![](https://gssiwater.com/wp-content/uploads/2022/10/history-image-2.png)
1965-70
Dr. Williams is awarded a PhD in groundwater hydrology and joins LADWP
• Developed an electrohydraulic arch tool to clear clogged artesian wells
• Developed shape charge explosive device to lower into basaltic aquifer wells to improve water production.
![](https://gssiwater.com/wp-content/uploads/2022/11/Dennis-Williams-artesian-Well.jpg)
1970-78
Dr. Williams returns to consulting, with stints in Iran, India and with the UN Development Program
• Developed First Seawater Intrusion Barrier in Middle East in conjunction with friend and colleague Neil Cline, Former GM of OCWD and SAWPA
• Gorgon Project –150 deep-water supply wells with Joe Sovella, former GM of Laguna Beach WD
• First Use of SCADA systems for Remote Monitoring and Management of Wellfields along Caspian Sea
![](https://gssiwater.com/wp-content/uploads/2022/11/444095390-50840015.jpg)
1978
Geoscience Support Services is incorporated
![](https://gssiwater.com/wp-content/uploads/2022/11/GSS-Mainframe-Computer-Digital-Groundwater-70k.jpg)
1979
Geoscience develops current aquifer zone testing methods
• Screens groundwater quality prior to Well construction
• Current best practice used industry-wide
![](https://gssiwater.com/wp-content/uploads/2022/11/full-scale-well-model.jpg)
1980
Design of the world’s largest aquifer model in collaboration with Roscoe Moss Company
• Full scale well model used to develop current best design practices for water well screen and filter pack
![digital groundwater model](https://gssiwater.com/wp-content/uploads/2022/11/50840023-scaled.jpg)
1981
First modern digital computer groundwater models
• Groundwater computer modeling code developed for Orange County Water District Seawater Intrusion Barrier and Rancho California Water District
![](https://gssiwater.com/wp-content/uploads/2022/11/Rancho-California-WD-map.jpg)
1981
First groundwater audit completed for Rancho California Water District. Sets paradigm for contents of the Sustainable Groundwater Management Act of 2014
![](https://gssiwater.com/wp-content/uploads/2022/11/Modern-Techniques-in-Well-Design.png)
1985
Publication of Modern Techniques in Water Well Design
• Established Well and Filter Pack design, which is current best practice
• Serves as basis for current Well Design Standards adopted by AWWA
![](https://gssiwater.com/wp-content/uploads/2022/11/Layer-1-1.jpg)
1988
Supported Brazilian oil company Brasoil in litigation against the Government of Libya
• Centered on Great Manmade River Project involving more than 700 wells that failed due to faulty design
• Settled by International Arbitration
![](https://gssiwater.com/wp-content/uploads/2022/11/444104061-diamond-valley-lake.jpg)
1994
Diamond Valley Lake Recovery Well project
• Lead groundwater hydrology firm for project
![](https://gssiwater.com/wp-content/uploads/2022/11/444126091-image.png)
1995
Collaboration with the USGS to review first integrated groundwater models and code
• Geoscience partners with USGS to review new Modeling Code
• First USGS Integrated Surface Water and Groundwater Model
![GSSI Hard hat](https://gssiwater.com/wp-content/uploads/2022/11/GSSI-HardHat_Corrected-scaled.jpg)
1999
Antelope Valley Adjudication begins
• Development of groundwater model
![](https://gssiwater.com/wp-content/uploads/2022/11/444127567-gssi_doheny-30-aug-16-presentation_page_29_image_0001.jpg)
2005
Development of Slant Well technology for seawater desalination intakes
• Current best practice for seawater intakes in California
![Slant well](https://gssiwater.com/wp-content/uploads/2022/11/Picture23.jpg)
2007
First Slant Well completed
![](https://gssiwater.com/wp-content/uploads/2022/11/444102686-chris-in-jordan_denniswilliams.jpg)
2015
Supported litigation between Disi Water Company and the Government of Jordan
![](https://gssiwater.com/wp-content/uploads/2022/11/1280px-Rosamond.jpeg)
2015
Antelope Valley adjudication finalized
![](https://gssiwater.com/wp-content/uploads/2022/11/Santa_Ana_River.jpeg)
2016
Begin development of largest integrated groundwater model in California
• Incorporates 5 groundwater basins in Santa Ana River watershed
• Used as project planning and permitting tool by multiple agencies
![](https://gssiwater.com/wp-content/uploads/2022/11/Remote-monitoring-skid-crop.jpg)
2018
Develop remote instrumentation for well construction management
![](https://gssiwater.com/wp-content/uploads/2022/11/Monterey-1-1.jpg)