information management.

Ali Rasti Lari
Ali Rasti Lari
Civil Engineer
Hamid Mehrazmay
Hamid Mehrazmay
Process & Operations Engineer

Bachelor of Environmental Engineering – Water and Wastewater treatment
Graduate certificate – Work Health and Safety

Hamid is our process and environmental engineer with +5 years experience in process optimisation and operation of wastewater treatment systems. He started his carrier as a service technician and is working his way up through the industry to become an operation engineer. He has a solid understanding about biological processes and operational requirements of treatment systems and has been involved with feasibility studies, plus design and operation of multiple stormwater and leachate treatment systems, including Shellharbour, Hurstville and St. Ives.

Saeed Javan
Saeed Javan
Process & Operations Engineer

Bachelor of Chemical Engineering
Masters of Chemical Engineering

Saeed is Optimal’s Process and Operations Engineer. He reports to Omid and heads the operation and service team for Randwick Council, City of Sydney, and North Turramurra Sewer Mining infrastructures. He has prepared the Water Infrastructure Operation Plans for many water recycling schemes such as Coogee SWH, Maroubra water recycling, and Sydney Water SWH pump stations. He also has a comprehensive understanding of pre-treatment and GPT operational requirements.

Saeed has an extensive process engineering background in operation of critical systems in the oil and gas industry. This provides him a comprehensive understanding of WHSE requirements for operation of complicated schemes. He’s loving being in the Water industry now, and protecting our valuable water resources in Sydney.

Saeed has a Master’s in chemical engineering, specialising in water recycling systems. His extensive process engineering knowledge was most recently utilised in designing and developing HAZOPs of a 1 ML/d SWH system for Ginninderry in the ACT.

Saeed also has excellent communication skills, and a really strong work ethic. It didn’t take long for him to become part of the senior team at Optimal.

Arman Rashidi
Arman Rashidi
Process & Operations Engineer

Bachelor of Chemical Engineering
Masters of Chemical Engineering

Arman is a senior process and operations engineer with more than 15 years’ experience in the process engineering field. He is the lead process engineer for our wastewater treatment and recycling projects. Arman has worked on many chemical process plants in Australia and oversees and is experienced in leading process engineering teams and delivering high end process design solutions.

Arman has an in depth understanding of water and wastewater treatment and the water recycling guidelines in Australia. He has developed many asset management plans for complicated systems in Australia. He is the lead process engineer for the Angus Creek SWH at Blacktown, INRN, North Sydney Council SWH, Parramatta SWH, and Ku-ring-gai Council water recycling systems. Arman can advise on appropriate treatment methods to achieve the required outcomes and to protect public and environmental health.

Arman developed auditing, validation and rectification plans for City of Ryde and Blacktown City Councils. His capabilities in water and wastewater asset condition and performance assessment plays an invaluable role in the project delivery.

Arash Sajedi
Arash Sajedi
Mechanical Engineer

Bachelor of Engineering Science,

Arash is our Mechanical Engineer with more than 15 years of experience in commissioning and operation of large fixed and rotary equipment units in refineries and large water and wastewater treatment facilities. He has got thorough knowledge of routine operation and maintenance of treatment equipment and has successfully serviced and maintained a wide range of equipment and instruments such as pumps, turbines, compressors, aerators, media filters, membrane, and water quality monitoring stations.

Arash has completed extensive safety courses and will be responsible for organising and supervising the maintenance works. He is the work supervisor for Parramatta, Mosman, and Georges River Councils. Arash communicates with Saeed and Sam for the operation and maintenance works.
Arash has been with Optimal for a couple of years now, and is a “still waters run deep” king of guy. He puts his mind to something and only comes up for air when he has the answer. He’s a solid and reliable member of the team that regularly exceeds expectations.

Arash has been with Optimal for a couple of years now, and is a “still waters run deep” king of guy. He puts his mind to something and only comes up for air when he has the answer. He’s a solid and reliable member of the team that regularly exceeds expectations.

Steve Darwent
Steve Darwent
Manager Victoria / South Australia
Mahnoush Najmi
Mahnoush Najmi
Process & Operations Engineer

Mahnoush is a driven qualified process and operations engineer who works in the Optimal Melbourne office. She has been working on auditing, troubleshooting, and optimization of stormwater treatment and harvesting schemes. Her passion for moving toward a safer and more sustainable future perfectly matches the core mission at Optimal Stormwater and the combination of her technical skills, knowledge and her strong communication abilities makes her a valuable asset for the team.
Since her commencement with Optimal, she delivered design, risk assessment, operation monitoring, and water quality analysis for medium to large scale schemes in Victoria.

Vahid Golkarian
Vahid Golkarian
Electrical Service Engineer

Bachelor in Electrical Engineering

Vahid is an electrical service engineer with extensive experience in electrical equipment design, build it, and maintenance of it. His knowledge and capabilities in electrical equipment and service works contributes to efficient delivery of the preventative and reactive maintenance on the equipment and instruments.

Vahid will be assisting Richard in the equipment maintenance and service works. He is very talented at actually constructing entire process control cabinets from scratch, and trouble shooting them in the field if required.

Farzad Pouralinazar
Farzad Pouralinazar
Process and Operation Engineer

Bachelor of Chemical Engineering
Masters of Chemical Engineering – from Sydney University

Farzad is a process and operation engineer with 4 years of experience in manufacturing process control. He has worked as an operator in Victoria and NSW on chemical processing plants.

Farzad works in Saeed’s team and assists him with delivery of operation and maintenance for many Councils around Sydney. Farzad will be assisting Hamid for the project delivery and remote monitoring of the system.